UK-Cherub Forum

Cherub Chat => Tech Chat => Topic started by: ross_burkin on March 04, 2012, 03:53:16 PM

Title: 3D models of t-foils and dagger boards.
Post by: ross_burkin on March 04, 2012, 03:53:16 PM

Does anyone have any 3D models of a t-foil and a dagger board that I can have? Preferably for free, I guess there would designer royalties on foil shapes.

The intention is to CNC the profiles at college. Most file types are supported by our programming software (AlphaCam).

Thank you!

Title: Re: 3D models of t-foils and dagger boards.
Post by: roland_trim on March 04, 2012, 07:33:13 PM

Ross, it will not take you very long to draw some up. For ready brew then Kevin E. is your man - his royalty vs time invested ratio makes it worth investing in....

Title: Re: 3D models of t-foils and dagger boards.
Post by: Phil Alderson on March 05, 2012, 12:46:25 PM

I did a 3d model of a T-foil a few years ago in Blender, I could have a look, but they don't take long to do.

Title: Re: 3D models of t-foils and dagger boards.
Post by: Ben Howett on March 05, 2012, 12:53:39 PM

Ross, if you have something specific in mind id be happy to put it together into a 3d model for you. If your after a standard section it wont take more than 15mins to build a model for the daggerboard - maybe a little longer for the Tfoil depending on design.

Custom section design is another kettle of fish but your into diminishing returns there...

Title: Re: 3D models of t-foils and dagger boards.
Post by: Andrew Whapshott on March 05, 2012, 06:18:37 PM

I can do one in Maxsurf fairly easily with a standard section...

Title: Re: 3D models of t-foils and dagger boards.
Post by: ross_burkin on March 07, 2012, 04:17:45 AM

Thanks for the replies guys. I'm not totally sure how to go about drawing foils but I guess I could have a go with a bit of guidance.

For the t-foil i'm not after anything special, just a section that works!

Dagger board, ask Stuberry. It'll be for him.

Title: Re: 3D models of t-foils and dagger boards.
Post by: Ben Howett on March 07, 2012, 03:24:22 PM

This is a NACA 63a012 section - its a modified 63 series with the concave section removed and a 12% t/c ratio. Its probably not the absolute best section available, but without looking at the numbers I would think its not too far off what youd want.

1600mm span here with a 250mm root chord, going down to 75mm at the tip with a semi-eliptical leading edge and a straight trailing edge.

Is that something like what you were after? Im a bit out of the loop with the current trends for cherub foils...


(http://s17.postimage.org/vgp91xfmj/rossdaggerboard1.jpg) (http://postimage.org/image/vgp91xfmj/)

Title: Re: 3D models of t-foils and dagger boards.
Post by: Ben Howett on March 08, 2012, 12:35:09 PM

Your t-foil might look something like this...

This is the same 63a012 vertical section - Root chord 190mm, span 1100mm.
Horizontal foil is a H105 - Root chord 110mm, Tip Chord around 50mm, span 900mm

Again - this is pretty much a first guess - the H105 works as a lifting section, but it can definately be improved on and as with the daggerboard: the dimensions are just pulled out of my head for the time being. I dont think its too far away from the current norm but id need to sit down for a bit longer to work out what id really want.

(http://s7.postimage.org/fcroyk5yf/rosstfoil1.jpg) (http://postimage.org/image/fcroyk5yf/)

Your welcome to the 3d files for either of these - just let me know the format.

If you had something else in mind just let me know and il make some updates. It makes a nice break from the usual fair here!

Title: Re: 3D models of t-foils and dagger boards.
Post by: john_hamilton on March 09, 2012, 09:19:52 AM

i reckon the joint looks a bit small on that t foil

Title: Re: 3D models of t-foils and dagger boards.
Post by: ross_burkin on March 13, 2012, 05:13:49 PM

Thanks Ben, I'll be in touch.