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Discussion Starter #1
For two years I have been getting around locally, (within two miles of my house), on a wheelchair the VA gave me.
It has been excellent exercise and has gotten me interested in other exercises too. Since I got it, it has had one fault.
Going down hill I have had to hold it back as the front caster wheels tend to speed wobble, chatter, as soon as it gets above 6 mph
most certainly above 7mph. This chattering of wheels is nearly enough to throw me out of the chair when it starts.
I just thought it was natural to wheel chairs so I did nothing about it. I use the chair a lot and am now on my third set of caster wheels and third set of the big driving wheels too. I was bitching about the wheel chatter on a disability forum last week and one of the guys told how to adjust tension on the casters. So today I popped the hard rubber caps off of the caster swivels and saw a big 19mm nylock nut on each one. I used a socket to tighten each about a quarter turn, so that the caster still turned with my fingers but no longer flopped to either side by gravity when the front of the chair was lifted. I went down a long shallow hill to the bank at about 8 mph with no chatter. This was on a stretch where I usually had to hold back speed to prevent chatter. I was impressed. In the afternoon, I went the mile and a half to the coffee mill in the other direction.
This had two uphill sections steeper than the morning ride. On the way back, down the steepest hill, I let her roll out. I was soon going better than about 12 mph with no chatter. I only held back a little to maintain steering control because of other traffic. I had enough momentum that I coasted about a hundred yards past the bottom of the hill before I had to start using my hands to propel the chair. Suffice to say that I am happy with the results.
 

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Excellant race-prep removing that pesky lateral run-out for improved high speed stability! Good job!
VA doesn't get their stuff from Maserati, so there are lots of hgheri-tec but hgheri-dollar options out there. 3.jpg
 

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Good work Phelonius!
Most every mechanical contrivance can be improved. Happy to see you upping the FUN & SAFETY factors in yours.
Old MG cars ad slogan: "Safety Fast!"
 

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Discussion Starter #7
Speed is guestimation but probably pretty close. My electric mobility scooter goes 8 1/2 mph measured by stop watch over known distance so I know what that speed is like.
My wheelchair was going at least half again faster. It is an ordinary Quicky 2 chair, not one of the performance models like athletes use.
If I could find my old GPS I could get a read on it.
 

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Discussion Starter #9
My Rokon is as loud as a lawn mower now. I just took it out and it has an electronic speedometer on it. I rode it on a side street at different speeds trying for the felt speed of the wheel chair.
Upon this re assessment I think my wheel chair on that down hill may have been exceeding 15 mph, and to think I was holding it back a bit for steering control. The mind boggles
at those velocities. And after thinking how far it coasted after the bottom of the hill that higher speed makes more sense. Yeeeehaaa! If only I could hand power it that fast on the level ground. BTW cards with clothespins are no good. They hold back the speed.
 

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Are those speeds estimates or is there some kind of speedometer on that thing?
GPS, I am sure he has it on. Missing a turn and winding up in the bottom of a canyon at night it is the beacon of hope. Joking aside, glad you have your wheels fixed up. A set I hope I never have to use. At least they get you out of the house. I had thought of making a system on a three wheeler that you could load right into the rear, lift up the tailgate, grab the handle bars, fire it up and go.
 

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Discussion Starter #11
When I get the license plate on the Rokon, I will be carrying one of my wheelchairs with it. It is the narrowest sidecar machine I have ever ridden.
Except a mini bike I once built with a hack 50 years ago. Because of the narrow wheelbase it is a bit squirrely on right hand turns. I have partially solved that by filling the sidecar wheel with water for ballast.
 

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Use antifreeze in the side tire. Used to do that to lawn mower tires for side hill cutting. If you can, move up to the athletic chairs.
 
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