Prop shaft alloy

[restlessnic]

Am looking at a brand new (Sept 07) Dufour 525 with a sheared prop shaft. The colour and sound of the shaft (when struck with a steel knife) are definitely not those associated with stainless steel. Anyone know about new alloys being used in the manufacture of prop shafts?

Thanks.

[GordMay]

Two proprietary shafting trade names are:
Aquamet Marine Machining & Manufacturing - Home
Hastelloy Haynes International, Inc.

[irwinsailor]

This place makes the shafts for Tiara yachts. I had them work on my prop shaft and can highly recommend them.

Paramount Tool Inc. - Machine Builders

[GordMay]

See TABLE I - EXAMPLES OF SHAFT MATERIALS (page 6) of:

ABYC Section P-6 “PROPELLER SHAFTING SYSTEMS”

https://www.abycinc.org/committees/P-06.pdf

[restlessnic]

Thank you all. The vessel is a French built 52' monohull built in September of 2007 with Volvo 110hp diesel and Volvo 4-blade folding prop. Owner states that the prop was not fouled but that the shaft snapped when the engine was put in reverse at full throttle to help free vessel from a reef (very little damage to the keel so was not considered to be a hard grounding). Once I am certain of the alloy used, will post for anyone who might be interested.

Thanks again.