prop for Honda 75 hsp

[CORNFIELD]

Took my 19' C Dory Angler up the NAPA River and scarred up the prop. Thought I would get a replacement and used the old one as a back up. Any suggestions would be appreciated, mostly used for fishing in the
San Francisco Bay and outside the Golden Gate.

Thanks,

Steve

[Sea Wolf]

Steve-

It would help to have a few reference points, like what prop you had and how many rpm you were getting out of it, and whether you load your boat heavy, moderate, or light.

Generally a 15 inch pitch three-blade aluminum prop of about 13-1/2 inch diameter is standard for your boat and average sea-level conditions. Stainless is nice, , dings less, performs a little better, but costs about three times as much.

If you load heavy, or go up to 4000-6000 feet or so in elevation occasionally, a 13 inch pitch prop would be better to allow the engine better "leverage" to wind up more and reach a better rpm operating range.

A four-blade 15 inch prop, like the Solas, available for Hondas, would be my first choice if I had your boat. It's smoother and has a better "grip" with the extra blade, but has a slightly narrower operating range and a slightly lower maximum top end due to the extra surface area/drag.

The general rule is that adding each inch of pitch drops the maximum rpm about 200 rpm with a two-to-one gear reduction drive unit.

Sometimes a 14 inch pitch prop is suggested from all the data analysis, but they' re hard to find, and re-pitching a 13 or 15 can be expensive.

Additionally, there are a lot of other factors, like changing the diameter, rake, cup, etc. on a prop that can affect performance.

Again, it would help to know what the numbers were with whatever prop you had been using.

Joe.

[dotnmarty]

When I needed a prop for our 75 on our former 22 footer I simply called Seasport Marine @ 503-656-6484. They are both a C-Dory dealer and a Honda Marine dealer and service center. I told them I needed a prop for the 75 and they sent me the right one. After I put the new one on I took the old one to a prop place in Seattle and had it trued as a spare.

[ghone]

Hi Steve, I run a 75 Yamaha on my 19 and my dealer put on the 13 1/4 X 17. I find it's too much pitch only allowing 5100 at wot. The prop they now recomend is a 13 1/2 x 15 like Joe suggests. I'll likely re prop at that and keep my current for a spare. I like aluminum props for the forgiveness if you ding something the prop bends which is cheap compared to the inner shafts etc which ar not.