Do a search on this newsgroup using groups.google.com for threads
relating to tall pilots--there have been quite a few over the years.

One caution is that the torso/leg length ratio is as important as
overall height. The original Ventus and Discus, for example, had good
leg room but were tight for pilots with long torsos, at least without
what I consider to be extreme measures such as parachutes stowed behind
the pilot's head (because of the danger in a crash of it breaking your
neck).

The parachute can also be a critical factor. Some parachutes have more
thickness in the lower back, others behind the shoulders (the former
works better for me, allowing me to recline more). Some have comfort
foam, which increases the thickness, some not. Sometimes even the way a
rigger packs the parachute will have an effect.

Removing the adjustable back rest may provide enough room to get a tall
pilot into the cockpit. If you're buying new, the factories will often
work with you. For my ASW 24, for example, Schleicher provided an
aftermarket instrument panel with higher cutouts for the knees, omitted
the rudder pedals (only the metal bars are there) and moved the
mounting forward a few cm, and replaced the adjustable seat back with
the covers for the baggage compartment used in the motorglider; they
form a nice backrest.

Chip Bearden
ASW 24 "JB"