Is the boom contraction when under stress (because of deformed tubes) worth talking about?


When using a somewhat too big sail - or in a gust - you can almost feel the boom tubes bending. And when the tubes bend, it shall of course result in a wider and shorter boom. Is this boom contraction effect worth talking about - or is it negligible?


Here's a test from the early days of big formula sails and big booms. The two booms are measured fully extended and extended to a length, that match sail sizes around 10.7 - 11.0 kvm.


Better than a lot of words the naive drawing below explains how the test was carried out.


You can of course make your own conclusion, but I think  it may be concluded, that this boom contraction thing is negligible - especially when considering that the newer generations of long carbon booms have grown considerable stiffer.