Archive for the ‘ external link ’ Category

>Pipistrel 200 kts 4-seat hybrid aircraft

>Pipistrel is working on a new novel concept which would be a four seater and cruise 200 kts with relatively low power (200 kts at 160 hp). I have seen some references to it for quite some time now, but finally bumped into a blog post at Cafefoundation blog which includes also a rendering of the model:

Cafefoundation: Pipistrel hybrid

Looks pretty much like aerodynamically quite much cleaned up Diamond DA40 with some features somewhat resembling Nemesis NXT racer (e.g. the wing geometry) although with higher aspect ratio. I am confident that Pipistrel will succeed with this project and will show how the general aviation planes of tomorrow can be both efficient and fast and will not require many hundreds of horse power to be fast. I think this is one of the most interesting ones of the new production aircraft coming in sometime in the future.

The blog post says it is not a parallel hybrid, would that indicate then that it would be a series hybrid. It will be very interesting to see what will come up from this project. I will write more about it when I find more details.

UPDATE: Noticed from Cafefoundation page the bottom note; (Editor’s Note: Pipistrel will roll out the airplane in the new year, and will not allow disclosure of more than what has been shared here until then.) – this may mean that we don’t hear more about this aircraft before 2012.

UPDATE 2: The new year referred on the previous post was written 2010, so if we are lucky, we will see roll out of the craft this year 2011 then. Lets wait and see. I am sure it will have specifications that will make some jaws dropping. Will be very interesting.

PSRU for automotive engines

It seems that the usual condition for an aircraft PSRU is to fail. It appears to be difficult to design one (which is incredible, because similar speed reduction units are widely used in industry elsewhere and I am quite sure that there are established ways to design them properly).

I bumped into this manufacturer about which somebody flying a Ford engine was very happy about. So I decided to share the link if that interests you any.

http://www.alternate-airpower.com/

Not sure if the price-what you get ratio is anywhere one could call affordable (7500 per unit) taking in account that this is a chain drive unit rather than a sophisticated reduction gear. However, reportedly this works. And the web page says at the moment “PSRUs are temporarily unavailable “. Maybe this is temporary I hope.

Propeller design rethought

Most manufacturers design propellers in the same way and they read the old books and reports and the prop gets no more than 80-85% efficiency at best. It is written in books that propeller efficiency will be about that at best and it is left often open how low it can be at worst.

Here is an interesting article about a guy that made a prop that was 90 percent efficient by not abiding the “old truths” but thinking out of the box:

http://www.eaa.org/experimenter/articles/2009-02_elippse.asp

Having a strong taper certainly makes sense since the propeller tip travels very much faster than the root through the air. Also the old saying that single blade prop is most efficient does not make sense if you think it in detail: the air that enters in the next blade is not the same air that went through the previous blade because of the forward movement of the aircraft. This could be extrapolated in a such way, that the faster the aircraft travels, the more blades the propeller can have without sacrificing the propeller efficiency. This should not actually require very high mathematics, but I am quite sure that it could be estimated with simple calculations where the downwash of the previous blade goes in relation to the next blade on the speed range intended for the aircraft being designed.

High altitude propeller will require some additional thinking for the tip chord because the Reynolds number will become low if the chord is this short. The TAS is much higher at high altitude, therefore the air travels faster through the prop, that would mean that the prop could have more blades. The high altitude propeller does not require full efficiency at low altitude because to be able to operate at high altitude, there needs to be a lots of excess thrust available regardless.

Nice collection of tech papers (3LS and more)

Here is a yet another collection of tech papers, however, in this time in a quite hand-picked manner – those most interesting ones (Voyager liquid cooled engines, Rotary engines, three lifting surfaces papers etc.):

http://www.protonet.org/doc/

Go to get them, good stuff.

Rutan Proteus photo collection

NASA has nice photo collection. If you like the looks of the Proteus (in my opinion it is one of the most beautiful aircraft ever done), have a look:
http://www.dfrc.nasa.gov/gallery/photo/Proteus/index.html

SpaceShipTwo unveiled

Here is a great article with pictures and video:
http://news.bbc.co.uk/2/hi/science/nature/8400353.stm

Awesomely pretty machine. I would like to fly that thing (as a pilot rather than passenger).

MIT course materials online

I found this site quite interesting:
http://ocw.mit.edu/OcwWeb/web/courses/courses/index.htm#AeronauticsandAstronautics

MIT course lecture material online for everybody for free.

