Left hand and right hand on single drive and on twins rotating in / out is Left hand on one drive and right on the other, and visa versa (LF/RT or RT/LF) Clear as mud.

Try to stay below 32" of pitch. If you can do that with a 1.5 ratio, then your decision is made.

When turning props inward....you need to take it slowly, initially. The boat may handle differently so test with caution. Some vee bottom boats tend to get light in the stern when turning inward. You may or may not see any speed increase, as this is boat specific.

Outward rotation= RH prop on Starboard Motor
LH prop on Port Motor

Inward rotation= LH prop on Starboard Motor
RH prop on Port Motor

When running props in opposite rotation, with Bravo drives put the shifter in reverse to go forward and forward to go into reverse......Be careful and cognisant when attempting this test!


Safe Testing!

Matt

chris, nice talking with you tonight and I will call you when the props get here,again Thanks for the phone call and good to do Business with you ,we will get you hooked up.

My last boat was single engine cat running about 800 hp with a high X. Speed was approaching 110 mph.

I started with 1.50's and a "worked" 32" prop. The boat was very hard to get on plane due to the slippage. Once on plane the setup worked great, and accelerated hard.

I decided to drop to a 1.36 ratio to avoid the planning problems. I was able to drop down to a "worked" 30" prop with the new gears, and the boat jumped right on plane. I did lose some mid range acceleration though as a result of the gear change.

That was my experience, not sure how it corrolates (sp) to your setup. Good luck.

Did you lose any top end?

Not that I could tell. The numbers were about the same on the top.

I have seen similar results with other cats. With such low drag the gear ratio is not so important especially if you already run 110mph.

On V-hulls gear ratio seems to make a much bigger difference. My boat is a great example, 1.5 ratio=5mph more top speed.

That is interesting. If it were not for the problems I had planning the boat, I would have switched back to the 1.50's. The mid range acceleration was much better with them.

Almost no one will argue that acceleration with 1.5 is better, but if planning is a problem the 1.36 should help a lot.
Just goes to show you can't have your cake and eat it too.