Guest Andys@coffs Posted September 19, 2013 Posted September 19, 2013 If you look at the photos, especially the one showing 45 front on you can see that the wing connection points for the LH wing ( pilots perspective) have broken and there is a rope tied from prop to strut holding it in place. There is some serious work to be done! Major, your point about hidden damage is interesting but ive never heard of any subsequent structual failure occuring.....not to say your wrong, just that i would have expected to have heard of failures if it was widespread. I have heard that carbon fibre based composites do have this issue and in the event of a crash im not at all sure what the way forward is in terms of return to service. I was told that the extra $$ involved for some of the higher cost carbon fibre based UL's may well be the worst way you can spend some excess $$ but i have nothing from a fact persective on which to base that, but should i win lotto and get a hankering for a fast toy i might well check that aspect out in advance Andy
turboplanner Posted September 19, 2013 Posted September 19, 2013 FRP has a memory and can deform very substantially and spring back, but to deform, glass strands have to snap, sometimes by the tens of thousands. As Major says, the part springs back and looks OK, but those thousands of glass strands snap or become delaminated from the resin, so repair is usually a substantial half lap sand over all the potentially weakened area and a new laminate at least at the weight of the old, sometimes heavier.
fly_tornado Posted September 19, 2013 Posted September 19, 2013 Good luck buying a used Jabiru that has been flipped. At least with alloy you can see some of the damage in the skin. 1
facthunter Posted September 19, 2013 Posted September 19, 2013 Alloy and steel tube repair well. Just replace any deformed part. Experience would play a big part in repairing Jabiru's. Knowing where to look for stress damage. It's a pretty low tech method of constructing a plane, but they get away with it. Carbon Fibre composite laminates has the edge on performance on everything pretty much but WHO is qualified to build or repair? How long has it taken Boeing's Dreamliner to get into the air? Nev
Guest Maj Millard Posted September 20, 2013 Posted September 20, 2013 Alloy and steel tube repair well. Just replace any deformed part. Experience would play a big part in repairing Jabiru's. Knowing where to look for stress damage. It's a pretty low tech method of constructing a plane, but they get away with it.Carbon Fibre composite laminates has the edge on performance on everything pretty much but WHO is qualified to build or repair? How long has it taken Boeing's Dreamliner to get into the air? Nev Well I for one am qualified to repair "advanced Composite Structures". (Carbon fibre, Kevlar , and other advance matrixs) etc........ I studied for and Recieved an FAA Level 2 Advanced composite certificate. HOWEVER, would I want to work on repairing Carbon Fiber structures ???.........not a chance, .......small liberated CF airborne slithers are as dangerous to humans as Asbestos. It also has the ability to be absorbed through the skin and potentially end up in your heart, and other organs. I was once offered a very high-paying job doing just that....and passed on it in respect for my health. To work safely with it requires full sealed suits with taped gloves and positive -pressure breathing apparatus, .....not a fun daily work envioriment !...... Exotic Glass -Fiber construction has its advantages, but also some major negatives........I know of two such aircraft (Seamax and a Pipistrel) that were damaged recently, and both had to be sent back to the overseas factory for repair, that gets expensive very quickly.......Maj...
viewfromright Posted September 20, 2013 Author Posted September 20, 2013 Just received an email regarding this incident that rang some alarm bells - "Departed Lismore downwind. Landed 06 Ballina, downwind and against existing traffic, ended up 1.8km from 06 threshold having taken out a 24 approach aid. Ballina wind. 18/09.30am EST, Westerly 11 gusting 17, 18/10.00am EST, WNW 13 gusting 19. (Source BOM). That equates to a tailwind of 12 knots and a cross wind of 15 kts. Ballina by the way is a Jet Airliner airport, big enough to accept 737's which, unlike this bloke in an ultralight, manage to stay on the runway. This is why your insurance is going up and why CASA are looking so hard at this end of the industry." 1
M61A1 Posted September 20, 2013 Posted September 20, 2013 Well I for one am qualified to repair "advanced Composite Structures". (Carbon fibre, Kevlar , and other advance matrixs) etc........ I studied for and Recieved an FAA Level 2 Advanced composite certificate.HOWEVER, would I want to work on repairing Carbon Fiber structures ???.........not a chance, .......small liberated CF airborne slithers are as dangerous to humans as Asbestos. It also has the ability to be absorbed through the skin and potentially end up in your heart, and other organs. I was once offered a very high-paying job doing just that....and passed on it in respect for my health. To work safely with it requires full sealed suits with taped gloves and positive -pressure breathing apparatus, .....not a fun daily work envioriment !...... Exotic Glass -Fiber construction has its advantages, but also some major negatives........I know of two such aircraft (Seamax and a Pipistrel) that were damaged recently, and both had to be sent back to the overseas factory for repair, that gets expensive very quickly.......Maj... Yep, it's a handy skill, but I would hate do it for a living. You needs good bit of space as well, a dirty area, a clean area and preferably a hot bonding controller with vacuum.
turboplanner Posted September 20, 2013 Posted September 20, 2013 Just received an email regarding this incident that rang some alarm bells -"Departed Lismore downwind. Landed 06 Ballina, downwind and against existing traffic, ended up 1.8km from 06 threshold having taken out a 24 approach aid. Ballina wind. 18/09.30am EST, Westerly 11 gusting 17, 18/10.00am EST, WNW 13 gusting 19. (Source BOM). That equates to a tailwind of 12 knots and a cross wind of 15 kts. Ballina by the way is a Jet Airliner airport, big enough to accept 737's which, unlike this bloke in an ultralight, manage to stay on the runway. This is why your insurance is going up and why CASA are looking so hard at this end of the industry."
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