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Author Topic:   what prop size
lc posted 01-24-2003 05:44 PM ET (US)   Profile for lc   Send Email to lc  
I'm clueless about prop size. I'm trying to calculate the cost of repowering my 198115' whaler. I 'm looking at
a four stroke 50 hp merc. However, props are sold seperately. Can anyone give me info on appropriate size and price. I use my boat for fishing and diving. Usually 2 to 3 people on board , some light gear , 12 gallons of gas. any help would be greatly appreciated.
mahalo lc
where2 posted 01-24-2003 08:41 PM ET (US)     Profile for where2  Send Email to where2     
Price:$250+ for Aluminum, $400+ for Stainless. 20% higher if you buy one stamped Mercury over one from Michigan. Prices somewhat lower if you go on Ebay.

Can't tell you pitch without knowing whether it's the Bigfoot, or the Little Foot lower unit. They have different gear ratios. Get the engine specs, and play with the Prop Calculator (on this site)using the default slippage Jim suggests.

Barry posted 01-24-2003 11:05 PM ET (US)     Profile for Barry  Send Email to Barry     
Try . Aluminum about $88, Stiletto s/s about $199, and Rapture s/s about $216. No idea on shipping to Hawaii.
Roscoe posted 01-25-2003 12:46 AM ET (US)     Profile for Roscoe  Send Email to Roscoe     
Mercury had incomplete information on specfic engines with different prop sizes.I've tinkered with different prop sizes,on a specific engine.I did gain top speed incressing the pitch, but lost the planing power,and suffered cavitation problems with slow speeds on incressed pitch.I ended up buying the stock prop in stainless, and had them cupped for cavation.The stock size is usually the best.

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