FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1921
1921 - 0131.PDF
FBBRUARY 24, IQ2I slot, the width of the two openings and the position of the forward small aerofoil, and many other details, were found to have a very marked effect upon the results. Fig. 6 shows some early type slots on an R.A.F./6 section, and Fig. 7 the results obtained. The lift coefficient increases about 25 per cent, with the slot opened. Further develop- ments are shown in Fig. 8, where a simple single slot is formed by the swivelling front edge on aerofoil No. 32, which was approximately of R.A.F. 6 cross section. This aerofoil was tested at the National Physical Laboratory at a speed Top diagram shows R.A.F. 6 section with early typeslot. Lower diagram shows same section with later type slot of 80 feet per second, and the results are shown in Figs. 9 and 10. The maximum lift coefficient of the plane with the slot closed was .633 and with the slot open .943, an increase of 50 per cent. The maximum value of the lift/drag co- efficient was 16.6 and 14.1 respectively. These results have also been plotted in Fig. 10, on curves showing the relation between speed and horse-power per lb. weight, according to the method described in a Paper which I read before the Aeronautical Society in February, 1917. (Published in FLIGHT, February 15, 1917.—ED.) Speed is plotted as —7 — , and horse-power per lb. weight as K»/Kj,f- With the slot open there is a reduction in landing speed of about 20 per cent., and with the slot closed practically all the advantages of the ordinary section. -13 3 Slotted aerofoil No. 32. Slot open and slot closed J >ft K> « •/ V § / 1 1 • FIG. IO. 131
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
