I/O (Sterndrive) Conversion to Outboards

[redneck joe]

. . . and round is better than square.

I knew round was best!!

 

[tpenfield]

It was supposed to rain this AM, but the rain held off 'til PM . . .

I got some more pieces cut.

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The extra 'stringers' are in line with the engine locations and notched for the splash well. I'm running short on the Coosa, but will see how much more is needed. I got a 1" thick sheet and a 1/2" thick sheet as well as a partial sheet left. We shall see how it goes . . .

 

[harringtondav]

Today I played trailer moving games . . . I want to see if I can get a decent balance point & manageable tongue weight.
View attachment 412738
The boat was about 6" off-center (to port) when we pulled the boat out of the water. So that was the first order of business. Once I got the boat lifted up in the air, I used my chain hoist to 'pull' the trailer to port . . . that was fun.

Then I 'very carefully' moved the trailer forward . . . about 20". So, I'll lower the boat and see what I have for tongue weight. As mentioned by several folks, I can always put some weight at the stern for transport to the re-power shop, then get rid of it once at the shop.

So the boat is 20" back of its normal position on the trailer. I just need to lower it and check the tongue weight. The trailer itself (no load from the boat) has a tongue weight of 350 lbs.

I just tuned in to this post. ....Nice project.
I haven't gone through all of the threads, so you probably explained this earlier:
This is going to move a lot of weight a long distance aft. What do you expect as far as floating waterline, planing, etc.

 

[tpenfield]

I was thinking about you the other day, good to 'see' you . .

Yes, Page 7 , post #130 . . .

I calculated the center of balance will move aft by 9 inches . . . the stern will be up by about 2 inches.

Total weight goes down by about 500 lbs.

 

[harringtondav]

I was thinking about you the other day, good to 'see' you . .

Yes, Page 7 , post #130 . . .

I calculated the center of balance will move aft by 9 inches . . . the stern will be up by about 2 inches.

Total weight goes down by about 500 lbs.

I have no doubts that your weight calcs are spot on. ....previous experience with you on this still stings a bit.

 

[harringtondav]

It was supposed to rain this AM, but the rain held off 'til PM . . .

I got some more pieces cut.
View attachment 413112
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The extra 'stringers' are in line with the engine locations and notched for the splash well. I'm running short on the Coosa, but will see how much more is needed. I got a 1" thick sheet and a 1/2" thick sheet as well as a partial sheet left. We shall see how it goes . . .

Another question: Will you fully enclose this to extend the hull to the end? ...also the new mini 'transom'?

 

[tpenfield]

Another question: Will you fully enclose this to extend the hull to the end? ...also the new mini 'transom'?

The hull gets partially extended by 3.5 feet, it is not a full width extension. This is often called an extension pod.

 

[alldodge]

Might post your stuff on OSO swap page

 

[Scott Danforth]

Yes, please and thank you . . .

You got mail..... yeah you got mail

 

[Scott Danforth]

Thinking about next steps . . .


Sort of like this . . . bolt holes shown 1 side for illustration purpose.
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View attachment 413093
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the aluminimum versions as made by Armstong use regular plastic deck hatch covers on top. usuall the 6-3/4" or 8", however some have used larger.

usually the ones with the big plastic screw so they dont have to deal with hardware.

 

[tpenfield]

Might post your stuff on OSO swap page

I had not thought of that. . . . Maybe will pick up someone re-powering a go fast . . .

 

[alldodge]

I had not thought of that. . . . Maybe will pick up someone re-powering a go fast . . .

Folks buy/sell all kinds on stuff including 4cyl and Alpha drives. Their not all go fasters

 

[tpenfield]

I'm working inside the garage today, as there is off & on rain. The space is a bit cramped, but I'll make do.

As for the remaining large pieces, I have 5 more to go . . .

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#1-3 will be 1/2" thick sheet and the #4 & 5 will be the 1" sheet. Then I got to double-up the #5 panel to get towards my planned transom thickness.

I may need a bit more foam board for stiffeners, spacers, the main transom structure mod, then some odds & ends. Not sure that I need the Coosa BW26 or just a regular foam core material. Trying not to spend a King's ransom on additional foam boards . . . any ideas or sources are welcome.

I checked my dimensions for symmetry, etc. . . everything is about +/- 0.1", better than I expected.

 

[tpenfield]

As for the foam boards . . . never mind . . . I got some good pricing on general purpose Divinycell

 

[Scott Danforth]

Ted, one thing that popped in my head, the armstrong pods have a bilge pump

make sure you have some limber holes in the stringers / braces and a pad for a bilge pump.

 

[tpenfield]

Ted, one thing that popped in my head, the armstrong pods have a bilge pump

make sure you have some limber holes in the stringers / braces and a pad for a bilge pump.

Yes, absolutely . . . already in the plan.

Meanwhile . . . the waters are rising
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It looks like I won't be cutting any more big pieces today.

 

[tpenfield]

The waters subsided and I was able to get the 2 'planing surface' pieces done.
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They will stay loose for the time being, as I'll need access to the insides. Tomorrow should be the transom pieces.

 

[redneck joe]

why the cutout on the two inward pieces

 

[tpenfield]

why the cutout on the two inward pieces

Some ask why, I often ask why not . . .

Gonna be sort of a splash well, but it is really to access the top mounting bolts of the engines and clearance for rigging (steering actuators)

 

[Scott Danforth]

Ted, are you going to build boxes on teh little wings for boarding ladders?