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Fitting Saab model G 10hp into dory.

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trath
New member
Username: trath

Post Number: 2
Registered: 01-2007
Posted on Thursday, January 25, 2007 - 09:55 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hello All!
Does anyone have an opinion on fitting a Saab model G 10hp single with variable pitch propeller into a 21' dory? Would this engine tend to shake too much? It would be a bit overpowered for a dory of that length, if one does the calculation for hull speed etc, but I don't know if that matters too much. Any and all opinions would be greatly appreciated.
Regards,
Tim
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oslin04
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Username: oslin04

Post Number: 4
Registered: 10-2006
Posted on Thursday, January 25, 2007 - 11:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Yes i do Tim, don't try and do it!
The hull is foam filled between an inner and outer form,the strength being in the bonded pair, and will not be strong enough to support engine bearers, it is not designed for this type of instalation, it would shake and crack the boat to bits in a very short time, my advice- stick to an outboard :-)
Keith Marine Engineer
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trath
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Username: trath

Post Number: 3
Registered: 01-2007
Posted on Thursday, January 25, 2007 - 01:30 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hello Keith,
I guess I was not clear in my explanation in that the boat would be a traditional grand banks dory. This is a wooden boat, with a narrow flat bottom with significant rocker and sheer. Bottom length about 17' to 18' and overall length 21'. These boats were built for fishing off the Grand Banks and would often have a 2 cycle make and break engine fitted in them. What do you think?
Best Regards,
Tim
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oslin04
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Username: oslin04

Post Number: 5
Registered: 10-2006
Posted on Thursday, January 25, 2007 - 04:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Oh sorry Tim, i thought you were talking about a plastic one, but you have a real boat :-)

In that case there should not be a problem, but you might like to concider a twin cyl, a single will be a bit clanky and with more vibration than a twin, but if you have a single to hand then why not!
Keith
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trath
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Username: trath

Post Number: 4
Registered: 01-2007
Posted on Thursday, January 25, 2007 - 05:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Keith,
Yes, I had forgotten that there are several companies making glass boats called "Something Dory", etc. But thank you for the advice on the twin. That may be a possibility. I haven't yet bought the single. I do have an Acadia 4hp make and break in brand new, never used condition, but I am wondering if I should just preserve it and fit a more modern engine. Thank you again and I will keep you posted on my progress.

Best Regards,

Tim
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oslin04
Member
Username: oslin04

Post Number: 6
Registered: 10-2006
Posted on Friday, January 26, 2007 - 04:51 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Ok Tim, good luck with it, there is no problem fitting an older engine providing spares are available.
I do not know where you intend to use the boat, but if it is on inland waters you will have to comply with new safety regs with your inatalation i.e. fuel tank vented overboard with an earth strap, stainless flexable fuel hoses, (use gas lines)oil tray under the engine, fire extinguisher,and no gas or fuel lines in the bilges, etc.
not as bad as it sounds :-)
Regards keith
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miro
Senior Member
Username: miro

Post Number: 257
Registered: 11-2001


Posted on Friday, January 26, 2007 - 01:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Make the engine bed as beefy as you can - no matter what engine you put in. You'll also find that the boat will smooth out when you are running in water. On dry land the boat will shake like crazy . Having the hull in the water seems to make it more vibration resistant ( within limits of course).
Over time you'll also find that the bilge will become loaded with oil grease and other crud, so please be diligent and mop the stuff out after every cruise if you can.
Miro
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trath
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Username: trath

Post Number: 5
Registered: 01-2007
Posted on Friday, January 26, 2007 - 04:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Keith,
Thank you yet again for good information. The boat will be used in Lake Champlain primarily, so yes in fresh water and inland. I will also look into all of the local regulations. Thanks again.
Tim
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trath
Member
Username: trath

Post Number: 6
Registered: 01-2007
Posted on Friday, January 26, 2007 - 04:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

hello Miro!
Yes, I am sure that heavy beds would be necessary for the Saab or really any engine of this size. I remember the grease/oil mess from my old jump spark single and will try to be diligent in that regard. I am hoping that the Saab will be better in keeping the bilges clean, but I am sure that good house keeping will still be best. Thank you for the excellent advice!

Best Regards,

Tim
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kurtizus
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Username: kurtizus

Post Number: 2
Registered: 02-2007
Posted on Friday, March 02, 2007 - 06:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have a brand new 10 hp sabb for sale anyone ? email me at milagrocurtis@yahoo.com

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