PRELIMINARY AERODYNAMIC DESIGN CONSIDERATIONS FOR ADVANCED LAMINAR FLOW AIRCRAFT CONFIGURATIONS

NASA TP PRELIMINARY AERODYNAMIC DESIGN CONSIDERATIONS FOR ADVANCED LAMINAR FLOW AIRCRAFT CONFIGURATIONS can be found from the following link. I found it quite interesting.

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19880014362_1988014362.pdf

Flap mechanisms for RC aircraft

http://www.nextcraft.com/highlift_rc_setups.html

Airfoil investigation database

Pretty neat airfoil database with search and quick illustration capabilities.

http://www.worldofkrauss.com/

Open source tools for CFD

http://www.geuz.org/gmsh/
http://www.opencfd.co.uk/openfoam/

Minimizing fuselage drag (external link)

Bruce Carmichael: Minimizing fuselage drag. http://www.aerorag.com/resource/aircraft/aerodynamics/carmichael/min_fus_drag_carmichael.pdf

Jet glider conceptual study (link)

http://www.google.fi/url?sa=t&source=web&ct=res&cd=6&url=http%3A%2F%2Fsalamanca.khbo.be%3A8080%2Fdoks%2Fdo%2Ffiles%2FFiSe8a81998218eeb4e50118ef3ae0650156%2Feindwerk.pdf%3Bjsessionid%3D5E70EC2B35D00A97C21355C91E39AFE5%3FrecordId%3DSKHB8a81998218eeb4e50118ef3ae0630155&ei=0tKfSpiOCoaQsAbvkPkc&usg=AFQjCNE_pm74spwMHweSYoUJ4k-GTc4ocw&sig2=hhrDwapR25sdgbscQ8vHPA

Hands on with the new amazing Nokia N900

There has bee a lots of interest around this new device and the Maemo 5 operating system. Lots of positive comments and then I have read some comments where people doubt that the transitions would be just some flash animations and not a real thing (which of course is not true). Well, this is a OpenGL hardware accelerated Maemo device, and all you see is real. Quim Gil just posted on Twitter a link to a new video showing how the Maemo UI works, if you had doubts, you can put the doubt aside and see by yourself. The user experience is slick and beautiful.

You can find the video from here:
http://www.youtube.com/watch?v=ZrYqemylpIo

In my opinion, the UI experience on the Maemo 5 has improved greatly over what it used to be and also over the competition. It is really pleasant to use and there are not so many things that would be annoying. There certainly is lots of wow, and this kind of shows the innovation these days is occuring in the mobile space rather than on desktop, desktop environments are already lagging behind and the transitions on these UIs are not so practical they are in Maemo where they are all well thought and well implemented and not just random eye candy and special FX without purpose. Maemo 5 really rocks on this segment.

There is also an article about hands on experience on N900. Slashgear is reporting from Nokia World conference. There is both video and lots of good pictures included. This shows how the device looks like rather than the UI. The video I mentioned above is better showing how the UI functions.

http://www.slashgear.com/nokia-n900-hands-on-0254743/

And here is yet another hands on video. This is also very good:
http://www.youtube.com/watch?v=Zr-BF0Gs0_E

And here is the replacement for a gaming console.

http://twitpic.com/g6smv

The Nokia N900 can be used as accelerometer equipped controller and connected to a TV. Hint for game developers: Here is the great platform to start developing games. The platform supports full OpenGL ES 2.0 and a OpenGL-ES game does not even need to care that much what Maemo version it will run on, Maemo 5, Maemo 6, and the GL is standard. It is not a bad long term investment to invest on Maemo. The N900 has a capable graphics accelerator (for this small mobile device) as can be seen from the Bounce game and from also the UI which heavily relies on the accelerated 3D graphics. The capacity of the device is great – it has plenty of RAM and there is plenty of flash too on the user’s home directory. And if the RAM would not be enough, there is also virtual memory like on any modern operating system nowadays. The games don’t need to be that simple and amateurish anymore “mobile games”, I am quite confident that anything that has been done for Wii could be done for this device, in other words, this could be used as a serious gaming device despite that is not what it was primarily targeted for (as it is Internet device really). But like computers, there are many uses for the single device. Also, the device can be always connected, so massive multiplayer games would be superb on this. Looking forward to try some serious 3rd party games in the future! Hey Austin, if you read this, please port the X-plane, I want it.

