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My question is simple: I want to make a dog clutch system for a wakeboarding cable system and was wondering if a flex (spider) coupler could used? The power, velocity, torque is similar to a go kart / lawn mower, atv etc.

Dog clutch:

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Flex Spider Coupler (the one with a nylon/plastic insert)

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Background: I am working on a unique wakeboarding cable system design which goes forward and backwards at the same speed. The idea is to build a hybrid winch/cable 2.0 system which uses a 6.5 HP 3600 RPM engine to pull a 200 pound person 30 km/h (spool is 0.3 m radius). Ideally a system would have a neutral, forward and reverse, but forward and reverse alone would also be acceptable (with a skilled operator).

I can easily gear down to get the required speed/torque but I currently can not find a transmission/gear box which offers reverse at the same or similar speed ratioto forward. The two options I found are a:

1/ TAV (Torque-A-Verter) Style Reverse Gearbox which has a 1:1.3 forward, 1:2.6 reverse and a neutral

2/ Planetary reverse gearbox which has a 1:1 forward, 1:1.5 reverse and no neutral.

If this is not possible, I would also be interested in alternative solutions.

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  • $\begingroup$ I gave a comment to this question earlier. Duplicate posts see mechanics.stackexchange.com/q/65135/10976 $\endgroup$ – Solar Mike Apr 3 '19 at 16:05
  • $\begingroup$ It sounds like you need a small marine f-n-r tranny like Hurth/ZF 6 or PRM 60. They are specifically designed so they can be shifted f-r-f etc under full engine torque. (for the non-boaters - because boats don't have brake pedals). $\endgroup$ – Phil Sweet Apr 3 '19 at 20:11
  • $\begingroup$ @PhilSweet Are these geared to be about the same forward and reverse? I see it's 1.5:1 I believe $\endgroup$ – Wakeboarder Apr 5 '19 at 2:28
  • $\begingroup$ yes, within a fuzz. They are both available in nominal 2:1 and other ratios. $\endgroup$ – Phil Sweet Apr 5 '19 at 10:25

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