Thread: Question on prop?
10-04-2006, 08:36 PM #1
Question on prop?
So looking at my prop i have a pretty big gap from the back of the prop to the vein section (when you screw the prop on it almost looks like it doesnt go on far enought) Is it worth my time to machine the back of the prop hub to close up that gap between the hub and vein section?
10-04-2006, 09:32 PM #2
Leave it alone, mine looks that way, I think a .080" gap(Don't quote me on that". I asked Kerry about this too and he said it should be that way. Starts burning up stators if you move it closer in his testing.
10-04-2006, 10:47 PM #3
So than what is "setting back your prop"? thanks
10-04-2006, 11:03 PM #4
machining the hub to move impeller closer to the vein section is indeed called a set back impeller
10-04-2006, 11:17 PM #5
so having a "setback impeller" will damage the stators/vein section?
10-05-2006, 06:08 AM #6
10-05-2006, 07:05 AM #7
Most people I have talked to say setting the impeller back helps prevent cavitation and burning the stator.
Mine has been set back for 30+ hrs of
riding and the stator looks like new.
Pulled the pump a couple a days ago
to try another prop.
10-05-2006, 11:29 AM #8
So for those who have done the "setback" did you see and improvement in acceleration or top speed? If the vein section becomes "damaged" can it be repaired or do you have to replace it?
10-05-2006, 11:43 AM #9
I have tested both setback and not Setback seemed to be a little better at of the hole but not enough to justify the burning up of the veins on the 05 pump. The older pumps I didn't see this I have run the same top end speed numbers with prop real close to the veins and as far back as a 4mill gap. Now some boats with out some motor work you can get away with the setback for a little better hole shot
10-05-2006, 12:30 PM #10
Kerry, didn't mean to sound like I was replying to your post. It popped up while I was typing. I was looking at his signature and figured he was close to the same power as me. Also have 05 pump as well. Surely when you start making big power with tripples and big blocks things change dramatically.
I've seen race motors take stainless Skat pumps and bend all the veins staight!!!
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