Invacare Boards

General Invacare => General Chair Chat => Topic started by: SweetBearCub on August 01, 2009, 09:10:46 am



Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: SweetBearCub on August 01, 2009, 09:10:46 am
I have a TDX SP with the MK6i electronics and an SPJ+ joystick (which, oddly enough, says "MK5 SPJ+" on the label on the bottom of it).

I may have a chance to buy an MK6i MPJ+ joystick from a neighbor who got some parts from a wrecked chair for a battle bot project.

I'd like to have the joystick, even though I have no power options, since it has a more sensitive battery meter (10 units instead of 8) and it can support various profiles, such as one for maximum speed/responsiveness outdoors, a much more conservative setup indoors, another for maximum torque when needed, and one more with minimum settings for when my batteries are almost dead and I'm limping home.

Are these two joysticks a direct swap?

Thanks!


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: jakeyboy1 on August 01, 2009, 06:04:36 pm
In MK6 you can swap. However, you will need to make sure you get the adaptor cable from the other wreaked chair.  For the MPJ you need a 4pin to 7(or 9,not sure) pin adaptor cable.
Furthermore, in the MK6 world, all program settings are stored in the joystick. When you plug in the new joystick you bring all the settings from the other chair. You will need a programmer to "erase all" and re-program to your chair.  This is not hard to do, just making you aware of what you need to do.

If you decide to do, I will email you step by step instrucrtions if you need them.

My 2 cents. The MPJ is way better then the SPJ.


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: SweetBearCub on August 01, 2009, 06:50:11 pm
Quote from: jakeyboy1;1855
In MK6 you can swap. However, you will need to make sure you get the adaptor cable from the other wreaked chair.  For the MPJ you need a 4pin to 7(or 9,not sure) pin adaptor cable.
Furthermore, in the MK6 world, all program settings are stored in the joystick. When you plug in the new joystick you bring all the settings from the other chair. You will need a programmer to "erase all" and re-program to your chair.  This is not hard to do, just making you aware of what you need to do.

If you decide to do, I will email you step by step instrucrtions if you need them.

My 2 cents. The MPJ is way better then the SPJ.


Jake,

Thanks for the prompt reply.

My neighbor may not have the adapter, but I can probably get one somewhere. It shouldn't be that hard, right? He's out of the area for a while, but when he gets back, I'll buy the joystick from him. He's charging me somewhere less than $100 (his words), is that a good deal?

Will having a different joystick on my chair adversely affect getting it serviced? Since the joystick is bare (no mounting arm/pole) can it attach to the same mount as my SPJ+?

Next, I'm sure I can borrow the programmer from the tech at my local shop (He's very laid back/understanding), as long as I don't take it out of the building. Once I clear the settings and put new ones in, can they be fine tuned from the joystick? I read somewhere that the MPJ+ supports TTJP, though I have no idea how flexible it is. How do I access it?

When I am reprogramming the joystick, can I use the programmer to change the names of the drive profiles, or will I be stuck with default names? Also, what is the difference between the pro and the user/basic memory card?

Once I have it in my possession, I plan to put a screen protector over the display, and either very small strips of screen protector or scotch tape over the on/off/drive, slow/fast, and mode legends near the knobs - I hate seeing stuff like that worn away from use. Anything else you can tell me about it would be appreciated.

Lastly, why is the MPJ+ so much better than the SPJ+, in your opinion? Just the ability have multiple profiles?


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: jakeyboy1 on August 01, 2009, 07:35:43 pm
MPJ msrp is $750 on chair and $995 off chair.  A working MPJ for $100 is a great deal.

Having a different joystick will not make any difference in servicing the chair.  Except if the MPJ dies, your funding source won't pay to replace it since they didn't purchase it with the chair.  

The MPJ has a different mount. Go to http://www.invacare.com, click on parts catalog and you can see pics.

To access TTJP in MK6 you need a pro card.   Just plug the pro card into the joystick, turn on, and the joystick becomes the programmer.  It is not very easy to program this way but possible.  They only way to get a pro card is to buy a programmer and one comes with it.

Changing drive names.  With a programmer or pro card you can do this.  

I think the MPJ is so much better because of the ability to have multiple profiles.  I like to have a indoor (slow) drive, speed/fast (high speed, low torque), and ramp (high torque/power low speed) drive.  

