LM 18 SSI GA

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Cbuf
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Re: LM 18 SSI GA

Post by Cbuf »

What HP did you go with?

Looks great.


See my LM 18 build here.
viewtopic.php?f=12&t=64254
See my LM 18 Questions here.
viewtopic.php?f=2&t=64299&hilit=lm18\
Finished Boat Here
viewtopic.php?f=25&t=65173

Edd
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Re: LM 18 SSI GA

Post by Edd »

Cbuf wrote: Mon Nov 28, 2022 4:51 pm What HP did you go with?

Looks great.
Suzuki 30, I was trying to keep it light.

Cbuf
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Re: LM 18 SSI GA

Post by Cbuf »

Is that a 4 blade prop? I tried several props and because the boat is so light I found that a 3 blade is much faster and the boat doesn't require the lift of the 4 blade. Just food for thought. I would think you should be able to hit 30 mph especially because you built light.

great job.
See my LM 18 build here.
viewtopic.php?f=12&t=64254
See my LM 18 Questions here.
viewtopic.php?f=2&t=64299&hilit=lm18\
Finished Boat Here
viewtopic.php?f=25&t=65173

Edd
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Re: LM 18 SSI GA

Post by Edd »

Cbuf wrote: Tue Nov 29, 2022 10:23 am Is that a 4 blade prop? I tried several props and because the boat is so light I found that a 3 blade is much faster and the boat doesn't require the lift of the 4 blade. Just food for thought. I would think you should be able to hit 30 mph especially because you built light.

great job.
It’s just the stock aluminum prop. I’d like to try another one. I messed up when I mounted the Jack plate and the engine sits too low. The cavitation plate is about 2” below the hull with it jacked all the way up. It should help when I get that straightened out.

Cbuf
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Re: LM 18 SSI GA

Post by Cbuf »

If it helps I built mine heavy, ( Livewell, trolling motor, poling platfoam, with a 50 hp). My cavitation plate is about 1.5 inch above the bottom and I'm thinking of going one more hole up. Also, the transom as designed (or at least how I built it) was too steep. I had to install motor shims to get more negative trim.
See my LM 18 build here.
viewtopic.php?f=12&t=64254
See my LM 18 Questions here.
viewtopic.php?f=2&t=64299&hilit=lm18\
Finished Boat Here
viewtopic.php?f=25&t=65173

Edd
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Re: LM 18 SSI GA

Post by Edd »

The negative trim is good. I definitely need to get it lifted though.

TomW1
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Re: LM 18 SSI GA

Post by TomW1 »

Chuf, when you tried your 4 blade props were there pitch size at least 2" smaller than your 3-blade pitch. The most in speed you should lose is 2-3 mph. Edd if you would like I would be glad to work up a new prop size for you if you would like. Tom
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978

Reid
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Re: LM 18 SSI GA

Post by Reid »

Edd,

Really nice job on the LM!!!! Always nice to see some fish in the cooler!

-Reid
Someone asked me, if I were stranded on a desert island what book would I bring... "How to Build a Boat."
- Steven Wright

Edd
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Re: LM 18 SSI GA

Post by Edd »

TomW1 wrote: Thu Dec 01, 2022 8:07 pm Chuf, when you tried your 4 blade props were there pitch size at least 2" smaller than your 3-blade pitch. The most in speed you should lose is 2-3 mph. Edd if you would like I would be glad to work up a new prop size for you if you would like. Tom
Yeah I’m open to suggestions, thanks 👍🏻

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