Selden Alto Mast Bend Characteristics?

[Tim Steele]

Hi everyone,

Does anyone have any detailed information or data on the bend characteristics of the Selden Alto mast? 

Any help would be greatly appreciated, thanks in advance!

Tim Steele

[Craig Thompson]

See attached.

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Craig Thompson

+1 603 918 1771 (mobile) 
iqc...@gmail.com

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[Nathan de Vries]

There’s also fore/aft/side bend comparisons between Selden & SuperSpars sections included in the chart on this page:

https://usa505.org/library/rigging-and-project-archive/selden-alto-mast-rigging/

Relatedly, I enjoyed Mozzy’s latest video on the relationship between mast stiffness, leech tension and luff curve:

 

https://youtu.be/Q-RMLI2wTXQ?si=35krGBIIbqOTSvSi

Nathan

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[Michael Renda]

https://usa505.org/library/rigging-and-project-archive/selden-alto-mast-rigging/

has a table with data from the common sections

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[Eric Anderson]

Craig and I deflected 12 of them in 2023. Less variance than the M2 but still some variance. It correlates pretty directly with tube weight ie heavier is stiffer.

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[Tim Steele]

Thanks everyone, really appreciate the help! 

Interesting that each mast has some variation, so it sounds like we have to measure our own masts to get more accurate numbers. 

Thanks,

Tim

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