If you want to get a programmer, check out ebay.

Good luck!!  Glad to be of help.


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: SweetBearCub on August 01, 2009, 07:51:50 pm
Quote from: jakeyboy1;1857
MPJ msrp is $750 on chair and $995 off chair.  A working MPJ for $100 is a great deal.

Having a different joystick will not make any difference in servicing the chair.  Except if the MPJ dies, your funding source won't pay to replace it since they didn't purchase it with the chair.  

The MPJ has a different mount. Go to [removed due to insufficient post count], click on parts catalog and you can see pics.

To access TTJP in MK6 you need a pro card.   Just plug the pro card into the joystick, turn on, and the joystick becomes the programmer.  It is not very easy to program this way but possible.  They only way to get a pro card is to buy a programmer and one comes with it.

Changing drive names.  With a programmer or pro card you can do this.  

I think the MPJ is so much better because of the ability to have multiple profiles.  I like to have a indoor (slow) drive, speed/fast (high speed, low torque), and ramp (high torque/power low speed) drive.  

If you want to get a programmer, check out ebay.

Good luck!!  Glad to be of help.


Jake,

I'll see what I can do about getting the adapter and mounting arm. Hopefully it should not be too difficult, even if I have to buy them from Invacare. I'll see if my tech can't order them. He's also looking into ordering manual wheel locks for me. I know they're cheap, only a $45 option on the order sheet, and they should prevent me from getting motion sickness due to the play in the gearbox when I'm in a vehicle.

As for needing the pro card to activate TTJP - Aren't the memory cards standard SD cards with different (PC accessible) files on them? If so, is there anything preventing me from borrowing the pro card from my local tech and taking the basic card out of the joystick, erasing it, and copying the contents of the pro card onto it?

Also, once I get my hands on a pro memory card - Although I'm sure the TTJP interface is less than optimal, does it allow access to all of the options a normal hand-held programmer has?

Oh yes - Now that I have the appropriate controls - If I should ever come upon a compatible tilt system on an old or wrecked chair - Can it be swapped over?

Now, if only the MK6i electronics would allow access to an odometer and speedometer display, I would consider the system complete. Unfortunately, I read that Invacare removed that, why I don't know.

Thanks again...


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: jakeyboy1 on August 02, 2009, 01:29:19 am
Regarding creating your on "pro card": I have not tried that.  I'm not sure if it would work.  Worth a  try.  I have programmed chairs with just the pro card and it is worth getting the programmer.  I can program a chair with a programmer in 1min what a pro card would take 10.  (considering I do this for a living, it is worth it)

Getting a tilt to work with your base: If the tilt wasn't designed for your base, it would require a fair amount of fabrication to make it work.  

Reguarding odometer and speedometer: I hear that in MK7, it will be standard, and a clock too.


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: SweetBearCub on August 02, 2009, 04:08:07 am
Quote from: jakeyboy1;1859
Regarding creating your on "pro card": I have not tried that.  I'm not sure if it would work.  Worth a  try.  I have programmed chairs with just the pro card and it is worth getting the programmer.  I can program a chair with a programmer in 1min what a pro card would take 10.  (considering I do this for a living, it is worth it)

Getting a tilt to work with your base: If the tilt wasn't designed for your base, it would require a fair amount of fabrication to make it work.  

Regarding odometer and speedometer: I hear that in MK7, it will be standard, and a clock too.


As soon as I can find a USB SD reader/writer (too bad they're not microSD, my PocketPC can work with them natively..) and I have the MPJ+ with the basic card in my possession, I'll drop by my tech's shop and see what I can arrange. If it works, great. Will the professional card hold all my settings, or will I need to buy another SD card and turn it into a basic card by moving the appropriate files onto it?

Although I agree that a programmer would be preferred, that's an extra $125 to $300 that I can spend on other more important things. As long as the card allows me to reprogram my chair, that's fine. Once I've fine-tuned each drive profile, I don't foresee the need to screw with them very much. Besides, if I really need a programmer, I can probably manage to borrow my tech's as long as I use it at the shop.

