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We've had some inquiries on the strength of Attack Tubes. Here's a table of the test results provided by a third party lab.
C# =Ultimate Ther. Column load
66" Long downtube, loaded on axis
F# = Lateral Load in LBS.
Applied at center of 66" long
Downtube, 30,000psi, 6063-T6 Alum.
| Sample | C# | F# |
| Attack Tube | 992.# | 154.# |
| Sample 1 | 861.# | 134.# |
| Sample 2 | 779.# | 100.# |
| Sample 3 | 965.# | 117.# |
Sample 1 is the original equipment found on a very popular US manfacturer's Hang Glider.
Sample 2 is a popular replacement downtube with rubber trailing edge.
Sample 3 is the same as Sample 2 with a full length inner sleeve.