Are DPV noisy ?

[Andrew Donn]

The reduction gears (and maybe the motor) are the source of the noise. Better isolation of these elements from the hull ("tuned" vibration attenuating mounts etc) are likely a more effective means of reducing the noise transmitted. This of course gets tricky when the prop shaft penetrates the same hull.

Tobin

That is right. It didn't help on the farallon that the motor is mounted directly to a stiff aluminum plate that is bolted directly to the tail and of the hull. The gear train went from the shaft to the bearing to the hull as well so no isolation there.

 

[REVAN]

Helical cut gears will be much quieter than straight cut gears. This is why a car will make that loud winding noise if you get the speed up while in reverse, but it is quiet in the forward gears. Reverse uses straight cut gears to keep the manufacturing costs down.

Do current DPV's with re-drives use helical cut gears? If not, using them will be one way to get the noise reduced.

 

[lucca brassi]

I just want mentioned , but REVAN was faster .. ''Helical cut gears will be much quieter than straight cut gears.''

that is well known from , special from rally cars because of ''short gears '' that straight cut gears ''rattling''

The reduction gears (and maybe the motor) are the source of the noise. Better isolation of these elements from the hull ("tuned" vibration attenuating mounts etc) are likely a more effective means of reducing the noise transmitted. This of course gets tricky when the prop shaft penetrates the same hull.

Rubber Buffers | Anti Vibration Mounts by GMT Rubber-Metal-Technic

I think propeller is not so ''loaded '' to use otherwise some ''Flexible Clamp Shaft Plum Coupling''
could be used