TMS turbo installation on Rotax 914

Here is an article about turbo system of the highly modified Rotax:

http://www.designnews.com/article/13660-Turbo_power_reaches_new_heights.php

Tractor vs. pusher

There is lots of strong feelings about tractor vs. pusher propeller configuration but no exact generic answer. Here is one article about the topic. Does not make definitive answer, but gives some background for the topic:

http://www.flyingmag.com/technicalities/1582/pusher-pusher.html

Here is another article:

http://dic.academic.ru/dic.nsf/enwiki/514042

Forum discussion

Another forum discussion

http://www.aiaa.org/content.cfm?pageid=406&gTable=mtgpaper&gID=50663

Tractor (prop forward of laminar flow wing):

http://www.aiaa.org/content.cfm?pageid=406&gTable=Paper&gID=1248

HECS part II

Aerodynamic Comparison of Hyper-Elliptic Cambered Span (HECS) Wings with Conventional Configurations

LINK: How to design blended wing body RC airplane

http://rcairplanedesign.googlepages.com/Design-BWB-Blended-Wing-Body-RCplane.htm

The mentioned AVL can be found from the following address:
http://web.mit.edu/drela/Public/web/avl/

Ducted fans

Inlet Channel for a Ducted Fan Propulsion System of a Light Aircraft – a 300 km/h ultralight aircraft with ducted fan propulsion is discussed

Common errors in ducted fan design
Performance Study of a Ducted Fan System

DFDC

Crescent-shaped wing

http://morphing.mae.cornell.edu/Papers/%5BManzo%5D%20HECS%20MS%20Thesis%20Master.pdf

http://www.aiaa.org/content.cfm?pageid=406&gTable=mtgpaper&gID=65912

Misc tech paper etc. link collection

I created a wiki page to katix gforge for link collection.

I hope you like it. It is not sorted in any sense, but it contains lots of interesting links. A friend of mine has been sending these to me a quite long time and I thought that I could share the collection with you.

http://gforge.katix.org/gf/project/twinzygger/wiki/?pagename=MiscTechPapers

>Misc tech paper etc. link collection

>I created a wiki page to katix gforge for link collection.

I hope you like it. It is not sorted in any sense, but it contains lots of interesting links. A friend of mine has been sending these to me a quite long time and I thought that I could share the collection with you.

http://gforge.katix.org/gf/project/twinzygger/wiki/?pagename=MiscTechPapers

>Rutan Ares

>Youtube video about Burt Rutan Ares

Rutan Ares

Youtube video about Burt Rutan Ares

>Wolfram

>Ever wanted a Star Trek’s computer? It is here today:

http://www.wolframalpha.com/

For starters, try out for example: integrate x+y^2
This service is superb.

Wolfram

Ever wanted a Star Trek’s computer? It is here today:

http://www.wolframalpha.com/

For starters, try out for example: integrate x+y^2
This service is superb.

>Interesting BWB links

>www.aoe.vt.edu/research/groups/bwb/papers/TheBWBAircraft.pdf
http://silentaircraft.org/object/download/1931/doc/AIAA-2006-241-725.pdf”>silentaircraft.org/object/download/1931/doc/AIAA-2006-241-725.pdf
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20050182126_2005180630.pdf”>ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20050182126_2005180630.pdf
http://www.onera.fr/daap/ailes-volantes/aerodynamic-optimization-of-subsonic-flying-wing-configurations.pdf”>www.onera.fr/daap/ailes-volantes/aerodynamic-optimization-of-subsonic-flying-wing-configurations.pdf
silentaircraft.org/object/download/1945/doc/AIAA-2007-453-759.pdf”>silentaircraft.org/object/download/1945/doc/AIAA-2007-453-759.pdf

Interesting BWB links

www.aoe.vt.edu/research/groups/bwb/papers/TheBWBAircraft.pdf
http://silentaircraft.org/object/download/1931/doc/AIAA-2006-241-725.pdf”>silentaircraft.org/object/download/1931/doc/AIAA-2006-241-725.pdf
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20050182126_2005180630.pdf”>ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20050182126_2005180630.pdf
http://www.onera.fr/daap/ailes-volantes/aerodynamic-optimization-of-subsonic-flying-wing-configurations.pdf”>www.onera.fr/daap/ailes-volantes/aerodynamic-optimization-of-subsonic-flying-wing-configurations.pdf
silentaircraft.org/object/download/1945/doc/AIAA-2007-453-759.pdf”>silentaircraft.org/object/download/1945/doc/AIAA-2007-453-759.pdf

