REFLECTOR: Elevator Trim Spring

[John Dibble]

Where can I get an actuator with more travel?

John

Scott Baker wrote:

> 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
>
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