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Old 09-11-2016, 04:22 PM   #641
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Looking good .


1983 Present 42 Sundeck
Twin Lehman 135's
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*Present 42 twin 135 Lehmans
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Old 09-13-2016, 04:59 PM   #642
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Just a video today: https://youtu.be/-78OG97mM8E
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Old 09-13-2016, 06:26 PM   #643
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What are your thoughts on adding a couple knees in there to help brace the bulk head to prevent flexing.Maybe my over engineering thinking.
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Old 09-14-2016, 10:38 AM   #644
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What are your thoughts on adding a couple knees in there to help brace the bulk head to prevent flexing.Maybe my over engineering thinking.
You mean something like this?



No!

I don't think it'll need it. If it shows any signs of weakness I'll through bolt them to the stringers.

Web log updated: https://she-kon.blogspot.ca/2016/09/...d-tattood.html
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Old 09-14-2016, 02:35 PM   #645
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I was thinking bulk head to the stringer knee,but looking at the bulk head close up,it's way thicker than I first thought it was.I don't remember reading what thickness the bulk head for the drive is.I was thinking a half inch.Looking at your pic there,in the right lower corner,it appears to be 1+ inches thick.Gosh,I need to learn metrics better.
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Old 09-15-2016, 07:27 AM   #646
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I was thinking bulk head to the stringer knee,but looking at the bulk head close up,it's way thicker than I first thought it was.I don't remember reading what thickness the bulk head for the drive is.I was thinking a half inch.Looking at your pic there,in the right lower corner,it appears to be 1+ inches thick.Gosh,I need to learn metrics better.
It's 1" thick. That's 25.4 mm for the rest of the world! I added a double but guess didn't explain that.

Shear strength for 1/2" ply is pretty high. Can't remember exactly what. The math escapes me. The maximum load on the thrust bearing would be approx. .6 total weight of the boat and that's not taking into account hull coefficient of friction or prop slippage or any of those useless details!
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Old 09-15-2016, 12:05 PM   #647
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I'm glad you did the hard math.That stuff makes my brain hurt and short out.
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Old 09-15-2016, 12:18 PM   #648
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Thrust bearing mocked up and mounted. Just waiting on rudder & skeg to return from the machine shop.



Few more doodley doo's in today's blog updated: https://she-kon.blogspot.ca/2016/09/con ... -saga.html

Carry on....
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Old 09-15-2016, 12:49 PM   #649
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Looking good . Very nice work.
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Old 09-15-2016, 01:03 PM   #650
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Looks like it came together pretty good.I can't wait until you fly in the engine.
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Old 09-15-2016, 01:07 PM   #651
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Should have went with a Kitchen rudder.Maybe over kill.

https://en.wikipedia.org/wiki/Kitchen_rudder

https://youtu.be/L-tpFo9C4zE
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Old 09-15-2016, 01:58 PM   #652
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Should have went with a Kitchen rudder.Maybe over kill.
If I ever replace the rudder it'll be with one of these!

https://youtu.be/_mUbY1XAc8E
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Old 09-15-2016, 03:03 PM   #653
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The kitchen rudder operates much like a thrust reverser on a jet engine. We affectionately called them buckets. I love the concept of vectored thrust in reverse. But they lack any propeller flow over the surfaces in their forward setting so you'd only get fwd steerage with fwd movement. Not always what you want or need in docking.

The articulated rudder will provide excellent steerage in fwd and provide enough side force to function like a stern thruster at full rudder.

Maybe someone will combine both systems to provide exceptional maneuverability in forward and reverse.

Great work and thread!
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Old 09-15-2016, 08:57 PM   #654
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If I ever replace the rudder it'll be with one of these!

https://youtu.be/_mUbY1XAc8E

That's a nice unit as well.
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Old 09-15-2016, 09:05 PM   #655
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The kitchen rudder operates much like a thrust reverser on a jet engine. We affectionately called them buckets. I love the concept of vectored thrust in reverse. But they lack any propeller flow over the surfaces in their forward setting so you'd only get fwd steerage with fwd movement. Not always what you want or need in docking.

The articulated rudder will provide excellent steerage in fwd and provide enough side force to function like a stern thruster at full rudder.

Maybe someone will combine both systems to provide exceptional maneuverability in forward and reverse.

Great work and thread!

One tug I worked on had two rudders, one on either side and astern of a big single screw. The rudders had a really big range of motion, something like 135 degrees, and could move independently of one another. You could direct thrust in just about any direction. You could even get the boat to move straight astern with the engine clutched ahead. It's a really handy system. Made her very maneuverable.
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Old 09-16-2016, 11:28 AM   #656
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Proper fitted Python Drive. One of the other builders who installed on in his TW28 spotted my error.



I do remember reading the instructions. It was about 6 yrs ago! The date on the invoice for the unit was December 10, 2009.

Ain't nobody got time for reading instructions!

https://she-kon.blogspot.ca/2016/09/rtfm.html
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Old 09-16-2016, 07:28 PM   #657
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Good catch by Peter! Always nice to have another set of eyes.
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Old 09-17-2016, 08:08 AM   #658
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Good catch by Peter! Always nice to have another set of eyes.
Oh for sure. Especially a set of eyes who've already built one of these! Peter's TW28 'Luka' launched last year.



Thanks for looking in.

Cheers!
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Old 09-17-2016, 12:46 PM   #659
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Spilled more paint!

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Old 09-17-2016, 02:40 PM   #660
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Rick:
How did you seal the limber holes?
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