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Old Jan 30, 2012, 09:46 PM
aussie robyn is offline
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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
regards
aussie Robyn
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Old Jan 30, 2012, 11:30 PM
Tom Harper is offline
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Lift is cheap - Drag sucks
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Thermal Hopper?

Tom
Old Jan 31, 2012, 05:15 PM
aussie robyn is offline
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re


No it is a high wing trainer type rc 2 channel 37 inch wing span
regards Robyn
Old 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.
John
Old Feb 05, 2012, 09:49 AM
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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?
Old 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....
https://www.rcgroups.com/forums/show...=4610463&stc=1
Old Feb 06, 2012, 02:53 AM
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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.)
Old Feb 06, 2012, 05:41 AM
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Quote:
Originally Posted by Monza Red View Post
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.
Old Feb 19, 2012, 04:09 PM
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thanks


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


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