Having an odometer and speedometer in the MK5 electronics, removing them in the MK6i and putting them back in the MK7 is a slap in the face to everyone that has MK6i systems. For as much as these things cost (and also the fact that they're very similar to the MK5 systems), they should send out a software update that gives them back to us.


Title: Pro Cards
Post by: DREDD on August 02, 2009, 02:02:28 pm
YES YOU CAN
The pro and basic cards are just a standard SD card and can be used for anything, they have 128mb storage. Just delete the files from the basic card and copy ALL the pro files across and, bingo, you have a pro card. You will need a card reader and PC, then use the cut/copy and paste procedure. I do it all the time as our service agents use them as backup programmers and to store multiple client profiles. You can use them in your camera as well...


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: KiwiJenn on August 02, 2009, 05:57:40 pm
Quote from: jakeyboy1;1859
Reguarding odometer and speedometer: I hear that in MK7, it will be standard, and a clock too.

:D:DWonder where they got those ideas from, mainly the 2nd one:D:D


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: jakeyboy1 on August 02, 2009, 10:35:22 pm
customer feed back, and trying to keep up with Quantum....


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: SweetBearCub on August 02, 2009, 11:16:37 pm
Quote from: jakeyboy1;1863
customer feed back, and trying to keep up with Quantum....


If they wanted to truly keep up (or exceed) Quantum, they'd take the design features the high-end Q6000z and incorporate them as standard equipment, for an immediate competitive advantage.

Their optional electronics? 100A & Q-Logic
Their optional speed package? 8 MPH
Their optional batteries/charger? Group 24's and an 8A charger.

Other options include a lighting package and wider tires for better traction.

If Invacare could duplicate this equipment, or exceed it, they would have an extremely solid advantage. And before anyone brings up the cost argument, I see no good reason for any of these things to cost Invacare a significant amount of cash over the normal build cost of a standard TDX SP. Of course, you can bet they wouldn't tell us that. They'd have us believe that the upgrade from a simple LED single profile joystick to one with a monochrome LCD and 4 profiles is worth $750 at a minimum. In truth? It's worth about $75.

Some day, should I ever have the money, and I meet someone who is good at engineering, I really would like to just order some parts and build my own high-spec chair. 120A controller, gearless/brushless motors, 8-10 MPH top speed, soft super low pressure tires for superior ride quality with kevlar reinforced rubber for superior puncture resistance, standard LED lighting, lithium-ion (or better) battery system, standard color LCD joystick with odometer, speedometer, and clock, multiple profiles (and battery gauge displayed as a percentage with 1% resolution), frame constructed of aluminum or other extremely strong & light material, etc.


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: KiwiJenn on August 03, 2009, 12:21:46 am
Sorry guys I kinda changed topic didn't I.

Well I've been discussing things with Mike for awhile now about why some MK5 features were removed from MK6 and giving him a list of features I'd personally like to see added as an upgrade to MK6 or added to the MK7 when it comes out in the future.

When I read your reply jakyeyboy1 about the two features been added to the MK7 I got excited:D but I guess we will all see what will be an upgrade or added to new electronics.  Time will tell.

Quote
Originally Posted by jakeyboy1                     (http://www.invacareboards.com/forums/images/smooth/buttons/viewpost.gif) (http://www.invacareboards.com/forums/showthread.php?p=1863#post1863)                
                 customer feed back, and trying to keep up with Quantum....
Their optional speed package? 8 MPH - Pride lost the Torque/Power by increasing the speed I'm guessing.  To get the Torque Invacare needed to lower the speed by 1km/mph which isn't to much.  But yea it be nice to have 8.5mph and the Torque but I guess we can't get it both ways.  I was thinking Invacare should have two type of HDTTGB motors, 1 at 7.5mph max speed including Torque and the other HDTTGB set as a speed motor at 8.5mph or 10mph WOAHHHH

Their optional batteries/charger? Group 24's and an 8A charger. - TDX SP and TDX SR both come with 22 and 24s, if you get Elevate you get 22s or I guess x3 22s

Other options include a lighting package and wider tires for better traction. - Invacare NZ sell this
The TDX SP RAM (pole motors) can get up to speeds of the TDX SR with GB motors.
(http://www.invacareboards.com/forums/photoplog/images/1/medium/1_tdx-ram_large.jpg)
CLICK ME (http://www.invacare.co.nz/index.cfm/1,134,898,33,html/TDX-SR-SR-RAM)


