Cyclone (oz16613)

About this Plan

Cyclone. Control line profile model. Wingspan 18 in, for .5 - .8 cc engines.

Quote: "Built in a couple of evenings. Just the job for .8 glow or .5 diesel motors. Have fun with the Cyclone. Specially designed for the Keil Kraft Handbook, by Ernie Webster.

Have you a motor in the .5 - .8 cc class? Then the snappy model on the centre pages is for you. A couple of sheets of 1/4 in balsa, a few inches of 1/8 sheet balsa and one or two odds and ends are all that you need.

Construction is simplicity itself. Just follow the instructions and you will have your Cyclone ready to fly in double quick time. Most of the shapes are straight lines, so use a steel ruler as a cutting guide.

Commence by cutting out all parts. The fuselage and fuselage nose doublers are cut from 1/4" sheet. Cut a sheet of 1/4" balsa in half to give two 18" lengths and mark up the two wing parts as shown on the plan. The bellcrank mount is a half inch square of 1/16" ply and the fin, fin fairing, tailplane and elevator are cut from 1/8" sheet, Make the engine bearers from 1/4" square hardwood and cement them in place in the fuselage. When set. drill the bearers to take the engine fixing bolts and install them, locking each pair by soldering a pin across the slots in the bolt heads. Carve the port (left hand) nose doubler to clear the bolt heads, taper the rear end as in the top view of the fuselage and cement it in place. Similarly taper the rear of the starboard (right hand) block and check that the cut away clears the engine.

If you are fitting a Keilkraft 4A stunt tank as shown on the plan, file grooves in the inner face of the starboard nose doubler to clear the vent and filler tubes of the tank. Next, cement the doubler and tank in place. When set, round off all edges to give a smooth sleek section. For additional strength. the fuselage may be tissue covered.

Cement the fin and fin fairing together and round off the edges, then cut the rudder free and re-cement to the fin with about 5/16 offset as shown on plan. The fin can then be tissue covered and cemented to the fuselage, Round off the edges of the tailplane and elevator, cut a slot in the elevator for the control horn and cement it in place, sticking a patch of silk or bandage over it as shown. Hinge the 'tailplane and elevator together using tape or silk to make the hinges, then tissue cover and cement in place in the slot in the rear of the fuselage.

Cement the two portions of the wing firmly together and when set, carve and sandpaper to the section shown on the plan and trim the tips to shape, Mark the position of the bellcrank mount, thread a 6BA nut through the mount and lock it securely with a nut. Recess the wing to take the mount and bolt head and stick the mount in place. The wing should now be tissue covered and cemented to the fuselage.

Further coats of sanding sealer, sanding between each coat will be needed to produce a surface suitable for colour doping. Finally, bend the line guide and attach to the wing tip where indicated. Choose a bright colour scheme for your Cyclone. If you are using a glow motor, fuel proof the model.

When the dope has dried, make up the bellcrank assembly and place it on the mounting bolt with a washer either side of the bellcrank. Adjust the nuts so that the bellcrank moves freely but without undue rocking. Bend the ends of the leadouts when in place and check that the line clips arc level when the elevator is at neutral.

Fly your model on twenty foot lines and you should have a lot of fun. Better still, get your friend to make another Cyclone and try combat flying. A four foot long, one inch streamer of crepe paper attached to each fin with four feet of thread and you are all set for a dog fight. If you have built your plane carefully, you will find it extremely tough, so don't be afraid to enjoy yourself!"

Direct submission to Outerzone.

Quote: "Hi Mary/Steve. Please find attached the centrefold from the 1961 Keil Kraft Handbook designed by the legendary Ernie Webster. I drew out the wing full size and added the instructions on one sheet. Unfortunately the text is a little unclear, so I include a separate scan, perhaps you can work your magic.
I would have been 13 when I bought the handbook and promised myself I would build a Cyclone, I'm now 77, could still happen!!. Best regards, Tony Johnson."

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