BayAreaKite is spot on
Peter
But then those aluminium masts must be wider, which has its own drawbacks...windmaker wrote: ↑Mon Feb 22, 2021 6:43 amI think it is fair to say that there is a significant difference between carbon masts, not so much between aluminum masts. Depending on layup and quality of materials used there can be a 10x fold difference in stiffness and strength between 2 different carbon masts. Some aluminum masts are even stiffer and close to the same weight than some carbons...
For sure, but disregarding the price, what is best. Basic shape stiff aluminum or tapered, thinner but flexier carbon.PrfctChaos wrote: ↑Mon Feb 22, 2021 7:23 amBut then those aluminium masts must be wider, which has its own drawbacks...windmaker wrote: ↑Mon Feb 22, 2021 6:43 amI think it is fair to say that there is a significant difference between carbon masts, not so much between aluminum masts. Depending on layup and quality of materials used there can be a 10x fold difference in stiffness and strength between 2 different carbon masts. Some aluminum masts are even stiffer and close to the same weight than some carbons...
That is why racing carbon masts are often nice and thin, but quite heavy, because of all the carbon used to get the thinner section strong and stiff.
Are you sure about these numbers? To clarify, what are we comparing here, strength per weight, or strength per volume? For stiffness and strength of material at the same element wall thickness CF is 90.5/69 = 1.31 that is about 30% stiffer. Then, you can't have carbon laminate schedule in the same direction, so that you will have to have 90 degree together with 45, whereas alum is uniform, so that this 30% advantage would quickly disappear.BayAreaKite wrote: ↑Mon Feb 22, 2021 5:16 amI am sorry @SMJ, but that is a gross generalization and shows a general misunderstanding of material properties. Standard modulus carbon fiber is at minimum 5x the strength of aluminum (1400MPa vs. 300MPa). It is also 18x stiffer than aluminum (125GPa vs. 6.8GPa)...
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