Yea I'd love to do the same.:)

Quote
Posted by SweetBearCub - Some day, should I ever have the money, and I meet someone who is good at engineering, I really would like to just order some parts and build my own high-spec chair. 120A controller, gearless/brushless motors, 8-10 MPH top speed, soft super low pressure tires for superior ride quality with kevlar reinforced rubber for superior puncture resistance, standard LED lighting, lithium-ion (or better) battery system, standard color LCD joystick with odometer, speedometer, and clock, multiple profiles (and battery gauge displayed as a percentage with 1% resolution), frame constructed of aluminum or other extremely strong & light material, etc.


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: SweetBearCub on August 03, 2009, 09:34:11 pm
Jenn,

While that modified TDX SP looks nice, its specs seem to be the same disappointing specs as the US-spec model, or darn close.

The specifications page lists its maximum speed as 9.6 KPH, which translates to about 5.925 MPH, an increase of only 0.125 MPH.

The TDX SR does 7.0 MPH, which translates to 11.34 KPH.

Or am I just missing something?

Thanks...


Title: The Ram
Post by: DREDD on August 05, 2009, 01:53:35 pm
Well, actually, we don't know how fast it really goes. It is faster than a TDXSR, that much we know, it gets up to speed quick, bit hairy on the turns and it's fun to drive. We are doing a similar set-up on an ARROW with GBs, now that's going to rocket.


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: SweetBearCub on August 05, 2009, 02:06:35 pm
Quote from: DREDD;1868
Well, actually, we don't know how fast it really goes. It is faster than a TDXSR, that much we know, it gets up to speed quick, bit hairy on the turns and it's fun to drive. We are doing a similar set-up on an ARROW with GBs, now that's going to rocket.


Can I ask what the setup entails? Is it just larger tires than the stock 14"x3" mounted on a modified wheel? If so, can you give me details on the dimensions of the wheel, any needed adapters, and the tires?

Also, I seem to recall from the wheelchairjunkie board that larger tires (or maybe only wider tires?) put an increased strain on the drivetrain, leading to breakdowns. How is that compensated for?

Thanks...


Title: The Ram
Post by: DREDD on August 06, 2009, 01:49:07 pm
Technically, this is still a prototype and we haven't yet had any major problems or ironed out the bugs. The tyres are 16", the hubs were designed to fit the 4 pole motors, the front castor mounts were remade to get the castors away from the tyres. New guards are fitted to clear the tyes. We were concerned about the power module overheating but it seems to be handling it. I think we have 2 in the country, not sure, but we are looking at getting Invacare US to build these as part of their range.


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: SweetBearCub on August 06, 2009, 07:35:57 pm
Quote from: DREDD;1870
Technically, this is still a prototype and we haven't yet had any major problems or ironed out the bugs. The tyres are 16", the hubs were designed to fit the 4 pole motors, the front castor mounts were remade to get the castors away from the tyres. New guards are fitted to clear the tyes. We were concerned about the power module overheating but it seems to be handling it. I think we have 2 in the country, not sure, but we are looking at getting Invacare US to build these as part of their range.


So many questions...

1) The tires are 16", but how wide are they?
2) Are the tires readily available? (Not custom made)
3) Can you show me a diagram of the 4-pole motor wheel mount so that I can find a proper hub?
4) Was the hub custom made, or an off-the-shelf hub made for another application?
5) Can you show me how the front caster mounts were remade so I can have a machine shop here duplicate the process?

Also, any info you have the new guards would be appreciated.

As for the power module overheating, what does Invacare specify as the maximum operating temperature inside or near the controller? I could rig a simple thermal probe to track the temperature and see if it exceeds the maximum.

As for durability (since this is likely only an early prototype?) I'm betting the acceleration settings on the test chair should be set at minimum until the system is fully tested, to work out the bugs and so as not to encourage the controller to overheat.

Next, the module is rated for 90A. Does that mean the module is rated to supply somewhat less than 90A continuously, and only 90A for a brief period? If so, what is the controller's rated maximum that it can supply continuously?

Next, I'm betting the larger tires place an additional strain on the controller - How do you make sure that the motors pull no more than 90A, or does the controller self-limit this?

