O/B prop

[Allan]

I would like to buy a new propeller for the Yamaha 6hp on my Etap 22i. Does anyone know if this would be a standard prop or a different pitch as it is quite a large boat for the engine?
Also is there a good place to buy one on the web?
Allan

 

[DRANNIE]

I run a 5hp honda on my eboat (22ft). I know there is a tourqe difference so one prop for planing (speed) and one for grunt (pushing a displacement hull), don't have much of a clue beyond that so I just call the dealer.

Seamark Nunn have been helpful in providing spares. I would give them a call and they will be able to advise you on the best prop for the job. They will then give you a stock number so you buy on line. It might not be listed on the website, that was certainly the case with impellor kit I ordered.

 

[seumask]

We have the Yamaha 8 2 stroke which I belive is the same basic engine. My understanding is that for pushing sailing boats yamaha do a propellor which is called a variable pitch (no moving parts) and is not a fixed number such as 8 but is more like 6 to 8. This is what we have and it works fine. Our local Yamaha dealer Ron Hale talked to me about this several years ago. I sorry I can not remeber the exact number or letter it has stamped on it.

 

[VicS]

Generally one would choose a prop with a smaller pitch (and if there is room for it a larger diameter) for a displacement hull than one you'd choose for a fast runabout.

For example my Evinrude Yactwin has a 9¼" diameter X 6½" pitch prop while the standard version of the same engine has an 8½ X 9" prop. Mine also has a greater blade area.

The best bet is to talk to your Dealer to see what props are available and which he recommends.

 

[Drascomber]

Do not buy the standard prop for this engine which is probably 8" or 9" pitch. You want the smallest pitch that Yamaha list.
If I were you I would be looking for a 6" pitch but Yamaha only list a 6.5" or a 7" "Dual thrust".
I am guessing that "Dual thrust" is Yamaha's name for a paddle bladed "Saildrive" prop which gives a good bite in reverse as well as forwards.
From memory the Yamaha 6 is a detuned twin cylinder 8 so should have plenty of torque. Accordingly either of those props should be fine. You won't get max revs with the 7" but with European petrol, detonation from running "too high a gear" shouldn't be a problem.