Accession Number:

AD0706679

Title:

AIRCRAFT BRAKING FRICTION TRIALS ON A COARSE OPEN GRADED MACADAM RUNWAY SURFACE.

Descriptive Note:

Technical rept.,

Corporate Author:

ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)

Personal Author(s):

Report Date:

1969-06-01

Pagination or Media Count:

59.0

Abstract:

Accelerate-brake trials were made on a coarse open graded macadam runway surface, with a Scimitar Mk.1 aircraft to measure braking friction in wet conditions. For comparison, trials were also made on grooved and ungrooved asphalt surfaces. The grooving was shallow and transverse to the runway. The braking was initially found to be limited by the available brake torque and the performance of the maxaret anti-skid system but was subsequently improved by increasing the brake pressure and modifying the maxarets in order to develop the available tirerunway friction. Although the aircraft had to be given up before the planned test program was completed, a tentative assessment of the surfaces was made from the seven trials carried out. These indicated that the open graded surface realized somewhat higher wet braking force coefficients than either of the other two surfaces, that the wet open graded surface was almost as good as the dry grooved asphalt, and that the grooved surface was no better in wet conditions than the ungrooved. Moreover, the trials showed the necessity of using a test vehicle with a high braking performance and the desirability of nosewheel steering. Author

Subject Categories:

  • Terminal Flight Facilities

Distribution Statement:

APPROVED FOR PUBLIC RELEASE