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#11
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I bought a G-103 that had been in a hangar fire in Georgia, Peach State Club. We needed a left wing and the photos showed what looked like a useable left wing on a fuselage with canopies that had been hot enough to melt the canopies. Both canopied draped down like a tarp, but it was the new shape of the plexiglass! The outer skin of the left wing top was blistered and had to be replaced, but the spar caps were undamaged. I figured the wing hadn’t been in 350 degree environment long enough to affect the more dense spar cap. We proof-loaded the wing and it took 5.3 G’s with flying colors! That was some 25 years ago and that ship is still flying today!
Just a little data point about how much heat a fiberglass structure can take, JJ |
#12
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On Friday, April 19, 2019 at 7:10:14 AM UTC-7, wrote:
I bought a G-103 that had been in a hangar fire in Georgia, Peach State Club. We needed a left wing and the photos showed what looked like a useable left wing on a fuselage with canopies that had been hot enough to melt the canopies. Both canopied draped down like a tarp, but it was the new shape of the plexiglass! The outer skin of the left wing top was blistered and had to be replaced, but the spar caps were undamaged. I figured the wing hadn’t been in 350 degree environment long enough to affect the more dense spar cap. We proof-loaded the wing and it took 5.3 G’s with flying colors! That was some 25 years ago and that ship is still flying today! Just a little data point about how much heat a fiberglass structure can take, JJ I remember seeing those Peach State gliders tied down at Williamson after the fire. Have also flown an ASH25Mi that was previously an ASH25M and involved in an engine compartment fire. The factory replaced the fuselage, worked on the wings, got it flying as good as ever. Jim |
#14
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I was hoping JJ would post up about his fire damage repairs.
Right now at the HP shop we're doing a skunky project involving high-temperature epoxy systems. As part of it, we did some test on more pedestrian epoxies of the sort typically used in gliders. They appear to demonstrate that you can get them well above Tg and they'll still recover full strength when they cool down. Of course, how far above Tg you can safely get is hard to quantify. ...They are shocked that it has not been destroyed... A corporate entity based in a former Soviet republic is surprised that airworthiness authorities did not seize and destroy the personal property of a private citizen? Shocked, I tell you, Shocked! (Bogie never did say "Play it again, Sam.") --Bob K. |
#15
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I asked my good friend, Stan Hall about flying this “heat treated” Grob wing and he gave me his honest opinion...........Only way to know for sure is to proof load it! Stan helped me on several projects including strength analysis of my scratch built Super Bowles Albatross.I sent him a full scale drawing of my center-wing attachments and he replied, “it’s strong enough, just strong enough”! I put 50 hours on the ship and then donated it to The SW Soaring Museum.
RIP old friend, JJ |
#16
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If you need more proof such a company doesn't understand the ways of their ideal buyer...they have airplanes named "Sinus" and "Virus." Think they're taking pre orders for the anus yet? How does one even market something called a virus?
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#17
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On Friday, April 19, 2019 at 6:59:15 PM UTC+2, Bob Kuykendall wrote:
I was hoping JJ would post up about his fire damage repairs. Right now at the HP shop we're doing a skunky project involving high-temperature epoxy systems. As part of it, we did some test on more pedestrian epoxies of the sort typically used in gliders. They appear to demonstrate that you can get them well above Tg and they'll still recover full strength when they cool down. Of course, how far above Tg you can safely get is hard to quantify. ...They are shocked that it has not been destroyed... A corporate entity based in a former Soviet republic is surprised that airworthiness authorities did not seize and destroy the personal property of a private citizen? Shocked, I tell you, Shocked! (Bogie never did say "Play it again, Sam.") --Bob K. Slovenia has never been a Soviet Republic. Check your history. |
#18
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At 05:39 20 April 2019, Echo wrote:
If you need more proof such a company doesn't understand the ways of their ideal buyer...they have airplanes named "Sinus" and "Virus." Think they're taking pre orders for the anus yet? How does one even market something called a virus? They seem to pretty successful- I think probably one of the most successful and innovative in their field - I guess they are not as ignorant as yourself. |
#19
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Perhaps you haven't flown it.
I guess for some people it's an ideal platform to dabble in two sides of aviation. I wasn't a fan personally. I didn't say they didn't sell any; simply that I think I would have marketed it differently. |
#20
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On Friday, April 19, 2019 at 7:10:14 AM UTC-7, wrote:
I bought a G-103 that had been in a hangar fire in Georgia, Peach State Club. We needed a left wing and the photos showed what looked like a useable left wing on a fuselage with canopies that had been hot enough to melt the canopies. Both canopied draped down like a tarp, but it was the new shape of the plexiglass! The outer skin of the left wing top was blistered and had to be replaced, but the spar caps were undamaged. I figured the wing hadn’t been in 350 degree environment long enough to affect the more dense spar cap. We proof-loaded the wing and it took 5.3 G’s with flying colors! That was some 25 years ago and that ship is still flying today! Just a little data point about how much heat a fiberglass structure can take, JJ There is a reason why fiberglass gliders are painted white: they can't withstand high temperatures. There is a critical temperature called the "glass transition temperature" which is where the plastic starts transitioning from a solid into a liquid. A typical glass transition temp for fiberglass is 100C, well below the temps seen in that hanger fire. The fact that they canopy melted demonstrates that the temp was that high for some period of time.. https://en.wikipedia.org/wiki/Glass_transition |
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