reduce 1/8 scale to sport 20

[Terry Flynn]

Hi guys.

I have a question and I hope it don't sound to dumb.

I bought a set of Newton plans and I wont to shrink them down to sport 20 size. Is there a formula for this or can someone tell me how much to reduce them.

Thanks for help

Terry

 

[missbudpilot55]

Terry,

To get the % of ratio you need to reduce them by divide the length that you want the sport 20 to be by the length of the boat on the full size drawing

example: 30 divided by 43 = .70 (rounded off) 43 x .70=30.1"

You should have a Kinko's locally or close by, take the plan to them and ask them to help you reduce it to 70% and presto you have a set of smaller plans. Here in the Baton Rouge area they charge about 66 cents a square foot to copy & reduce large drawings.

Hope this helps.

 

[Terry Flynn]

Yes it does. just what I was looking for.

Thank you

Terry

 

[P THOMAS]

Remember that you will want to redraw the bulkheads to make the engine well 4 inches wide. should be only 1/4 inch on each side 5 x .70 = 3.5 If the original plan had a 5 inch engine well.

What scale boat are you working with?

 

[Terry Flynn]

Remember that you will want to redraw the bulkheads  to make the engine well 4 inches wide.  should be only 1/4 inch on each side  5 x .70 = 3.5    If the original plan had a 5 inch engine well.
What scale boat are you working with?

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It's the U-10 Winston Eagle 1989, Plan #157

 

[P THOMAS]

[It's the U-10 Winston Eagle 1989, Plan #157

84446[/snapback]

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Is that the rigger style? In sport 40 that is not an allowed hull but if you want to build a 20 its up to you, knowing that when IMPBA sport20 rules come out it wont be allowed to race.

 

[Terry Flynn]

I was afraid of that. I was reading the rules for the internats and it said on rigger or modified rigger or canard hulls. but it also says that Hull must be a 3 point hydro configuration and resemble a limited or an unlimited hydro. that's what this boat is. it's not a rigger that someone made to resemble a hydro? Just my opinion. Not that it means anything

 

[P THOMAS]

I was afraid of that. I was reading the rules for the internats and it said on rigger or modified rigger or canard hulls. but it also says that Hull must be a 3 point hydro configuration and resemble a limited or an unlimited hydro. that's what this boat is. it's not a rigger that someone made to resemble a hydro? Just my opinion. Not that it means anything 

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Yes that is only for this years internats they want to cover someone that may have a boat to run. The rule proposal for sport20 hydro is posted on the forum.

 

[Shnick]

Hey Terry... i got an idea...

http://www.angelfire.com/mb/powerboats/turbine.html

go 1/5th scale... turbine power.... lol

Shnick

 

[Finne]

Hey Terry... i got an idea...

http://www.angelfire.com/mb/powerboats/turbine.html

go 1/5th scale... turbine power.... lol

Shnick 

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ooooh i want!!! :blink: :huh: :blink:

 

[Propjockey]

NOW we're talkin' SCALE! NICE!!

 

[Terry Flynn]

Hey Terry... i got an idea...

http://www.angelfire.com/mb/powerboats/turbine.html

go 1/5th scale... turbine power.... lol

Shnick 

84742[/snapback]

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That is wicked!!! would love to see it run