http://boulderlabs.com/bob/GRAYCHAIR/
I needed to go fast with my dogs. Up thru January2017, the ew36scooter at 15mph
worked for me. but then i needed a chair. my craigslist quantum6000z
was painfully slow at 6mph.
- going fast on ew36 scooter
what a project! It started in February 2017 when I began reading
wheelchairdriver.com. I liked Bergermann's ideas: rear wheel drive,
soft large suspension tires, higher speed, narrow chassis, lithium
endurance. I bought a used permobile C350 from Craigslist to begin the
project. it was even slower:4.5mph . I fitted it with large
lawn tractor tires- it is 30" wide. I bought a roboteq controller
and strapped additional batteries on to the seat back to give
a 48 volt system. And sure enough it went fast: 14mph. The
next challenge was how to make the chair narrow enough to use
indoors and to go through doors.
Summer of 2017 I was getting more familiar with Roboteq and
lithium batteries. with small modifications to the C350 I
was able to fit two 35 cell packs (7S5Pxtwo) into the wheelchair
(14S 5P =46volts 60Ah). september 2017 we switched from
lead/acid to lithium batteries and the results were great. the
challenge was how to make a C350 with wide tires fit through
doors. The plan was to buy a new C350, chop up the frame,
make it narrow and pack in lithium batteries.
- lithium plan w roboteq
I began looking for someone to help me modify the metal frame
by cutting and welding. A neighbor Jason was able to help
with this project. He suggested that anything that we could
buy instead of fabricate would save time. Then I bumped into
Kilmore on the forum- he was building frames that would accommodate
my needs. He agreed to build a frame including motors, tires, elevator,
and some seating for me. My job was to add the wires, the
electronics, the controller and the lithium batteries.
While Tom Kilmore was building the frame in England I was
refining circuit diagrams wiring controls and joystick. I
received the frame from England late November 2017. The tasks :
* fitting the lithium battery packs,
* hooking up all the wiring,
* hooking up the joystick controls
* seating modifications needed.
Given my limited resources to skilled labor the next phase of
this project took months. by early February of 2018 the
wheelchair was driving. We are now making refinements to the
Roboteq software, seating functions, and joystick attachments.
- mostly complete
i can't wait to see the finished product!
You have a pretty chair for sure. 
Sure would be a shame to scratch it all up. 
It would be very important to have the turn acceleration turned way, way down when up at anything more than 10 mph. 
