Olin Lathrop wote:

... I'll probably plunk down a dsPIC with enough PWM modules to make driving
the hobby servos easy to allow me to concentrate on the control algorithm.
The
extra electrical power for the dsPIC should be small compared to that
required
by the servos anyway...


You only need a basic hardware PWM to generate your 4 servo outputs. Five
resistors and a little ISR will do. Easy to get 250ns from a 8MHz clock from
the hardware PWM, without glitches, although deadbands of 2-4us are usual in
the middle-priced servos, so usually there is no need to go beyond 1us of
resolution in the PWM's.

Split ailerons (split "ailevators", in this case) (or whatever the right
name
is in english) are usual to control fin-less flying wings (Northrop YB-49,
i.e.). If you keep the numbers in the integer field, I think it will
comfortably fit inside a PIC18.

(Perhaps) interesting links:
Ren=E9 Arnoux "Stabloplane", "Stablavion" and family:
   http://www.ctie.monash.edu.au/hargrave/arnoux.html
Alexander Martin Lippisch flying wings and deltas:
   http://www.ctie.monash.edu.au/hargrave/lippisch.html
Horten brothers flying wings:
   http://en.wikipedia.org/wiki/Horten_brothers
Northrop wings:
   (I think you don't need points to them... :o)

Regards.



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