Click Here to return to the Index

Sailplane Construction Project Session #11

I have been doing considerable planning and experimenting on techniques to keep the 1/8" wire landing gear rear strut from sliding sideways in the slotted block shown below. The three brass tabs holds the strut tight in the slot, however a shock load resulting from a hard landing can and will drive the strut sideways in the slot under the brass tabs.
The solution I finally came up with is illustrated in the following test case. First I filed a transverse groove in a piece of 1/8" piano wire with a triangular needle file as shown below. 
Next I laid a piece of 20 gauge copper wire in the groove and soldered it in place as shown below.
The copper wire was cut off on each end and filed down flush with the edges of the 1/8" piano wire and then rounded off slightly as shown below. The height of the copper wire is the same height as the brass tabs used to clamp the rear strut in the slotted block.
This test case was put into the fuselage's slotted block up against the No. 1 brass tab. As you can see below, this "stop" restrains the 1/8" wire from moving to the right in the picture below.
After having worked out all of the details on the test case, I marked the rear strut to locate the inside edges of the two outside brass tabs and soldered on two "stops" as shown below. Notice that there is a solder filet on the inside edge of the "stop", but that the outside edge has had the solder filed away.
The picture below shows the landing gear rear strut clamped in the slotted block and restrained from sideways movement by the two "stops" against the inside edges of the two outside brass tabs.
Before I stopped working for the day, I wrapped the two junctures of the landing gear rear strut with the forward strut with 24 gauge copper wire as shown below. 
This is close up of the right juncture's copper wrap.
Tomorrow I will fire up the big iron and solder the two cooper wrapped junctures. I also have to come up with a cross wire configuration to restrain the landing gear legs from spreading too far on a hard landing.................................Tandy

Click Here to go to the next page (12)....