I've printed the V2.0. I found this axle joint to be a bit too thick or it's not slopped enough and the rubber band is blocking against the body of boat. I have to push it more to the sides, so it's wind up more on propeller axes than on the joining part. All in all, my kids will have fun, thanks!
RuBoat - Rubber Band-Powered Bath Toy
Bath toy that combines the excitement of a racing boat with the wonder of physics principles!
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March 2, 2024
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I couldn't quite figure out how to work it but it's a pretty cool model none the less I printed in some pla and it looks pretty good.
Prototype printed in PLA (Body) and PETG (Axle, Wheels). Works fine, but the rubber band I found gives it a big boost at the start, but doesn't deliver it over a long time.
@TomasSmolik_1005307 This is due to the principle because no tension can be applied to the rubber band that is already wound up. Thus, only the remaining portion of the rubber band is stretched, resulting in very little energy being stored, and the force quickly diminishing.
@uhltimate_548874 You are absolutely correct! What I meant is that different bands will perform differently, based on length and flexibility.