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Building Tips and technical articles. => 1/2 A building. => Topic started by: Chancey Chorney on September 09, 2008, 07:07:05 PM
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Hi there all. I am planning to teach my girlfriend to fly on a 1/2a PT Ringmaster re-build from an Estes kit from the late 90's I believe. It was the all sheet one. I had taught myself to fly on it and thought that it was the greatest thing. Now the problem arises. At the time, I had a choice of the all sheet model, or the model with a built-up wing. I now regret not getting that built-up model at the time. Would anyone out there have this plane in their hangar, or even better, the plans still kicking around. If so I believe that the fuselage would be the same, and I think all I would need is a trace of a wing rib, along with the number required, and span of the ribs and the rest would be a piece of cake. This would be a great up-and-coming winter project that I would love to tackle. Thanks in advance.
Regards,
Chancey
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I learned to fly on a Baby Ringmaster. Back in the Sterling days the Baby Ringmaster was just what it sounds like, a roughly 50% Ringmaster. The Beginners Ringmaster was what looked to be the same plane with a sheet wing. The one I learned to fly on was broken and rebuilt so many times it eventually got to be so heavy it lost a lot of it's performance, but it will still fly most basic maneuvers ok. I built another one mostly from the kit but I've never flown it...
In the pic you can see 5 ribs per wing, total wingspan is 21" if I remember correctly. The airfoil is pretty basic, you could probably get close using a piece of 1/2" square rounded off for the leading edge and 1/4x1/2 tapered for the trailing edge with a 3/16" or 1/4" spar. The plans don't show anything helpful and I didn't save any templates.
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Lee Strickland has a 250sq.in. Ringmaster he scaled down from the .35 kit (actually, the average dimensions from 4 kits and models!). Weight is about 10 ounces, and it has a Norvel .061 for power. A real dynamite combo, if I could ever get him to fly it again! This plane is what Leprechaun Stunt is all about.
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Dee Rice and Pat Johnston are supplying plans and laser cut rib sets through "Brothers of the Ring", for numerous sizes of Ringmasters. Check them out at
http://www.brothersofthering.com/
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thanks for the help so far guys. I will just end up grabbing a symmetrical airfoil from another 1/2a plane and inserting it. Should not be that much different. Thanks.
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I found this image over at the rc groups fourm. I have flown both the sheet and the built up wing. The built up wing was way more stable. If I were you I would pick that one. my $.02 if I were to change one thing it would be to make it a thicker airfoil.
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Thanks all for the help. Much appreciated.