Theatre Design & Technology - Winter 2005 - 25

FIGURE 12. FLOW METER

FIGURE 13. ROVER ON VERTICAL HOSE SECTION
(from video)

FIGURE 14. THE GAUNTLET

cage. For a moment nothing happened-then it began to
move! With a Nora Desmond sort of grace, Rover moved down
the length of the hose and then back again. Back and forth,
back and forth. I must have run Rover a hundred times that afternoon. After months of defeats we had finally succeeded It
was still a little tricky to find the "sweet spot" between squeezing the hose too much and too little, but once it was located,
Rover behaved consistently. The stiffer rollers had done the
trick.
Timing dozens of runs up and down the hose returned a
speed of one foot per second, or roughly half the speed we anticipated, but with no perceptible variation between runs. Either we were loosing fluid somewhere (now considered
unlikely) or we had miscalculated something. The new flow
meter confirmed that the pump was producing around 15
gpm, and the pressure gauge indicated the requisite 400 psi,
so the only possible variable was the area of the hose. I
marked the hose on each side where it was pinched the tightest between the rollers and then traced from there along the
face of the rollers where they impinged on the hose (fig. 10).
When pinched flat, the hose measured 2d˝ across. The tracings I made on the hose revealed a folded ellipse the width of
the hose on one axis and 3˝ on the other axis (12˝ per side).
24

W I N T E R

2 0 0 5

TD & T

This was nearly a circle. Too anxious to work out the area of
an ellipse mathematically, I drew it in AutoCAD and simply
measured the area. The result was 6.77 square inches-not
the 1.76 square inch cross section of the hose! Now the calculation looked like this:
V = 0.3208Q ÷ A
V = 0.3208 (15) ÷ 6.77
V = 0.71 feet per second
This was much closer to what we were getting from the
system than our original calculation, but our measured times
were somewhat faster. The discrepancy between our measured
results and the calculation above may be accounted for in the
half inch or so of the hose that is pinched flat and not exposed
to fluid pressure. While the speed we could achieve with the
system was a disappointment, at least the picture now made
sense mathematically. And what we gave up in speed we gained
in force:
F = PA
F = 400(6.77)
F = 2708 pounds of force
Even with frictional losses, we could at least expect a ton of
force moving Rover along.



Table of Contents for the Digital Edition of Theatre Design & Technology - Winter 2005

Contents
Theatre Design & Technology - Winter 2005 - 1
Theatre Design & Technology - Winter 2005 - 2
Theatre Design & Technology - Winter 2005 - 3
Theatre Design & Technology - Winter 2005 - Contents
Theatre Design & Technology - Winter 2005 - 5
Theatre Design & Technology - Winter 2005 - 6
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