Rugby wheelchair Design Velocity Acceleration

1. Effects of Rugby Wheel Chair design on output
velocity and acceleration
Presented by:
A.M.Sheikh
LdSM, UFRGS, 14/11/2012
ahmad.elsheikh@hotmail.com

2. What is the Rugby wheel chair? Vídeo

4. Design Considerations
• Ultra-light as well as extremely strong and
durable
• “The chair is built to the person.” everything is
customised
• The chair: from Al tubing and thickness varies
with the weight of the user (in marathon)
• The chair: baked slowly at a low T after weld.
• Aiming to withstand heavy impacts and be
easily maneuverable.

5. The wheels are covered by spoke protectors to prevent
damage during collisions, and all chairs include an anti-
tip device at the back.

6. Wings are positioned in front of the main wheels to
make the wheelchair more difficult to stop and hold

7. A bumper designed to help strike and hold opponents is
attached to the front of the chairs.

8. Objetivo
To quantify the effect of vertical and
horizontal seat positions, and
wheelchair camber angle on the
wheelchair output velocity and
acceleration moving on static
ergometer.

9. Methods
• Wheelchair frame: [seat height rear (SH),
camber angle (CA) & balance point (BP)]
• Experimental design: 5 trials of the 14m sprint
test were performed for each chair dimension.

11. Methods: Cont´
• Test procedures:
(Torque Tr measured, the acceleration on the court,
random order experiments, and ‘14 m sprint test on
court’ for 6 s)

12. Cycles 2 and 3 of one of the 5 sprint trials for BP+30
Acceleration mean (ax) during pushing phase
Mean velocity (v) during pushing phase

13. Acc. data Velocity data

14. Conclusions
• The different recorded Ns shows according to
configuration.
• Higher velocity was acheived with SH; B+30,
and horizontal position of BP+30.
• The acceleration values for PB-30 lower than B
• CA has no significant effect according to
Velocity and CA-/+2 for acceleration.
• For this athelete, recommended lower CA,
higher SH and forward horizontal position.

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