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Old Jul 05, 2006, 04:45 AM
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Joined Feb 2004
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to build a LAPIDAR 1940's flyingwing

Hi, after seeing the video of HAN Witteven's very large scale flying wing on test flight's, I fell in love with it. So I contacted Han of the Netherlands via Ron Sommeron and received the very small drawing of a patent for the design in the early 1940's. It needed 2 hours to resize it to 5ft then I decided to carry 'sub C' cells for flight batteries so redrew it to 6ft span (with the sweepback its quite a large wing area).
I enclose the skeletel contruction pictures to show how i'm building the fuselarge onto the wing so it's all in one to carry about. Hope it will fit into my Fiat Punto Grande when its finished. There's still three underfins to fit underneath the wings which carry wheels and the radio to fit. What pusher motor to use is a guess at the moment but the whole structure is very lighytweight so far. So some new brushless 'wonder' motor should do the job, any sugesstions?
It's over 700 sq ins active wing area (flying wings lose some lifting area because of washout). I have to keep the cell count down to possibly 12 cells (2x6 packs or two 7 ) due to the small fuselarge interior, cheers Robin Andrew, Birmingham,UK
I've added in the picture of the model covered weighing 3lbs (with radio) but still needs a flight batt and a motor.
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Last edited by robin andrew; Jul 18, 2006 at 02:40 AM.
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Old Jul 10, 2006, 09:51 AM
Fantasy Scratch Builder
HanW's Avatar
the netherlands
Joined Sep 2002
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lapidar

He Robin Andrew.
I have find him!!!!
Looks good!!!!

I missing the elevators.

Han.
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Old Jul 10, 2006, 12:33 PM
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Joined Feb 2004
320 Posts
building a LAPIDAR

Hi Han, I thought that the flap along the trailingedge was for landing, so I designed the ailerons and the elevators as FLAPPERONS (also linked in are the rudders), also where is the CG, I guess that it is 75% from the LE at the fuselarge position?,cheers Robin
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Old Jul 11, 2006, 08:04 AM
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HanW's Avatar
the netherlands
Joined Sep 2002
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lapidar

Hoi Robin Andrew.
Here some new picts.
Somone have gift me 175 new pics off my modells.
Here 2 very nice one.
And for who will nose where CG is.

Greats Han.
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Old Jul 11, 2006, 08:23 AM
designer/builder
madrob's Avatar
Kars, Ontario, Canada
Joined Apr 2004
806 Posts
WOW!

What a beautifull and elegant design!

Great work!

Rob
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Old Jul 11, 2006, 10:18 AM
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the netherlands
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Hoi Rob.

Here You can find more.

http://www.modelbouwforum.nl/forums/...d-brandje.html

Han.
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Last edited by HanW; Jun 06, 2011 at 05:31 AM.
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Old Jul 11, 2006, 12:12 PM
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Albuquerque, NM USA
Joined Sep 2003
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I like it!! Good job on a difficult model.

charlie
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Old Jul 11, 2006, 04:02 PM
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the netherlands
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I no it....
There was another smal one.
Looks good Robin Andrew.

Greats Han.
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Old Jul 12, 2006, 05:41 AM
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He Robin Andrew.
Look what an nose.

Han
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Old Jul 14, 2006, 11:01 PM
Electric Coolhunter
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United States, TX, Fort Worth
Joined Jun 2000
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I do love seeing new shapes in the air and this one is really something!
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Old Jul 18, 2006, 03:36 AM
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HanW's Avatar
the netherlands
Joined Sep 2002
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Hoi Robin Andrew.

Hey thats looks good.

I will post an pict for David.
Hey is also interest of the Lapidar.


Greats Han.
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Old Jul 20, 2006, 01:11 PM
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HanW's Avatar
the netherlands
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Hoi Robin Andrew.

Let me see new picts off your Lapidar.
He is finisch!!!!

Han.
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Old Jul 20, 2006, 02:18 PM
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Joined Feb 2004
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finished Lapidar

Hi Han, just been out into the garden to do some pictures, cheers Robin
P.S. it's about 5lbs weight ready to go for 6ft6@ span, powered by 2x6cells by a Vortex c42 outrunner driving a 13x10 undercambered prop
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Old Jul 21, 2006, 11:13 AM
Registered User
Joined Feb 2004
320 Posts
LAPIDAR test

HI, I took it to a tarmac runway and it swerved into the grass edge on first take-off, breaking the wooden prop. The second take-off was straight up into two 30ft loops after a short run before I could stop it, but upon giving down elevator it dived slightly at speed so I let off and it did two more loops to the grass landing upside down. Broke the pilot and his seat off, thats all oh and another wooden prop; will have to push the CG much further forward.
At least I certainly have enough power on two 6 cell batteries, cheers Robin
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Old Jul 21, 2006, 11:34 AM
Light and floaty does it
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Cambridge, Great Britain (UK)
Joined Sep 2004
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It all sounds very exciting. Good luck with Round 2.
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