Spin props in or out?
 

To all you outboard cat guys, do you spin your props in or out? The boat I just got has the props spinning in .I have not run the boat yet and I'm currently doing the water pumps , I the lowers off, .so before I put hem back on I want to see what you guys are doing and what you think.. The boat is a 2000 30 ft Motion cat with 2.5 RO's with 15 mids on jack plates . The lower ratio is 2 to 1 and I will be trying 15X32's 3 blades. Thanks , Tom

:drink:

Re: Spin props in or out?
 

in for flat water, out for rough water

Re: Spin props in or out?
 

Tom, try it both ways. Personally from what I've read and felt in boats, I'd spin them out for everyday use. Spinning in might give you an extra one or two MPH at the top end but you might give up low speed handling.

Whichever way made the hull lean into turns would be my pick.

Re: Spin props in or out?
 

Get hold of Mmwalters. Michael has the same boat with 300s, and history of running both in and outbound

Shawn

Re: Spin props in or out?
 

I agree, out on most cats helps with the handling, in may pick you up a few MPH.

Re: Spin props in or out?
 

Tom,
For overall handling, spin them out. You will probobly pick up 1-2 mph spinning in, but it won't handle as well.
Can't wait to see this bad boy! :D
Dean

Re: Spin props in or out?
 

Tom, O/Bs may be different thatn IOs, but I spin my props inbound and have NO issues with handling at low, mid or WOT. 36 Spectre with HP500s handles like a dream around the docks.


Shawn

Re: Spin props in or out?
 

Spoke with Jay at Spectre about this subject. He said there was no speed to be gained on my 30 with 2.5 efi's by spinning in unless you change the distance between the engines. It had something to do with the position of the prop compared to the sponson. :cool:

Re: Spin props in or out?
 

It all depends on the boat and your set up.
My Talon with 17.5 d 37 pitch 5 blades #6 dry sumps at 115mph or so when turned out got very very light in the rear. We turned them in and at 125+ she stays planted just like being on rails, its night and day better handling on our Cat compared to turning them out.. I would suggest switching the drives and see how she runs, I'm glad I did!

Re: Spin props in or out?
 

Can someone pass the popcorn? I need to be ready when T2x offers up another physics lesson! :D

Tom, how are you? It was nice to see you at the NYC Poker Run. Next time you're coming to the city, email me. Valentina (my girlfriend) and I can meet you for a drink.

Re: Spin props in or out?
 

I can tell you turning them in on a 28 Skater really lifts the boat out of the water. Today I saw 2 28's run, both were turning in and extremely high in the air. They both said it is faster in. I have personally never spun my props in on my 28. I might give it a try to see of any speed to be had.

Re: Spin props in or out?
 

its hard to argue with the laws of physics...

Re: Spin props in or out?
 

Miller, I might be in NYC this week as Barbra has to stay there 3 days for business meetings . If I get a chance I might go in and spend the night. If I do I'll shoot you an e-mail. Tom

Re: Spin props in or out?
 

My last three O/B cats ran much better all around turning in. Try it both ways. It only takes minutes to swap lower units. If it works better than just switch the throttles to reverse the throws. 2:1 ratio? For offshore racing they use that ratio for coming out of the corners. But, all around use may spin the rpms too much.

Re: Spin props in or out?
 

I'm leaving for Florida later today. I'm down there until Thursday for a series of meetings at my corporate headquarters. If you're in the city on Friday, I plan to be back. Otherwise, you're going to miss me. :( But, if not this time, we'll definitely get together the next occassion you're in the city for. :cool:

Re: Spin props in or out?
 

Brad ,what kind or rpms do you think it will turn with these wheels? I bought the boat from the bank so I have no info from the previous owner. I did not know the ratio till I dropped down the lowers . The 15 X 32 's are the only wheels I have available right now .I should be testing it later this week.. I think the boat might have been raced a
couple of times. Tom

Re: Spin props in or out?
 

i'm running a 30 spectre with 300x's and 1.62's & 15x32 3 blades. mine spin out as do most outboard cats i've come across.

Re: Spin props in or out?
 

Tom
The trick here is to turn one prop in and one prop out. This will give more hydrokinetic g-string forces while accumulating x-factor t-bills. The t-bills greatly increase the gilhooley bobs and energise the bunny conglomerate. Just ask Tx2 he knows more than that other T2 nut case

Re: Spin props in or out?
 

Davey boy , what kind of sh!t are you smokin....................... I think those diesel fumes have gone to your head........................
:eek:

Re: Spin props in or out?
 

Hey Tom, how did it work out?