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#1
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![]() "John Galloway" wrote in message ... The thing that caught my eye is this sentence: "Our newly-developed wing structure allows for a wing span of 21m despite of a wing section as thin as 13%." Anyone got any information about what is new about the wing structure? Anything that might make the surfaces have a low susceptibility to shrinkage and deformity? John Galloway John, My ASH26E is six years old with no sign of wing deformity (spar showing etc). I understand this was a problem for Schleicher at one point, and some ordering new ships were insisting that wings be cured twice etc. I sometimes fly winter wave and have no gel coat cracks to show for it at all. My glider is most always left assembled and hangared. bumper zz Minden |
#2
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On Dec 20, 9:47*am, "bumper" wrote:
I understand this was a problem for Schleicher at one point, and some ordering new ships were insisting that wings be cured twice etc. What curing is done at Schleicher? I did not think they had or used an autoclave. I think my 28 was cured in Arizona. Andy |
#3
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Bumper,
How often do you fly with water ballast? I have seen several Schleicher wings in Arizona and New Mexico that had visible wing spar bumps (when viewed from the right angle), gliders less than 5 years young. The flight and maintenance manuals for my ASG29 are emphatic about completely emptying the wings after flights with water ballast. They even added additional drain plugs at the wing root rib leading edge, to ensure complete drainage when trailered, and the manuals go so far as to suggest removing the wing root gaskets when ballast will not be used for a while. So, the factory seems to be firmly convinced that residual moisture is the shrinkage culprit. I am going to take their word for it, and keep those wings ventilated on the ground. 2NO |
#4
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On Dec 22, 7:06*am, Tuno wrote:
Bumper, How often do you fly with water ballast? I have seen several Schleicher wings in Arizona and New Mexico that had visible wing spar bumps (when viewed from the right angle), gliders less than 5 years young. The flight and maintenance manuals for my ASG29 are emphatic about completely emptying the wings after flights with water ballast. They even added additional drain plugs at the wing root rib leading edge, to ensure complete drainage when trailered, and the manuals go so far as to suggest removing the wing root gaskets when ballast will not be used for a while. So, the factory seems to be firmly convinced that residual moisture is the shrinkage culprit. I am going to take their word for it, and keep those wings ventilated on the ground. 2NO Ted As already mentioned, the ASH-26E has water bags not wing tanks. And because of wing loading, some ASH-26E do not see much water, especially if they have the optional wing fuel bags. Whether Bumper's 26E has water bags and they are used much, he will need to answer. Darryl |
#5
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On Dec 22, 8:06*am, Tuno wrote:
So, the factory seems to be firmly convinced that residual moisture is the shrinkage culprit. Either that, or a very convenient way to blame the customer for the problem. Personally I don't buy it. The humidity inside a wing in some US states and many European countries is probably far higher for a sailplane that has never been loaded with ballast than for one in Arizona that has been loaded, dumped, and stored with the fill caps off. I got water inside the wings of my 28 when I landed out and got dumped on by a torrential thunderstorm. The winds were high enough I secured the airbrakes full open. Water filled the airbrake boxes and then made its way into the wing. I tried very hard to drain in out, I tried to vacuum it out with long tubes, but nothing worked. I could still hear it sloshing around in there. I called the US agent thinking the next step would be to drill holes in the wings, and he said don't worry about it. I had pulled off the aileron push rod seals to vent the wing aft of the spar and left them off for a few days. After cooking in the trailer in the Arizona sun for a week or less there was no more sloshing. All the water had gone. Andy |
#6
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![]() "Tuno" wrote in message ... Bumper, How often do you fly with water ballast? As Darryl says, many 26E's don't have water, especially if they have fuel bladders in the wings, as mine does. To get heavy, I add fuel. To minimize my carbon footprint, I've installed igniters for when I need to dump ballast. bumper zz Minden |
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