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3 speed transmissions- how do they work?

3 speed transmissions- how do they work?

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Old 04-17-2019, 07:25 AM
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Default 3 speed transmissions- how do they work?

Hi guys,

I'm pretty familiar with the normal 2 speed transmissions with a oneway on the 1st gear and a centrifugal clutch on the 2nd. However, it wouldn't seem to work in my brain if I stack an additional stage as a 3rd gear.
So I'm wondering if someone could explain to me how a 3 speed gear tranny, such as that in Schumacher gtr, works. Any help is appreciated

Thanks!
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Old 04-17-2019, 09:29 AM
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They work with the other option how to shift which was used in the old BMT and still is used in many RTR cars like the HPI Nitro RS4.

There is no clutch shoe but a small lever arm. Still that one is going out due centifugal forces and will grab itself in a notch on the 2nd speed gear adapter. When the 3rd speed is engaged the rotation of the 2nd gear is the right direction so the notch will slide over the lever arm.

This guy tries to explain the working of that gearbox
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Old 04-17-2019, 06:23 PM
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Look up the HPI savage 3spd and Kyosho Mad Crusher 3spd manuals.

HPI:

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Old 04-18-2019, 11:47 AM
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Man... I miss HPI being a good brand.
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Old 04-20-2019, 02:27 PM
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Man what you talking about I had my hpi xl savage bullet proof . Years back on savage central
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Old 04-20-2019, 02:28 PM
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3 speed
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Old 04-22-2019, 12:20 PM
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keyword years back.

HPI sucks these days.
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Old 04-22-2019, 03:23 PM
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Never mind how the three speed transmissions work, since they are too heavy(80g equals slower acceleration) and will be completely out of range(over 400ft away) when the third gear will make a difference: you will need binoculars to see your car on the track....Even at the biggest track in the world(Lostallo) everyone uses a two speed(47g to 60g).....No need for three speed transmissions in RC racing period.....

Last edited by bertrandsv87; 04-22-2019 at 04:15 PM.
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