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Best NACA foil for daggerboard?

Ticktack

Member
Hello All, I purchased an aftermarket daggerboard & out of curiosity, I made a plaster template of the foil shape which indicated the max thickness is at about 50%!
I was wondering if someone a lot smarter than me could recommend an NACA foil that I could use to give the board a more desirable shape?
I looked at the class rules but nowhere could I find any specs. addressing the actual “”shape” of the board, only the dimensions.
Thanks so much!
Tom
 

aborgman

Member
You'll want a symmetric foil so... a common one for this would be a NACA 0012.

Problem is - a NACA 0012 is too wide at a 9.5" chord to fit in the daggerboard slot.

A NACA 0009 will fit, or a NACA 0012 with the thickness chopped down 27/32"
 

Ticktack

Member
You'll want a symmetric foil so... a common one for this would be a NACA 0012.

Problem is - a NACA 0012 is too wide at a 9.5" chord to fit in the daggerboard slot.

A NACA 0009 will fit, or a NACA 0012 with the thickness chopped down 27/32"
Awesome, I’ll look at the NACA 0009, I wonder if the official Sunfish board is similar to it?
Thanks again!
Tom
 

Ticktack

Member
Awesome, I’ll look at the NACA 0009, I wonder if the official Sunfish board is similar to it?
Thanks again!
Tom
You'll want a symmetric foil so... a common one for this would be a NACA 0012.

Problem is - a NACA 0012 is too wide at a 9.5" chord to fit in the daggerboard slot.

A NACA 0009 will fit, or a NACA 0012 with the thickness chopped down 27/32"
Wow, the NACA 0009 is a good looking foil,
This is very exciting for me! How could I get it sized to the 9.5” chord needed with the Sunfish board?
Thank you So much!!
Tom
 

nickzup

New Member
Wow, the NACA 0009 is a good looking foil,
This is very exciting for me! How could I get it sized to the 9.5” chord needed with the Sunfish board?
Thank you So much!!
Tom
www.airfoiltools.com has excellent plotting tools and low Re data for a bunch of NACA airfoils. Linked here is the plotting tool for the NACA 0009, where you can change the cord length and export a pdf template or set of coordinates that are properly to scale. Now, manufacturing a board with the exact airfoil would be more tricky and nothing easy comes to mind. I'm sure some other folks can make suggestions for this part!
 

nickzup

New Member
3D print a negative half section about an inch wide and use it as a template.

Here is a quick thrown together negative half of a NACA 0009 if you have access to a 3D printer:

This is a great idea! @Ticktack let us know how it comes out if you decide to give it a go.

@aborgman Do you happen to work at Umich Aero? I think you helped my 405 team last fall with getting that huge blue DC power supply out of Gamba's lab for our project. Small world! :D
 

Ticktack

Member
3D print a negative half section about an inch wide and use it as a template.

Here is a quick thrown together negative half of a NACA 0009 if you have access to a 3D printer:

T
3D print a negative half section about an inch wide and use it as a template.

Here is a quick thrown together negative half of a NACA 0009 if you have access to a 3D printer:

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3D print a negative half section about an inch wide and use it as a template.

Here is a quick thrown together negative half of a NACA 0009 if you have access to a 3D printer:

aborgman, Thank you so much, that is exactly what I was looking for. I’ll see if I can get that printed & will let you how it turns out!
Tom
 
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