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Earlier, "Bert Willing"
wrote: In any case you will have a blind bonding applied to one side, be is spar web to spar cap, or spar cap to wing skin - that's the backdraw of using negative moulds. Now if you produce voids in one case, you might as well produce voids in the other case, no?... Well, no, I don't see it that way. The loads between the skin and the spar are far lower than the loads between the shear webs and the spar caps. Also, the stiffening of the spar caps against buckling is absolutely critical to the itegrity of the spar. Voids between the shear web and the spar cap leave the cap much more vulnerable to buckling. Bob K. And, by the way, how much would you allow the price of a glider to increase in case the the manufacturer goes for x-ray or ultrasonic QC? -- Bert Willing ASW20 "TW" "Slingsby" a écrit dans le message de om... Still, the use of Graphlite rods instead of carbon fibre rovings, and externally built spars which are then wrapped in fibreglass cloth and vacuum-bagged is a method which produces stronger, more durable and longer lasting wings. As the current fleet of German gliders gets older I'll wager there will be a lot of speed limiting directives because the "margin of error" isn't what they thought it would be. What kind of spar construction methods do the SparrowHawk, Apis and Russia gliders use? |
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