Graupner Terry motor mounting issue - RCCanada - Canada Radio Controlled Hobby Forum
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Old 08-20-2005, 01:14 AM   #1
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Graupner Terry motor mounting issue

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I have a Graupner Terry (foam) with a couple of dozen flights on it. It uses a speed 400 motor that slips into a pocket in the nose of the plane and is retained by a couple of drops of epoxy so that the motor can't slide out. Graupners' instructions say to cut a couple of cooling channels into the engine pocket foam in order to keep the motor cool. I did this as advised. Now after about 25 flights, heat from the motor has melted the foam around it and the motor is very loose in the mounting cavity (to the point that it is unsafe to fly). It used to be a nice snug fit. Does anyone have any suggestions as to how I can fix this without replacing the fuselage?

This is a picture of the Terry fuse. The motor just slips snugly into the nose and a few drops of epoxy retain it. Its now VERY loose due to engine heat melting the foam. What to do? Suggestions?

BTW, the Terry is a great flyer!
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Old 08-20-2005, 01:46 AM   #2
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1) The plane uses the dense foam. Can you glue in some pieces from
packing material? maybe fine carve to shape? Check with GM

2) Expanding foam from the hardware store?

3) creat a nose plywood mount for the two screws and epoxy in. Then cut a top motor hatch?
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Old 08-20-2005, 02:15 AM   #3
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I had one of those and they are great flyers. But never had the problem like yours. Maybe you are drawing too many amps and so the motor is getting hotter than it should. I was using 7 cell Nicds with the 6x3 folding prop.

The cooling holes in the foam should line up with the cooling cutouts in the speed 400 motor. In your picture, I can't see them. Maybe there are not big enough.

I would second the plywood mount idea. Get a 3/32 ply, drill 2 holes for the speed 400, stick it on the nose of the fuse and screw the motor on, ain't going anywhere.
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