3.25- to 3.43-inch airframe tube?

[SolarYellow]

Is there any good airframe tube out there in the range from 3.25 to 3.43 inches OD? Looking for typical HPR cardboard thickness/weight. The only thing I've found between 3.1 and 4 inches is the Composite Warehouse 3.5-inch fiberglass. And besides being heavy and expensive, that's CW.

 

[David_Stack]

Is there any good airframe tube out there in the range from 3.25 to 3.43 inches OD? Looking for typical HPR cardboard thickness/weight. The only thing I've found between 3.1 and 4 inches is the Composite Warehouse 3.5-inch fiberglass. And besides being heavy and expensive, that's CW.

Perhaps more than you wish to spend (and you mentioned "HPR cardboard" in your post), but Dragon Plate offers both carbon fiber and composite kevlar core carbon fiber tubes in diameters of 3.25 and 3.375".

https://dragonplate.com/braided-standard-carbon-fiber-round-tubes#/orderby=5&pagenumber=5
https://dragonplate.com/kevlar-core-carbon-fiber-tubes#/orderby=5&pagenumber=6
There are also businesses out there that will custom roll paper tubes, but I suspect the price for a run of 1 or 2 is not going to be cost-effective.

I did a search for 8.5 cm shipping tubes, and came up empty on the metric front...

 

[SolarYellow]

Yeah, those prices make wrapping my own 0.045-wall on 3.25-inch aluminum tubing an interesting project.