Dumb Question About Boat Props
- This topic has 2 replies, 3 voices, and was last updated May 22, 2015 at 10:50 am by
.
-
Posts
-
Guys, what’s the deal with boat props? 3 blade, 4 blade, pitch, etc? Anyone want to explain the variables to me? Is there one that’s faster? Better hole shot? Less fantail?
Zach
Hey Zach,
Offered with the caveat that I haven’t had that many boats, or even with them gone through a very sophisticated prop selection process.
That said, if you buy a package (boat & engine) from a dealer, they usually have worked with the makers of both to put on a prop (or offer a couple of choices) that optimize pitch and diameter for running the engine in its RPM power/economy band for your uses. Lacking that, some dealers will let you test/swap props to find the one you like best (and assuming you don’t damage the prop) for your package/uses.
There are always compromises, spinning up fast vs economy causing, etc. Not sure it’s that big a deal on relatively low HP engines, within reason. There are plenty of on-line articles from various prop makers, boating mags, etc. with general information. But hull manufacturer should be the first to ask about prop for a specific model and engine make/HP.
And don’t forget material: aluminum vs. stainless.
Buzz
I’m not overly concerned with boat performance. If I can hit 30 or close to it cruising speed I’m happy. That being said I can still explain the basics. 4 blade props usually provide the advantage of quicker hole shot (acceleration), less cavitation, and very little loss of top end speed with heavy loads. Also i think they provide more stern lift allowing the boat to operate in shallower water (not certain if they all have this quality). 3 blade props are typically faster top end. In my opinion 4 blades are rarely necessary unless you live somewhere like Texas where you may run a mile or more in 12 inches of water. Better off to just not be lazy and pole that extra 1/4 mile to deeper water.
- You must be logged in to reply to this topic.