changing propeller rake?

[fs5]

is it possible to change the rake of a propeller?
thaks.

[phillnjack]

Surely to change rake you would have to take the blades off and weld them back on !!!!
or get say a 15 inch diameter prop and have it taken down to about 12 to alter the rake.

Sounds like something a specialist may be able to do ,but would probably cost twice what a new
prop would, as need to do more than twice the normal work on the prop.

ofcourse i might be wrong, but isnt rake the angle of the blade attached to the hub ?????


phill....

[Fast Fred]

i've never heard of changin the rake, pitch yes. just so we're talkin about the same thing, Rake is the angle that the blade leans back from straight up and down.
like a sail boat prop has zero rake at what ever pitch, no lean, looks like a fan.

[Fast Fred]

cup goes along way on that style hull in your avitar fs5

[phillnjack]

Yeah fast fred your right.
Rake is blade angle from hub.
it would definitely be a challenge ha ha ha
probably been done on very exotic stuff where originals aint around anymore.


phill

[Mark75H]

Yes rake can be slightly altered ... just like pitch. Neither can be altered very much on any particular prop.

[Fast Fred]

is the gain in rake the out come of like addin more pitch or cup, or is it outright spank 10 more deg' into it, from say 30 to 40 deg'?

[Mark75H]

Yeah, like adding cup

[fs5]

thanks for the replies,i need a bit more rake to hold the bow up a bit.i wasn't sure either if you could just change it like the pitch.
the cleaver i'm running is one of ron's 11x20p over hub props.it has very little cup on it so i might try that first.

[phillnjack]

so you need to have all the blades bent or taken off and replanted /
i could understand this with maybe an ali prop as the heat could help bend the blades, but to do a stainless
i would of thought would be very difficult and very dangerous,especially with a moulded prop,and expensive.

be interesting to hear what a prop maker would say about this .

phill