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FAST!  Click for  BIGGER!BM3 POWERCHAIR
2011 MK3 Version

FORGET THE REST!
WHY?  NO other powerchair does the following:

  • 15 MPH SPEED!
  • 45 + MILES RANGE!
  • SAND, SNOW, & REAL OUTDOOR CAPABILITY!
  • FULLY INDOOR CAPABLE (NARROW & VERY SHORT)
  • 45V SAFE, LITHIUM ION NANO PHOSPHATE BATTERY
  • 3X MORE STORED ENERGY THAN ANY OTHER "HI END" CHAIR
  • 10X FASTER CHARGING THAN THE REST!
  • 15 YEAR BATTERY LIFE!
  • HUGELY POWERFUL 2X 150A / 45V CONTROL SYSTEM!
  • GREATER TORQUE & CONTROL THAN ANY EXISTING CHAIR
  • ULTRA HIGH BUILD QUALITY!
  • IN CAR + AT HOME FAST CHARGE CAPABLE
  • TUBELESS, KEVLAR RE-ENFORCED, TYRES FOR ZERO PUNCTURES!
  • HIGH FLOATATION, LOW PRESSURE TYRES, FOR SMOOTH OUTDOOR RIDE & SOFT GROUND PERFORMANCE
  • WHEELIES & ACCURATE CONTROL & FEEL, LIKE A SPORT MANUAL WHEELCHAIR + MUCH MORE!

More info:      BM3 Home
       BM3 Lithium battery
       BM3 15 MPH
       Charging Lithium
       Construction detail  
       Roboteq controller
       PDF Summary Printable
       
Current version 2010:      BM2 Powerchair
Original version 1998:      BM1 Powerchair  


 

 
 

 
PERFORMANCE AND ABILITY

Rearward C of G means greater control, drive wheels under your backside, wheelies at will, much  like a sports manual wheelchair.

Very low weight over fat 9.5 inch caster tyres. Very easy to turn and manoeuvre indoors compared to "normal" powerchairs.

Ideally suited to an active Paraplegic user that is used to a lightweight sport manual wheelchair that is "tippy" and requires some skill to use.

 

Whilst its very EASY to just bolt a set of wide tyres like these to any powerchair, it will make it some 7 full  inches wider than a stock powerchair!

Doing this while keeping the width down to around 26 inches is very difficult. Which is why you will not find any built by the "real" manufacturers! They haven't figured out how yet!

At home indoors, or out, in snow, sand, or with all terrain tyres in winter also in mud and some off road. And it has the battery power & speed to actually cope unlike existing powerchairs.

This powerchair is narrower, shorter, lighter, faster, tighter with better more "direct" control and has better indoor capability than most commercial indoor only chairs.

But is still capable outdoors as well, on sand, snow, or real world streets. More so than any other hi end power wheelchair including many off road types!  With much greater range and performance and reliability thanks to its huge lightweight lithium battery.

It is also fast charge capable, both in your car as you drive, as well as from the wall. Should you need it, since charging overnight every week is probably all most people will ever need!

 

BUILD QUALITY

It has a hugely better build quality than any mass produced power wheelchair. And a 10 to 20 year expected battery life from its lithium "heart". 

It is built and finished to last. With high quality engineering self aligning "rose joints" used extensively, alloy powder coated spacers and fabricated alloy components.

Stainless steel corrosion proof fasteners, stainless steel axles, stainless steel "food grade" bearings so they do not corrode and fail due to water ingress as do existing powerchairs.

Puncture proof tubeless Kevlar lined low pressure easy riding high floatation soft "balloon style" tyres with huge sidewalls, light alloy aircraft quality drive wheels. To allow for driving in comfort, on sand, pavements etc. Or similar sized tubeless ALL TERRAIN tyres for snow, mud, etc.

Every part is hand finished, show quality powder coated or stainless steel or in the case of the aircraft quality rear wheels, polished alloy.

It also has/uses easy accessible free to download PC software for data logging and programming of the controller. This can on the move via a laptop or net-book. The exact opposite from the impossible to obtain "big brother" controlled wheelchair industry programming tools!

As well as comprehensive battery testing, balancing, charging control software via PC to keep track of and monitor the Lithium battery graphically and in great detail if you wish! I helped develop this charging system and charger. So I know its good! 

 

Everything is designed and fabricated by myself here in a bedroom and put together with HUGE attention to detail and with the best possible parts.

Every single part here in these pictures is either modified to use on a power wheelchair or constructed by hand. And finished to last!

 

See Construction detail & for more detailed build info.

 

Hegar Alloy tubeless rims, with 6 inch wide Kevlar lined puncture proof high floatation smooth riding "soft" low pressure rear tyres for comfort and floatation on sand / snow or soft surfaces shown here.

Its also extremely short by design!  Once the deep single footplate is fitted, it is still under 37 inches long in TOTAL. That's shorter than almost all "indoor only" powerchairs... Never mind the bigger better outdoor ones! /p>

No footplate, or mountings yet fitted here.  It uses another 12 rose joints, and two rubber anti vibration mounts for the seat front edge to provide anti vibration to the central front footplate.

 

Only the best GLOSS show standard hard powder coatings, stainless steel or other non corrodible materials are used on this chair.  

Notice the 12 inch floor tiles. This chair is still narrow even with a full 12 inches of rubber on board!

Very high, short, small anti tip wheels. And 3x the power of any normal hi end powerchair means I will be able to flip myself over the back at will.

The throttle goes both ways however...

This chair is built for myself, to be as agile, as small, as lively, and as manoeuvrable as possible.

