Boat Builder Central - Builder Forums

NaplesEuroTech728 wrote: ↑Tue Nov 09, 2021 7:19 pm Hi all!

I'm new here but have been browsing plans and kits here for years since the days of bateau.com

I'm finally to the point of getting ready to pull the trigger and love the LM18 for its draft and wide beam than the FS18 that I've always loved but I'm limited to 20hp and a smaller storage space so I'd like to scale it down 10% shorter without changing the beam.

Will this horribly affect performance and handling? And would i have to have the plans resized professionally to maintain hull proportions?

Thanks for any input,
Alexa

NaplesEuroTech728 wrote: ↑Wed Nov 10, 2021 10:24 am Reid,
Thank you for your input. I have looked at it and teeter tottered back and forth. My only concern with the fs14-ls is that i commonly fish with my wife and I'm concerned about the space with 2 anglers

NaplesEuroTech728 wrote: ↑Wed Nov 10, 2021 5:18 pm Jeff,
I love your boat and the sizing of it

How did you go about scaling it up?

VT_Jeff wrote: ↑Wed Nov 10, 2021 8:08 pm

NaplesEuroTech728 wrote: ↑Wed Nov 10, 2021 5:18 pm Jeff,
I love your boat and the sizing of it

How did you go about scaling it up?

Thanks! It's a great little boat: carries the two of us with ease but is small enough to paddle like a SUP when called for. I should have moved my B frame forward so my client-wife has more foot room, or else made my consertical instead of swept, which would have reduced my footroom very slightly but increased hers quite a bit(though this would move weight rear-ward, so maybe not)

The scaling is pretty simple: go through each measurement on the plans, add 10%, cross off the old measurement and write in the new one. To easily calc the 10%, I created a spreadsheet that let me enter the inches, 1/2 inches, 1/4 inches and 1/8 inches and it would output the new measurement in inches, 1/2, 1/4, 1/8 etc.
thSo if I input 20 3/8, I'd get 27 3/4 output.

It's a bit slow, but effective.

Don't scale the transom height!

VT_Jeff wrote: ↑Wed Nov 10, 2021 8:08 pm

NaplesEuroTech728 wrote: ↑Wed Nov 10, 2021 5:18 pm Jeff,
I love your boat and the sizing of it

How did you go about scaling it up?

Thanks! It's a great little boat: carries the two of us with ease but is small enough to paddle like a SUP when called for. I should have moved my B frame forward so my client-wife has more foot room, or else made my console vertical instead of swept, which would have reduced my footroom very slightly but increased hers quite a bit(though this would move weight rear-ward, so maybe not)

The scaling is pretty simple: go through each measurement on the plans, add 10%, cross off the old measurement and write in the new one. To easily calc the 10%, I created a spreadsheet that let me enter the inches, 1/2 inches, 1/4 inches and 1/8 inches and it would output the new measurement in inches, 1/2, 1/4, 1/8 etc.

So if I input 20 3/8, I'd get 27 3/4 output.

It's a bit slow, but effective.

Don't scale the transom height!

NaplesEuroTech728 wrote: ↑Thu Nov 11, 2021 7:16 am

VT_Jeff wrote: ↑Wed Nov 10, 2021 8:08 pm

NaplesEuroTech728 wrote: ↑Wed Nov 10, 2021 5:18 pm Jeff,
I love your boat and the sizing of it

How did you go about scaling it up?

Thanks! It's a great little boat: carries the two of us with ease but is small enough to paddle like a SUP when called for. I should have moved my B frame forward so my client-wife has more foot room, or else made my console vertical instead of swept, which would have reduced my footroom very slightly but increased hers quite a bit(though this would move weight rear-ward, so maybe not)

The scaling is pretty simple: go through each measurement on the plans, add 10%, cross off the old measurement and write in the new one. To easily calc the 10%, I created a spreadsheet that let me enter the inches, 1/2 inches, 1/4 inches and 1/8 inches and it would output the new measurement in inches, 1/2, 1/4, 1/8 etc.

So if I input 20 3/8, I'd get 27 3/4 output.

It's a bit slow, but effective.

Don't scale the transom height!

That sounds easy enough but is that truly 10% scale? If my math is correct 20 3/8" scaled up 10% should land around 22 7/16"

NaplesEuroTech728 wrote: ↑Thu Nov 11, 2021 7:16 am That sounds easy enough but is that truly 10% scale? If my math is correct 20 3/8" scaled up 10% should land around 22 7/16"

pee wee wrote: ↑Thu Nov 11, 2021 1:10 pm . . . and there's a good example of why the metric system is better for scaling boat plans! Get the metric plans (some plans come with both systems of measurement), it's much easier to work with. 2.7 meters x 1.1 is easier to figure (less likely to make an error) than feet, twelfths of a foot (inches) and eights, quarters or halves of an inch. Buy a metric tape measure and you'll be set.

jonnymac wrote: ↑Thu Nov 11, 2021 1:39 pm

pee wee wrote: ↑Thu Nov 11, 2021 1:10 pm . . . and there's a good example of why the metric system is better for scaling boat plans! Get the metric plans (some plans come with both systems of measurement), it's much easier to work with. 2.7 meters x 1.1 is easier to figure (less likely to make an error) than feet, twelfths of a foot (inches) and eights, quarters or halves of an inch. Buy a metric tape measure and you'll be set.

I agree, but some people can’t make the shift. Even with metric I would still use a spread sheet to calculate the dimensions. I would put every dimension in a column, formula that applied the change in a second. Its faster than by hand and less error prone.

VT_Jeff wrote: ↑Thu Nov 11, 2021 2:06 pm

jonnymac wrote: ↑Thu Nov 11, 2021 1:39 pm

pee wee wrote: ↑Thu Nov 11, 2021 1:10 pm . . . and there's a good example of why the metric system is better for scaling boat plans! Get the metric plans (some plans come with both systems of measurement), it's much easier to work with. 2.7 meters x 1.1 is easier to figure (less likely to make an error) than feet, twelfths of a foot (inches) and eights, quarters or halves of an inch. Buy a metric tape measure and you'll be set.

I agree, but some people can’t make the shift. Even with metric I would still use a spread sheet to calculate the dimensions. I would put every dimension in a column, formula that applied the change in a second. Its faster than by hand and less error prone.

Agreed. Working in metric has clear advantages when scaling, but for me, I was not going to make that shift to a metric tape measure etc. Which is why I did the pre-work to calculate/scale every measurement on the plans and then build in inches and feet. A day or so of work with the plans and a spreadsheet was a lot easier than months of adjusting to metric.

NaplesEuroTech728 wrote: ↑Thu Nov 11, 2021 5:32 pm I'm glad I reached out to all of you guys before i pulled the trigger!!

Metric measurement isn't an issue for me at all. Im a BMW and Mercedes technician by trade and have been since I was 18.....

Thanks everyone,
Alexa