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Revell 1:32 Shelby Cobra Instruction Sheet

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Interesting Facts about the Shelby Cobra

In 1904 John Portwine and John Weller, both of England, started building 3-wheel delivery carts. In 1962 Carroll Shelby produced his first production Cobra. Between these years lies the long and rich history of the Cobra. While Shelby' was an international race car driver, he dreamed of building his own racing car. In 1961 Carroll Shelby contacted both Ford and AC Car Co. Ltd. and told them of his ideas. Both were interested. Shelby flew to England and worked with the AC engineers on a prototype body. Meanwhile, Ford was developing the 260 cu. in. Fairlane engine. Late in 1961 the first Cobra was tested and met with enthusiastic approval. In March 1962 the first production Cobra rolled off the assembly line. With a 289 cu. in. Fairlane engine, it became the world's fastest production sports car. As each new Ford Cobra comes off the assembly line in Venice, California, its influence is further felt in the sports car world.

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Assembling a Revell Shelby Cobra

Each of the following factors affects the performance of any model slot car.
After you are sure that your racing motor is performing properly, here are some other things to checkout in order to get peak performance from your model racing cars:

1. Make sure the rear axle spins freely in the flanged bearings. Check the frame alignment at bushing points. Carefully straighten the frame if it has been twisted or bent. Sliding the axle back and forth through both bearings will help seat the bearings at the proper angle. Apply light oil to axle bearings.
2. The motor shaft should be on a line that intersects the rear axle at dead center when viewed from the side. (See Figure 1)
3. The center line of the motor shaft should also intersect the axle at a 90° angle when viewed from the top. (See Figure 2)
4. Proper gear mesh is very important. Never bottom the teeth - gears set up too tightly always result in a poor running car. To correctly mesh your Revell gears, bottom the gear teeth and finger tighten both 5.40 axle nuts and wheels up against the nylon spacers. Then back off the wheel on the side of the axle closest to the hub side of the crown gear 1 turn. Now jam the 5-40 nut against the wheel to lock it in place. Back off the wheel on the other side of the axle one turn and lock in place with nut. (See Figure 3) Gear should now turn quite freely in a positive manner. Rapid gear wear will result if only the tips of the gear teeth meet. Maximum performance is obtained when the gears contact each other just enough to make positive transmission. Apply light grease to gears. After 1 hour of running, crown gear and motor pinion gear should be adjusted for tighter mesh. Gears must not bind.
5. Mount the body and check to make sure that both axles and all moving parts have enough running clearance. If nylon spacers touch the body on G.P. cars, enlarge the axle openings slightly or readjust the chassis length. Motor brushes and spring plunger assemblies should not contact ether frame or body.
6. If your motor still seems to lack performance, try experimenting with different gear ratios. Keep in mind that the size of your tires will also affect the overall drive ratios. Finally, make sure your pickup is properly installed and is making constant electrical contact with the track. If car runs in reverse, switch motor lead wires to pick-up shoe.