Aircraft and airfoil design programs

This page contains a quite good list of aircraft design and airfoil programs

>Aircraft and airfoil design programs

>This page contains a quite good list of aircraft design and airfoil programs

Laminar flow

Design of Fuselage Shapes for Natural Laminar Flow

ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19900016623_1990016623.pdf

>Laminar flow

>Design of Fuselage Shapes for Natural Laminar Flow

ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19900016623_1990016623.pdf

Tractor propeller effect on wing behind the prop

http://adsabs.harvard.edu/abs/1987PhDT……..47H
ctn.cvut.cz/ap/download.php?id=178
http://yarchive.net/mil/laminar_flow.html
http://search.informit.com.au/documentSummary;dn=384807529637512;res=IELENG

>Tractor propeller effect on wing behind the prop

>http://adsabs.harvard.edu/abs/1987PhDT……..47H
ctn.cvut.cz/ap/download.php?id=178
http://yarchive.net/mil/laminar_flow.html
http://search.informit.com.au/documentSummary;dn=384807529637512;res=IELENG

Aeronautics Thesis Works from Finland

Couple of Finnish papers with aeronautics related topic

>Aeronautics Thesis Works from Finland

>Couple of Finnish papers with aeronautics related topic

Link: Wing tip devices

NONPLANAR WING CONCEPTS FOR INCREASED AIRCRAFT EFFICIENCY – http://aero.stanford.edu/Reports/VKI_nonplanar_Kroo.pdf

>Link: Wing tip devices

>NONPLANAR WING CONCEPTS FOR INCREASED AIRCRAFT EFFICIENCY – http://aero.stanford.edu/Reports/VKI_nonplanar_Kroo.pdf

Nextcraft

I found a quite interesting site:
http://www.nextcraft.com/
There was for example a 1/3 scale Berkut/Long-Ez project. 1/3 scale RC-model is said to be minimum sufficient for modeling the full scale aircraft, so I find this example quite educational. As can be seen though, the airfoils are different than on the full size plane. This is necessary because of the very low Re of the model. It does not thus model it very accurately, so there might be still surprises on the full scale version when scaling up, but I think it would still be good to do 1/3 models of new aircraft designs.

The direct link to the 1/3 scale Berkut can be found here: http://www.nextcraft.com/berkut01.html

>Nextcraft

>I found a quite interesting site:
http://www.nextcraft.com/
There was for example a 1/3 scale Berkut/Long-Ez project. 1/3 scale RC-model is said to be minimum sufficient for modeling the full scale aircraft, so I find this example quite educational. As can be seen though, the airfoils are different than on the full size plane. This is necessary because of the very low Re of the model. It does not thus model it very accurately, so there might be still surprises on the full scale version when scaling up, but I think it would still be good to do 1/3 models of new aircraft designs.

The direct link to the 1/3 scale Berkut can be found here: http://www.nextcraft.com/berkut01.html

Some links

Axial Flow Propulsor for Small Aircraft
Computational Fluid Dynamic Simulation (CFD) and Experimental Study on Wing-external Store Aerodynamic Interference

Design of Carbon Composite Driveshaft for Ultralight Aircraft Propulsion System

Flying Wings. A New Paradigm for Civil Aviation?
Rapid Prediction of Configuration Aerodynamics in the ConceptualDesign Phase
Design of a Three Surfaces R/C Aircraft Model
Response of a Light Aircraft Under Gust Loads
FEM MODELLING OF COMPOSITE STRUCTURES AND EXPERIMENTAL COMPARISON
www.vgtu.lt/english/editions/aviation/dokumentai/Nr_01.pdf

>Some links

>Axial Flow Propulsor for Small Aircraft
Computational Fluid Dynamic Simulation (CFD) and Experimental Study on Wing-external Store Aerodynamic Interference

Design of Carbon Composite Driveshaft for Ultralight Aircraft Propulsion System

Flying Wings. A New Paradigm for Civil Aviation?
Rapid Prediction of Configuration Aerodynamics in the ConceptualDesign Phase
Design of a Three Surfaces R/C Aircraft Model
Response of a Light Aircraft Under Gust Loads
FEM MODELLING OF COMPOSITE STRUCTURES AND EXPERIMENTAL COMPARISON
www.vgtu.lt/english/editions/aviation/dokumentai/Nr_01.pdf

