REFLECTOR: Brake performance

[Velocity]

I modified my Brake caliper form 1.25 Dia to 1.5 dia pucks . I also 
checked to see I was getting 450 psi out of my master cylinders and I am 
still yet to be able to lock the Wheels.
Matco said I should have more than enough to lock the wheels I tend to 
think there is some fussy math going on here. I feel I have plenty of 
stopping power right now but like engine HP there is never enough power 
and I would really like to be able to lock the wheels in  a pinch.

Ron


On 3/16/2013 10:26 AM, Brian Michalk wrote:
> I just looked up the Matco specifications for the WHLW600XTE
> http://www.matcomfg.com/WHLBRKASSY600X6TRPLeXtraTorqueEnergy-idv-3801-4.html
>
> I don't know how the number match dimensionally, but I assume a 6.00-6 
> wheel has a six inch radius?
>
> Assuming the wheel above, a 5/8 bore master cylinder and their specs of:
> Static Capacity 	1860 LBS
> Load Limit 	5580 LBS
> Maximum Accelerate/Stop Kinetic Energy 	450500 ft-lb
> Torque Rating (@450 PSI) 	6441 in-lb
>
>
> For 450 PSI, I would need to press on the master cylinder a force of 
> 138lbf, which I am certainly capable of, and feel that I can generate 
> this much force without too much effort.  There is perhaps a 3X 
> mechanical advantage in the pedal arrangement.
>
> Their torque rating, with the wheel above shows that it could provide 
> 1074lbf to a wheel weighted to approximately 750lbf. Horizontal force 
> is higher than vertical force, indicating a friction number greater 
> than 1.0 is needed.
>
> This tells me that with very little effort, one should be able to lock 
> up the wheels while taxiing in their airplane.  I have the original 
> brakes, the W600XT, which have identical torque performance, but 
> different kinetic energy numbers.  I don't need higher energy, I want 
> better torque.  I do not think I am getting the performance indicated 
> in these specifications.  Is my math wrong?
>
>
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