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Old Jan 06, 2013, 03:35 AM
John Wright is offline
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Colchester UK
Joined May 2004
476 Posts
Hi Thomas

I have had the same problem you have had for checking the CG of large and heavy models. I first mark the wing root centre line, then mark the range of CG positions and draw it on the rib marked clearly. Then I make a thin plate that I can sandwich between the centre section and the wings. The plate I have made in a variety of materials depending on the weight of the plane. On the Arado I used thin steel sheet, on the Horten I used thin ply. The plate was secured by the wing tube joiner and the anti rotation pin. Its weight is insignificant in relation to the weight of the model. The Arado came out at over 31 KG. The Boulton Paul at 20.9Kg and the Horten at 19 Kg.

The positions of the CG range are transferred to the plate and holes drilled for the range. I made some simple hangars to fit round a spare piece of wood and managed to lift the Arado on my own. It is accurate and simple.

John
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