# Air Teaser

### By Ernie Parker

AI, AJPP, AJPPCC, S, MT, MM, MIH, MIP, MMH

These teasers are printed in the Fluid Power Journal. Think you know the answer? Submit by e-mail to jhoffman@ifps.org. Those who submit the correct answers before the deadline will have their names printed in the Society Page newsletter and in Fluid Power Journal. The winners will also be entered into a drawing for a special gift.

## Problem: Number of Cycles

“I plan to put an eight (8)-ft. elevator in my house using an air-over-oil system in case of power outages. My air compressor has a 75-gallon tank and kicks …

## Problem: Cost of Air Leaks

We often hear that the cost of air in a manufacturing facility is approximately 40% of a utility bill.  Obviously this will vary considerably for different …

## Problem: Cylinder Extension

Given: Cylinder is 4″ x 20″ x 2″ Operating pressure is 100 psi No load on cylinder This cylinder is extending at a rate of 5 inches per …

## Problem: Vacuum Regulators

I maintain a mobile medical unit (hospital), which is a large semi-truck that opens up to over 1,000 square feet for emergency medical usage. Along with all …

## Problem: Building Anchor

This question varies a bit from the normal Air Teaser, however it still uses some of the same formulas that are used to determine a force to overcome motion. …

## Problem: Vehicle Rod Sizing

In designing a vehicle to go down the road at 60 mph, one must know the drawbar pull of the vehicle. This is a combination of drag coefficient, rolling …

## Problem: Standard Size Cylinder 3

Deadline past. Not available for submissions. Winner: Robert Justin Allison, CFPS, Butler, PA, Rotork Hiller Answered Correctly: George Fling, CFPS, Dallas, …

## Problem: Necessary Pressure

If the rotary actuator has four 4″ diameter cylinders as shown, what would be the necessary pressure to rotate the shaft with a torque of 5000 lb. in.? …

## Problem: Size an Air Compressor and Receiver

A company has a machine that uses 50 cfm at 100 psi. Size an air compressor in SCFM that will have a duty cycle of 40%. Then size an air receiver in gallons …