[wrv993]

I currently run a 13ft Gheenoe with a 15hp 2 stroke Yamaha. My jackplate is set a 6" of setback with about 3.5" of vertical lift, I also have a cavitation plate for my lower unit... the boat runs pretty good as is. I have been using the stock aluminum prop, and i've about torn it to sh*t over the past 2 years. I do not know much about props, so I was just looking for some input on stainless props, cupping, and what would allow me to perform better in shallow water. Thanks - Al

 

[Brett]

I'd get a cupped aluminum.
Stainless is thinner and tougher, but puts more stress on the gears.
If you impact an aluminum blade, it bends easier than a stainless one.

 

[wrv993]

like i said... im not an expert on outboards. how exactly do i go about cupping a prop? do i need to take it in to a certain shop? any specific prop manufacturers? i do have a compression plate on my motor, will cupping my prop allow me to mount my motor even higher above my transom? thanks- al

 

[Brett]

Information on props

http://www.formulapropeller.com/propellers.html

http://www.rundquist.com/PropTips_Cupping.htm

Cupping can be done by most prop repair/sales shops.
Find a shop close to you and give 'em a call.
Talk with the pro's about what you have and need.
There are many brands pre-cupped available on line.

Using a cupped prop gave me one and a half inch mounting height gain over a stock prop,
and increased my top speed by half a mile per hour. Big difference on a 9.9 merc 4 stroke.

;D

 

[Gramps]

Everything Brett said... Two other notes though, an aluminum prop is about 1/3 the cost of stainless (that I've found anyhow) and my local shop cupped a prop for me in less than 15 minutes. Look for a shop that will work with you to fine tune the prop, they tend to be more customer oriented and helpful.

 

[wrv993]

Thanks for the input everyone, really appreciate it! All helpful