Re: Taxiing before first flight. (long editorial)

Allan Farr <afarr@...>

Hi Jim
That helps clear it up. I had always thought a locking tailwheel (& a grippy tyre) would help, it's the first time I have read or realized that someone is using one.


Reread my comment. I didn't like the idea of loosing control and not
being able to get back to center line way before I installed the
brakes. This was obviously the opinion of a lot of others as well and
today you see the results. QAC designed a pretty rudimentary airplane.
Cheap was a word that was in their vocabulary.

Further as David pointed out, we discovered a long time ago that
keeping the tailwheel straight as possible on take off or landing was
a must in a Q. If you could prevent twitchyness you had much better
control. Tailwheel/rudder differential via the bellcrank with internal
springs to the tail wheel to absorb side loads and Air Products
locking tail wheel did the trick. The new locking/swiveling tailwheel
has a 6" bellcrank and the stock rudder has a 3" bellcrank. We simply
installed an additional 6" bellcrank behind the FS120 bulkhead. The
tailwheel cables attach to the internal bellcrank at 6" (same width as
tailwheel bell crank) via springs and the rudder cables attached to
the internal bellcrank at 3-4" (same as rudder bellcrank) from rudder
to internal bellcrank. Thus a desensitized tailwheel/rudder with
proportionally more rudder travel for a given tail wheel input.

Hope this clears it up and why the bellcrank/tailwheel combo is a
valuable asset on this airplane. Add Gall Alignment and toe brake mod
and you have a stable airplane.

Jim Patillo

Join to automatically receive all group messages.