REFLECTOR: Elevator Trim Spring

[Pat Shea]

Alex,

The relationship between the wing and canard is
relatively accurately set by the incidence gauges. On
the other hand, the neutral position of the elevator
trim system is very roughly set by the TLAR method
(That Looks About Right). If I recall correctly, the
directions read something like "Remember, you'll need
more up trim (elevator trailing edge down) than down
trim." Consequently, I suspect most builders end up w/
too much up trim and run out of down trim at high
speeds. This is by no means any indication that the
wing to canard configuration isn't correct.

It's been my experience that the standard elevator
trim system has enough throw to cover both the high
and low speed ends of the envelope - you just need to
fine tune the neutral position.

Pat XLRG

--- Alex Balic <alex157 at pwhome.com> wrote:

> I was under the impression that the starship used
> variable sweep on the
> canard, not variable incidence- this increased the
> lift authority at slow
> speed (extended)  and reduced drag at high speed
> (swept) I agree that there
> is a fundamental design feature to keep the canard
> stalling before the main
> wing, but the particular aircraft that we are
> discussing might need an
> adjustment of canard incidence to correct the pitch
> authority problem
> without going so far as to allow the wing to stall
> before the canard-
> really, a close and precise gauge of the incidences
> relative to each other
> will determine if adjustment is needed.. 


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