Im looking to install some cooling vents in a plane and need a piece of carbon tube.  Ideal Diameter would be something 1/2"-5/8" or so and relatively thin wall.  (I know Im demanding arnt I!)  Thing is I only need a few inches of it.(This is just waiting for a rude reply)

Anyone know what the tailboom diameter of Helis are? 

I will start bidding at a six pack of beer!

450 booms are 12mm/.472" diameter.
Can't help you with a carbon one though - all mine are aluminum.

I have some 12mm, thick wall, what did you need 3-4".

Thanks guys but I think I'm going to buy 450 carbon heli boom and keep it around.  I looked to see the spec size and realized they are only like $15 !  12mm od 11mm id.  The 500 tail boom is 16mm od and 14mm id.  im still on the fence on what size to buy.

16mm od and 15mm id  carbon tube for 500 heli ordered.

$22 and the Zoom Room will have it in a week!  What will I do with the spare 400mm of it lol