by Burgerman » 07 Feb 2024, 21:23
Quite apart from the stupid programming issues that make all chairs unsteerable and dangerous as you describe, the Q700 R in common with many others have other CG related issues.
These are several ADDTIONAL problems with the Q700R chair beyond just programming:
1. The front casters are very close together. Designed by someone in the marketing department. Along with the "boat" swinging axle rear suspension. It means that even with an (essential) centre mount footrest you cannot move the seating system far enough back without a massive fight as the rear edge of he footrest cannot fit back slightly between the wheels as required. Why is that important? Because as stock, most of the users mass (your weight) sits hanging over the front end. This heavily loads up the front casters. So the chair doesent want to turn. When enough stick (and time with stock programming) is applied it eventually makes enough torque and "unsticks" the casters at some point, and then shoots left or right suddenly and not under control. As you foundout. It also rucks up carpets due to the huge amount of rear wheel torque required and on slippery or loose ground makes the rear wheels slip instead of you actually turning. Especially on uneven ground. Frankly its rediculous. This isnt the only chair configured this way. Most rear drive chairs are. But it makes the steering situation and proper control even worse! So you MUST try and mitigate this by fitting the same small diameter front tyres (like rollers) that I did, and removing the front fender/mud guards. This allows a centre plate to come back at least some of the way. It isnt a total fix but it is a massive improvement. It allows the seat/footrest to go back around 3 inches or more depending on where it is right now. Bin the curb climber its in the way.
2. Gyro. Many Q700 chairs have one as stock. Its not actually possible to make a chair steer in fully accurate linear controlled fashion. Now on the front drive version, its needed. But those cannot ever be made to steer properly whatever you do so it is what it is. On a mid, drive its way better without. On a rear drive its completely rediculous unless you are using alternate non proportional controls. But fixing this is simple. Just turn it off i programming at the same time as we set all the turn settings properly so the damned thing turn WHEN its told. By the exact amount that its told. And stops turning the instant you tell it to! Thats easy. Remove a few walls, set a few parameters and it will steer like your dads chair did. And what a relief that is!
I will elaborate later. I need your settings file. And I need to know you have normal hands, and correct joystick technique. Ie, hold(cup) the joystick side, use finger and thumb for control. You may need to move and adjust the joystick position to be able to do that.
But she will be coming to my home with it so she can test the settings which suits her. 