I/O (Sterndrive) Conversion to Outboards

[redneck joe]

Ted, leave room for fairing

Remind us neophytes what fairing is.

 

[Pmt133]

Its that thing people do to experience the Renaissance but with modern amenities.

 

[Scott Danforth]

Fairing is the correct term for slapping body filler on the fiberglass and making it ssmmmmoooooottthhhhhh

 

[redneck joe]

Its that thing people do to experience the Renaissance but with modern amenities.

I did that in Tampa a couple years ago and since my wife was not with me she could not stop me from buying the kilt.

 

[redneck joe]

 

[tpenfield]

Fairing is the correct term for slapping body filler on the fiberglass and making it ssmmmmoooooottthhhhhh

In search of flatness. . . .

OK, the transom as it is now is not very flat.
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Most likely from lamination overlaps, etc.

I am not sure fairing compound (I have a source for VE fairing compound), is the right thing for the mounting area of the outboard. . . but maybe it is.

'Plan B' would be to take a 'flat' piece of something, bigger than the OB mount footprint, and mix up some fiber-strand paste and use the flat piece as a 'surface mold' to give a nice flat area, just where needed.

I think I would need about a 20"x15" piece of flatness based on the engine mount footprint.
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Thoughts?

 

[tphoyt]

I like the fiber strand plan over the faring compound alone.

 

[Pmt133]

Do they have a measurement for how flat it needs to be like the I/Os?

 

[Scott Danforth]

Ted, make some PB and use that to fair the surface vs micro-spheres

your fiberglass shop will also have kitty hair or tiger hair

 

[tpenfield]

Do they have a measurement for how flat it needs to be like the I/Os?

Do they have a measurement for how flat it needs to be like the I/Os?

I believe the I/O spec is thickness and how 'parallel' the inside & outside surface need to be.

I'm trying to find what outboard motors need, but I would imagine it mainly applies to the outside surface.

 

[Scott Danforth]

I believe its supposed to be flat within 1.5mm over a 1 meter length (with a straight-edge). but that is memory.

then I recall a 3mm parallel requirement (which doesnt make sense for parallel)

I would want the transom flat where the motor clamp sits on the outside from a loading standpoint.

 

[redneck joe]

Just more fiberglass seem to be sensible? Why use a non structural filler?

 

[Pmt133]

Just send it. What could possibly go wrong...

 

[flashback]

Do they bed the engines in anything.?

 

[tpenfield]

Do they bed the engines in anything.?

IDK . . . probably nothing other than sealant.

 

[tpenfield]

OK, my fiberglass estimates have been way low and I am heading out to grab another pail of resin and another roll of 1708 should arrive today.

I took a look at what I've used and it is adding up (resin vs. cloth), but it seems that making things thick really uses up the materials, since each layer of fiberglass yields about 1/20th of an inch in thickness.

Here are my numbers of material usage . . .

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I figured based on the cloth usage, how much resin I should have used.

So, 30 gallons used and I can account for just about all of it (figuring fillets was probably a gallon) . . . so 29+1=30 !

I just hope the end of material buying is near . . .

 

[Scott Danforth]

I just hope the end of material buying is near . . .

Raw materials maybe........ then rigging hardware, bilge pumps, plumbing, EVA foam....

 

[Pmt133]

Wish you were closer. You could have the rest of my CSM and 1708. It's odd, I can't really give the stuff away it seems.

 

[FLATHEAD]

Had some time yesterday to catch up on this thread. Outstanding work. Looking forward to when you attach it.