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Building Tips and technical articles. => 1/2 A building. => Topic started by: Tom Perry on February 25, 2008, 07:37:39 AM
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Bob Mathison put this together. The wing is about 135 square inches. Fuselage is 13 1/4 inches long. Wing is 1 inch thick at high point and has a 4 1/2 cord sans flaps with a 24" span not including wing tips.
The leading edge is made up from 3/16 square balsa and sanded to form the curved leading edge. The trailing edge is is 1/4 inch balsa and is tapered to fit the 3/16" flaps.
The fuselage is 1/4 inch balsa with a front end made from 1/4" plywood. The ply is shown in red in the diagram.
The plane was designed for use with a cox baby bee. If a golden bee or black widow is to be used the fuse front end should be shortened by 1/4".
The model was designed to be used as a trainer for my triplet grand children, hence the rugged construction.
Bob and I plan to modify the front end for use with cox production engines and the big mig .049. I've been ill for the past year and I thank bob for his help in completing the first one. The wing tips, vertical stab and canopy were left to the builder.
If the thing flys I will publish a set of plans and offer them here for free. :)
Edited to add that there are 1/32" inch ply doublers on each side that run from the fire wall to the back of the wing. Remember I built it to be rugged. LOL
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Great looking thanks TOM can't wait for a flight report. Looks like it will fly great how much does it weight. What kind of covering. I see it has cloth hinges. y1 (PE**)
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I went out in the work area to check the weight and it came to 200 GRAMS, and it is covered with silk span.
BOB
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Great looking thanks TOM can't wait for a flight report. Looks like it will fly great how much does it weight. What kind of covering. I see it has cloth hinges. y1 (PE**)
Mike,
Bob sent me a note and said it weighed 206 grams. This works out to about 7 1/4 oz. I calculate a wing loading of 7.73 oz. per sq. ft. not bad for a trainer. LL~
The finish is dope and silk span. I pre-assembled the horz. stab and elevator and used nylon ribbon purchased from th LHS. I think either Dubro or Carl Goldburg packaged them. They were applied using testors fast dry cement.
Bob and I have talked about building one with moving flaps but I want to see how this one flys first. Note that since the flaps are so large the movable portion may not be full width.