Stinson Reliant SR-7A (oz184)


Stinson Reliant SR-7A (oz184) by Paul Karnow 1937 - plan thumbnail

About this Plan

Stinson Reliant. Rubber powered free flight scale model of the taper-wing Stinson Reliant SR-7A.

Update 21/12/2013: Replaced this one with a clearer version, thanks to theshadow.


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Stinson Reliant SR-7A (oz184) by Paul Karnow 1937 - model pic


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Stinson Reliant SR-7A (oz184) by Paul Karnow 1937 - pic 003.jpg

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User comments

Hi Steve... May I enter a slight correction? You have the Stinson SR7A, the one with all the wing ribs, listed as 25 inch span. It also appears in the tag matrix in the 25-30 inch category. Its actual span is 31 inches, and that's about the way it prints out. I have a copy of the original plan, and it's 31 with rib spacing of 5/8 inch. It'd be a super build for my old age if I thought I could figure out a good way to punch all those weakening holes on the ribs. Wouldn't that be a super plan for a laser cut short kit? That and Cole's Smoothie. Regards,
art - 08/08/2014
Thanks art, have set this to wingspan=31in now.
SteveWMD - 08/08/2014
In answer to Art re lightening holes: You can sometimes buy razor-edged hole cutters (basically chrome steel tubes which have one end thinned and sharpened) from specialist suppliers, but failing that, get some plain brass tube of appropriate diameter and simply file one end so that it has a circular cutting edge. It doesn't have to be perfect, but remove obvious burrs. File only on the outside of the tube, chamfer it back a distance of about 1mm - don't touch the inside. The aim is to let the inside of the tube form a circular cutting edge. The finished cutter should be about 8 - 12 ins in length. Then trace your ribs onto sheet balsa and cut the lightening holes by gently rotating the tube into the wood (use a cutting mat beneath to prevent fracturing the wood on the opposite side). Using just hand pressure you can cut large, neat holes in 1/2 inch thick sheet with this method. Thinner wood takes no time at all, just a gentle half turn - and you'll be surprised at how perfect the holes are. Once all the holes are cut, you can start slicing around the rib profiles to make the complete ribs. Best do it in that order, or you'll run the risk of splitting the wood of an otherwise completed rib. I made a set of circle cutters this way 25 years ago - it took me about 30 minutes and I've never had to re-sharpen them. Regards,
SBurling - 08/08/2014
Great idea for cutting holes! Live and learn.
tom adcock - 19/01/2022
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