FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1923
1923 - 0388.PDF
JULY 12, 1923 PAPERS AT THE INTERNATIONAL AIR CONGRESS THE SLOTTED WING By F. Handley Page THE first part of Mr. Handley Page's paper dealt with the general principle of the slotted "wing, and with results obtained with the older form of slot, formed by a thick auxiliary aerofoil. He then referred to a later development, in which •'": •* Nty ft,/* y &/*/«! /7"C5 ry fltnj < o/flw —. iiliary Henfoil —- -, the auxiliary aerofoil is of the single-surface type. As this has the advantage of affecting, when closed, the resistance, to a smaller extent, his remarks are quoted as follows : '0 « 8 7 5 •-+ ^ c / / 5 PHI liSscfmr, ^,fh jr'jnt Slot a"J Shtltd [Uf> Flufa cinylc * ?0 Q-Fror\t Hot only //~^ I?*) f is Set** flnspcid 35/tct/fMrJs** Model 36 * 6 On sloped 36 • 6i<? 5/ofFt-d Coc/f'C'Cr'li ColcvlatiM On -1 - <^, 6 Chord ••'.'.,'')' ' ' • ' . •' '., /o /5 ^o' V;,^-;•..;: " Considerable wind-tunnel work on the best form of slotand auxiliary aerofoil has been carried out. It has now been found that the single surface type of auxiliary aerofoil givesa result equal to, and in some cases better than, one that would be termed a thick section (Fig. 4). " Firstly, it has the advantage that with the slot-closedcondition the true basic section is retained, so that no increase in drag is brought about. " Secondly, it obviates the tail adjustment that is necessarjr with the swivelling form of slot (Fig. 5), due to the backward movement of the centre of pressure on opening the slot, a C.P. movement that has also to be compensated for on planes fitted with flaps. This is practically negligible with the single surface type of aerofoil, as the forward movement of the auxiliary aerofoil practically compensates for the backward movement of the centre of pressure." By applying the single-surface auxiliary aerofoil and slotted flaps to R.A.F. 15 section very good results have been obtained, as shown in Figs. 14 and 15. The section is shown in Fig. 16. . Continuing, the lecturer said : " Tests on various Sections show that a definite increase can be expected, these being approximately in the order of :—• Thin Sections.—50 per cent, for front slot, and 40 per cent, for slotted flap. Medium Sections.—40 per cent, for front slot, and 30 per cent, for slotted flaps. Thick Sections.—35 per cent, for front slot, and 25 per cent, for slotted flap. " Dealing with thin or high-speed sections—R. A.F./15 being taken as an example—the latter tests show that the front IB Ib 14 12 10 08 1 •04 7t * h IS St*/«m I ^'hjrenrSlorand S'ofTcd Af 1 \ / y ..[ / frtnfSlatonly f Cotf/iCKnli Cti/cvUUcJ on a b Choral - - ;:' ':&•• --,: 5 'O /5 ^O * •-••» '---- "1,^-V; ./.:; «<• fnuance ~ ._.Z •-,- 'I'MMk: Fie.15. ^r:J^% 388
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
