I/O (Sterndrive) Conversion to Outboards

[tpenfield]

Do you have some help scheduled for the install. Your gonna be pressed for time.

I have offers for help.

 

[tpenfield]

More engineering on-the-fly . . . design change #6,157 .

Given that the underside of the swim deck has as much fiberglass in it as the transom, I have changed the transom reinforcement, eliminating the struts that were to extend in the swim deck cavity, and moving the top 'crossbar' lower.

I've also heeded the naval architects advice and further reduced the number of fasteners, focusing on the outer areas.
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26 fasteners on the face and about 20 on the rest of it (bevel sides, top plate).

Additionally, since the swim platform underside does not really need the struts that I had planned, I am going to lower the position of the 'crossbar' to the top of the transom openings, where it will be most effective in stiffening up the transom.
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Also, taking out the wiring and hoses has lead me to see the need for an opening on the 2 side supports that attach to the outer stringers. Something like this . . . .
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For the extension bracket, I am going to try 3/8" spacers (reduced from 1/2") to see if I can get a slightly better fit (and also use less hull putty). Speaking of which, I'm picking some up tomorrow AM. SS (316) bolts are on order, so hopefully the bits and pieces are falling into place.

The Admiral has offered to help paint the bottom, so as to speed things along when the time comes for launch preparations. I told her that part of the job includes scrubbing the caked-on algae off the bottom first.

 

[redneck joe]

So, wife is gonna scrape dried on crap from your bottom. She must really love you....


Im sure I missed the na thing on reduced fasteners. Is it similar to general construction where more can be worse than a couple, reducing overall strength?

 

[Scott Danforth]

The Admiral has offered to help paint the bottom, so as to speed things along when the time comes for launch preparations. I told her that part of the job includes scrubbing the caked-on algae off the bottom first.

The Admiral has been busy doing make-overs on the bathrooms. Fortunately there is one bathroom recently re-done so we have a place to

Her commitment to me, so as not to distract from my boat bracket building, is to do most of the work herself.

Ted is going to owe the Admiral

 

[tpenfield]

The words for the day are 'pressure washer' . . . that will do the trick.

I think I there may be a new pressure washer in my future, because the reigning machine had a throttle/governor mishap.

Anyway, I've been trying to get this 'bonding plate' off the transom for the past few weeks. In our discussions of 5200 adhesive, if it is 5200, it must be the good/old stuff. It held on with all of its might until I cut the last bit of it. In trying to pry it off, the thing just laughed at me. So, I reverted to cutting the adhesive with a variety of sharp tools.
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Also, in our discussions of fiberglass cloths, who would venture to say what cloth # is that shows on the transom?
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With the plate out of the way, I can do the grinding in preparation for the transom supports.

 

[Scott Danforth]

5015 debonder from worst marine works to loosen the bond of 5200

 

[redneck joe]

5015 debonder from worst marine works to loosen the bond of 5200

Ok i understand the words but not the process?

 

[Scott Danforth]

Ok i understand the words but not the process?

Buy can


Spray on offending part glued on with 5200

Wedge tool behind part

Spray some more

Drink a beer

Part falls off

Use putty knife to clean up

 

[redneck joe]

Ah, I missed the drink beer part....

 

[tpenfield]

I picked up the Hull & Deck Putty this AM . . .

It is poly-based, but hopefully will be OK, considering I'll be scarf joining the extension bracket to the hull as well as my 50 +/- bolts.


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My plan will be to start the putty cold (60˚F ish) to slow it down, then add heat to the E-B once it is secured.

In the fine print it says you are not supposed to drink while using it . This could be a problem, but perhaps a few beers afterwards.
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[flashback]

Why didn't you get the #405, seems it has a longer working time? Living on the edge eh.

 

[tpenfield]

Why didn't you get the #405, seems it has a longer working time? Living on the edge eh.

Because the place only had the #400 . . . I can play temperature games to extend the open time.

 

[tpenfield]

I am cutting the Coosa board for the additional stringers and transom supports.

I have another unit of measure for @redneck joe . . .

These 2 pieces are supposed to be the same dimension, but the one up top is off by a 'smidge' . . .
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[Scott Danforth]

you used the CH tape on one and the RCH on the other?

 

[tpenfield]

you used the CH tape on one and the RCH on the other?

No I used the red & black measuring tape on both . . . Just a smidge off.

 

[tpenfield]

A day of cutting and grinding . . . . I got a lot of the transom reinforcement structure cut . . . still a few more pieces to go.
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I hope to be glassing this in over the next couple of days.

 

[alldodge]

No engineer here
I'm seeing the many structural supports built into the OB structure. Don't see how that will ever have a chance of failing. The boat came with twin 6.2's which has max HP rating of 350. All the force was placed on the original holes placed close together and there is no design error

Now there is a structure fastened to the same transom and moving most of the force away from the center keel.

Why does it need that much more support inside the boat?