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SPAD , Simple Plastic Airplane Design

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SkyTrooper

Tue Apr 27 2010, 02:24AM

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Registered Member #49

Joined: Fri Jun 25 2004, 01:38PM
Posts: 693

If you really cannot change the cg try extending the motor mount a bit. (But first maybe the throws can sort you out if you feel that the c.g is correct like Bex mentioned.)

Electric is the way to go! good stuff

Let's go fly again....

T-Rex 450 V2 + bling
T-Rex 600 E CF
Raptor 90 3d CF E
Tamiya Hotshot 1 x 2
Tamiya Thundershot
Tamiya TB evolution 5, almost complete

They have robbed me of my flying time...
How could this be!

meester50

Wed Apr 28 2010, 02:45AM

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Registered Member #1469

Joined: Fri Jan 18 2008, 01:42AM
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So I made some changes.

1) I cut the round ended of the vertical fins straight back
2) Cut a 'V' in the horizontal fin (to make it a little lighter)
3) Added an extra piece of ply to the motor mount (extending it a bit)
4) Added a small spinner
5) Added 25g lead just under the motor.

Now the wing balances almost 1cm infront of the spar.

I was not able to test as it has been raining since the weekend. Will probably be able to see how it performs tomorrow.

[ image disabled ]

[ Edited Wed Apr 28 2010, 03:01AM ]

SkyTrooper

Wed Apr 28 2010, 11:48AM

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Registered Member #49

Joined: Fri Jun 25 2004, 01:38PM
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Extending the mount without adding weight is usually the idea behind doing it and it works well for me. But if you need to add weight also, then well i'm not the one working on it so i can't get a feel for it. But hope it works out