fixx
 

i already mentioned that to him and a smaller diameter prop with your adaptors with the -3's...in one ear and out the other..Some people would rather have it look pirty then have it perform..me paint everything black and fine tune it and lets go boating..

I do! sorry to hurt feelings but sometimes things need to be said..

I believe the 1.36 spins appox 400 rpm faster at 6k then the 1.50, I won't worry about the heat, I run 1.36 with showers no discoloration, This along with Prop Labbing has and always will be trial and error situation. Good luck Keep us posted on the results.

i stand corrected.:party-smiley-004:

my deleted post was a wise crack about riverrat ,and it is now just like him,gone!:lolhit:

In all the ones that I have swapped gears in, the 1.34-1.36 does lose a little acceleration as compared to the 1.5. I only change the gears when we just flat out run out of prop. If you can run 1.5's, then I would run them.

I'm in agreement with Joe that an SCX/SCX-4 (depending on X dim.) with a #6 prop shaft would be the way to go. We have done it on a few 42's and they really seem to like it.(again, depending on X dim.) I'm in the middle of dialing one in now. It has an SCX -4 running 17 X 36 5 blades. It was a little to high, along with a few other issues. We've tried a few different spacers to get the X correct. Now that the X is where it needs to be, we are playing with props. If it ever stops raining, we may get to run it.
Eddie

Hey Eddie , you've done a lot with the 42 beakers; what have you found to be a good shaft height relative to the bottom??

Joe

You mean prop shaft height. :party-smiley-004:

With a full stagger and #6 props, about 2" - 2.5" above the bottom seems to be the spot to be.

THe one that I have here now was quite a bit higher than that. The owner installed a -4, so it was ike 4.5" above. The boat got on plane just fine, but wouldn't carry at all. The slip was near 30%. He installed a 1" spacer with little change. I took it out with the 1" and the boat would make a SHARP right turn at 105-110 because it was unloading one of the props. Talk about scare the crap out of you. We almost got pitched out the first time it happened. I then removed the 1"spacer and installled a 2". That put it at about 2.5" above the bottom. It was a totally different boat then. I'm waiting to try another set of props with less rake. He has 18* rake props and it doesn't seem to like them. I found a set that are the same size with only 16*, so I want to try them.
Eddie

I know a lot of time the 1.36 is used to cure the "running out of prop" issue but doesn't the 1.36 also help reduce the stress on the drive and make it live longer behind bigger HP? I have a 1.36 drive behind my 22 Velocity and its not really needed but I had it and it pulls pretty good with a 24 Bravo. I still have the 1.5 drive that came on the boat and after hearing what everyone is saying I am thinking about trying it this summer with a different pitch prop to see how it affects my top speed. So far with the 1.36 drive at 5270 rpms I have run 77 GPS mph. If I can run a 1.5 drive and get the same style prop to get me to the 52-5300 rpm range will I pick up more speed? My boat gets on plane easy now with 450 hp and the 1.36 drive so planing is not a issue with the 1.36 for me.

I need to measure Joe's. His hull is a 96. I told him 1,2,3,4'' shorties don't really mean anything, as its all about where the shafts end up relative to the bottom. I'd imagine his drive height was rigged more conservative than say a 2006 42.

I don't really like the idea of going to high with the bravo style props. With a -1 lower, if the numbers he gave me are true, then his slip is good at 10% with a 4 blade bravo. Almost too good to believe. We'll see come spring.

That's scary aeriating a prop at 110mph! Do you think the bullet was skating on top at that speed? :eekdrop: