REFLECTOR: Elevator Trim Spring

[Scott Baker]

While its interesting to think about the benefits of variable geometric
wings, canards, and winglets - lets remember the practical elements of
system design as it applies to weight, complexity of design and maintenance,
and of course cost.  The Beech Starship had a base list price of $3.9M when
it was introduced in 1989.  There are lots of cool things that would be fun
to try - given relief from $$ constraints.  The subject of pitch-trim has
been discussed on the Reflector off and on in the past.  The basic linear
actuator/fiberglass spring system works well to my liking.  I happen to
think it is one of the finer flying attributes of the Velocity.  If an
aircraft does not have enough pitch trim (in cruise or in slow flight) the
answer in most instances is to re-mount (adjust the location) of the linear
actuator so that it gives the needed travel.  Sometimes the fiberglass
spring needs stiffening - this can be done by adding a few plies of glass -
or replacing the spring with a new one from the factory.  A few builders
have installed linear actuators with an additional inch of travel (in order
to get enough up _and_ down trim).
Scott Baker