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What size prop

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Topic author
Robjoe237
Posts: 1
Joined: Sun Sep 10, 2017 12:50 am
Vessel Info: 1997 wellcraft 210 coastal with a 200 hp Johnson ocean running outboard

What size prop

Postby Robjoe237 » Mon Sep 11, 2017 9:31 pm

I have a 1997 wellcraft 210 coastal with a 1997 200 hp johnson ocean running outboard I don't know if I'm running the right prop. At WOT I'm running almost 7000 rpm and my speed is about 38 mph I can't stay on plane under 5000 rpm I'm new to boating and the money in gas I burn is crazy I no my motor is a gas hog but I feel I don't have the right size prop any help would be great thanks
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twring23
Posts: 3
Joined: Sun Oct 08, 2017 7:57 am
Vessel Info: 2005 sportsman 220
Yamaha F200 TXRD
Been thanked: 1 time

Re: What size prop

Postby twring23 » Wed Oct 11, 2017 12:06 pm

I would try reducing the pitch of the propeller until you get manufacturer's rpm spec. - most likely 5500 - 6000 rpm at wide open throttle (WOT) generally rule of thumb is 200 rpm per inch of pitch. Be sure to verify this info - it's been a while since I have thought about props
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kwright66
Posts: 8
Joined: Tue Sep 18, 2018 12:45 am
Vessel Info: 1996 Wellcraft 238 Coastal, 225 hp Mercury Oceanrunner
Port of Registration - Santa Fe, Texas
Has thanked: 1 time

Re: What size prop

Postby kwright66 » Tue Sep 18, 2018 1:59 am

twring23 is correct, 7000 rpm's is way to high on your top end, although I'm pretty sure that reducing the pitch will make your RPM's go up. Increasing the pitch will bring them down. Please correct me if I'm wrong.
:cool: 1996 Wellcraft 238 Coastal, 225 hp Mercury Oceanrunner, Port of Registration - Santa Fe, Texas
1989 30 ft, Chris craft, Twin 350 Chevy's - Total - 300 hp, Port of Registration - Santa Fe, Texas
1990 Harley Custom Softail, "My Other Toy"
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230 Fisherman
Posts: 2
Joined: Thu Jan 16, 2020 9:00 am
Vessel Info: 2000 Wellcraft 230 Fisherman w/225 Ficht

Re: What size prop

Postby 230 Fisherman » Thu Jan 16, 2020 9:03 am

You are grossly underpropped. What size prop do you have on now.
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