Props / RPM / Slip
#1
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Props / RPM / Slip
I've got this in Tech forum to, but thought I would throw it out to the Fountain owners that might have already gone threw this.
Julie, and anybody else sharper than I please chime in. The more I searched the more confused I get. Here is my situation:
05 35 Lightning / 500 EFI's / Bravo 30's / inward rotation / 1.5 XR's
Slip calc (if done right):
WOT is 5000 rpm X 30P=150,000 / 1584 = 94.7 x .89=84.3
I am getting 84 on gps with 8.9% slip.
I cannot get any more rpm no matter trim/tab combo. I am fine out of the hole (I baby the drives) but would like 200 more rpm and better midrange.
Should I jump to diff pitch or look at having Throttle rework Bravo's
Julie, and anybody else sharper than I please chime in. The more I searched the more confused I get. Here is my situation:
05 35 Lightning / 500 EFI's / Bravo 30's / inward rotation / 1.5 XR's
Slip calc (if done right):
WOT is 5000 rpm X 30P=150,000 / 1584 = 94.7 x .89=84.3
I am getting 84 on gps with 8.9% slip.
I cannot get any more rpm no matter trim/tab combo. I am fine out of the hole (I baby the drives) but would like 200 more rpm and better midrange.
Should I jump to diff pitch or look at having Throttle rework Bravo's
#4
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Re: Props / RPM / Slip
Then the easiest (and cheapiest) thing to do would be to have your current props labbed, you should pick up 200 rmp or better - and probably a couple mph - if not better. I think most 35 two steps with 500 efi's run around 86-87 out of the box. Those XR's might be costing you a mph, but you should be doing better than 84. Your current props might really be out of balance. Lab and BP those puppies and see what happnes. Then go from there.
#5
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Re: Props / RPM / Slip
I have 2001 35 twin step,with stock 30 bravos 82 - 83 . After lab finiching ran 84_85 5400rpm. Through the bravos on ebay and get Maximus 30 pitch 5 blade props ,They have to be labbed and will not be any faster but bottom and midrange is worth every penny. I gained 13M.P.H. at 3200. Great for cruse and engine life.