06-11-2014, 08:45 PM #1
do you guys pitch your own leading edges?
I bent my 15/20 too many times and one of the blades broke last time out. My spare prop was pitched by SF's and currently at 12.5* on the leading edge. I have bent trailing edges many times before but never leading.
is this something you guys do yourselves? or send them out? anything different about it?
on a side note, how many time can you pitch a prop before its compromised and prone to breaking?
06-12-2014, 06:50 AM #2
06-12-2014, 07:16 AM #3
If you send it to someone like skat or impros or jim they'll use a pitch block. You can do it good enough yourself.
06-12-2014, 03:11 PM #4
I take it that you do it the same way as the trailing edge?
06-12-2014, 03:33 PM #5
Ive pitched a ton of local guys props and some turbo guy's on here's props as well. its not that bad. the more you do the better you'll get.
06-12-2014, 08:48 PM #6
Are you not happy with the 12.5 leading edge that SFR did?
My favorite go to impeller has always been my old Solas SRX 15/22 that SFR pitched to 12.5/19 with setback and the 87mm nozzle.
06-13-2014, 11:27 AM #7
My boat burned the SFR prop out of the hole bad. it was a 15/21 srx that they pitched to a 12.5/21.5. ran 80 @8300 with a 81ring. I took the trailing edge from the 21.5 to 19 to get the rpms up. it ran 81-82 @ 8600. but it would bang the limiter 6-7 times before it hooked out of the hole.
I tried a 15/21.5 that a friend let borrow and it ran 80@8300 and hole shot was miles better. it hit peak rpms and hooked. I bought a 15/20 (15/17 true) off a forum member and bent it a couple times to wined up at 15/18 for 8500 on a 90*day then it broke.
hope that answers your question.
06-13-2014, 12:58 PM #8
Sure does. I have had similar results but I have found with my ski the following. The smaller nozzle sizes like 83mm and less are great for top end speed BUT cause a much poorer hole shot and acceleration. The larger nozzle size of 87mm has an incredible hole shot and acceleration but is 1-3 mph slower on top.
So bottom line, what is your real goal? Max top end speed? Better hole shot / acceleration? or all of the above? If you want overall performance I would suggest pitching with the 83mm nozzle to keep rpms 100-200 rpm below your set limiter.
I believe your cavitation on hole shot is due to the small 81mm ring, you can't process and move the water thru the pump fast enough due to that tight ass nozzle opening.
Try the 12.5/19 with a 83, 84, 85mm ring and watch what happens.
06-13-2014, 10:31 PM #9
this is what I have found. with the SF prop 81mm was best for top end worst for holeshot. went bigger to an 84 and holeshot got better but still hit the limiter a bunch. lost 1-2 on top and rpms stayed the same.
with the 15/19, both topend and holeshot was best with the 81 ring. it hits the limiter and sticks there as it pulls out of the hole, no rebounce. go to 84 and it loses on top and bounces out the hole but rpms go up on top.
I could just tell the boat was asking for more prop when running the SF.
06-14-2014, 01:06 AM #10
Mibunkerking I will meet you at ft George my go pro is setup on the rear seat I will help you gauge your leading edge based on how far your behind me
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