About this Plan
Whirley. Free flight model for Jetex 50 power.
Quote: "'Whirley' takes about 37 minutes to build. It's ideal for the beginner in model 'copters, to get the feel of 'copter performance. It's great for the kid, to keep him busy on the field. It's also a life-saver for one who finds he has nothing to fly a half hour before meeting the guys and, the materials can be found in any modelers scrap bin.
BUILDING: Start with the body. Sand down a light balsa block to a streamlined shape, then cut it in half. Next, form the three landing gear parts and rotor shaft from paper clips. Press and cement the shaft to one half and the landing gear to the other. To strengthen, cement a hard 1/16 balsa disk between the body halves. Send the assembly and give it one coat of clear dope. Window markings and decorations are applied with India ink or a ballpoint pen.
Cut the blades from hard 1/16 sheet and sand them to a very thin airfoil shape - the thinner the better. Give them two coats of dope and sand smooth. Check and keep the blades from warping while doping. The motor boom is of 1/16 x 3/4 plywood, or hard sheet balsa, sanded smooth. The boom should be at least one-half the diameter of the rotor. Drill a hole exactly through the center and spread a little cement around the shaft hole to keep it from wearing down. All that's left to do are the wire parts. These are essentially simple, don't let angles and degrees scare you. Try to approximate the bends as closely as possible and adjust them later. The wire hinges are made from three paper clips - use copper clips for easier soldering. If you don't have access to a soldering iron, the joints can be secured using thread and lots of cement. This works almost as well. Straighten out two paper clips. From these, bend a piece of 1-1/4 in at 60° as shown on the plan. Then, at the other end, bend 1/2 in up at a right angle and loop the end. (See drawing.) These arms should be soldered to a rectangular tin plate, checking to see that the parts are parallel and are placed as shown on the plan. Drill a hole through the center of the tin plate. The blade stops are half-paper-clips, soldered on and bent to prevent the blades from drooping down. Cement and thread the tin plate with hinges to the plywood motor-boom so that the holes line up. Solder a washer to rotor shaft, place on the rotor assembly, and solder another washer on top to hold the rotor in place. A 1/16 ID aluminum tube is cemented, and gauzed, onto each blade as shown. Use cement liberally.
The blades are then simply slipped onto the wire hinge and the wire is placed through the loop. The blade incidence should be about 5°. Adjust by bending the loop up or down. The Jetex 50 clips are cemented and threaded to the boom..."
This plan was printed in Flying Models Decade of Designs (1), published 1960.
Direct submission to Outerzone.
Update 21/07/2019: Added article, thanks to RFJ.
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