Which prop on 94 Merc 75?

[archer59]

I can't find any numbers on my prop, and my Merc book won't be here until next week. What is the stock prop, and any suggestions for a new one. Will use the current prop for a spare. 1775 Pro-V. Thanks in advance for responses.

Nick

[upnorth]

So...what prop do you have now and does it work well?

You need to check the rpm range that your motor is rated for and compare it to what you actually get at WOT(wide open throttle). If the prop you have now works well in all situations, just get the same prop. If when your are fully loaded you are running on the very low end of or below the normal RPM range, you should consider a smaller pitch prop. If you are at the very high end of the rpm range fully loaded I would consider a larger pitch prop. Right in the middle I would stay where you are.

1 note here: dropping your pitch 2 inchs will bring your RPM by about 400 RPM. Upping the pitch by 2 inches will decrease your RPM by around 400 RPM.

Another note: A stainless steel prop flexes less at high RPM and will keep it's pitch where an aluminum prop flexes and loses some pitch. Meaning stainless steel will give you a few more MPH on the top end.

Clear as mud right

[marine_man]

Wow (Contact US Regarding This Word).. that's a clear, concise post... for as many propping questions as get asked in this forum I sometimes wonder if there shouldn't be a frequently asked questions thread... and your post should be there...

marine_man

[archer59]

If I knew the prop pitch I have now ... I wouldn't be asking these questions. I was told it is the prop that came with the motor new.

Nick

[Valv]

Take the prop off and look inside or outside of the hub, it has to have some numbers.

Also on outside in between blades sometimes there is something.

I would say 13" x 17pitch but I am just tossing stuff, you have to be more precise.

Do a search on this forum and you will find many ways to calculate prop size and/or already a post with pop size for your motor/boat combo.