Sherman7057, on 22 December 2011 - 08:39 AM, said:
I'm a shooter not an engineer. I have one question.Why can't limbs be made from aluminum? There has to be an aluminum that would flex just as well as glass.Kevlar...carbon...steel even.
Aluminum can indeed flex, bend, and store potential energy. The problem with aluminum is, it has a crystalline structure that is prone to fatigue and stress that causes cracks from the oscillations of the string. Aircraft must be constantly inspected for these cracks caused by the slightest flexing and sympathetic vibration. I've had the leaf springs on my boat trailer break enough to know that I don't want steel either.
I started shooting crossbows in 1968, my first crossbow [still have one] was a Wham-O Powermaster with an aluminum prod. The reason you don't see crossbows made by Wham-O is because
they were sued out of existence over personal injuries suffered over their failing aluminum prods. Not likely Barnett et al is eager to follow.
You folks who make your purchasing decisions based on reviews can sometimes let yourselves in for trouble. I have seen rave reviews on the worst crossbows on the market, with few follow-up reviews to warn of problems later. Better to ask someone who has had one for a while because everyone is thrilled with their new weapon at first; problems are usually only revealed after the owner has had it a while.
Reviews are made while still in the honeymoon stage of ownership before the new owner comes out of the ether, and are notoriously inaccurate IMO. Even at that, sometimes you might not get the full story as someone who bought a crossbow might be reluctant to reveal a problem to a prospective buyer of the same make/model because it would be seen like an admission of making a bad decision. Reviews are really only helpful when problems surface right away and are reported. Doesn't happen much, so a lot of problems are "reviewed" over and missed until after the purchase.
Jack ><>
Edited by Jack Pine, 26 December 2011 - 07:34 AM.