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Recent content by gyro

  1. gyro

    Heating acrylic sheet.

    Hi Just Asking, That is a different idea! How do you handle it with that hot oil on it? What sort of oil is used, vegetable or mineral? Gyro.
  2. gyro

    Method of heating acrylic sheet.

    Can anyone advise the most efficient method of heating acrylic sheet for forming windscreens? I have heard that electric, bar type heaters of the room heater type are used but isn't there something like the frequency of the radiation to be considered? If the radiation was the right frequency...
  3. gyro

    Heating acrylic sheet.

    Can anyone advise the most efficient method of heating acrylic sheet for forming windscreens? I have heard that electric, bar type heaters of the room heater type are used but isn't there something like the frequency of the radiation to be considered? If the radiation was the right frequency...
  4. gyro

    Bonding of Fibreglass to Perspex

    Wairau, I assume that your "perspex" is acrylic. We once made a mould out of acrylic sheet and attempted to cast small objects in a polyester resin and q-cells mix. The result was that we simply could not remove the castings from the acrylic! The acrylic had been well waxed with mould...
  5. gyro

    Fasteners for composite panels.

    Thanks fellas, As this is the prototype we are using the "tryit and see" approach to some of the design. If, after testing, the fasteners are ok - good, we will take steps to incorporate as necessary, into the moulds. Some things like this can be tricky and something new might need to...
  6. gyro

    Fasteners for composite panels.

    Hello Kasper, Well yes, something countersunk might be OK but how do you countersink into such a thin material? The laminate is only about a millimetre thick. I have considered cutting a piece out of the surface to be fixed to and making a recess in it by glueing another piece behind it. Then...
  7. gyro

    Hydraulic cylinder seal friction.

    Thanks Eddanzer and Metalguy, Reading your expert advice causes me to think that this is getting into the "Too complicated" category. However I now am much more knowledgable and may do a little more testing which may produce something. Grateful regards, Gyro.
  8. gyro

    Adhesive for polycarbonate sheet. "Lexan"

    Does anyone know what is the best adhesive for glueing bracing bits to polycarbonate canopies and windscreens? I have been told that silicone causes micro cracks, what else is there that wont let go? I hope there is an expert out there! Cheers, Gyro.
  9. gyro

    Hydraulic cylinder seal friction.

    I have been away for a while, thanks for the opinions. The pistons were all stainless steel. I have since tested a master cylinder off a motor vehicle that is also half inch dia bore and find that it also has the same drag when used in the same application. In normal brakes the seal does not...
  10. gyro

    Adhesive for polycarbonate sheet.

    I need to stick edge supports to polycarbonate sheet, as in a windscreen. Can anyone tell me what sort of adhesive will stick to it and keep on sticking? Thanks for any advice, Gyro.
  11. gyro

    Joint failure by bolt bearing

    Thanks for the info, perhaps you will understand better if I say that I wondered that if the, in a pin or truss type joint, the material which bears on the surface of the pin the is harder than the pin in it will cause the pin to fail by deforming the surface. The shear stress of the bolt is...
  12. gyro

    Fasteners for composite panels.

    I have to find suitable fasteners to hold the engine covers on a new, rear-engined, composite aircraft. The two mating surfaces are two layers of 300gram bi-directional glass thick. It would be preferable to have the fasteners flush with the surface if possible, but a small bump could be ok. Has...
  13. gyro

    helicopter rotor blades

    There is several manufactures of composites gyrocopter rotorblades around. If you look at the regional websites for the associations (Popular rotorcraft association and Australian Sport Rotorcraft association, etc)you might be able to contact some of these people. One lot of rotorblades from...
  14. gyro

    Joint failure by bolt bearing

    I am currently working on a strut connection where the strut end is a block of aluminium (quite thick)and on each side of this is 4130 steel plates that connect to the fuselage. What I wanted help with is when doing the bolting bearing stress calculations on the hole. I found that the ultimate...
  15. gyro

    Hydraulic rudder operation.

    I have constructed some small cylinders to actuate the rudder on an ultralight aircraft. They are 19mm and 12mm (3/4" and 1/2") bore diameters. Two cylinders are at the pedals and two back at the rudder. When in operation, all four pistons are moving at once as the opposite side...
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