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pcg
Joined: 31 Aug 2018
Posts: 405
City/Region: Sherwood
State or Province: OR
C-Dory Year: 1999
C-Dory Model: 22 Cruiser
Vessel Name: C-Quest
Photos: pcg
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 Posted: Wed Feb 19, 2020 12:18 pm Post subject: |
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Yee haw!!!
| Alan wrote: | | Title 33 of the code of federal regulations governs, among other things, maximum horsepower capacity for outboard motor boats. (33 CFR 183.53) |
I found this detailed at https://www.law.cornell.edu/cfr/text/33/183.53
I made some calculations for a 22' C-Dory Using the criteria referenced above and the computer max Hp capacity is... see my calculations below.
Length = 22’
C-Dory does not have a full transom , so transom width 5.5’ from rear (broadest beam in aftermost quarter length of boat) = 88” = 7.33’
Factor = 22 X 7.33 = 161
The factor is over 52.5, the boat has remote steering and a transom at least 20” in height so…
Horsepower capacity is (2 x factor) – 90 = 232, raised to nearest multiple of 5 = 235 HP
Given the weight is not excessive, I feel comfortable re-powering with 115 hp.
_________________
Paul |
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pcg
Joined: 31 Aug 2018
Posts: 405
City/Region: Sherwood
State or Province: OR
C-Dory Year: 1999
C-Dory Model: 22 Cruiser
Vessel Name: C-Quest
Photos: pcg
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| Posted: Wed Feb 19, 2020 12:19 pm Post subject: |
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Duplicate post. I can't delete it, even though it was only one minutes since I first posted it. All I can do is edit it...
Admin please delete. |
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thataway
Joined: 02 Nov 2003
Posts: 20808
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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| Posted: Wed Feb 19, 2020 12:42 pm Post subject: |
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You have to read the full Code of regulations to apply one section:
| Quote: | 183.51 Applicability.
This subpart applies to monohull boats less than 20 feet in length, except sailboats, canoes, kayaks, and inflatable boats, that are designed or intended to use one or more outboard motors for propulsion. |
Basically there are certain guidelines, and there are many more factors than just the beam of the boat, height of the transom etc. A lot depends also on the lamination schedule, and how all of the parts are tied in together.
You would probably be fine with a 115 hp as light as possible.
_________________
Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL |
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bridma
Joined: 13 Sep 2011
Posts: 1155
City/Region: Comox
State or Province: BC
C-Dory Year: 2009
C-Dory Model: 22 Cruiser
Vessel Name: Nomad
Photos: Nomad
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| Posted: Wed Feb 19, 2020 1:51 pm Post subject: |
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My 2009 22 had twin 40hp Yamahas. If I was repowering I would be looking at twin 50hp Yamahas or 60hp Yamahas. Cost and weight would probably dictate my decision.
Martin. |
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thataway
Joined: 02 Nov 2003
Posts: 20808
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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PEN
Joined: 27 Aug 2016
Posts: 21
City/Region: New Orleans
State or Province: LA
C-Dory Year: 1993
C-Dory Model: 22 Cruiser
Vessel Name: Caprice
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| Posted: Wed Feb 19, 2020 2:40 pm Post subject: |
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now that almost all the bases have been covered regarding hp. and and and thanks to all responses.. along with other considerations.. I am heading to the Honda 90...
One last item.. shaft length.. 20 or 25. thoughts? . Paul
_________________
Caprice is now ready for a new home. Just installed
new engine.. Honda 90, Just 10 hours. Comes with trailer. Shore power . Air and Heat. She is ready to travel.. either by Sea or Land. |
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thataway
Joined: 02 Nov 2003
Posts: 20808
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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| Posted: Wed Feb 19, 2020 3:46 pm Post subject: |
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| Quote: | | One last item.. shaft length.. 20 or 25. thoughts? . Paul |
20" is the proper shaft length for the 22. |
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PEN
Joined: 27 Aug 2016
Posts: 21
City/Region: New Orleans
State or Province: LA
C-Dory Year: 1993
C-Dory Model: 22 Cruiser
Vessel Name: Caprice
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| Posted: Wed Feb 19, 2020 4:47 pm Post subject: |
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Hello Thataway ! GREAT. ! that confirms my measurement . This is the last piece of the Replacement Puzzle. As soon as our New Orleans Carnival is over, I will be pulling the trigger on the motor replacement.
Many thanks for all your expertise help. Regards. Paul Nelson, |
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