On Jan 31, 9:38*pm, Brad wrote:

When the trim is at center postition, is the stick force to move full
forward and full aft, less than the stick force when the trim is full
forward or at full aft position? This is not with the tail on and the
elevator providing any weight.

For the Schleichers I have owned, 19 and 28, the trim forces do not
change throughout the trim range. One end of the trim spring is
attached to the stick and the other end to a "fixed" point. The trim
is adjusted by moving the "fixed" point. The trim springs are steel
rods with one turn in them.

The significant difference between the 19 and the 28 is the way the
trim is adjusted. For the 19 it took one hand, for the 28 it takes
2. Not an improvement in my opinion.

The mechanism for the 28 is a bit more complex that I can describe
here but I'll send you a photo if you email me.

Without the trim springs the stick forces would be very light and the
glider would not be easy to fly. I assume the certifications
standards require a minimum stick force gradient but I someone else
can give you a reference.

Andy