It is not that easy. While working on Xceed chair we face a lot of stupid things done in the industry. Non-marking tubeless tires in traditional wheelchair sizes do not exist or I haven't found one yet.
Finding split rim wheels is a challenge as well. For small guys making everything yourself is cost prohibitive.
Burgerman wrote:It is not that easy. While working on Xceed chair we face a lot of stupid things done in the industry. Non-marking tubeless tires in traditional wheelchair sizes do not exist or I haven't found one yet.
The chinese will manufacture any tyre in any colour, style, size, to suit any application in relatively small quantities. They do this for own branded scooters, toys, carts, etc. Many are available as samples or requests. And. Why would you want to use that size anyway? They are too skinny for the weight and sink, and theres many other sized tyres available. Just because the industry use 3.00 x 8 for almost everything doesent mean you should. As for caster tyres, bigger is always better. Those things need to float over soft stuff, and not transfer shocks or bounce off ridges or edges.Finding split rim wheels is a challenge as well. For small guys making everything yourself is cost prohibitive.
Again. Why would you WANT split rims? I went out of my way to find rims that were NOT split rims, and were proper tubeless rims so as to get over the stupid solid spine jarring tyres, or the tubed pop here we go again ones! Look here: download/file.php?id=7426&mode=view £9 each... One at a time, in 2.5 or 3.5j widths and 8 inch.
Compared download/file.php?id=7646&mode=view
download/file.php?id=7648&mode=view
Fitted with 3.00 or 3.50 x 8. Or the wider one 120/70-8 as I have on my chair.
Burgerman wrote:
I like the new brushless motors, provided theres a decent system like r-net for eg to match them. Not a recently developed one off specifically for your chair for a number of reasons. Also in the vid seating is too high up, Legs too far forwards. And it looks unstable. So climb a steep ramp or drive off a curb at speed and you look like you will end up the wrong way up. CG too high.
Also in your vid I see the user/seating sway side to side, like its not rigid enough as all the extending wheel arms etc flex. Couldnt live with that. And lift up arms are the same. Too long, introduces flexibilirt making accurate control impossible once programmed to respond properly so I can use it. I just paid extra to dump a set of those and have very solid single post arms instead, and threw away the swingaway joystick mount for the same reason. If it moves/wobbles its unusable.
Also dont shoot the messenger but presumably you need people to buy this? Well even with powerchairs people like style, simplicity, and good looks. However you have made it look like a pram. And people will not go for that look. I know you see this as all negative, but you did ask. And it must be said. But I dont mean to be negative. Just pointing it out how I see it.
Burgerman wrote:No. And theres none from Dynamic other than the one we cant get as its built specifically for Invacare, and non from curtis instruments, curtiss wright etc either. And as it stands the R-net system with its extremely well evolved drive software, and masses of different modules and options is about as good as it gets.
Take a look at the programming software for eg.
See PM.
If there was a well developed system I would already be using brushless geared motors. Probably. But heres the thing. The BRUSHED motors work almost as well in efficiency terms. Most of the losses are actually in the gearbox. So in range terms theres not a lot in it. And brushed ones with motor load compensation offer a better feel and user feedback than a locked system that sensored brushless motors give. You can fine tune it probably but unless they are gearless too theres only a tiny gain in efficiency. Although it all helps.
Both use Roboteq controllers and same script for motor compensation.
Both use Roboteq controllers and same script for motor compensation. Efficiency gain is around 10-15%.
We come from different worlds. Bikes vs cars. In car world we cover up as much as possible. It does not take away from engineering, in my view it adds.
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