Helpful Tips

Previous Tips:
  1. Spring time instrument leak check
    At least once a year it is a good practice to check all the instrument systems for leaks to avoid erroneous readings this can be done with a few simple tools One of the most important things for proper performance of a variometer is to ensure that there are no leaks in the system by this I mean the line to the total energy probe and the line to the capacity must not leak. The procedure to check these lines is fairly straight forward first you will need to locate a method to pressurize the lines with great control, do not use compressed air!, one or two large bore syringes work well, in addition you will need some tape or plugs to plug the total energy port in the tail and a "T" connector. The first step will be to label all the tubes at the instruments to get things back in the proper places when we are finished, second we will remove the total energy line and attach it to the air speed indicator this will be used as our pressure indicator now we will attach the "T" connector into the total energy line and plug the total energy probe port on the tail hook up the syringes to the "T" connector and pressurize the system while carefully watching the airspeed indicator there is no need to exceed a reading of 50-60 knots a perfectly sealed system would hold this reading indefinitely however this is not usually the case but it should take several minutes for the reading to drop to zero. This procedure can be used for other systems on the glider Use great care to avoid large pressure changes assure that the airspeed indicator reads zero before removing any of the lines Repeat this procedure with the capacity line using the "T" connector with the syringe between the capacity and the airspeed indicator .also check the airspeed and capacity lines. By process of elimination remove all the leaks checking the connections first then visually inspecting the lines themselves. I have seen lines that were chewed by mice causing very erratic variometer readings.

     


  2. Mounting by gluing nuts to back of case
    One method I have found helpful in installing sage variometers is to use super glue to stick the plastic nuts to the back of the variometer this way you don’t have to fumble with the nuts in the back of the instrument panel possibly dropping one into an inaccessible area.

     


  3. Insulating your capacity
    One cause for erratic variometer readings and drifting needles is a poorly insulated capacity. The capacity should not be placed directly against the glare shield of the instrument panel and should be of a good quality preferably with copper heat sinks inside. If the capacity must be near the glare shield or some where else you suspect is a heat source it should be further insulated with some type of foam insulation.

     


  4. Protecting your instruments from sunlight damage
    To preserve the colors on your sage instrument it should be protected from sunlight when not in use this is best done with a canopy cover on the outside of the glider or a cover for the instrument panel. Never leave the canopy up this can and will act as a reflector that can actually start a fire in the glider or at least damage the instruments.

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