Single-seat ultralight puddlejumper: the "Carbonmax"

[Victor Bravo]

Thanks karma, glad to know my memory is still usable!

BTW, if you ever get to meet Dave Lednicer, he'll be the smartest guy in the room, even if you're meeting over at Bill Gates' house having lunch with Elon Musk.

Dave is an absolute great guy as well.

 

[davidjgall]

BTW, if you ever get to meet Dave Lednicer, he'll be the smartest guy in the room, even if you're meeting over at Bill Gates' house having lunch with Elon Musk.

Dave is an absolute great guy as well.

Maybe you could get him to fix Drela’s implementation of NACA airfoil geometry in Xfoil...?

 

[Victor Bravo]

I'm not technically qualified to have a cup of coffee with either of those guys, much less to ask one of them to fix an oversight by the other

 

[BJC]

This evening we installed the orthogonal stiffeners.
View attachment 95430

Bob:

Is there enough air trapped under the stiffeners to require vent holes?


BJC

 

[BoKu]

Bob:

Is there enough air trapped under the stiffeners to require vent holes?


BJC

I don't think there's anything there to worry about.

 

[stanislavz]

Kind of other thinking out of the box for non-foam leading edge. Motiwation from video - it is sturdier, than 200gsm foam 200gsm. :

 

[BoKu]

Kind of other thinking out of the box for non-foam leading edge...

Just so. Sonja lives just up the highway from me.

 

[stanislavz]

Sonja lives just up the highway from me.

I will cry.

 

[Victor Bravo]

Some really clever person in the homebuilt glider business (ahem...) should probably speak with her about making molds off of that motorglider and creating a kit version.

I'm sure there are several improvements and tweaks that can be made (based on her experience with the prototype), but overall it seems that this is a perfectly workable example of a modern AS-K14.

 

[BoKu]

Some really clever person in the homebuilt glider business (ahem...) should probably speak with her about making molds off of that motorglider and creating a kit version...

You should really look at the aircraft itself. I admire Sonja's incredible innovation and resourcefulness, but her work has a certain organic nature to it. Which is perfectly fine in a one-off, and I don't think she ever intended it to be more than that. It works perfectly well and the air doesn't care about straight lines. But it would be kind of a tough sell in a production unit.

 

[Jay Kempf]

Yeah but for production you would have to build tools anyway. So you would take some license and so it could be lofted a bit more... aggressively towards smoothness then.

The overall concept is great and the performance speaks for itself. Met Sonja at Oshkosh some years back. Have some colleagues in common with her. Nothing but praise all around as to her engineering prowess.

 

[dana62448]

Have we had any progress with the very promising Carbon Max?

 

[BoKu]

It's on the back burner right now while I finish a bunch of other stuff. But it's definitely not abandoned!

 

[dana62448]

There was a thread recently regarding moldiness D-tubes.
It mentioned Rol Klingberg and misrepresented his work.
Rol has spent several years and successfully designed a method for flawless male mold D-tubes.
He deserves a shout out and credit for his perseverance.
I was appreciative enough to become a Patreon donor to his project.
I'm sure he saved me a year and several pounds.
He has multiple YouTube videos, but this one summarizes his technique.
I have begun my ultralight wing using this D-tube technique.
Thank you Rol:

Phil Dorothy

 

[stanislavz]

There was a thread recently regarding moldiness D-tubes.
It mentioned Rol Klingberg and misrepresented his work.
Rol has spent several years and successfully designed a method for flawless male mold D-tubes.
He deserves a shout out and credit for his perseverance.
I was appreciative enough to become a Patreon donor to his project.
I'm sure he saved me a year and several pounds.
He has multiple YouTube videos, but this one summarizes his technique.
I have begun my ultralight wing using this D-tube technique.

It is same idea, as proposed by Strojnik earlier. Big minus here is - it is ok only for single ply, no overlap.

 

[davidjgall]

Sure is quiet lately....

 

[daveklingler]

It is same idea, as proposed by Strojnik earlier. Big minus here is - it is ok only for single ply, no overlap.

Not sure what you mean about "no overlap", but he cites smooth overlaps as an advantage of the technique.

I don't see any reason offhand why you couldn't use a similar technique with infusion for multiple plies.