a few questions for the prop guru's .
Over the last few months I have read a lot of posts on the internet where people have talked about having the LEADING EDGE of their props rolled/ cupped.
Many have said about it giving less slip numbers and better Holeshot, but losing a touch on the top end.
Some have said it did not lose on top end due to the slip figures dropping and the water not slipping off the prop so much.
So I am wonder if we take a propeller of say 13 x 20 with just trailing edge cupped and add a leading edge roll would this lower the pitch slightly ?
Also exactly what part of the leading edge is rolled to give the prop a better bite.
I have added cup to the tips of the blades to give a touch more bowlift and hopefully a touch less slip, for my particular prop I need to drop the slip dramatically.
Some people have for example had a OMC srx prop cupped on the blade tips and reduced slip by around 5% and gained more bow lift from the prop with no loss in
top end but dropped rpm by a couple of hundred.
I take it by cupping the tips adds a touch of overall pitch to the prop.
so here are a few questions I would like to know more about.
1/ Would adding a bit of leading edge roll drop the pitch slightly to bring back the rpm and give more bite on the holeshot ?
2/ would adding leading edge roll interfere with the prop running at a surface application , I.E not work at surface or be detrimental to oval speed.
3/ will a leading edge roll make the prop lift the stern or lift the bow.
4/ what are the downsides to having this roll on a prop be .
There is obviously a lot more to this adding cup/rolling the leading edge, but not much information as to what the effects are and where on the blades exactly is the roll put.
also is the roll on a stainless put there by cold hammering or would it need to be heated to do this type of thing.
I know this is a bit of a mix of questions, basically I need to understand a bit more about what this rolling of the leading edge will actually do.
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