Interesting data about ultralight aircraft

I found interesting paper which tells some details about some ultralight aircraft, the better, even about the TL-96 Star we previously owned. I find it quite interesting.
http://ctn.cvut.cz/ap/download.php?id=77

>Interesting data about ultralight aircraft

>I found interesting paper which tells some details about some ultralight aircraft, the better, even about the TL-96 Star we previously owned. I find it quite interesting.
http://ctn.cvut.cz/ap/download.php?id=77

>Links

>Aerospaceweb’s Atmosphere calculator
MicroMAPS Team Spring 2005 Final Report AOE 4065
Predator fact sheet
NASA tech paper TM-1998-206636 – Propulsion System for Very High Altitude Subsonic Unmanned Aircraft
CReSIS UAV Critical Design Review: The Meridian
Wikipedia: Altus UAV
History of HALE aircraft

Links

Aerospaceweb’s Atmosphere calculator
MicroMAPS Team Spring 2005 Final Report AOE 4065
Predator fact sheet
NASA tech paper TM-1998-206636 – Propulsion System for Very High Altitude Subsonic Unmanned Aircraft
CReSIS UAV Critical Design Review: The Meridian
Wikipedia: Altus UAV
History of HALE aircraft

Link: High altitude still pictures (60000 ft up)

jcoxon77’s photostream, Flicr:
http://www.flickr.com/photos/jcoxon77/

They look pretty cool, don’t they?

But 76500 ft looks even cooler:

http://www.flickr.com/photos/nebarnix/sets/72157607393699828/

Interestingly though, 42000 ft still looks pretty amazing:

Link: High altitude still pictures (60000 ft up)

jcoxon77’s photostream, Flicr:
http://www.flickr.com/photos/jcoxon77/

They look pretty cool, don’t they?

But 76500 ft looks even cooler:

http://www.flickr.com/photos/nebarnix/sets/72157607393699828/

Interestingly though, 42000 ft still looks pretty amazing:

>Tecnam P2006T

>Here is a design paper about Tecnam P2006T. I find it quite interesting.
www.aidaa.it/3-2008/P2006_corr.pdf

Interesting detail with the used Rotax 912S is that it provides actually better thrust at takeoff and climb than same horse power with a Lycoming engine (because the engine nacelle has smaller frontal area and the propeller rotation speed is lower).

Tecnam P2006T

Here is a design paper about Tecnam P2006T. I find it quite interesting.
www.aidaa.it/3-2008/P2006_corr.pdf

Interesting detail with the used Rotax 912S is that it provides actually better thrust at takeoff and climb than same horse power with a Lycoming engine (because the engine nacelle has smaller frontal area and the propeller rotation speed is lower).

>Scaled Raptor UAV Rotax 912 modification

>I found an article about high altitude UAVs, and the Rotax 912 modification for Raptor UAV is mentioned here:
http://www.cre8tivenergy.com/uav.htm
(Quite interesting two stage turbo installation)

Scaled Raptor UAV Rotax 912 modification

I found an article about high altitude UAVs, and the Rotax 912 modification for Raptor UAV is mentioned here:
http://www.cre8tivenergy.com/uav.htm
(Quite interesting two stage turbo installation)

Eclipse ECJ

Here is Gizmag’s article about Eclipse EJC:

http://www.gizmag.com/go/7668/

Pictures on Airliners.net:

Airliners.net: Eclipse ECJ

>Eclipse ECJ

>Here is Gizmag’s article about Eclipse EJC:

http://www.gizmag.com/go/7668/

Pictures on Airliners.net:

Airliners.net: Eclipse ECJ

RC Advisor

Carlos from RCAdvisor commented my one post and I decided to check out his site. I created user account there etc. I was really amazed the RC Calculator, it not only has quite amazing features for model makers, but it also seems to have quite interesting animated UI, I didn’t know that this kind of stuff can be nowadays done with Java (or is it flash?). I haven’t had time to yet surf what all is on this site, but it looks quite comprehensive and promising and I will for sure look further into it. Indeed, maybe I find some tips for the twin concept RC-scale model I am going to do. Thanks Carlos for your link!

