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Prop sizing
- Fallguy87
- Scurvy Dog
- Posts: 4
- Joined: March 10th, 2018, 8:38 am
- Vessel Info: 1978 carver santa cruz 28. Twin 302 fords.
- Location: Colchester ontario
- Has thanked: 3 times
Prop sizing
- bud37
- Admiral
- Posts: 4676
- Joined: April 23rd, 2015, 10:22 pm
- Has thanked: 547 times
- Been thanked: 1142 times
Re: Prop sizing
- Fallguy87
- Scurvy Dog
- Posts: 4
- Joined: March 10th, 2018, 8:38 am
- Vessel Info: 1978 carver santa cruz 28. Twin 302 fords.
- Location: Colchester ontario
- Has thanked: 3 times
Re: Prop sizing
- km1125
- Admiral
- Posts: 3338
- Joined: February 28th, 2017, 6:04 pm
- Has thanked: 56 times
- Been thanked: 965 times
Re: Prop sizing
How much clearance do you have from the prop tips to the hull?
- waybomb
- CYO Moderator
- Posts: 2404
- Joined: February 5th, 2013, 9:24 pm
- Vessel Info: 1995 Boston Whaler Rage15
1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glasspar / 1967 Johnson Electromatic 85
1996 Boston Whaler Rage 15 - Location: Saint Joseph,Mi
- Has thanked: 50 times
- Been thanked: 396 times
Re: Prop sizing
Smaller prop means more rpms. Larger prop means less rpms.
Fred
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572 ci
1995 Boston Whaler Rage
Past - 1988 2807, 1989 4207 Aft
- bud37
- Admiral
- Posts: 4676
- Joined: April 23rd, 2015, 10:22 pm
- Has thanked: 547 times
- Been thanked: 1142 times
Re: Prop sizing
- bud37
- Admiral
- Posts: 4676
- Joined: April 23rd, 2015, 10:22 pm
- Has thanked: 547 times
- Been thanked: 1142 times
Re: Prop sizing
Fallguy87 wrote:Source of the post Morning all. I have 2 rebuilt strong 302 ford's. The boat runs at 18 mph gps speed at 3600 rpm. Pretty sure from what I've read that's way to high engine speed. Gets on plane in seconds. I'm guessing.... maybe closer to 15x15???? Does anyone know what the factory was?
You're in luck ...found this, but is from a 1980...probably close to yours...check it out...performance data and all......
http://www.carveryachts.com/media/4691/ ... ruz_80.pdf
- km1125
- Admiral
- Posts: 3338
- Joined: February 28th, 2017, 6:04 pm
- Has thanked: 56 times
- Been thanked: 965 times
Re: Prop sizing
bud37 wrote:Source of the postFallguy87 wrote:Source of the post Morning all. I have 2 rebuilt strong 302 ford's. The boat runs at 18 mph gps speed at 3600 rpm. Pretty sure from what I've read that's way to high engine speed. Gets on plane in seconds. I'm guessing.... maybe closer to 15x15???? Does anyone know what the factory was?
You're in luck ...found this, but is from a 1980...probably close to yours...check it out...performance data and all......
http://www.carveryachts.com/media/4691/ ... ruz_80.pdf
Good starting point, but I think a couple things are interesting.
1) ALL the engine options are specified in HP, EXCEPT the 302.
2) The 220HP and the 302 are both spec'd in the document (twice) as being 1.52:1 ratio transmissions, but in the performance data it lists 220HP engines and 1.46:1 ratio.
The OP has 14x11 and the test boat has 16x15... quite a difference.
- waybomb
- CYO Moderator
- Posts: 2404
- Joined: February 5th, 2013, 9:24 pm
- Vessel Info: 1995 Boston Whaler Rage15
1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glasspar / 1967 Johnson Electromatic 85
1996 Boston Whaler Rage 15 - Location: Saint Joseph,Mi
- Has thanked: 50 times
- Been thanked: 396 times
Re: Prop sizing
Big difference between 14 x 11 and 16 x 15.
If it has 3 blade props and they are actually that small, there are other problems.
Fred
1969 Glaspar Avalon /1969 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572 ci
1995 Boston Whaler Rage
Past - 1988 2807, 1989 4207 Aft
- RGrew176
- Admiral
- Posts: 6195
- Joined: August 17th, 2015, 4:07 am
- Vessel Info: 2022 Stingray 182 SC
- Location: Southgate, MI.
- Has thanked: 72 times
- Been thanked: 462 times
Re: Prop sizing
2022 Stingray 182 SC
2004 Past Commodore
West River Yacht & Cruising Club
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