Moderated Discussion Areas
ContinuousWave: Whaler Performance
what prop size
|Author||Topic: what prop size|
posted 01-24-2003 05:44 PM ET (US)
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.
posted 01-24-2003 08:41 PM ET (US)
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.
posted 01-24-2003 11:05 PM ET (US)
Try https://www.surplusunlimited.com/storefront.htm . Aluminum about $88, Stiletto s/s about $199, and Rapture s/s about $216. No idea on shipping to Hawaii.
posted 01-25-2003 12:46 AM ET (US)
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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