redfountain420s

what style prop works best on a old style fountain, 3 blade , 4 blade , hydramotive, bravo ? these boats have been around awhile so i know they been tested and hope you can point me in the right direction.
heres what it is
1988 fountain12 meter with 2000 hp500 efi long blocks with 420 mega blowers borg warner 72 trans and trs outdrives 1.50 ratio.
i got a set of hydramotive 25 pitch 4 blades on it for starters and finally got the motors running right. on flat water 1 ft chop at most i saw 72.6 mph on gps both motors running 5000 rpm but i have to trim it off the indicaters (too much transom lift ? ) ive seen 76 mph with star 5400rpm port 4600rpm on good water 2-3 fters before i fixed port motor (head gaskets)
i hope to get out on some good water this weekend and get better #s
thanks for any help Kevin

bbladesprops

You're not running too bad in the flat stuff. If you run the numbers, you'll see about 8% slip.

I'm surprised to see that with the trim you have to induce. Yes the props can create a lot of stern lift. Technology when the boat was built, was to use 3 blade props. TRS cleavers. I would stick to the 4bl props though. Try some Bravo 1's. They will help your trim issue if the Hydro's are Q4's.

redfountain420s

thanks for the reply bblades. the hydro's are q4s. I will try some bravo 1 s and i do want to stay with a four blade but our season is about over so i might have to wait till spring.
thanks again Kevin

bbladesprops

Let us know when you're ready to test and we'll see if we can get some props out to you.