# Thread: FYI On "Prop Bending"

1. ## FYI On "Prop Bending"

I spoke with GP From Skat Trak about getting my prop repitched and told him about how Jerry is adding 3mm to the trailing edge for the "Modified" skis and asked him if there was a way to transfer this to a pitch number.

His replay was "Yes that is easy it is a 15/20.5"

So by that figure 1mm is equal to 1/2 of a degree in pitch.

I figured some of you might be interested.

Mine is headed out to go to a 15.25 or 15.5/21

Also I believe he said that the 14/19 3 blades started life as a 15.5/21.

2. now ya see thats what i thought but jerry says thats not the case....i would think that bending the prop would change the degree of the edge which is what the numbers stand for

3. GP is a cool Dude! Thanks for the info!...PR...

4. Originally Posted by 1 FAST VE
I spoke with GP From Skat Trak about getting my prop repitched and told him about how Jerry is adding 3mm to the trailing edge for the "Modified" skis and asked him if there was a way to transfer this to a pitch number.

His replay was "Yes that is easy it is a 15/20.5"

So by that figure 1mm is equal to 1/2 of a degree in pitch.

I figured some of you might be interested.

Mine is headed out to go to a 15.25 or 15.5/21

Also I believe he said that the 14/19 3 blades started life as a 15.5/21.
with jerrys bending of the trailing edge it is just to fine tune the rpms of your ski, the pitch is from the top to centre of the prop the bending of trailing edges is just a good cheap way of controling our rpms

5. Most of the 3 blades all have the same blade angle.
Just as the guy that builds that props says.

Bending the trailing edge changes the degree of the prop.

I understand he is "fine tunning" he is doing it by changing the degree of the prop.

I asked the same question a few times and got a few different answers so I went to the horse for the "end all be all answer".

You can not change the root angle of the prop but if they are all the same then this rule applies.

I would guess that other props or even Skat's prop with different root angles this rule may not apply??

6. Fast what mods do you have? I added 2mm to my B-kit Riva ECU set up.
I hope this is enough.

.

7. I have been keeping it pretty quite, but one of the big ticket items is well sort of like but not really the same as an ems system.

8. Originally Posted by 1 FAST VE
Just as the guy that builds that props says.

Bending the trailing edge changes the degree of the prop.

I understand he is "fine tunning" he is doing it by changing the degree of the prop.

I asked the same question a few times and got a few different answers so I went to the horse for the "end all be all answer".

You can not change the root angle of the prop but if they are all the same then this rule applies.

I would guess that other props or even Skat's prop with different root angles this rule may not apply??
i'm sure jerry will correct us on this one

9. but he is only changing the last inch the rest of the prop is untouched.

My theory is since it is just a small portion that is changed it remains essently the same pitch. Other impeller benders like to change the whole blade to a desired pitch

I dont know the answer but a pro converted jerrys 2.5mm tweak to a 15/21.5 when I sent it to him after rock damage and I lost 700 rpms so he is puttin it back to 15/19.

I mean no disrespect to the pro..just trying to figure it out

10. Originally Posted by 1 FAST VE
I spoke with GP From Skat Trak about getting my prop repitched and told him about how Jerry is adding 3mm to the trailing edge for the "Modified" skis and asked him if there was a way to transfer this to a pitch number.

His replay was "Yes that is easy it is a 15/20.5"

So by that figure 1mm is equal to 1/2 of a degree in pitch.

I figured some of you might be interested.

Mine is headed out to go to a 15.25 or 15.5/21

Also I believe he said that the 14/19 3 blades started life as a 15.5/21.
Yup, That's what I was saying in another thread. Bend the trailing edge, your changing the pitch. To be honest I thought 1mm was almost 1 degree in pitch.
You don't have to change the leading & trailing at the same time to "change the pitch".