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View Full Version : Help with prop for a 70hp omc on tunnel


8'aqualark
07-30-2009, 06:01 PM
I have a 13' tunnel with large sponsons.The boat weighs about 550 lbs. It looks like a little skater. It will turn a 20 pitch 6000 rpm, but it takes forever to get on a plane.I think i need a small over the hub prop with about 19 - 21 pitch. I've tried both pitch's, but they were thru hub exhaust and its takes a long time to plane down.I put a stock 17 pitch on it and it comes out of the hole good but then turns to many rpm's. Do they make a small diamiter with this pitch that might work???? It has a 70 hp johnson..1994 model ..Thanks
mr_velocity
08-02-2009, 12:22 PM
I run this Ron Hill / Leading Edge blue printed 4 blade on my Stinger. You can usually find them on Ebay, works ok until Rich at Leading Edge does his magic on it, then WOW. The boat is a 13' Funcat.
chipg
08-08-2009, 08:50 AM
What improvement did you see after having the prop worked? Acceleration, speed, etc.?


I run this Ron Hill / Leading Edge blue printed 4 blade on my Stinger. You can usually find them on Ebay, works ok until Rich at Leading Edge does his magic on it, then WOW. The boat is a 13' Funcat.
delawarerick
08-08-2009, 01:10 PM
Look for a small ear merc chopper and have it rehubbed they made an 18 and a 20 you will have to raise the engine and will loose some hole shot. Aqualark do you know where I can find an aqualark I have a 1957 18 johnson I want to mount on one. Rick
mr_velocity
08-08-2009, 02:52 PM
What improvement did you see after having the prop worked? Acceleration, speed, etc.?

Went from burning a 7000rpm hole in the water to jumping on plan. Better bow lift and a little on the top end.
HPShadow
10-02-2009, 06:16 AM
:confused:depend on the set up hieght of motor set up of boat tank and batt location cg on your equipment i would try cheap props before i spend money on a big dollor prop.
Air Dog
10-15-2009, 09:00 AM
What cheap props would you guys recommend I start with?

I have a 13.5' Jaguar with a 1988 Johnson 70hp standard shaft with no set back on the transom.

I was thinking a 20p, but do I try a 3 or 4 blade?

Over the hub or through?

Thanks,

:smiletest:
yam1979
10-15-2009, 04:32 PM
put a 6 'jackplate on it lowwater pickup 22 cleaver ron hill has props. setup setup setup
Mr.Rude
10-22-2009, 10:05 PM
Do you have the 2.42:1 gearcase ratio?
Air Dog
11-07-2009, 08:05 PM
Not sure what gearcase I have.

It is all stock.