ratedx

07 38 lightning 525's xr's sportmaster its gimbals. Drives are little higher for top end- having hard time getting up on plane -running 7 blade herrings- i did just have botttom of boat waxed- on board 4 guys w/average weight of 225 pounds and 3/4 tanks of fuel. any suggestions?? i was told that spacers are going to kill top end! how much? thank you

4bus

iTrader: (4)

When you say a hard time, are you blowing the props and cavatating or having trouble getting rpms out of those 7 blades out of the hole?

ratedx

yes-blowing props and cavitating!

TRL505

Higher X = sacrificing hole shot. A 1/2" spacer would help....but more than likely will affect top end by a few MPH. How far is center of propshaft above/below bottom of boat?

Maybe R3 will chime in here..

ratedx

according to test run x-dimension is 22 1/4 x 18 1/2 - is that info any help?-i have no problem sacrificing 3-5 mph to help get up on plane test sheet =97mph.

JMPH

iTrader: (1)

getting on plane is a little differant than a side by side, once you've done it a couple times you get used to it.

ratedx

what size spacers should i use? i was out for first time-got it to plane once but after that could not get it again-any suggestions on where to purchase??size??

mcprodesign

you could put extended hubs on the props that you have now. or you could try a different set of props like some 5 blade maximus if you're not concerned about the top in number being a few miles per hour slower

ratedx

props that have been used in the past have thrown blades-because of high x dimension! these 7 bladers are the only ones that stay together. What size spacer? brand?

TRL505

Did you try this:

1. Drives tucked and tabs at 5.5-6
2. Run boat up to approx 3200-3500 rpm's...it should still be hooking and gaining speed and beginning to try to plane.
3. As boat picks up speed (17-19MPH) gradually start bump up tabs till it breaks over....gradually apply throttle to about 4000rpms till it fully breaks over and hooks.

It takes our 42 a LONG time to get up on plane...lol.