bow lift
 

is it possible to get more bow lift from a prop when I spin them in its 1.5 mph faster I really need a set of 29 p5 x,s

Yes, on twin engine applications spinning inward or outward will change the bow lift. That is why many step bottom boats turn props inward.

Thom

My boat is a little more than 1 mph faster turning in...in generates trim leverage

yes.. after suggestions from JT, KeithATL and Bblades... All mentioned running IN to get bow up and has different attitude running IN than OUT.

I have not finished my test yet with a load, but riding by myself and just over 1/2 fuel, it ran totally different. Rode higher up in water, bow was noticeably higher and took less trim to get bow up.

My 25p m+'s wouldn't trim very well OUT and would start to porpoise where with less trim it rides higher and responds better to trim IN.

We have the Patriot Poker run "next" weekend, so I should finalize my test then and decide which way to spin them.

oh, mine blows out turning with any trim setting neutral and above. Spinning in, the boat felt a lot more "fluid" in turns and didn't blow out. Blowing out in turns was a crazy/scary feeling, one that you can manage when anticipating it, but once we had boat traffic and it made for an awkward moment as it blew out trying to navigate thru some traffic/waves in a turn in the river. The falling sensation usually scares the passengers.. cons to 3 blade I guess

NOTE: I swapped props and swapped levers at helm (20 min job tops)
I did pickup some of my lost mph.. 3mph and about 400 rpms b/c I am able to trim out better now. Heat really took a toll on my boat this summer.. lost 800 rpms (gained 400 back, but need to lab them)

Every identical boat has its own personality.
Inward does leverage the transom more than outward rotation but backing up into slips can become a interesting prospect as well.

Brett

I hope to test IN properly on a poker run on the 14th. Looks like I will need labbing regardless, but since my boat blows out in turns spinning OUT, would labbing correct that spinning out? Or 4 blades the only cure?

Adjusting Lab recipes can aid in preventing blow out in turns. This type of adjustment can also lower top end rpm levels.

Brett

Ok.. thats easy.. I will need to keep IN, will know after this test with the 24p b1 next weekend.. feeling of blowing out was freaky, wife really didn't like it, Spinning IN felt very mechanical and fluid as I turned and laid the boat over.

You know everybody likes to say that about the handling, but I can control my boat nearly as well as a boat with IPS drives and a joystick, I can back up perfectly, walk it sideways, put it wherever I want. At the marina I back it onto the forklift where they pull it out of the water. It does handle different than when the props spun out but it is still very easy to control.

I agree with you, I think its skill set or comfort. I noticed that I only had less pull/thrust in reverse which i just had to apply some throttle. For someone that only uses the gear levers would just have to get used to compensating with throttle. I was using 3 blades, so we shall see how 4 blades respond. But still all about relearning and ease of operation. Out requires less work than In from my initial test. But if rideand speed is better, then I will leave them IN.

Trimming the drives positive will help with the poor docking traits of inside rotation.

Great trick!
I share that with customers as often as I can.

Brett

Well, I got to test 24p b1s extensively spinning in with a lot of boat traffic in large lake and narrow intercoastal.

Running in normal uncongested waterway was good, boat felt light and bow rode high with little trim needed to get it there.
However, with constant boat wakes following large group and as well as passing many small boats at speed 6-62 ish felt too loose. Evrytime I approached some wakes I had to keep tabs down a little to settle the boat.
Sort of feels like your held high in the middle of boat and it will teeter each way easily with any kind of off angle wave. Unlike the stability that OUT gives.

So I changed mine back, swapped props and controls back today.

I tried it and it works like a charm!

Why did you wait 2 years to tell us that! Huge difference.

you trim up to the limit???

that's pretty funny... When I spoke to Brett about spinning IN, he mentioned that right off the bat. something about while reversing, thrust hits transom more spinning IN I think...

I noticed it immediately as I usually back off the trailer.. dramatic reduced thrust spinning IN vs OUT..

Otherwise didn't have issues spinning boat around, just have a use a lil more throttle for me and it was fairly easy... then again, I am just learning twins..