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Flying Knights Newsletter

2000 Second Quarter

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Recent Sightings

Meeting Happenings

 
Bill Eberhard makes
connection with
soldering review

        In March, Bill Eberhard gave us a demonstration of the techniques of soldering.
        Many times in our hobby, it is necessary to join two pieces of metal or one reason or another.
        Billís example was the fairly common one of constructing a landing gear. When we find that the gear is not delivered in its final shape, (curses) then it becomes necessary to take the work by the horns and set it to the torch.
        For large items such as struts where a great deal of abuse is expected, the metal area can be quite large. An ordinary iron simply canít get the work hot enough.
        Bill then tightly wrapped ordinary small gauge copper wire tightly around the pieces he planned to join. This served to hold them as well as conduct heat to the area. The most important thing was to make sure that the flux thoroughly reached the entire joint.
        Flux is an acid which prepares the surface of the work so that the solder can flow easily. Acid flux is used on metals, whereas rosin flux is used whenever electrical circuits are involved. Two dissimilar metals in an acid is known as a battery.
        Bill used a small torch in order to apply enough heat to the work. the rule for successful soldering is that the work must melt the solder, not the iron.
        After soldering the wheel strut, Bill passed the finished work around. It looked great. Bill next took on the common but necessary task of soldering clevises to control wires. Here the iron was sufficient, but he emphasized the

importance of flux in ensuring a good solid union.

        Bill mentioned one of his pet peeves, giant Z-bends in control rods. Many a crash has been traced to this practice.
        When setting up the control horns, the correct method is to maintain a straight line all the way from the horn location through the fuselage to the servo.
         A dramatic demonstration using a piece of wire with a z-bend and a straight piece of wire quickly made the point. Bill took a hammer and pounded the wire into a block of wood. The straight wire went through the wood but no matter how hard you hit the bent wire it never penetrated.
        This was a very informative presentation and people learned to appreciate the finer points of the soldering process.
 

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Finding your way in days gone by

        In January we were pleased to have Hugh Spears describe how navigation was done in the days of bolts and bailing wire.

        After the war he ferried planes from the manufacturer to the customer. This was before the days of Nav Aids such as DME (Distance Measurement Equipment) or Tacan, so finding the course involved the tried and true methods of Dead- reckoning, basically, a compass and a map.
        These techniques are still used by pilots of small aircraft at country airports.
       Much of the advance in navigational aids was tied to the weight of the
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