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Showing content with the highest reputation on 10/11/2018 in all areas

  1. 1 point
    I am new here so wanted to put up a post... I am an "old Guy" who flew helicopters in Vietnam... I have Commercial Helicopter...Single Engine Land...Sport Pilot Powered Parachute ratings I am in the early stages of putting together a build of a Just Aircraft SuperSTOL XL and am trying to figure out which engine I am going with... I think it is going to be an Aeromomentum but I am still working on the plan... Thanks for the great Forum Charles
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    Good, important to fix that and develop good habits.
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    When Harry Schneider was doing certification testing on a new glider, he had to demonstrate spin recovery at a c of g even further aft than the allowable limit. I remember he used a bag of sand with a cord to spill the sand out if the situation became dire. The sandbag was fixed to the rear fuselage. So I find it surprising that a certified aircraft , flown within allowable g of g , could have a dangerous spin.
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    Yep, email came out this morning. Homework done & accommodation's booked, now just hoping the weather's good to turn a 6hr drive into a 70 minute flight.
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    The better BRS are fully deployed in 3 seconds and are shot well clear of the plane to avoid tangles. Believe it or not they can be deployed down to 30 meters ( 100 feet ). I wouldn't recommend that. Having worn a pilot chute for many years I know it is very hard to exit a plane in an unusual attitude. John.
  8. 1 point
    dull your drill bits on concrete
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    Polycarbonate really Doesn't like any kind of reactive solvent anywhere near it. It is incredibly strong physically, compared to acrylics like Perspex, which is very brittle, but solvents and Fuel should be kept well away from it. I used to manufacture Illuminated sign faces using Poly in High Vandalism risk areas. . .it withstands a lot of punishment. . .But if you wipe it clean with a solvent, like paint thinners, it melts the surface. Not good for windows in aircrft. . .Nice and bendy though, even at 1 mm thickness, and still strong enough to thwart small birds. . . . What we REALLY need is that Star Trek 'Transparent Aloominum' stuff. . . .
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    The 2 most common clear plastic sheeting used use in aircraft windscreens are polycarbonate & acrylic. Polycarbonate is much stronger but has slightly poorer transparency and deteriorates over time by yellowing. Polycarbonate scratches more easily than acrylic and is hard to fix whereas acrylic scratches can quite easily be removed. Strength is hardly an issue so I'd go with Acrylic every time as I can easily polish out scratches. I only use acrylic cleaners and polish on my canopy or mild soap & water. Never use ammonia or glass cleaners on acrylic. There are a number of brands of Acrylic. Plexiglas, Acrylite and Perspex are just 3 of them
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