cfischer

Testing the 20' for a second time tomorrow with different prop. New heads and valve springs! Motors running great! Running 75mph with 23 3 blade at 4500 rpms so dropping to 21 3 blade. Should be running around 5600 rpms. Still have to getting her trimmed out. Supposed to be only 50 degrees tomorrow so should hit a good number!!

JohnnyMarshall

Lookin good, what size motor is that? Are u gonna make the LOTO 20 Regata run this year? We all need to meet up including BLee. Congrats, Ill post some updates on mine as soon as i get it done.

rchevelle71

iTrader: (1)

What gear ratio, I find it hard to believe 75 with a 23 at 4500???

rchevelle71

iTrader: (1)

Here are the #'s from the prop calc, you would have to be running a 1.25 ratio drive, with 4% prop slip, nearly impossible.

rchevelle71

iTrader: (1)

Also, how does dropping one prop size(2") add 1100 RPM??

cfischer

Do I know you??

cfischer

I am curious to know what you might think I need? I was running along side my buddy in his 16 Donzi and both GPSs were at 75mph. I don't know what gear ratio I have in my TRS?? I running around 525hp on a TRS and mabe my rpm gauge is bad but I should be running around 5500 all day and easily in the 80's. Any help would be appreciated. Not really familiar with the gear ratio in TRSs.

CIG3

I would assume the ratio is 1.5:1 with a 1:1 tranny.

Cash Bar

CJ, Rick is good people, I'm sure he didn't mean anything negative.

And that's a nice 20' my friend.

rchevelle71

iTrader: (1)

Thanks Greg,

I just wanna know what his formula for getting his 20 to do 75 at 4500 RPM, cuz, I run 5400-5800, and can only get 60 with the same prop?? I realize my 24 may be a little heavier, and I run a 1:75 gear, but I have tried everything, and cant get this pig over 60, his slip seems awful low. Think about it, we only ran 78 on a GREAT day in Tims 28, with 830 horse at 5250 running 28 Bravo's.