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  1996 Outrage III (19'-8"),what props are you using?

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Author Topic:   1996 Outrage III (19'-8"),what props are you using?
lpaton posted 06-18-2002 07:24 AM ET (US)   Profile for lpaton   Send Email to lpaton  
Outrage III with 200 hp Yamaha.
SS 15-1/4x17" prop at 5500 rpm gives 44mph.Matches Jim's prop calculator with about 5% slip.Thought I could do better so borrowed a 14-1/2x21"(alum). Could only get 5200rpm and 43mph.Prop calculator said I should get about 51mph with 5% slip. Looks like about 20% slip.
Will try to borrow a 19" pitch prop.
Anyone got a similar rig? I want a spare prop but don't want to order blind and dealers around here don't have many props on hand and don't lend when they do.
Laird
phatwhaler posted 06-18-2002 01:41 PM ET (US)     Profile for phatwhaler  Send Email to phatwhaler     
1996 19 OR (19'8")
150 Merc EFI XL OS
14x17 @ 5600
Full tank of gas
t-top
41 mph (GPS)
lpaton posted 06-19-2002 06:47 AM ET (US)     Profile for lpaton  Send Email to lpaton     
Thanks phatwhaler. Your info confirms my thinking. Both our 17" pitches give similar performance. With an extra 50hp I should be able to increase pitch. Maybe 19" is the answer.Michigan Wheel feel 21" should be right for my boat but the trial I did indicates slippage. Can't figure that one out.Maybe some of the "classic" boys will have some answers if they lurk at this end of the forum.
Laird
Peter posted 06-19-2002 08:11 AM ET (US)     Profile for Peter  Send Email to Peter     
Two factors I see here as contributing to less than expected performance. First is that aluminum blades are usually thicker than stainless and they usually get less bite (higher slippage). Second is that the diameter of the aluminum prop is 3/8" less than the equivalent SS Yami SW Series prop. So for every turn of the prop you are moving a lower volume of water with the aluminum prop even though the pitch is the same.

I'd try the 19" SS Yami SW Series prop which I believe has a 15" or greater diameter. It should achieve a WOT of about 5300 with a top speed of approximately 47 mph.

jacko posted 06-19-2002 08:43 AM ET (US)     Profile for jacko  Send Email to jacko     
2000 OR 18 (probably same weight)
Yamaha 175 DETOX
19" Steel prop
Fully Loaded
48 MPH

I know its a different boat but hope it helps

jacko posted 06-19-2002 08:44 AM ET (US)     Profile for jacko  Send Email to jacko     
sorry - At 5100rpm (tops)
John from Madison CT posted 06-19-2002 03:51 PM ET (US)     Profile for John from Madison CT  Send Email to John from Madison CT     
Hey, it's nice hanging with the rich post-Classic Whaler boys !<G>

Anyway, wanted to pipe in here on Props since I have a thread going on the Performance section.

Here is my story:

Boat: 22' Whaler Outrage ('88) with Whaler Drive, Yamaha 250hp ('98 motor), Tee Top, Front Curtain, 40 gal gas. One person.

With 14 7/8" x 21" prop (Yamaha SS Series) got 4900RPM's at WOT, when trimmed out more started to Porpoise.

With 15 1/4" x 19" (same Yamaha SS Series) got 5200RPM's and 44MPH.

Gained 300RPM's, expected 400RPM gain but forgot about larger diameter of second Prop..

Suppose I could have even gone to a 17" pitch.

John

lpaton posted 06-20-2002 08:04 AM ET (US)     Profile for lpaton  Send Email to lpaton     
Hi John.
What's your boat weight
Laird
John from Madison CT posted 06-21-2002 06:11 AM ET (US)     Profile for John from Madison CT  Send Email to John from Madison CT     
Laird,

Dry hull weight is 2300lbs..

John

tbyrne posted 06-21-2002 10:13 AM ET (US)     Profile for tbyrne    
I think you could go to the 17" pitch. Especially if you plan to run with more than one person and 40 gal. fuel. How much fuel does she take? At 6 lbs/gal, your weight will go up fast if you're planning an offshore trip (or out to beautiful Block Island)!
John from Madison CT posted 06-21-2002 07:40 PM ET (US)     Profile for John from Madison CT  Send Email to John from Madison CT     
tbyrne,

I'm starting to think the same thing. 17" might do it but I already bought this new 19" prop. (darn !)

I found a high quality prop shop in Essex, CT who repitches Stainless props up to 2".


John

Swellmonster posted 06-23-2002 12:26 AM ET (US)     Profile for Swellmonster  Send Email to Swellmonster     
My 20 has a merc 225 efi.
Bought it with a 19 and the rpms were 5200 - 5400, bow stayed down....
My motors rpm's should be 5800
I went down to a 17, mega diff on the low end and my rpms are where they should be with verying load and fuel. (52 mph gps)
You WILL need trim tabs!

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