The effect of the ground on a helicopter rotor in forward flight

Show simple item record I. C. Cheeseman en_US W. E. Bennett en_US 2014-10-21T15:54:14Z 2014-10-21T15:54:14Z 1955 en_US
dc.identifier.other ARC/R&M-3021 en_US
dc.description.abstract An approximate method of estimating the effect of the ground on the lift of a rotor at any forward speed is described. Flight tests on several different helicopters show reasonable agreement with the theory. Curves are given showing the relation between thrust, height, speed and power. The theory has been extended to include the effect of a variation in blade loading coefficient and shows that, within the range that this parameter takes on present single-rotor helicopters, the effect is small. The effect of fitting flat surfaces beneath the rotor is also considered and it is shown that the ratio of the thrust in the ground cushion to the thrust clear of the ground, at constant power, is greater for the winged helicopter, but that for the salne rotor operating at constant power, the clean helicopter will have the higher net thrust for speeds less than the stalling speeds of the attached surfaces. en_US
dc.relation.ispartofseries Aeronautical Research Council Reports & Memoranda en_US
dc.title The effect of the ground on a helicopter rotor in forward flight en_US

Files in this item

This item appears in the following Collection(s)

Show simple item record



My Account