Double Whammy (oz882)

 

Double Whammy (oz882) by Walton Hughes from Air Trails Annual 1952 - plan thumbnail

About this Plan

Double Whammy. Control line sports stunt bipe. Negative stagger. For .29 or .35 power.

Quote: "Negative stagger, 'real' appearance. Capable of performing the entire AMA stunt pattern, this unusually attractive stunt model is a real rugged star. Various size engines can be used for different types of flights. Top flying with a .35. Double Whammy, by Walton Hughes.

Double Whammy is a good-looking biplane designed for many hours of flying as well as nice appearance. This ship could be used for control line sport flying, with a Fox .29 or .35 engine, and will fly very well with the extra weight of a super finish. It also makes an excellent contest control line stunt model for AMA rules when built with careful attention to reducing weight. A Fox .35 or engine of equal power should be employed for stunt.

The odd fuselage construction was incorporated in this design to eliminate troublesome cabane struts between the fuselage and upper wing. These struts are good looking but are usually the main source of trouble in assembly, and are so weak that the top wing flips off at the first rough landing. The Double Whammy, with top wing attached directly to the fuselage, will withstand considerable bouncing around.

If this ship is being built for contest stunt flying, overall weight and correct balance should be kept in mind at all times. The two controlling factors are proper selection of wood and limiting, the weight of the finish or paint job. The fuselage is quite large in sections and will have sufficient strength when a soft grade of wood is used throughout. Select soft to medium 3/32 sheet for the sides. 1/16 sheet would be strong enough but this does not allow sufficient material for sanding when the complete fuselage is assembled.

The bulkheads should be lightweight quarter-grained balsa. Balsa blocks for fuselage top and bottom and wing tips should be soft enough so that the corner can be mashed down slightly with the ball of the thumb. This type of wood is fast to carve and will be light when hollowed down to 1/4 in thickness. The elevator and stabilizer are at the extreme rear of the ship and will cause the plane to be tail heavy unless light wood is selected. Try to find a piece of soft 1/4 in sheet that is slightly hard on one edge. Place this edge along the hinge line when laying out the parts. In general, all parts to the rear of the wing should be made from the lightest wood, and heavier, stronger material used around the front..."

Update 29/04/2014: Replaced this plan with a clearer copy at 400 dpi, thanks to JeffMac.

Double Whammy, 1952 Air Trails Annual.

Update 15/06/2019: Added article, thanks to RFJ.

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Double Whammy (oz882) by Walton Hughes from Air Trails Annual 1952 - model pic

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