Vibration

[Randall]

Hi there!!
Just joined as finally found a hobby I love.
I built an areonaut Diva and very pleased with the results however after completing decided to remote control it. I now realise my mistake
All ok apart from the propeller shaft and the motor do not line up perfectly
I have added a universal joint 1mm-1mm so all running but the vibration and noise frightened my dogs let alone the ducks
Any advice
Any next build is the Occre Ulisyses so better luck next time

 

[swampdweller126]

Hello and welcome to the forum, from NY

 

[Corsair]

2 different things I can think of that might help the noise and vibration. If you only have a single Universal joint, add a second one. This will help if there is an alignment problem in addition also an angular problem. The second option you might try is instead of a U-joint. Use a piece of rubber tubing between the 2 shafts with a gap between the shafts. Also, make sure you have a lot of grease in the tube the prop shaft goes through.

I think it's going to need some trial and error.

Best of luck !

 

[Roger Pellett]

The propeller itself may be vibrating. First it should be balanced. A blade heavier than the others can cause vibration. Also, if the propeller is turning too fast it can cavitate. This occurs when the pressure behind the blade drops to the point where the water vaporizes.

Propellers are tricky and must be matched to the specific application including boat speed, propeller RPM, diameter, pitch, and number of blades. If your model was built from a kit, and the supplier just included a generic propeller this might be your problem.

Roger