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4-speed RC Sequential Gearbox . 4-spead Sequential Gearbox with PF-control with building-instructions . Hi folks !! For some time I wanted to make my own remote-controlled reliable gearbox with more than 2 speeds. I've seen some nice designs, like Sariel's aeroshift and Sheepo's 7+R gearbox, for which I've had the honour to make building-instructions. See mine in action: There were a number of important aspect: * Reliable drivetrain * Preferably 4-speeds * Being able to switch gears with a single motor * No pneumatics Like in Sariel's design, the transmissions consists of identical modules, where each module has 1 driving-ring and adds 1 gear. All the gear-ratios are identical: 5/3 from 1st to second, 5/3 from 2nd to 3rd and 5/3 from 3rd to 4th. The total amount of gear-reduction is about 4,63. By using the 24-8-tooth gear combinations (instead of 12-20), ratio's of 3/1 can be achieved. For effeciency-reasons, the gearbox only reduces speed, the highest gear is actually neutral (same speed coming out as is coming in). Also for the efficiency, the module(s) with gear-reduction are located nearest to the input. This way the dead gears have less effect. The switching systems was inspired by Sheepo's gearbox, but I wanted to use the ridged axle-joiners insted of the smooth ones Sheepo used. This way the driving-rings would stay in place better, contributing to a more reliable drivetrain. This gearbox will be used in my new supercar, with which some succesful driving tests have been done. I plan to expand the desing with some kind of stepped motor to improve the swithing-system, but for now it works quite nicely. I've made complete step-by-step building instructions so you can include this gearbox in your own designs. You can download them in my brickshelf-folder. All comments & suggestions are welcome.

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