JAE 45 turnfin dimensions

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Rod Fonda

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Apr 30, 2021
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110
Just trying to find out the best or recommended fin depth , from the waterline to bottom of curve as I'm making a staino fin from .050" plate,that attaches to a 1/8" alum plate, above the waterline,and bolted to the sponson for some reduced weight,added stiffness and more adjustability,,I guesstimated the original fin I made from alum,,and it's maybe a bit deeper than necessary and extra drag,although it turns well/tight,,also a good or recomended lenght from lead edge to trail would help me,,I'm assuming the LE and TE are fairly parallel,,cheers
 

Rod Fonda

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Joined
Apr 30, 2021
Messages
110
just order one from CD Machine ,(David Preusse).
Thanks for the advice Ron,but my tub height and centreline are higher than a stock jae,and my mounting holes might be different,and probably need a longer fin than stock,so I was trying to get an idea on fin depth below the waterline to use as a datum point for the overall lenght needed
 

Ron Zaker Jr

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Nov 26, 2002
Messages
1,473
Thanks for the advice Ron,but my tub height and centreline are higher than a stock jae,and my mounting holes might be different,and probably need a longer fin than stock,so I was trying to get an idea on fin depth below the waterline to use as a datum point for the overall lenght needed
Ok not sure why you raised tub height ,but ok.
 

Rod Fonda

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Joined
Apr 30, 2021
Messages
110
Ok not sure why you raised tub height ,but ok.
Just my dislike of water filling up the engine compartment when the boat stops and floats,,lol,,I made the tub sides around 2",,performs well otherwise,and easy to build,,a credit to you guys that designed it,,If you could give me an idea of how much of the fin is in the water,,I'd appreciate it,,cheers
 

Ron Zaker Jr

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Joined
Nov 26, 2002
Messages
1,473
Just my dislike of water filling up the engine compartment when the boat stops and floats,,lol,,I made the tub sides around 2",,performs well otherwise,and easy to build,,a credit to you guys that designed it,,If you could give me an idea of how much of the fin is in the water,,I'd appreciate it,,cheers
i will check tonight
 

Ron Zaker Jr

Well-Known Member
Joined
Nov 26, 2002
Messages
1,473
Just my dislike of water filling up the engine compartment when the boat stops and floats,,lol,,I made the tub sides around 2",,performs well otherwise,and easy to build,,a credit to you guys that designed it,,If you could give me an idea of how much of the fin is in the water,,I'd appreciate it,,cheers
3 inches wide x 1-7/8 deep
 

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