Question, NACA Foil in CNC flexible foam

[fluknick]

Hey all,
I haved burned some time on the search feature without success, so now I ask...

There was a previous thread where an individual used a foam NACA foil surface with a keel core ( I believe, my memory ). The foam was made out of a flexible material- the intent was encapsulating the whole thing in carbon fiber and epoxy.

My questions:
If anyone has this thread, could you provide a link ?
Is anyone aware of what company does CNC foil surfaces ( USA, preferred ) ?
What flexible foam material would this have been ?

Thank you in advance.
Nick

 

[Tops]

Welcome to the forum Nick.
Assuming you meant 'steel core' instead of 'keel core'.

If the rudder is to have a skeleton and be laminated in carbon and epoxy, I don't know why the foam would need to be flexible.

Here is how Foss Foam in FL makes them:
Rudder Construction https://www.newrudders.com/rudder-construction/

Here is a one-off carbon fiber with CNC cut molds, etc.:
https://explorecomposites.com/example-projects/building-yacht-rudders/

Do you have any ins with foam suppliers and machine shops suited for your project?

 

[fluknick]

I did mean "keel" as it was a lifting keel and I'm not certain the actual material- i only remember the highlights and what bewildered me; mainly the flexible cnc naca foam.
I wish I could find the thread, but I appreciate the info, definitely.

Thank you !
Merry Christmas

 

[Tops]

I did mean "keel" as it was a lifting keel and I'm not certain the actual material- i only remember the highlights and what bewildered me; mainly the flexible cnc naca foam.
I wish I could find the thread, but I appreciate the info, definitely.

Thank you !
Merry Christmas

Likewise!
My bad, my brain jumped to rudder instead of keel.

 

[BlueBell]

@fluknick,

I don't know the thread but I have done this on a 7 1/2' retractable, swing centre-board.
I had an XPS foam board CNC'ed to a NACA foil. Epoxy glassed it, hand lay-up.
Other than some strategic webbing inserts, it was very straight forward.