i plan to build rotorblades by machineing a main spar and have a ribbed tail section.how to twist? my original plan was to twist the billets befor machineing and let them return to there natral state. but i beleive this would be difficult to yeild reliable results. can they be made strait and then bent? would that comprimise the strength? many production blades almost all are twisted. how is this done? any thoughts sugesstions or knowlage would be awsome thanks
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