Last, do the larger tires increase the ground clearance? If so, how much?

Thanks...


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: Shirley_hkg on August 09, 2009, 04:38:12 am
:D  HERE is a " MUST - SEE " for someone who wants to squeez the last bit of his chair out .  Cheers !  Shirley. :D
.
.

:) http://www.wheelchairdriver.com/power-wheelchair-off-road.htm


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: SweetBearCub on August 09, 2009, 11:19:50 am
Quote from: Shirley_hkg;1872
:D  HERE is a " MUST - SEE " for someone who wants to squeez the last bit of his chair out .  Cheers !  Shirley. :D
.
.

:) http://www.wheelchairdriver.com/power-wheelchair-off-road.htm


Shirley,

Thabk you, but I found that site about a week ago. :-) While I think that this man is very talented, I do not have the resources to basically strip and rebuild my chair from the ground up.. yet. He went so far as to remove the suspension, rework the battery box, use different footrests, and probably other stuff I'm forgetting.

Yesterday I was doing some research and came across the technical details of an older Invacare MWD chair - The Xterra GT. It could climb 2 inch curbs instead of the 3 inch curbs that the TDX series is known for, it had a weight limit of 250 pounds instead of 300, and it used an 80A controller instead of 90A, but.....

Using 4-pole motors, it had a rated top speed of 7.4 MPH, 0.4 MPH faster than a TDX SR. I think the reason for its increased top speed, in addition to a more aggressive controller (MKIV, if memory serves), was that it used 16"x3" drive wheels.

Go figure....

My questions about the modofied Invacare NZ chair still stand. I think that route may be the best way to increase the performance of this chair, considering the expense and difficulty involved in deeper modifications.


Title: The Ram
Post by: DREDD on August 09, 2009, 01:38:08 pm
There's not a lot I can tell you at this stage until the design is perfected.
The tyres are 16x4 and are available in New Zealand. The hub is custom made and I have no drawings of how it's made. Can't show you drawings of the castor mount as it belongs to the guy who designed them, same goes for the guards. I can't give you answers to the questions put forward as even I don't have access to the info. We have to wait for Invacare to release the specs so the U.S can start production. How long that will be is anyones guess. Sorry I can't do more.


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: jakeyboy1 on August 09, 2009, 04:05:01 pm
Oh....the Xterra....  I remember it well.  It actually went 8.5mph!!  It had two things going for it.  High gear ratio and 16" wheels.  It suffered from poor acceleration and very unstable.

You can still buy the 16" wheels that fit the Xterra and they will bolt up to any chair that uses 4pole motors.  I have done it on a rear wheel invacare.  It increases the speed by 1.5mph.  I havn't tried it on a tdx yet.  I'm afraid it would really throw off the suspension, steering and center of balance.


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: SweetBearCub on August 09, 2009, 07:28:21 pm
Quote from: jakeyboy1;1875
Oh....the Xterra....  I remember it well.  It actually went 8.5mph!!  It had two things going for it.  High gear ratio and 16" wheels.  It suffered from poor acceleration and very unstable.

You can still buy the 16" wheels that fit the Xterra and they will bolt up to any chair that uses 4pole motors.  I have done it on a rear wheel invacare.  It increases the speed by 1.5mph.  I havn't tried it on a tdx yet.  I'm afraid it would really throw off the suspension, steering and center of balance.


Jake,

Thanks for your reply.

8.5?! So much for the 7.4 that Invacare quoted... I know a guy here in SF that has one - I raced him, and for the first several feet, I had him beat, but the forward acceleration on my chair is set at 100%, that may have had something to do with it.. LOL

As for buying the Xterra GT wheels (which I think look much snazzier than the TDX wheels) and replacing the TDX wheels with them - How much would the ground clearance increase? From 3.0" to ?? I think if we can answer that, the answer of how the larger wheels will affect the suspension will follow. I'm no engineer (and I suck at math past basic fractions) but as far as I know, increasing the drive wheel diameter by 2" would only increase the ground clearance by a fraction of an inch. How big of a fraction, I do not know.

In fact, wouldn't larger drive wheels actually help the TDX? How many times have you tried to crest an obstacle and been stuck in the position of having the front casters fully elevated, but with the drive wheels making no contact with the ground? I'd think that having larger wheels would make it easier to maintain contact in that situation.

