In article , Ryk
wrote:

On Mon, 22 May 2006 02:02:50 +0100, in message

Peter Wiley wrote:

In article , Ryk
wrote:
Oh, and I agree with your other correspondent that pulling props is a
black art. I managed to deform the end of a shaft with a puller in the
process of tackling a prop change. Heat and well applied impact loads
seem to be important. I had no big problem removing the fixed prop
with about a 2 1/2 inch shaft contact, but removing the Gori folder
with more like 4 inches of contact was beyond me.

Why? Was it a very slow taper, or a straight shaft? With a long slow
taper I can see a wonderful wedging action happening when the retainint
nut is torqued up tight.

Standard taper in both cases. Both props had been installed for a
*long* time. My guess is that it was just a matter of surface area.

Likely you're right but if it was a std taper either the retaining nut
thread must have been a smaller dia or the shaft dia must have been a
lot greater. If it was the same shaft I don't see mechanically how it's
possible to keep the same taper as before.

It would be a good idea in this sort of situation to relieve the
central portion of the prop hub half a millimeter or so, to reduce the
metal to metal contact area. Easy to do while it's set up for boring
the taper.

PDW