Gary Wolf wrote:

Norm,
   An oil pump seems at first to be an easy choice

to absorb horsepower but

there is a problem in that the temperature

determines the viscosity of the

oil. Water remains the same until it boils. The

problem with both is to

convert the output into a measure of horsepower.
   A water dyno has an impeller like a pump but

the housing is ribbed

internally so that the rotational force is

transmitted to the housing. The

dyno is supported in bearings on its shaft and the

housing would like to

rotate when water is introduced into the housing,

but this rotation is

restrained by an arm thet bears onto a glorified

bathroom scale. The length

of the arm x the force measured on the scale gives

the torque. The rpm is

measured from the shaft.
   You could use oil instead of water in this

absorption unit but it would

be difficult to get a stable reading if the

temperature were rising. I have

seen inexpensive go-kart dynos that use oil but

they have a circulating pump

and rad, and even then don't work as well as a

water unit.

             Gary Wolf

Why would you even consider using a flammible fluid
for an energy absorbing device, when water works just
fine.
I also vote with Paul - if you are checking out a
redrive, a prop makes the most sense- Vance

 
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