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Author Topic:   Vertical Extensions on '62 13 classic
CarlRobert posted 06-02-2001 11:55 PM ET (US)   Profile for CarlRobert  
Months ago there was some interest concerning vertical extensions generated by jimh's fine article on engine brackets. Well, I just finished installing a new 20" shaft Merc 40 HP 4 stroke on my 1962 13' Sport's 15" transom. I used the CMC vertical extensions to accomodate the new motor and am very pleased with the results.

I made a plywood template of the engine bracket's hole pattern (which matched the hole pattern on the extensions) and clamped it to the transom. I then measured the wedges formed between the curvature of the transom and the template. I laminated wedges out of sheets of plexiglass to match the wedges, then drilled the wedges to match the extension mounting holes. I through-bolted the transom (wood was in superb condition) and ended up with a solid engine mount that I believe places no bending forces on the engine bracket or the vertical extensions (All the pros wanted to shim with stainless washers. I experimented with washers beforehand to see how many would "straighten out the transom" and the number required seemed like they place a lot of stress on the bolts. Maybe I'm paranoid, but it didn't seem quite right to install a 212 lb motor that way...)

I caulked around the shims with 3M 5200 and everything seems rock solid. Tomorrow I hope to install the NFB Teleflex. With this set-up there is plenty of hole adjustment on the motor and lots of clearance to install the push-arm through the tilt tube.

I have a Trophy Sport 4 blade prop on order and am looking forward to using the boat for the first time. The little Whaler may be a little stern heavy with the added weight, but fortunately I'm not stern heavy myself!

I am always impressed by the quality of this nearly 40 year old boat, and if it sinks the first time I use it or the motor tumbles off, at least I had a heck of a good time puting it together.


lhg posted 06-03-2001 04:21 PM ET (US)     Profile for lhg    
Sounds like you are going to have a SUPER installation. Send some pictures to JimH and let us know how you like the power setup, including the new 4 bladed prop. You may be the first one here to try one of those out.
tbirdsey posted 06-03-2001 05:33 PM ET (US)     Profile for tbirdsey  Send Email to tbirdsey     
Carl: I too would love to see some photos. Repowering my 1962 13 is on the list of things to do and I'd love to hear more about performance and see your results.
RHLOOS posted 06-05-2001 04:43 PM ET (US)     Profile for RHLOOS  Send Email to RHLOOS     
Carl, I recently received my Vertical Extension from CMC (1/2" Alum. angle} and I'm waiting on a Yamaha 25HP Four Stroke w 20" Shaft. I did have the 40HP Four Stroke w 15" Shaft but got tired of pulling motor up by hand. I dropped down to 25HP because of weight. Didn't like the way the boat would lay in water at rest, and adding long shaft and vertical extension i thought would be too much. by the way, it's a 1966 13' Sport. I would greatly appreciate pictures! I was considering using Formula 27 (body filler) and gradually filling out the void down the sides and in toward the ctr. as much as possible. I am a Glazing Contractor and frequently use Lexan, your idea of using Plex. sounds much easier, quicker and yet solid. Thank's ROB
CarlRobert posted 06-06-2001 11:30 AM ET (US)     Profile for CarlRobert    
Rob, the weight of the 15" 40 hp 4stroke Merc was approx. 205 lbs (dry wt). The weight of the 20" was 212 lbs, only 7 lbs more (I don't know if that includes the PT&T, it can't weigh but a few lbs). I can't recall the weight of the vertical extensions, but they were approx. 5-7 lbs each. If I had to do it over again, I would remove the bottom 3-3.5 inches off both brackets below the bottom hole. One would shave off a little weight and I think the installation might look a little cleaner. I'll send jimh pictures as soon as I get the ss prop on (I know, more weight!). I think Lexan would be as good as plexiglass, just be sure to drill the holes at a low speed with a sharp bit.


CarlRobert posted 06-06-2001 11:35 AM ET (US)     Profile for CarlRobert    
Oh yeah, total engine setback = 1" including 1/2" bracket.


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