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#1
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Extra bracing
I have just started to assemble my wings on my all wood aircraft. There
is a box spar in the front and a 3/4" thick spar in the back. Although this will no dought hold together, it only calls for 1 diagnal brace on each wing. I glued temperary diagnal braces on the inside to hold while I start to cover. This has added an extreme amount of strength. Now that I've led to the big question. Since this will add only 1lbs to the airframe, does anyone think it would be a good idea to keep the extra bracing? Or make the frame too stiff? Lou |
#2
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"Lou" wrote in message
oups.com... I have just started to assemble my wings on my all wood aircraft. There is a box spar in the front and a 3/4" thick spar in the back. Although this will no dought hold together, it only calls for 1 diagnal brace on each wing. I glued temperary diagnal braces on the inside to hold while I start to cover. This has added an extreme amount of strength. Now that I've led to the big question. Since this will add only 1lbs to the airframe, does anyone think it would be a good idea to keep the extra bracing? Or make the frame too stiff? Lou Lou........... Are you building from commercial plans? May I ask which model of airframe this is? Be very careful in deciding on your own to make any changes whatsoever to the construction. Consult the designer if you feel something is in error. If he or she is not available, consult with an aircraft design engineer. Believe me, these "only one pound" items add up rapidly and may induce stresses that the design is not able to handle. Remember the builder's code and repeat after me: Follow the plans, add only lightness. Follow the plans, add only lightness. Follow the plans, add only lightness. Rich S. |
#3
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"Lou" wrote:
I have just started to assemble my wings on my all wood aircraft. There is a box spar in the front and a 3/4" thick spar in the back. Although this will no dought hold together, it only calls for 1 diagnal brace on each wing. I glued temperary diagnal braces on the inside to hold while I start to cover. This has added an extreme amount of strength. Now that I've led to the big question. Since this will add only 1lbs to the airframe, does anyone think it would be a good idea to keep the extra bracing? Or make the frame too stiff? Lou While the added stiffness may initially sound appealing, what you are doing is taking stresses that the designer planned to be absorbed in the flexing of the wing and transferring them all to the attachment between the wing and the fuse. Doesn't sound like a good idea. -- Alex -- Replace "nospam" with "mail" to reply by email. Checked infrequently. |
#4
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On 15 Apr 2005 12:05:14 -0700, "Lou" wrote:
I have just started to assemble my wings on my all wood aircraft. There is a box spar in the front and a 3/4" thick spar in the back. Although this will no dought hold together, it only calls for 1 diagnal brace on each wing. I glued temperary diagnal braces on the inside to hold while I start to cover. This has added an extreme amount of strength. Now that I've led to the big question. Since this will add only 1lbs to the airframe, does anyone think it would be a good idea to keep the extra bracing? Or make the frame too stiff? Lou I don't know what you are building and it would help in anwering your question. My Jungster II has one diagonal wooden brace in the middle of 3 fabric covered bays, however the wing is covered with plywood skins top and bottom from the 3rd rib to the tip which forms a very rigid box. No other diagonal bracing is necessary. Ed Sullivan |
#5
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"Lou" wrote:
I have just started to assemble my wings on my all wood aircraft. There is a box spar in the front and a 3/4" thick spar in the back. Although this will no dought hold together, it only calls for 1 diagnal brace on each wing. I glued temperary diagnal braces on the inside to hold while I start to cover. This has added an extreme amount of strength. Now that I've led to the big question. Since this will add only 1lbs to the airframe, does anyone think it would be a good idea to keep the extra bracing? Or make the frame too stiff? As others have pointed out, "be careful". Think of this extreme example... Say you have a 10' piece of 1" OD PVC pipe, and one end is anchored firmly, and a weight of plus and minus 10 pounds is applied to the other end a thousand times a day. Not hard to imagine what happens - lots o' flexing. Now take a 9.8' piece of steel 1" ID water pipe and slide it over the PVC pipe and apply the same loading. In short order you'll have a broken piece of PVC pipe at the anchored end. Mark "and you don't wanna break your PVC in flight" Hickey |
#6
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Well I have to say, these are points that I had considered, but it's
good to have other's opinions to verify. I'll remove the extra bracing once I start to cover. Lou |
#7
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Mark Hickey wrote:
"Lou" wrote: I have just started to assemble my wings on my all wood aircraft. There is a box spar in the front and a 3/4" thick spar in the back. Although this will no dought hold together, it only calls for 1 diagnal brace on each wing. I glued temperary diagnal braces on the inside to hold while I start to cover. This has added an extreme amount of strength. Now that I've led to the big question. Since this will add only 1lbs to the airframe, does anyone think it would be a good idea to keep the extra bracing? Or make the frame too stiff? As others have pointed out, "be careful". Think of this extreme example... Say you have a 10' piece of 1" OD PVC pipe, and one end is anchored firmly, and a weight of plus and minus 10 pounds is applied to the other end a thousand times a day. Not hard to imagine what happens - lots o' flexing. Now take a 9.8' piece of steel 1" ID water pipe and slide it over the PVC pipe and apply the same loading. In short order you'll have a broken piece of PVC pipe at the anchored end. Mark "and you don't wanna break your PVC in flight" Hickey exactly what stresses increase due to adding the outer sleeve of steel, assuming your 'steel' adds no weight or inertia to the problem,,,,,,, -- Mark Smith Tri-State Kite Sales 1121 N Locust St Mt Vernon, IN 47620 1-812-838-6351 http://www.trikite.com |
#8
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Mark Smith wrote:
exactly what stresses increase due to adding the outer sleeve of steel, assuming your 'steel' adds no weight or inertia to the problem,,,,,,, For starters all your flexing is now done on the end instead of gradually over the length of the pipe. IE willow verses oak! John |
#9
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UltraJohn wrote:
Mark Smith wrote: exactly what stresses increase due to adding the outer sleeve of steel, assuming your 'steel' adds no weight or inertia to the problem,,,,,,, For starters all your flexing is now done on the end instead of gradually over the length of the pipe. IE willow verses oak! John does the reduced flexing with the sleeve increase or reduce the stresses at the wing root ? -- Mark Smith Tri-State Kite Sales 1121 N Locust St Mt Vernon, IN 47620 1-812-838-6351 http://www.trikite.com |
#10
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Mark Smith wrote:
UltraJohn wrote: Mark Smith wrote: exactly what stresses increase due to adding the outer sleeve of steel, assuming your 'steel' adds no weight or inertia to the problem,,,,,,, For starters all your flexing is now done on the end instead of gradually over the length of the pipe. IE willow verses oak! John does the reduced flexing with the sleeve increase or reduce the stresses at the wing root ? It definitely increases the stress. Without the pipe the length of pvc absorbs energy along it's length with the pipe over it all the stress is reflected at the end. John Look at the wing of an airliner the next time you fly and you'd be amazed at how much it flexes. If they stiffened it to the point it didn't flex you'd end up on the ground do a pretty quick vertical decent. Not Good! |
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