[C320-list] High pitch whining (singing) noise from shaft above 2800

[Chris Burti]

Try dulling the leading edge of the prop slightly with a file. 

Best Regards,
Chris Burti

> On Jun 19, 2017, at 4:51 PM, danny jensen <danny at jensenshouse.com> wrote:
> 
> I have hull 972 with new shaft,strut  and stuffing box about 4 years ago.
> Cutlass was replaced about 5 years ago.
> 
> When I run above 2800 the singing starts.  Then at 3100 it stops.
> 
> I've got GFO standard packing and the noise is not coming from stuffing
> box. Only happens in gear. It Didin't sound like if was from transmission.
> 
> If the prop hits a chunk of kelp, this fixes the problem for a while and I
> don't hear any singing.
> 
> Any clues?
> 
> Danny
> #972