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Jan 30, 2012, 09:46 PM
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plane help

hi everyone
I have started to build a high wing plane called a Hopper...does anyone here know of the design and have the motor size recommended,I think it would be about .32 glow..... any information on this model would be greatly welcomed
aussie Robyn
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Jan 30, 2012, 11:30 PM
Lift is cheap - Drag sucks
Tom Harper's Avatar
Thermal Hopper?

Jan 31, 2012, 05:15 PM
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No it is a high wing trainer type rc 2 channel 37 inch wing span
regards Robyn
Feb 04, 2012, 12:36 PM
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Robyn, 37 inch, 2 ch , high wing.....if 15 to 20 oz weight, then an .049 engine is fine. Not a .32, unless you beef it up for U/C.
And yes, I think Tom was very correct with the Thermal Hopper--aka Cox .049, 1960.
Feb 05, 2012, 09:49 AM
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DeeBee1's Avatar
I'm confused

The Thermal Hopper is indeed a Cox engine but I think Robyn was asking about a plane called Hopper. Robyn, do you have the plans or the name of the designer?
Feb 05, 2012, 06:53 PM
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hi all
yes I was talking about a plane called hopper here are the plans....
Feb 06, 2012, 02:53 AM
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Monza Red's Avatar
Robyn, your model looks like a small sports/trainer which were popular in the 1970s.

Is this your first r/c model? If so it's a bit small for a trainer and I'd recommend one with a 5-6ft (1.5-1.8metre) wingspan.

As for engine size a modern 32 glow would be far too powerful for such a small airframe. My first model had a 50" (1.27metre) wingspan and was powered by an Irvine 20 and even that was too fast. I built a Junior 60 and put the engine in that and learned to fly.

If a 32 is the recommended size for this model it could refer to an engine of 3.2cc or.19 cu.ins. For a model of this size I would personally use nothing bigger than a 15 (2.5cc.)
Feb 06, 2012, 05:41 AM
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DeeBee1's Avatar
Originally Posted by Monza Red
For a model of this size I would personally use nothing bigger than a 15 (2.5cc.)
I can't make it out clearly but it at the top left-hand corner it looks as if it says that the motor is 2,5cc. So Monza is correct.
Feb 19, 2012, 04:09 PM
Registered User


thanks to all for your replies
I'll go with a 2.5 and see what happens
regards Robyn

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