the link to the RCAdvisor

>RC Advisor

>Carlos from RCAdvisor commented my one post and I decided to check out his site. I created user account there etc. I was really amazed the RC Calculator, it not only has quite amazing features for model makers, but it also seems to have quite interesting animated UI, I didn’t know that this kind of stuff can be nowadays done with Java (or is it flash?). I haven’t had time to yet surf what all is on this site, but it looks quite comprehensive and promising and I will for sure look further into it. Indeed, maybe I find some tips for the twin concept RC-scale model I am going to do. Thanks Carlos for your link!

the link to the RCAdvisor

Pressure thrust and plasma drag reduction patent links

I find this quite interesting:

http://www.wipo.int/pctdb/en/wo.jsp?IA=US2005047133&wo=2006073954&DISPLAY=DESC

Here is another:

Plasma drag reduction

>Pressure thrust and plasma drag reduction patent links

>I find this quite interesting:

http://www.wipo.int/pctdb/en/wo.jsp?IA=US2005047133&wo=2006073954&DISPLAY=DESC

Here is another:

Plasma drag reduction

>A Lancair builder has collected a list of links to tech papers, e.g. NLF215F

>Link:

Interesting technical papers

There is link to the NLF215F airfoil tech paper. It was particularly interesting. Now I understood the philosophy of the profile – I was always wondering, why this profile has the low drag bucket at so high Cl (around 0.5) rather than what is realized in cruise with small aircraft (up to 0.2). But, it seems, that this airfoil is designed to be used with -10 degrees flaps. With those, the low drag bucket gets into the cruise area. Heureka.

Here is a direct link to the paper:
http://www.n91cz.com/Interesting_Technical_Reports/NASA-81-tp1865.pdf

A Lancair builder has collected a list of links to tech papers, e.g. NLF215F

Link:

Interesting technical papers

There is link to the NLF215F airfoil tech paper. It was particularly interesting. Now I understood the philosophy of the profile – I was always wondering, why this profile has the low drag bucket at so high Cl (around 0.5) rather than what is realized in cruise with small aircraft (up to 0.2). But, it seems, that this airfoil is designed to be used with -10 degrees flaps. With those, the low drag bucket gets into the cruise area. Heureka.

Here is a direct link to the paper:
http://www.n91cz.com/Interesting_Technical_Reports/NASA-81-tp1865.pdf

>The NLF-414F paper

>Here is the link for the design paper about NLF-414F

NLF414 design

The NLF-414F paper

Here is the link for the design paper about NLF-414F

NLF414 design

>Interesting NASA ebook: Concept to Reality

>Here is a link to the book:

Concept to Reality

I find it quite interesting.

Interesting NASA ebook: Concept to Reality

Here is a link to the book:

Concept to Reality

I find it quite interesting.

Eggenfellner’s aircraft project

Eggenfellner seems to be building a new aircraft type:

http://www.eggenfellneraircraft.com/E2B.htm

Interesting design choice – flying wing, no tail. Sounds like no flaps on this machine for increasing Clmax.

Eggenfellner’s aircraft project

Eggenfellner seems to be building a new aircraft type:

http://www.eggenfellneraircraft.com/E2B.htm

Interesting design choice – flying wing, no tail. Sounds like no flaps on this machine for increasing Clmax.

Eggenfellner’s aircraft project

Eggenfellner seems to be building a new aircraft type:

http://www.eggenfellneraircraft.com/E2B.htm

Interesting design choice – flying wing, no tail. Sounds like no flaps on this machine for increasing Clmax.

>Eggenfellner’s aircraft project

>Eggenfellner seems to be building a new aircraft type:

http://www.eggenfellneraircraft.com/E2B.htm

Interesting design choice – flying wing, no tail. Sounds like no flaps on this machine for increasing Clmax.

Eggenfellner’s aircraft project

Eggenfellner seems to be building a new aircraft type:

http://www.eggenfellneraircraft.com/E2B.htm

Interesting design choice – flying wing, no tail. Sounds like no flaps on this machine for increasing Clmax.

Eggenfellner’s aircraft project

Eggenfellner seems to be building a new aircraft type:

http://www.eggenfellneraircraft.com/E2B.htm

Interesting design choice – flying wing, no tail. Sounds like no flaps on this machine for increasing Clmax.

Eggenfellner’s aircraft project

Eggenfellner seems to be building a new aircraft type:

http://www.eggenfellneraircraft.com/E2B.htm

Interesting design choice – flying wing, no tail. Sounds like no flaps on this machine for increasing Clmax.

