# Source for Carbon Rods?

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#### bmcj

##### Well-Known Member
HBA Supporter
I'm checking out some Chinese suppliers right now for 2mm x 5mm strip.
Are those converted from spent nuclear reactor rods???

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#### peter hudson

##### Well-Known Member
!!!!!!!??????

Do tell.
This is for an ultralight sailplane design I'm working on.

Well for now I expect maybe 4 degrees of dihedral and maybe 2 degrees of forward sweep and a little more forward sweep in the spar further out at a change in taper.

I thought I could maybe angle each spar cap's pultrusions to make the dihedral AND sweep all one bend at the root then maybe twist them slowly to be the right orientation for the bend further out. But round stock would have made it a no-brainer.

#### peter hudson

##### Well-Known Member
I'd consider it for a huge order, but for now I only stock the 5mm x 2mm size. Unless your spars need to be curved a lot in both directions, you can probably make those work.

Edit add: Paypal me \$5 to cover handling and postage, and I'll send you a 12" sample to try out.
I think I'll just buy a 410 foot spool to play with since I'll have to make and break a few sub components before feeling comfortable. What's the best way to place that order?

#### PMD

##### Well-Known Member
This is for an ultralight sailplane design I'm working on.

Well for now I expect maybe 4 degrees of dihedral and maybe 2 degrees of forward sweep and a little more forward sweep in the spar further out at a change in taper.
OK, thanks for the (very interesting) explanation. I had assumed you were referring to dynamic bending in plane, not layout/layup - thus of course round makes perfect sense.

Now come the questions: is the forward sweep for aerodynamic reasons or CofG? With bent in horizontal plane layout at roots, it sounds like a one piece wing? Expected a sailplane to have removeable x 2 for recovery from off-airport landings.