Also my opinion on the subject - it is interesting to see so many numbers, but I believe they make sense. Sorry but I don't understand Spanish, but I wrote in English.
It takes into account how the masts are produced.
All the masts are produced, it doesn't matter if this is filament winding or prepreg technology, by winding or "wrapping" steel conically shaped tube by filament or prepreg tape. So this means that inner diameter should be more or less identical with all the producers.
Difference on the outer diameter arises mainly from three factors (example on prepreg technology) - but I believe reason 2 and three have the biggest influence:
1. carbon content - as you all now masts are two component system of epoxy resin and armature (this differentiates on carbon content). 100 % means all armature is just carbon, and for example 65% means , that armature is combined of 65 % of carbon and 35 % of glass fiber. As it is glass fiber of higher density compared to carbon, the thickness would be lower.
2. technology of production - you have to ask yourself, what was technology used - wa filament winding or prepreg. And to go even further what process was used when curing prepreg masts. In this case you have producers that use autoclave for curing besides vacuum.
This means that high pressure presses more on carbon layer onto the steel tube and squizzing out even more epoxy resin. This way are prepreg masts lighter and consequently thinner. And higher quality because air bubbles are pressed out also.
3. quality of material - because of the race to reduce the costs of material a lot of producers, trademarks and/or sellers turn to production in China or to materials from China. As it carbon fiber production chemical process, the resulting carbon material can differ in quality - mainly in physical properties. Purity of carbon fiber and density of carbon fiber can be the two that would define the end thickness of mast wall and consequently outside diameter.
You guys stated quite a number of different masts, what I miss with this, that maybe interesting would be to add the weight of these measured masts and then compare.
With best regards,
Uroš
mastsonline.com team
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