Double Bubble (oz5182)

About this Plan

Double Bubble. Simple radio control profile sport model.

Quote: "Double Bubble is a simplified rudder-only 1/4A plane with a profile fuselage and its R/C equipment protected by pair of standard plastic canopies. Uses Cox .02 engine and simplest possible radio installation - CitizenShip LT-3 relayless receiver, matching CS Compound escapement and a 3 volt battery. A rugged little plane of 30 in span and a stable flier.

Radio control equipment has become small enough and light enough, considering the simple power requirements of the latest receivers, that a Quarter-A plane can almost be considered a beginner's project. We say almost for several reasons. On the plus side, these little jobs, surprisingly sturdy, will take much more of a beating then larger planes. Also, damage is repaired easily. Often a few pieces of cellophane tape will enable you to keep flying till you get back to the shop for more permanent repairs. Also a plus, the equipment is of the very simplest (we have used a relayless outfit here) eliminating quite a bit of wiring and the fussy sensitive relay. Major minus consideration is that tiny planes are pretty 'jumpy,' it takes a quick thumb to fly them at all smoothly.

Since Double Bubble is simple and goes together rapidly, beginner or otherwise, give it some consideration. Based upon a profile fuselage, to protect the radio equipment from damage and to keep out engine exhaust we employ two standard canopies. One is cemented in place, the other is removable so you can service the radio. Canopies are 3/4 inch Berkeley for their P-51. These are wider than necessary, so if you want to 'draw' your own by stretching heated acetate sheet over a form, you can come up with mere streamlined covers.

Wing area is 140-sq-in and most is useful since little is lost at the center. Our test plane is just over 10-oz, thus wing loading is quite reasonable..."

Update 25/3/2024: Replaced this plan with a clearer copy, scanned at 400 dpi from fullsize, thanks to dfritzke.

Direct submission to Outerzone.

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