Reply
 
Thread Tools Search this Thread
 
Old 08 April 2021, 18:28   #1
Member
 
Country: USA
Town: Clearwater, FL.
Boat name: Capt. Morgan
Make: Zodiac
Length: 5m +
Engine: Outboard-90HP Yam-LA
Join Date: Mar 2021
Posts: 17
Propeller Advice

I have a 550 SRMN with 90HP Yamaha F90LA. I bought the boat without a propeller. Any suggestions. Looking for something middle of the road performance and stainless steel. Suggestion to go with or stay away from would be appreciated. TIA
__________________

__________________
DSR-550SRMN is offline   Reply With Quote
Old 08 April 2021, 22:47   #2
Member
 
Country: UK - England
Town: Nottinghamshire
Make: Ranieri 15
Length: 4m +
Engine: Suzuki DF50
Join Date: Jul 2016
Posts: 689
http://solaspropellers.com/index.php...ts/prop-finder

13.25x17 is middle of the road for 90hp (or 13x17 if a four blade).
__________________

__________________
Limecc is offline   Reply With Quote
Old 09 April 2021, 02:38   #3
Member
 
Roflhat's Avatar
 
Country: UK - Scotland
Town: Isle of Lewis
Boat name: Macleod Special
Make: Ceasar Thundercat
Length: 4m +
Engine: Yamaha 70ces
Join Date: Jul 2010
Posts: 1,015
RIBase
Can't go wrong with Yamahas own stainless semi cleaver range too, great props https://www.ebay.com/itm/Yamaha-Stai...0AAOSw31RgR9aH
__________________
Roflhat is offline   Reply With Quote
Old 09 April 2021, 15:24   #4
Member
 
Country: USA
Town: Clearwater, FL.
Boat name: Capt. Morgan
Make: Zodiac
Length: 5m +
Engine: Outboard-90HP Yam-LA
Join Date: Mar 2021
Posts: 17
Selection Looks Endless....

Thanks for the suggestions....Having never purchased a propeller before.



A side from diameter and pitch what mating issues do I need to look at to make sure it fits if I buy by mail order/Ebay?



Are all Yamaha F90LA's the same rotation?



What rotation is that CW or CCW?

(Just dropped off the boat for a seam repair so can't go out and start it up)



I see the shaft is a spline are all F90LA all the same fitment?



Thanks for the help!!!
__________________
DSR-550SRMN is offline   Reply With Quote
Old 10 April 2021, 03:01   #5
Member
 
Roflhat's Avatar
 
Country: UK - Scotland
Town: Isle of Lewis
Boat name: Macleod Special
Make: Ceasar Thundercat
Length: 4m +
Engine: Yamaha 70ces
Join Date: Jul 2010
Posts: 1,015
RIBase
The other two things to make sure it fits are the exhaust tube diameter and the number of splines on the prop shaft. Splines will be 15, fairly universal between outboard manufacturers - mercury/yamaha/tohatsu etc share fitment. Exhaust tube is also fairly universal but for 15 spline motors there is a range. You can check by measuring the diameter of your gearcase.

99% of the motors will be CW - RH rotation. Not sure if the 90hp was even available CCW, some are but usually starting from about 150hp for people who have twin engine setups. The opposing propeller rotations help counter torque steer
__________________
Roflhat is offline   Reply With Quote
Old 10 April 2021, 07:37   #6
Member
 
Country: USA
Town: Clearwater, FL.
Boat name: Capt. Morgan
Make: Zodiac
Length: 5m +
Engine: Outboard-90HP Yam-LA
Join Date: Mar 2021
Posts: 17
Much appreciated!! TY
__________________
DSR-550SRMN is offline   Reply With Quote
Old 12 April 2021, 20:21   #7
Member
 
Country: Australia
Town: Dalmeny
Make: zodiac
Length: 5m +
Engine: outboard
Join Date: May 2015
Posts: 1,050
Also Yamaha's aluminium props are very good and a fraction of the price of stainless. I had a Yamaha dealer bring a box of props to water test my 550 and we found the aluminium actually outperformed the stainless. Depending on your work application an aluminium prop can be better on the gearbox if you continually need to gear change (in and out of gear). I drive commercial abalone boats where divers work bellow on hooka gear, the boat is not anchored but held in place by engaging gear to stay with the divers. Many commercial vessels such as tour boats will also use aluminium because of the less pressure put on gearing. The crocodile tour boats to my north clock up over 10,000hrs on their Yamahas where most of the day the boats are in and out of gear approaching then backing off from wildlife. These days aluminium props are far better than a few years ago and in many cases outperform lower cost stainless ones. This side of the pond (Australia) Yamaha offer a full prop exchange to allow you to select the correct prop for your application.

As already mentioned by others the 17 pitch would also be my starting point with the 90hp. Much will have to do with the weight of your outfit, fuel and passengers etc. I normally have two props for my boats, one for light loads and one when Im loaded up with dive gear and extra fuel and water for extended offshore week long trips etc.
__________________
jonp is offline   Reply With Quote
Old 13 April 2021, 13:03   #8
Member
 
Country: UK - England
Town: Farnborough
Boat name: Nostromo
Make: Arrow
Length: 8m +
Engine: 557cu, 700hp
Join Date: Jul 2003
Posts: 1,494
That's interesting about the inertia on an ali prop vs stainless, I hadn't considered that before.

Also good point that a good ali prop is probably better than an average stainless one.
__________________
Matt is offline   Reply With Quote
Old 14 April 2021, 09:20   #9
Member
 
Country: USA
Town: Clearwater, FL.
Boat name: Capt. Morgan
Make: Zodiac
Length: 5m +
Engine: Outboard-90HP Yam-LA
Join Date: Mar 2021
Posts: 17
Much appreciate the insight & recommendations. I have yet to see a decent size RIB here in my area and so local experience is nonexistent.



I am looking at prop manufacturers and they reference the "gear case size" as either 4-1/4" or something different? I have the service manual but can't find the size?



One site say "Will fit most Yamaha F90's" but they have a "No Return" policy.



As noted above someone say's is 15 spline (2012 F90LA) so assuming it is. The boat is now at the tube repair shop so don't have here to check anything.


This is for pleasure use. I calculate the payload with 2 people, stuff & fuel at 2,000 lbs nominal and 2350 lbs if 4 people.
__________________
DSR-550SRMN is offline   Reply With Quote
Old 06 May 2021, 09:08   #10
Member
 
Country: USA
Town: Clearwater, FL.
Boat name: Capt. Morgan
Make: Zodiac
Length: 5m +
Engine: Outboard-90HP Yam-LA
Join Date: Mar 2021
Posts: 17
To update this original post I purchased a Michigan Match propeller #101033 which is a 13.25/17. The propeller form, fit & finish looks of very good quality and install was simple & quick. I haven't got a chance to put the boat in the water yet but will report back when I have some experience with it.
__________________

__________________
DSR-550SRMN is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




All times are GMT -5. The time now is 12:37.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.