Originally Posted by
Caribou2001
My initial thoughts on requirements:
must be able to transport a non-ambulatory individual: should be able to strap-in securely (i.e. 4-5 point harness)
must be comfortable
must be safe, i.e. front brakes, no small-diameter casters touching the ground...
no need to be able to compete in TT, just for toolin' around
Do you absolutely have to have a trike? If not, you may be able to refit a
bakfiets to carry this person.
Clever Cycles in Portland carrys them and I'm sure there're other sources.
On the other hand, a quick Google of "wheelchair bicycle" found this:
http://www.frankmobility.com/duetfeat.php
It specifically says that the "wheelchair" portion incorporates drum brakes, and it looks like the casters don't hit the ground when the "bike" is attached.
If you want to
create something, you should probably get in touch with
HPVOO. Otherwise, you'll probably get away cheaper, faster, and more reliable if you find a commercial product. No need to reinvent the wheel.