NASA-TN-D-405
Investigation of tandem-wheel and air-jet arrangements for improving braking friction on wet surfaces
Year: 1960
Abstract: In an attempt to improve tire braking characteristics on wet surfaces at high speeds, preliminary tests were made on a tire treadmill to determine the effectiveness of two methods of clearing away water ahead of a braking wheel. One method consisted of mounting a free-rolling or idling wheel ahead of a braking wheel, and the other method consisted of directing an air jet on the water-covered surface ahead of a braking wheel. Tests were made with smooth and diamond-treaded 3.00 X 7 tires (about 12 inches in diameter) on the braking wheel and a smooth 3.00 X 7 tire on the idling wheel. In the blowing tests, two nozzles having different diameters were used with air-jet pressures up to about 100 pounds per square inch. Measurements of tire friction coefficients were made with 0.09 inch of water on the belt of the treadmill over a range of speeds from 26 to 93 feet per second.
Subject: AIR JETS
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contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
date accessioned | 2017-09-04T16:16:16Z | |
date available | 2017-09-04T16:16:16Z | |
date copyright | 01/01/1960 | |
date issued | 1960 | |
identifier other | SZHOEEAAAAAAAAAA.pdf | |
identifier uri | http://yse.yabesh.ir/std/handle/yse/79555 | |
description abstract | In an attempt to improve tire braking characteristics on wet surfaces at high speeds, preliminary tests were made on a tire treadmill to determine the effectiveness of two methods of clearing away water ahead of a braking wheel. One method consisted of mounting a free-rolling or idling wheel ahead of a braking wheel, and the other method consisted of directing an air jet on the water-covered surface ahead of a braking wheel. Tests were made with smooth and diamond-treaded 3.00 X 7 tires (about 12 inches in diameter) on the braking wheel and a smooth 3.00 X 7 tire on the idling wheel. In the blowing tests, two nozzles having different diameters were used with air-jet pressures up to about 100 pounds per square inch. Measurements of tire friction coefficients were made with 0.09 inch of water on the belt of the treadmill over a range of speeds from 26 to 93 feet per second. | |
language | English | |
title | NASA-TN-D-405 | num |
title | Investigation of tandem-wheel and air-jet arrangements for improving braking friction on wet surfaces | en |
type | standard | |
page | 21 | |
status | Active | |
tree | NASA - National Aeronautics and Space Administration (NASA):;1960 | |
contenttype | fulltext | |
subject keywords | AIR JETS | |
subject keywords | AIRCRAFT BRAKES | |
subject keywords | AIRCRAFT TIRES | |
subject keywords | BRAKING | |
subject keywords | COEFFICIENT OF FRICTION | |
subject keywords | HIGH SPEED | |
subject keywords | IDLERS | |
subject keywords | LANDING GEAR | |
subject keywords | NOZZLE GEOMETRY | |
subject keywords | RUNWAY CONDITIONS | |
subject keywords | SLIDING FRICTION | |
subject keywords | SURFACE PROPERTIES | |
subject keywords | WATER | |
subject keywords | WETTING | |
subject keywords | WHEEL BRAKES |