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Old Jul 05, 2006, 05:45 AM
robin andrew is offline
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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.
Last edited by robin andrew; Jul 18, 2006 at 03:40 AM.
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Old Jul 10, 2006, 10:51 AM
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lapidar


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

I missing the elevators.

Han.
Old Jul 10, 2006, 01:33 PM
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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
Old Jul 11, 2006, 09:04 AM
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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.
Old Jul 11, 2006, 09:23 AM
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WOW!

What a beautifull and elegant design!

Great work!

Rob
Old Jul 11, 2006, 11:18 AM
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Hoi Rob.

Here You can find more.

http://www.modelbouwforum.nl/threads...debouwer.5409/

Han.
Last edited by HanW; Sep 09, 2015 at 05:55 AM.
Old Jul 11, 2006, 01:12 PM
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I like it!! Good job on a difficult model.

charlie
Old Jul 11, 2006, 05:02 PM
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I no it....
There was another smal one.
Looks good Robin Andrew.

Greats Han.
Old Jul 12, 2006, 06:41 AM
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He Robin Andrew.
Look what an nose.

Han
Old Jul 15, 2006, 12:01 AM
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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, 04:36 AM
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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.
Old Jul 20, 2006, 02:11 PM
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Hoi Robin Andrew.

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

Han.
Old Jul 20, 2006, 03:18 PM
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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
Last edited by robin andrew; Jul 20, 2006 at 03:28 PM.
Old Jul 21, 2006, 12:13 PM
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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
Old Jul 21, 2006, 12:34 PM
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It all sounds very exciting. Good luck with Round 2.


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