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Old Oct 21, 2012, 07:46 PM
Yeaman is offline
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Not watchin from the sideline
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Quote:
Originally Posted by Knoll53 View Post
Here's a CG check at 2 different wing sweep configurations. Quick work in Rhino 3D.

Version 2 will have a shorter nose and a longer tail, which looks better at the moment.
Wow. Thats one crazy looking wing, making it perform well will be interesting.
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Old Oct 22, 2012, 06:31 AM
Edwinzea is offline
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the answer 42 is
Kent that is ZetZyyyy

EZ
Old Oct 23, 2012, 04:17 AM
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the answer 42 is
BTW do not be afraid to the pointy tips https://static.rcgroups.net/forums/a...4-DSCF3297.jpg

Mine flew quiet well until I manage to land it on a pole :P

EZ
Old Dec 12, 2012, 10:58 PM
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I recently built a Kestrel that had slightly forward sweep. The main problem I ran into was balance. It required more lead than I wanted to use. I finally cut the wing in half and added rear sweep to allow the cg to be moved back. I can forsee this model possibly running into the same difficulty.
Old Dec 12, 2012, 11:04 PM
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A few photos
Old Dec 13, 2012, 10:06 AM
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That is one big ass Kestrel ! Nice work Joel. Do you have a build log or video of this bird???

Having weight in the nose is not a problem for me, but I DID modify the sweep in post #41 to reduce the nose lead. I find slightly higher wing loadings (15 oz/s.f.) to be beneficial. When the wind comes up, you want to be able to penetrate. I can easily thermal my Plank 101 at 17 oz/s.f.

Kent
Old Dec 13, 2012, 12:21 PM
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Here is the build:https://www.rcgroups.com/forums/show....php?t=1727632
Old Dec 13, 2012, 07:17 PM
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I really enjoy this forum but sometimes you cause my head to hurt....keep up the good work...
Old Dec 31, 2012, 08:43 AM
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pteroflügel


Nice design!

Try the following, the result of mucho real-world testing: you'll like it ....


Lee
Old Dec 25, 2013, 09:10 PM
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I'll probably keep tweaking this and that for another 445 days, but a potentially pitch neutral flap next to the inboard elevon, might prove useful.

Crow is available for landings and a rudder effect should be possible to help with turns. This one is intended to be a floater.

Kent
Old Feb 06, 2014, 09:47 PM
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Living on the Dark Side.
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http://thermik-board.de/viewtopic.php?f=27&t=1259

Have you seen this one Kent?
Old Feb 07, 2014, 11:27 AM
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Cool ! Thanks for the link. No I hadn't seen it. What a great design and execution. Those tail feathers look quite delicate. I see that his control system is similar to mine......that's encouraging.

The head and neck design is brilliant. It must be quite a sight in the air. Couldn't find video of it though. I see that the Alula has morphed into a motor.

Kent
Old Feb 07, 2014, 11:44 AM
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Looks like this guy has built several - very similar

https://www.youtube.com/user/rmarston/videos
Old Feb 07, 2014, 01:00 PM
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Thanks Herk. Looks like those tail feathers are strong enough!

Kent
Old Feb 22, 2015, 04:00 PM
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Since this is primarily a plank, there will be no pitch neutral flaps............don't know what I was thinking. Crow will be possible

The extended elevon is looking attractive now. Control inputs for a tight turn should provide for significant washout, hopefully reducing tip stall.

Also thinking of some dihedral, maybe 3 degrees.


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