ORIGINAL: geezeraviation
I use tubing a lot Paul. I have it for the axles on a 1/4 N28 (2piece swing axles) It weighs about 14 lb or so and they hold up well. I have 3/8'' on the 1/3 scale N28 (38 1/2 lb dry) and so far so good. The id will accept 1/4 od tube or rod if there's a problem. I used it on a 1/4 SE 5a as a one piece axle and bent it on a bad landing, the Se is sort of portly at 23 1/2 lb and I wasnt too surprised when it bent, it was a crappy landing, no really it was.
Doc
What is the tube made of? Whats the alloy? Wall thickness? Is the main drawback is once it is bent your day is finished? I seen Jeff Shutic bending his solid wire axle.... over and over like "taffy" and continue fly the rest of the day............probably the rest of the year..... knowing Jeff LOL
HPA