Archive for November, 2008

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:

Advertisements

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:

Will it blend?

Seems like, yes it did ūüôā

Created with the latest iRhino alpha.

Changes:
* Placeholder engine nacelles added.
* Rudder added

I was reading today the book “Fluid dynamic drag” a bit and got kind of inspired: canopies and wind shield discontinuity contributes very much to the drag coefficient of the fuselage. Not only the laminar nose seems important, but all kinds of places where something ends and something else continues are sources of waste of engery.

So if the plane is completely faired with no discontinuity of any kind, theoretically the drag coefficient should be very low.
In this picture, the engine nacelle placeholders are just placeholders, because they are not yet accurate airfoil, and it has not been taken into account that in Rotax engines the propeller shaft is not in the middle of the engine, but almost on the top of the engine, this creates a fairing that has the lower side turned up a bit and is therefore not completely symmetrical.

The engine nacelles may need to be moved outwards, otherwise there is not enough clearance between the fuselage and the propeller arc.

I was also reading one day some NASA tech paper about wing tip mounted propellers. I have not drawn such things to this picture, but I may add it later – small brushless DC motor on each wing tip lowers the induced drag quite a bit according to the tech paper (although on high aspect ratio wing the effect is not that radical as on with a low aspect ratio wing that would otherwise be poor).

Potential issues for placing engine nacelles on wings (which seems pretty necessary for a twin, after all, may be the least bad compromise) and blending are the followings:
* the wings take a lot room to build (because they are very long)
* making the mold is difficult, because it has to be done from CNC cut pieces and glued together
* moving the center section to airport or transporting it in a container may be challenging, because if the area up to engine nacelles is continuous part of the center section and not separatable, it means that this is basically wider than the width of the container, shipping the plane to another continent might be a challenge (it seems that it would need to be flown like the design point has been set)

Will it blend?

Seems like, yes it did ūüôā

Created with the latest iRhino alpha.

Changes:
* Placeholder engine nacelles added.
* Rudder added

I was reading today the book “Fluid dynamic drag” a bit and got kind of inspired: canopies and wind shield discontinuity contributes very much to the drag coefficient of the fuselage. Not only the laminar nose seems important, but all kinds of places where something ends and something else continues are sources of waste of engery.

So if the plane is completely faired with no discontinuity of any kind, theoretically the drag coefficient should be very low.
In this picture, the engine nacelle placeholders are just placeholders, because they are not yet accurate airfoil, and it has not been taken into account that in Rotax engines the propeller shaft is not in the middle of the engine, but almost on the top of the engine, this creates a fairing that has the lower side turned up a bit and is therefore not completely symmetrical.

The engine nacelles may need to be moved outwards, otherwise there is not enough clearance between the fuselage and the propeller arc.

I was also reading one day some NASA tech paper about wing tip mounted propellers. I have not drawn such things to this picture, but I may add it later – small brushless DC motor on each wing tip lowers the induced drag quite a bit according to the tech paper (although on high aspect ratio wing the effect is not that radical as on with a low aspect ratio wing that would otherwise be poor).

Potential issues for placing engine nacelles on wings (which seems pretty necessary for a twin, after all, may be the least bad compromise) and blending are the followings:
* the wings take a lot room to build (because they are very long)
* making the mold is difficult, because it has to be done from CNC cut pieces and glued together
* moving the center section to airport or transporting it in a container may be challenging, because if the area up to engine nacelles is continuous part of the center section and not separatable, it means that this is basically wider than the width of the container, shipping the plane to another continent might be a challenge (it seems that it would need to be flown like the design point has been set)

>New ring tone for your Maemo device or any other mobile device

>I recently created a new song ( these can be found from my music blog from http://karoliinamusic.blogspot.com ) and here is a shortened version of it which I tried to make useful as use as a ring tone for mobile devices. It is a bit more equalized and bit more compressed also than the hifi-version of the song. By all means, you can use also the actual song as a ring tone, but this has been cut to start from the middle to be more useful – ring tones usually play only a short time and long intro part is not very useful on them then.

I have this on my N810 and also in my N95 and I think it works pretty well. You can in principle use it with any mobile device which understands mp3 format and allows you to assign these files as ring tones.

I am planning to do a measurement of the frequency response of the tiny speakers to equalize this better for them (now this has too much mid frequencies maybe for the tiny speakers, because this mix is still “almost hifi”). I haven’t done that yet, I should dig my measurement microphone from storage to be able to do that (the Internet tablet / phone mix would be counter-equalized with that). However, this version already works on your device, so feel free to use it.

Download it from here:
Sky Party – ring tone version 1

The file bitrate is 128 kbit/s and the file size is 2188433 bytes which is around 2MB. You can install it by for example reading this with the N810, saving the file and then assigning it as a ring tone for the internet call. Alternatively you can download it with your computer, use the USB cable to connect the computer to the device and then copy the file to the device’s file system.

If you are using Mac to download the file (instead of the mentioned Internet tablet for example), you may need to right click the file with CTRL + mouse button or otherwise the Quicktime starts to play it instead of downloading the file.

All feedback is welcome.

New ring tone for your Maemo device or any other mobile device

I recently created a new song ( these can be found from my music blog from http://karoliinamusic.blogspot.com ) and here is a shortened version of it which I tried to make useful as use as a ring tone for mobile devices. It is a bit more equalized and bit more compressed also than the hifi-version of the song. By all means, you can use also the actual song as a ring tone, but this has been cut to start from the middle to be more useful – ring tones usually play only a short time and long intro part is not very useful on them then.

I have this on my N810 and also in my N95 and I think it works pretty well. You can in principle use it with any mobile device which understands mp3 format and allows you to assign these files as ring tones.

I am planning to do a measurement of the frequency response of the tiny speakers to equalize this better for them (now this has too much mid frequencies maybe for the tiny speakers, because this mix is still “almost hifi”). I haven’t done that yet, I should dig my measurement microphone from storage to be able to do that (the Internet tablet / phone mix would be counter-equalized with that). However, this version already works on your device, so feel free to use it.

Download it from here:
Sky Party – ring tone version 1

The file bitrate is 128 kbit/s and the file size is 2188433 bytes which is around 2MB. You can install it by for example reading this with the N810, saving the file and then assigning it as a ring tone for the internet call. Alternatively you can download it with your computer, use the USB cable to connect the computer to the device and then copy the file to the device’s file system.

If you are using Mac to download the file (instead of the mentioned Internet tablet for example), you may need to right click the file with CTRL + mouse button or otherwise the Quicktime starts to play it instead of downloading the file.

All feedback is welcome.

>Three turbos in Subaru EJ22

>Hey watch this out:
http://www.youtube.com/watch?v=bU2elPTJyqA

Pretty interesting system built around the Subaru.