Chris Bruner writes, in regard to Mark Drela's post,
...Decalage refers to the incidence of the tail relative to the
wing, and DOES affect the handling (note that if you compensate with
elevator, you've not changed the decalage). Too much decalage requires too
much nose weight and makes the
In theory this is correct. In reality the theory leaves a little to be
desired - when working with very small static margins.
Decalage is the last thing I tweak up when I'm trimming out a new fixed
stab airplane. (Although sometimes if the decalage is way off it will need
initial tweaking
Mark Drela wrote:
If changing the decalage on the glider DOES produce a noticable change in
handling, then one can conclude that the elevator response is nonlinear,
which indicates something bad and draggy is happening.
Two instances of "bad and draggy behavior" were the same error in
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