Eggenfellner’s aircraft project

Eggenfellner seems to be building a new aircraft type:

http://www.eggenfellneraircraft.com/E2B.htm

Interesting design choice – flying wing, no tail. Sounds like no flaps on this machine for increasing Clmax.

>New link

>Here is a link to couple of aerodynamics articles:
http://adg.stanford.edu/aa241/airfoils/

New link

Here is a link to couple of aerodynamics articles:
http://adg.stanford.edu/aa241/airfoils/

>Found latest LH-10 flight video from Youtube

>Here is the latest test flight video of LH-10 prototype (see earlier article where I blogged about the French new plane with low drag body, tandem seating and high aspect ratio wings, LH-10):

http://fr.youtube.com/watch?v=IJjEoPiv66U

Found latest LH-10 flight video from Youtube

Here is the latest test flight video of LH-10 prototype (see earlier article where I blogged about the French new plane with low drag body, tandem seating and high aspect ratio wings, LH-10):

http://fr.youtube.com/watch?v=IJjEoPiv66U

>Airfoil documents

>There is an interesting document on Selig’s page:
http://www.ae.uiuc.edu/m-selig/uiuc_lsat/vol4/NREL-SR-500-34515.pdf.

It covers for example wind tunnel results for Wortmann FX63-137 at low Reynolds numbers.

Links to NASA tech papers about airfoils
Covers NLF 215F

Airfoil documents

There is an interesting document on Selig’s page:
http://www.ae.uiuc.edu/m-selig/uiuc_lsat/vol4/NREL-SR-500-34515.pdf.

It covers for example wind tunnel results for Wortmann FX63-137 at low Reynolds numbers.

Links to NASA tech papers about airfoils
Covers NLF 215F

>Interesting aircraft design – LH10

>This plane has some of the elements I have been thinking of an efficient aircraft to have:

http://www.lhaviation.com/site_frame/bases_marges/index.htm

Specs promise 200 kts with 100 hp. Lets see. The plane has already flown, but not yet tests that determine top speed.

According to my calculations, providing they are right, this is not that much out of place. This plane in fact, is pretty much like a two place Vmax Probe. If the airflow stays laminar in the fuselage and wings, the 200 kts might be doable. The relation of stall speed and top speed of the 3.77 projected for this plane is a reachable value. Very interesting to see how it performs and if it does not go 200 kts, why. According to what I have read and would estimate, the drag coefficient of the LH10 should be very small unless there is something wrong that causes the airflow to separate.

The view from the LH10 seems to be as spectacular than from a glider. Would be excellent aircraft for flying for fun.

The airfoil used on this aircraft is particularly interesting. Reasons:
– E.g. NLF414F produces very low drag and very high glide ratio, but not without restrictions – the area of usable Reynold’s number is limited which limits the chord of the wing to a rather long one, and the wings of the LH10 would already be below that limit. They say that it is a wind turbine airfoil. I haven’t tried simulating the wind turbine airfoils yet, it has not occurred to me that they could be actually be useful on aircraft. However, this seems to prove that this was wrong assumption, and they are in the UIUC database for a reason. Lots of airfoils to investigate…

Interesting aircraft design – LH10

This plane has some of the elements I have been thinking of an efficient aircraft to have:

http://www.lhaviation.com/site_frame/bases_marges/index.htm

Specs promise 200 kts with 100 hp. Lets see. The plane has already flown, but not yet tests that determine top speed.

According to my calculations, providing they are right, this is not that much out of place. This plane in fact, is pretty much like a two place Vmax Probe. If the airflow stays laminar in the fuselage and wings, the 200 kts might be doable. The relation of stall speed and top speed of the 3.77 projected for this plane is a reachable value. Very interesting to see how it performs and if it does not go 200 kts, why. According to what I have read and would estimate, the drag coefficient of the LH10 should be very small unless there is something wrong that causes the airflow to separate.

The view from the LH10 seems to be as spectacular than from a glider. Would be excellent aircraft for flying for fun.

The airfoil used on this aircraft is particularly interesting. Reasons:
– E.g. NLF414F produces very low drag and very high glide ratio, but not without restrictions – the area of usable Reynold’s number is limited which limits the chord of the wing to a rather long one, and the wings of the LH10 would already be below that limit. They say that it is a wind turbine airfoil. I haven’t tried simulating the wind turbine airfoils yet, it has not occurred to me that they could be actually be useful on aircraft. However, this seems to prove that this was wrong assumption, and they are in the UIUC database for a reason. Lots of airfoils to investigate…