High Thrust Prop Yamaha 9.9

[greatspirit]

Sorry…I promised this information a few weeks back…..too windy to get to the boat until recently.
Numbers on the blade of the High-thrust prop for Yamaha 9.9 hp 4-stroke:
"Eleven and Three-quarters x Nine and One-quarter - R" The first number (I think) is the propeller diameter and the other is pitch which is the theoretical distance travelled in one revolution (all inches). R is presumably the direction of rotation (seen from behind).


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[Talbot]

I understand that this years 9.9 high thrust has been revised by Yamaha and is actually the old 15 hp block de-tuned. It is therefore quite a lot heavier than the older model, but presumably has more torque.

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[Inselaffe]

Thanks greatspirit,

Ill check it when I get back home - awaz for a month in lisbon which would be nice but as usual I have a bad flu and am feelig too sorry for mzself to be very comunicative

Thanks again

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[mikewilkes]

I have a 9.9 high thrust series A engine. My yammy dealer back in Inverness said he could up it to a 15, well for engines after A series anyway. The lump I have got weighs about 52 kgs so she certainly is pretty heavy.


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[Talbot]

sounds like you have one of the "new" ones. Be interesting to see what the impact on fuel consumption would be? You would certainly have more oomph for pushing against the wind!

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[Inselaffe]

just cleaned my prop and now I can read "Eleven and Three-quarters x Nine and One-quarter - R" on mine too, must be a high thrust