Doug Sipprell's blog archive for March, 2009 - RC Groups
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Archive for March, 2009
Posted by Doug Sipprell | Mar 24, 2009 @ 08:03 PM | 10,823 Views
Having flown T-Hawks for a few years now, in various configurations, I have come to learn that the most fragile part of the plane is the boom, just before the tail feathers, where the control rods exit to connect with the elevator and rudder. Seems that most T-Hawks, when they crash, are in "lawn dart" mode at the time of impact. The inertia of the tail feathers assembly is enough to cause the boom to flex at this location, resulting in a snapped boom, bent push rods, and no way to fly the plane until a boom replacement is made. The replacement is more difficult than one would think, having to remove the original (or 2nd, 3rd, etc) and then run the control rods, antenna through the new boom. The process is further complicated now that has closed it doors (for the moment ). I decided to experiment with some aluminum tubing, to act as a long sleeve over the fractured area. The taper in the original fiberglass boom (on standard T-Hawks, not the trainer) is sufficient to prevent sleeving the entire boom. I wanted the aluminum sleeve to fit tightly without having to be oversized so as to fit the larger diameter of the stock boom where is connect to the fuselage pod. The procedure was basically this:

1.) Removed tail assembly, with fin and stabilizer intact. I disconnected the control rods from the control horns.

2.) Removed any ragged edges from the broken boom tubing.

3.) Prepared an aluminum sleeve, using a K&S 3/8"...Continue Reading