Every fraction of an inch makes a huge difference when indoors or inside a van. Without compromising outdoor range, speed, and off road capability. All of which are far better than any other powerchair.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
SPECIFICATION

 


 
  • FAST CHARGE from your car or from the wall with a very advanced charger that can be connected to a PC to graph the charge or control the charger. See Charging Lithium
     
  • BUILT TO LAST and for reliability. As such all bearings, bolts, and axles are stainless steel so no failures or disassembly issues at a later date. No corrosion.  All bolts are polished stainless steel for the same reasons. All metal parts are show quality powder coated for winter protection. All cables and wiring in heavy gauge cable with Anderson connectors.
    • LENGTH 37 INCHES TOTAL INCLUDING all foot riggings. That is shorter than most MANUAL wheelchairs!
       
    • WIDTH: Depends on chosen tyres.  Rivals or beats many indoor only powerchairs @ 25.5  inches with 145/70 - 6 all terrain tyres. Or 26.5 inches with 6.00 x 6 turf tyres as shown (including 20 inch seat cushion)  SEE BELOW!
  • CONTROL SYSTEM: is Roboteq 50v max (47 max in use 45v mostly) and 150 Amps per motor. 250A peak, or 500 Amps total. That's approx 14,000 watts capability.  Or 2.5 times better than ANY mobility controller. And all programming software and data logging software is available free of charge from the Roboteq website. Also includes full Radio Control capability, and very intensive real time graphing and analysing of many motor, battery and controller parameter on a laptop as you drive. See Roboteq controller
  • BATTERIES:   Safe - Lithium Iron Nano Phosphate (78x 12Ah cells) 46.8v total charged battery power for at least 2.5x the range of any "normal" powerchair. And HALF the weight. And with at least 2000+ 80 percent discharge cycles!  That's at least 4x the battery life of existing lead batteries... see BM3 Lithium battery
     
  • GROUND CLEARANCE: 4+ inches. (118mm) Depends on tyres and pressures. Not less that 4 inches.  See images below, seeing is believing!
     
  • WEIGHT: Unknown but much lighter than other "high end" PowerChairs due to battery alone, but also hugely lightened and simplified in other ways too.
     
  • USER WEIGHT:  Estimated 28 stone before any problems. Not critical, plenty of power and strength.
     
  • SEAT HEIGHT:  16 inches at the rear, 17 inches at the front edge. Or less. Plenty of space to lower it. Adjustable for angle. (dump) Any rehab type seating can be fitted, riser, tilt, leg elevators, recline, etc. All add weight, and ruin the perfectly defined C of G position though!
     
  • TORQUE:  Much more than other powerchairs. Due to approx double the voltage and up to 250 Amps peak power per motor. And truly user defined programming with zero delay or "accelerations" designed in. This chair will go and turn and stop when told to do so. Unlike all current mobility offerings.
     
  • SPEED: 15 MPH on private land. Or if your laws allow... Faster than any other mass produced powerchair, without torque or range penalty! With slower 4 MPH or 8 MPH selectable for legal use in public areas.
     
  • FOOTPLATE and seat front edge mounted on vibration reducing rubber blocks to reduce vibration from front caster wheels reaching your feet. Seat/footrest assembly free to move in "pitch" on a pivot under your C of G. Rear low pressure large cross section high floatation tyres form the rear suspension.
  • REAR DRIVE TYRES WINTER:   145/70 - 6  (14.5 inches x 6 inches wide) low pressure tubeless 5 to 8  PSI high floatation for sand, off road, and REAL comfort on the streets! 4 ply, treated with off road puncture treatment. Image
     
  • REAR DRIVE TYRES SUMMER:  Tubeless 15 inch 6.00 x 6 turf tyres with Kevlar anti puncture reinforcement. (Tubeless tyres are approx 20x less prone to puncture deflation and these are reinforced with Kevlar too! Called K shield) image
     
  • FRONT CASTER TYRES:  3.00 x 4 tyres (9.5 inches x 3 inches) Treated with puncture seal. Powerchair can drive safely with a deflated tyre or in fact no caster wheel at all due to rearward C of G position to get you home.
     
  • SEAT WIDTHS:  Adjustable from 14 inches wide up to 26 inches. Above 20 inch wide cushion the chairs width increases beyond the 25.2 inch tyre track width.
     
  • RANGE: Approx 45 miles real world.  Or much more than double that of any normal full sized group 24 battery powered hi-end powerchair.
  • Under 27 inches wide, with 6.00 inch wide tyres as shown. Under 26 inches wide with the all terrain 145/70 - 6 tyres fitted...  

     

    Ground clearance = 4+ inches. Or in fact slightly more than a Coke can!

     

     

     

     

     

     

     

     

     

     

     

     

     

    At both ends. Less clearance than this means it will not work properly in sand, snow outdoors. 

    Almost all other powerchairs have less ground clearance and skinnier tyres than this.

     
     

    WHAT'S THE PURPOSE OF THIS PAGE IF IF I DON'T SELL THESE POWERCHAIRS?

    To embarrass the manufacturers into getting with the show, and doing some real development work. And to show other wheelchair users especially Paraplegics like me, what is actually possible and to show how bad most powerchairs really are. As such there are others now building the "same" or similar, or modifying powerchairs in one way or another. Many are members of my Message board

     

    More info:      BM3 Home
           BM3 Lithium battery
           BM3 15 MPH
           Charging Lithium
           Construction detail  
           Roboteq controller
           PDF Summary Printable
           
    Current version 2010:      BM2 Powerchair
    Original version 1998:      BM1 Powerchair  

     

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