Birdwing - A 60" Semi Scale Flying Wing - RC Groups
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Sep 16, 2007, 07:39 PM
Registered User
Geode's Avatar

Birdwing - A 60" Semi Scale Flying Wing

This project was intended to investigate the flying envelop of a 60" flying wing. Design goals are intended for all around flying wing on light wind slope and flat land thermal.

Wing planform is borrowed from Rajah Brooke's Birdwing Butterfly. Airfoil used is Pete Wick's PW1211's for F3K plank.

Following pictures and videos are for HLG and DLG performance. The second flight is a four minutes themal ride and I have to cut it short in order not to crach my computer. Stay to the end of the 2nd video for a hand catch. Hope you enjoy.

Detail Build log and slope performance can be found in slope forum.
Last edited by Geode; Sep 17, 2007 at 02:31 AM.
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Sep 16, 2007, 08:07 PM
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Geode's Avatar

HLG and DLG Performance

HLG launch

Birdwing Flying Wing - HLG (2 min 10 sec)

DLG launch and thermal

Birdwing Flying Wing - DLG (3 min 27 sec)
Last edited by Geode; Jun 18, 2008 at 01:56 AM.
Sep 16, 2007, 10:13 PM
wishes this caption was longe
will_newton's Avatar
dude, your planes always make me smile.

everyone else, check Geode's blog for other cool stuff!
Sep 17, 2007, 01:17 AM
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martseger63's Avatar
That's soo cool. I'm building your Manta 60" dlg,it's coming together pretty nice, i think this plane could be my new project, any change of releasing the plans?
Sep 17, 2007, 01:31 AM
dougmontgomery's Avatar
Very Nice Work I am impressed,
Geode-You must not sleep either thinking that much.
Sep 17, 2007, 01:52 AM
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Geode's Avatar

Birdwing Sloping Video

Hi guys, Thanks for all your nice words.

Here is some more videos for viewers like you .

Just uploaded the slope soaring video at Slope Forum. Hope you enjoy.

As for plan, will post on RCGroups once SSDC contest is over.

A word of warning: Birdwing is more of a sloper than a DLG. Launch height is no comparison to regular DLG. But the flight envelop is pretty respectable with the PW1211 airfoil.
Last edited by Geode; Sep 17, 2007 at 02:03 AM.
Sep 17, 2007, 08:09 AM
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martseger63's Avatar
I thought of that, it's a nice plane to fly on the field, i dont care so much for the shorter flights. I can also slope it, and its quite compact. I really enjoy your planes. Keep up the wonderfull work!
Last edited by martseger63; Sep 17, 2007 at 09:42 AM.
Sep 17, 2007, 09:39 AM
Registered User floats.....nice plane.
Totally thermal ?
Sep 17, 2007, 11:26 AM
Registered User
Geode's Avatar
The wind is pretty light to make any significant slope lift along the tree line. But those trees do gather a lot of thermals. To get to the the tree line, I have to catch a low level thermal, ride it up to the tree line and stays there for the big thermals to come.
Sep 20, 2007, 04:46 AM
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martseger63's Avatar
Not to be annoying , but i'm really waiting for these plans. Are they coming any time soon ?
Sep 20, 2007, 11:56 AM
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Geode's Avatar
Hi martseger63,

Thanks for your interest. Just need some final touch up for Birdwing plan.

See attachment for Rev 0.0 foam wing plan (not a printable version), PM me with your email ID and I'll send out the printable version over the weekend.

Will make Birdwing plan available 9/22/07 once SSDC is over. Sorry for the waiting and I hope you'll enjoy the build soon.
Last edited by Geode; Sep 20, 2007 at 12:11 PM.
Sep 21, 2007, 08:06 AM
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martseger63's Avatar
Thx, will be starting the build when manta is finished, im addicted to your planes
Sep 24, 2007, 11:30 PM
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Geode's Avatar

SSDC Voting Started

If you like what you see here, please pay a visit to SSDC voting thread to appreciate the craftsmanship and ingenuity of the seven SSDC finalists, and make an informed vote!

May be we could also have something similar here at DLG forum someday .....

Sep 25, 2007, 12:59 AM
infopimp's Avatar
Saw this plane fly first hand - it out performed all our wings in the light lift that day and looked very organic! Gets my vote!
Nov 22, 2007, 12:01 PM
Red Merle ALES VI
Curtis Suter's Avatar
What a neat design.

I've been working on for years actually an MS Excel spreadsheet for determining the balance location of a model.

I've used this program for about 15 years and it's been flawless.

I put in this wing as I wish to build it perhaps in the Spring and my data is quite close to Goede's plan.

Soon, I'll have a spreadsheet that will calculate the Geometric twist required for a swept wing, the formulas are from Dr Panknin and are very accurate as well.


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