As far as the larger wheels throwing off the suspension, as far as I know, the TDX series suspension articulates up and down 3" in the front for a total of 6", and 1" in the rear, for a total of 2". In theory, having larger wheels that increased ground clearance by 0.4" (totally random guess) would reduce our curb climbing capability by that amount, but the suspension would drop down and compensate, so handling should still be fine. And as a tradeoff to the reduced curb climbing capability (which in my opinion is near worthless anyway...) we would get increased ground clearance, which may help in some situations.

I'm betting that if the Xterra GT's 16"x3" wheels were fitted, with the same solid rubber tires that are on my 14" rims, the front casters would need to be moved forward by a small amount. Not being an engineer, I'm not sure. If they would clear each other (by however small of a margin) in un-modified form, that would be great.

The only way I see the larger wheels compromising the stability of the chair is in getting used to a top speed of 7.3 MPH vs. the old top speed of 5.8 MPH. Plus more on steep downhill grades, of course. If that's all it is, the only trick is in learning how to handle a faster chair.

It seems like the last requirement would be in fabricating new fenders, which should be relatively easy. I'm thinking that the stock fenders would suffice, since the Xterra's wheel is also 3", just that the fender would need to be raised a bit above its original location. I'm sure that could be accomplished with an afternoon at a hardware store.

Oh yes - How do I go about acquiring the Xterra GT wheels and tires?

Am I missing anything?

Thanks....


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: Shirley_hkg on August 10, 2009, 12:11:13 am
;)
Xterra use 3.00 - 10 tires , that means 10" rims.  It will swap out  your 14"  wheels directly ,  if you acquired the rims too.  Shirley. ;)


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: jakeyboy1 on August 10, 2009, 09:37:02 am
The Xterra originally went 8.5mph.  Subsequently, Invacare lowered its speed.

How to get the wheels and tires?  Go to http://www.invacare.com, click on parts catalog, power wheelchair, Xterra, wheels etc.  get the part # and go to a invacare dealer and ask them to order the parts.  Any dealer would be happy to get "cash" business.

Regarding the bigger wheels on a TDXsp.  Going from 14" to 16" wheels would add 1" of ground clearance.  I'm afraid your bigger issue would be the relationship between the drive wheels and the front and rear casters.  The stability lock has such close tolerances I think a 1" movement would render it inoperable.  (meaning stuck in lock position)  By raising the drive wheel 1" you would effectivly be lowering the casters 1".  This would effect the "sure step" it it's downward travel not up.  The simple (maybe) solution would be to switch all 4 casters to 2" bigger to maintain same height.  For example, if the stock casters are 4", replace with 6".  However, if you do this the casters will probably hit the drive wheels, since they would be so big.  
I think the best thing; would be to make 1" lower brackets to attach to the top of the caster forks.  This requires more energy then I am willing to speed right now.  Also, I would want to experiment with this on a "extra" chair.  As I don't have a extra chair, this concept will remain a concept until I have both a extra chiar and more energy...lol

I'm really enjoying this thread....  It makes us all think outside the box


Title: Is the MPJ+ joystick a direct swap for the SPJ+?
Post by: KiwiJenn on August 11, 2009, 10:23:13 pm
The TDX SP RAM has 8" front castors.  When I was at the Show Your Ability Show in February 2008 Invacare had the chair there.  

One of the guys hoped into the TDX SP Ram and I gave him a race in (in my TDX 5 which goes 12km/7,5mph HDTTGB motors) a gym court next door.  The TDX SP Ram basically caught up to my chair so I guess it was slightly faster but we couldn't tell as we needed a longer track.

I was told they were working on getting the big wheels on a TDX SR and imagine what the speed would be then.

I worry about the overheating part though as Sales Reps are always lighter than a wheelchair user most of the time.  Depending on the user weight and what Powered Seating you add to the TDX SP Ram speed will slow down, overheating may become a problem and high settings to enable the TDX SP Ram to overcome obstacles also may cause overheating issues.

I know from experience that high settings and lots of turning does increase and cause over heating and add more weight would be even more problems.

The TDX SP max speed is 10km or just under
The TDX SR maz speed with HDTTGB motors is 12km/7.5mph