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Author Topic:   Back up prop For Montauk
Fred Torres posted 06-24-2001 09:50 PM ET (US)   Profile for Fred Torres   Send Email to Fred Torres  
I Just purchased a Montauk with an 87 90 yamaha I'd like to purchase a back up prop. I'm going to remove the one thats on there now because she runs great but I don't know the pitch. What are you guy's running and why how fast etc........No water sports just chasing birds (fishing).
Dick posted 06-24-2001 10:30 PM ET (US)     Profile for Dick  Send Email to Dick     
The Whaler rigging chart shows a 12.75 X 21 as the standard prop. Your prop should have some numbers on it, either showing the pitch or a Yamaha part number. I would go with the same pitch you now have if it turns in the proper RPM range and performs well. My preference is a stainless steel for the primary prop and an aluminum for back up.
There will be tons of responces to this, 3 blade vs 4 blade vs 5 blade. Get your prop dealer to let you experiment to find the one that works best for you.
Dick
Tsuriki BW posted 06-25-2001 01:30 AM ET (US)     Profile for Tsuriki BW  Send Email to Tsuriki BW     
Fred..

"I'm going to remove the one thats on there now because she runs great but I don't know the pitch."

I Don't understand. if it runs great, why fool with it??

Tsuriki

Clark Roberts posted 06-25-2001 05:25 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
I have owned several (maybe 5) Montauks with 90 yams and none would spin more pitch than a 15"... One did handle a 17" pitch but hole shot was not good... with a 15" pitch stainless 3 blade I got around 5500 and 38-40 mph max..(and a terriffic hole shot) with the 17 I got about 5200 and same top speed... If the book recommends a 21" or something in that realm, I don't understand! I've been there and done that.. others may have different experiences but I have two neighbors with 17 Whalers and 90 Yams with 15" pitch stainless props... ??? Clark.. Spruce Creek Navy
JimU posted 06-25-2001 11:00 AM ET (US)     Profile for JimU  Send Email to JimU     
I'm running a a 13 3/4 by 15 on my Yam 90. Good hole shot and 42 mph at wot. If it works don't fix it. JIM
Bigshot posted 06-25-2001 11:20 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Have a 90 Yam and run a 17" SS yamaha prop. Had 3 200lb guys in it, cooler of beer, and a buoy(found it in the mangroves(100+lbs), and about 25 gals of gas. She would pop on plane and would hit 5200+ rpms, empty 54-5500. I say the Stainless 17".
bones posted 06-25-2001 08:21 PM ET (US)     Profile for bones  Send Email to bones     
Fred & Dick:

Started out with a standard 19-pitch aluminum 3-blade on my 2000 Montauk & 2001 90HP Yama. Only got 39 mph & 4800 r's. Switched to a 17" & speed increased to 42 mph @ 5300 wot. The 17's the one.

bones@toad.net

Dick posted 06-25-2001 09:33 PM ET (US)     Profile for Dick  Send Email to Dick     
I have never run that combination. I was only passing on what Whaler has in their rigging chart and they have been known to make mistakes in this. Glad someone with actual experience showed up.
Bigshot posted 06-25-2001 10:26 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Not the first time. They recommend a 17" on a 15 w/70hp. I ran a 21 SS and got 58-5900.
Fred Torres posted 06-25-2001 10:48 PM ET (US)     Profile for Fred Torres  Send Email to Fred Torres     
Hey thanks for the info guys this has been very informative. To the guy who did'nt get why I was removing the prop that I have on there now...It was to further investigate which pitch I.D # etc. Thanks to all of you who understood that I need a back up prop.
Fred Torres posted 06-25-2001 10:49 PM ET (US)     Profile for Fred Torres  Send Email to Fred Torres     
Hey thanks for the info guys this has been very informative. To the guy who did'nt get why I was removing the prop that I have on there now...It was to further investigate which pitch I.D # etc. Thanks to all of you who understood that I need a back up prop.
FISHNFF posted 06-26-2001 12:11 AM ET (US)     Profile for FISHNFF  Send Email to FISHNFF     
There is much more to a prop than the numbers tell. Cupping and rake are not listed but play a huge role in performance. Don't forget different motor lower unit gear ratios. My Alert/Montauk with a 75 Merc (2.31 gears) ran a 19" Ballistic SS prop to 5600RPM and 35 knots. My Merc 90 four stroke (2.07 gears) ran the same prop 40 knots(RPM unknown),but would barely plane with 3 aboard. A 19" Yamaha SS (little cup) ran 38 knots @5800 (good hole shot and load carrying) and a 16" Ballistic(reworked 19") cupped ran 37 knots@5750RPM. I added a double cup on the Ballistic because of some ventilation and now run 36 knots@5400RPM. Rapture SS 17" netted 38 knots @5600RPM, but slower holeshot and heavy clunking in and out of gear.Merc website recommends a 19"-21".GO FIGURE!

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