I recently bought a new proboat impulse 32, I am having issues with breaking flex shafts. I ran approximately 17 battery packs with the stock shaft before it snapped mostly run at 75% throttle and I'm running 2x 3s battery packs. It is breaking where the flex shaft meets the solid shaft. I replaced the stock shaft and it snapped in the same spot immediately upon taking the boat out. I replaced it again and managed to run 2 packs and it started to break in the same area. I am just getting into the hobby of rc boats, have owned planes and drones so this is all kinda of new to me. I do grease after each run as well with marine grease. Can anyone give me any suggestions as I am tired of losing props and shafts, starting to get discouraged. 😒
Flex shaft issues..impulse 32
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I've had mine for while now and never had any issues. I admit that I don't dog it out, just smooth accelerations to top end runs. The flex shaft is pretty beefy so I'm a little surprised that it's breaking the way your describing. Did you ever balance the props? Any weird vibrations when you throttle the boat up out of the water? -
As Jim described it to me, the reason is that a short cable isn't going to 'shrink' as much, whereas a longer cable would 'shrink' more. As an example, I have three boats of approximately the same length (33-36"), all using flex cables of the same thickness...but having different flex cable lengths. The longest is 240mm, the shortest is approx 100mm, and then other two (for a twin-powered cat) are in-between at 175mm (these are just the lengths of the flexible portion). With the cat, the gap is approximately equal to the cable width. With the longer cable, I typically set the gap 1.5-2x the cable diameter. And, with my TFL Pursuit w/ Integrated Drive (the 100mm cable), the gap is approx 0.5-0.75x the cable width. Jim is the one who originally helped me set them to "proper" distance...and, again, I trust his judgement.
~ More peace, love, and kindness would make the world a much better placeComment
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~ More peace, love, and kindness would make the world a much better placeComment
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Two things, a HD flexshaft from OSE will be much stronger than a stock proboat shaft and will probably fix the issue. Second, have you changed the motor position, that could affect the angle of the cable and cause it to breakComment
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I own an Impulse 32 for 2 summers now- -stock Spektrum ESC, motor, on 6s smart batteries. I broke the OEM flex shaft the second time out. Bought OSE's flex shafts and have not had a problem since.
I also meticulously aligned the shaft to motor collet; nearly perfect. I run 3 blade CNC's.Last edited by CJPB32; 05-15-2023, 11:08 PM.Comment
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