prop bending 101

[munther abdulla]

i think you better to make a video for that

[sv650k4]

awesome this work great for me thanks Duke

[mikeFZR]

I use the bottom of the blade to match the line on the gauge best. Use at least the last 2 to 2 1/2" of the blade. I measure up from the edge and mark it 2.5 inches with and felt marker then find the line on the gauge that matches closest to the bladefrom my mart to the end of the blade. Then I go on the gauge one line less and one line higher just to be sure I have the best gauge line that matches cloest to the blade. then this is the pitch of that blade on the leading edge. repete process on the trailing edges to record there pitch. I number all 3 blades and check each blade for exactly what it's tru measure ment is it is not uncomon the find one blade that does not match the other two. I also find waves in the blade in this last 2.5 inch aera and I tru the waves up till the blade follows these gauge lines matching exactly to the line. Tommy Jordan

Thank you. Time to mess with my prop!

Leading edge is a little different than trailing edge. You want to place the prop in the gauges and mark the point where the leading edge first touches the gauge-- then you measure back approx 2 inches and that is where you want to bend.

Trailing edge you just use the last approx 2 inches of the blade.

[krouchchocolate]

I use the bottom of the blade to match the line on the gauge best. Use at least the last 2 to 2 1/2" of the blade. I measure up from the edge and mark it 2.5 inches with and felt marker then find the line on the gauge that matches closest to the bladefrom my mart to the end of the blade. Then I go on the gauge one line less and one line higher just to be sure I have the best gauge line that matches cloest to the blade. then this is the pitch of that blade on the leading edge. repete process on the trailing edges to record there pitch. I number all 3 blades and check each blade for exactly what it's tru measure ment is it is not uncomon the find one blade that does not match the other two. I also find waves in the blade in this last 2.5 inch aera and I tru the waves up till the blade follows these gauge lines matching exactly to the line. Tommy Jordan

Thank you. Time to mess with my prop!

[2fast4u]

I use the bottom of the blade to match the line on the gauge best. Use at least the last 2 to 2 1/2" of the blade. I measure up from the edge and mark it 2.5 inches with and felt marker then find the line on the gauge that matches closest to the blade from my mark to the end of the blade. Then I go on the gauge one line less and one line higher just to be sure I have the best gauge line that matches cloest to the blade. then this is the pitch of that blade on the leading edge. repete process on the trailing edges to record there pitch. I number all 3 blades and check each blade for exactly what it's tru measure ment is it is not uncomon the find one blade that does not match the other two. I also find waves in the blade in this last 2.5 inch aera and I tru the waves up till the blade follows these gauge lines matching exactly to the line. Tommy Jordan

[krouchchocolate]

When you measure the leading edge, is it also the same method? From the tip of the blade to about 1 1/2" - 2" then try to find which one matches close to the gauge? Will I be comparing the bottom of the blade or the top of the blade when comparing the leading edge to the pitch gauge?

[prostocker]

I want buy a gauge prop for seadoo 140mm ? How much

$50 its on my signature pm sent

[modblaster]

I want buy a gauge prop for seadoo 140mm ? How much

[Speedling]

Is cavitation during the holeshot best adressed by increasing the leading edge pitch? And, if the leading edge pitch is increase by 1-2*, how much effect will it have on decreased peak rpm?

Well, are you having cavitation ONLY on hole shot, or all the time? You can degrease the leading edge to get a better hole shot I beleive. Meaning, going from say a 14 leading edge, to a 12, would/should give more bottom end.

[Just-Pinch-It]

Is cavitation during the holeshot best adressed by increasing the leading edge pitch? And, if the leading edge pitch is increase by 1-2*, how much effect will it have on decreased peak rpm?

[WFO]

Figured I would post this question here instead of creating a new thread....
Why would the dynafly impellers be any different than the rest when it comes to the repitching?
I have a 14/20 dynafly, and I was going to be moving it to a 14/21, or 14/22. Is this little enough to not worry, or am I messing with things I shouldn't?
Thanks guys!

Dynaflys grow in diameter when pitching trailing edge up, so the diameter must be re-cut for clearance. When de-pitching they will pull away from the liner, and usually involves rewelding to get air gap correct.

Before pitching you should get good baseline rpms numbers

I think I understand.... Adding pitch should be ok if it doesn't rub. What I don't understand is why would other impellers be fine and this one isn't.

As for the RPM's, I have one engine at 10,200 rpm and the other at 9800. I plan a couple more small mods to see how it runs, but was hoping to get them to redline, then pitch it a bit more for the speed.

the root on the Dynafly is different from other solas impellers... if you pitch up correctly, you will have to cut the diameter

[Speedling]

Figured I would post this question here instead of creating a new thread....
Why would the dynafly impellers be any different than the rest when it comes to the repitching?
I have a 14/20 dynafly, and I was going to be moving it to a 14/21, or 14/22. Is this little enough to not worry, or am I messing with things I shouldn't?
Thanks guys!

Dynaflys grow in diameter when pitching trailing edge up, so the diameter must be re-cut for clearance. When de-pitching they will pull away from the liner, and usually involves rewelding to get air gap correct.

Before pitching you should get good baseline rpms numbers

I think I understand.... Adding pitch should be ok if it doesn't rub. What I don't understand is why would other impellers be fine and this one isn't.

As for the RPM's, I have one engine at 10,200 rpm and the other at 9800. I plan a couple more small mods to see how it runs, but was hoping to get them to redline, then pitch it a bit more for the speed.

[WFO]

Figured I would post this question here instead of creating a new thread....
Why would the dynafly impellers be any different than the rest when it comes to the repitching?
I have a 14/20 dynafly, and I was going to be moving it to a 14/21, or 14/22. Is this little enough to not worry, or am I messing with things I shouldn't?
Thanks guys!

Dynaflys grow in diameter when pitching trailing edge up, so the diameter must be re-cut for clearance. When de-pitching they will pull away from the liner, and usually involves rewelding to get air gap correct.

Before pitching you should get good baseline rpms numbers

[fzs13]

Thanks for the info!

[prostocker]

Figured I would post this question here instead of creating a new thread....
Why would the dynafly impellers be any different than the rest when it comes to the repitching?
I have a 14/20 dynafly, and I was going to be moving it to a 14/21, or 14/22. Is this little enough to not worry, or am I messing with things I shouldn't?
Thanks guys!

What do you mean they are different ? at what rpms you are and what rpms are you trying to archive.