THE AEROPLANE SPOTTER 96 APRIL 9,1942 L AMERICAN GLIDERS.— The Schweizer S G S 2-8 two-seat trainer glider of the U.S. Army. It has a span of 52//., a loaded weight of 860 lb. and awing loading of 4 lb. per square foot. MORE AIRCRAFT COMPARISONS- By J. G.M. Miller ''T'HE ACCOMPANYING CHART shows some of the newer and A also less common types of aeroplanes, which can easily be confused in certain views. The silhouettes of each pair should be compared, and in some instances marked differences in the outline will be visible at once yet experience shows that these machines would appear very similar if seen flying at more than 3,000 it. Very often an aeroplane is first seen in the most difficult view and cannot be identified until it is seen from a different angle. But if it is correctly identified in the first instance, all the more credit to the observer. The shape of individual parts of aircraft must be learned because sometimes only one prominent recognition feature can be seen. Tlie individual shapes should be compared with the other types to which they bear a resemblance. When the comparison is made the features invisible the different views should be borne in mind. They areas follows:— Head O k .—Number, shape and position of motors, wing position, dihedral, and type of undercarriage, and, in biplanes, the number ol interplane struts and the wing extension. P lan.—N um ber and shape of motors, shape of wings and tips, shape of tailplane, and, in biplanes, stagger and sweepback. —Number and shape of engines, shape of fuselage, shape of fins and rudders and type of undercarriage, and, in biplanes, stagger. For the purposes of comparison, aeroplanes fall into two classes:— (i) Those which are very similar and whose silhouettes should be compared before taking a test, such as the head-on views of the Kittyhawk and Tomahawk. (ii) Those which are not alike in silhouette but which bear a resemblance to one another when flying at more than 3,000 ft. For example, the three-quarter rear view of Hurricane anti Master L When comparing silhouettes there is an unfortunate tendency to look for small points of difference, which are never used in practice as they cannot be seen, or which are not a constant feature of the aircraft. TYPE OF AIRCRAFT VIEW IN WHICH CONFUSION MAY EXIST RECOGNITION FEATURES WHICH WHICH SHOULD BE COMPARED Battle---\ Hurricane--j Plan Length of nose, wingspan and shape of tailplane. Henley ---\Hurricane Plan Shape of centre section. Kittyhawk --1 Tomahawk --/Plan Width of nose. Boston II -1 Boston III-- i Plan Length of nacelles protruding behind trailing edges. Manchester -Whitley ---/Plan Shape of centre section and tailplane. Halifax-- A Manchester -•/Side Shape of fins and rudders. Halifax-- ju 90 ---J Plan Shape of centre section and amount of taper on wings. Lockheed 10 Lockheed 12 ••Plan Side Depth of chord and shape of tailplane. Shape of fins and rudders. Lockheed Hudson\ Lockheed Ventura/ Plan Shape of trailing edges of wings. Leopard Moth Hues Moth -•/Plan Side Degree of taper on wings. Construction of undercarriage legs. Burmuda ---1 Chesapeake --/Plan Shape of tailplane. Ensign --Fokker F.XXII -/Plan Shape of tallplane. Aldon - • Mentor-•-J Plan Shape of tailplane. Simoun - - HenjJy Heck Plan Degree of taper on leading edge ol wings and shape of tailplane. Fairchild 24W -T Voyager-Plan Shape of tailplane. THE BACK ISSUE EXCHANGE STEADY progress is being made in the exchange of all issues, although there is some delay if any of issues 2,3 and 4 are involved, and with the sale of issues 18 onwards. Copies supplied are guaranteed to be complete and readable only. The conditions of exchange and sale remain as published in The A roe plane Spotter of Jan. 29 but it should be noted that only issues in the group 1-17 will be accepted in exchange for others in this group, whilst any issues will be accepted in exchange for 18 onwards. Copies of issues 1-17 are urgently needed and will be bought price 3d. each. Copies of issues 18 onwards will also be bought, but as the supply exceeds the demand at present, only d. each can be paid for them. All correspondence and copies should be sent to P.T. Sampson, So, Fairlop Road, London, £.11. ANSWERS TO DO YOU K N 0 W 7 -XXVIII Among a large number o l highly cred ita b c entries for the "I)o You Know 'control there were no completely accurate Mentions. The best solution came fromM r.D. G odfrey. clo !y*e fol lowed by Mr. J.R .Palm e rand Mr. J . K .BIlling worth. W o are sending the first copy of the new publication **Aircraft Identification —British Monoplanes** to Mr. G odfrey as boon tia* is publish dine a week o r two’s time .The correct answers areas follow :—1. N e ste ro ff in a N :eu p o rt, followed shortly afterward s by P egoud in a BIS rio t—on 1,1013 .Man fred von Rich tho fen ,the German fighter p ilo t, who scored 8 0 victo rie s.R en4 F o n ck. the French pilot, scored 7 5 ,and rhe British pilot. Major Edward Man nock, 75. A Brazilian pioneer of both airship sand aeroplanes. H dido most o f his work in France. 4.540.08 m p.li, 5. Swallow: B ritis hAir craft,S h o rt, Sopwith and others. Buffalo :Brewster. A v ro and Sop with .6. A whole series of C apron i types, such as the L.B .4 ,Ca 8 0 ,etc. 7. Santos D u mont 14 ob.? 8.72 ,inc lu ding crews o f the NC-4. Vim y.R -54 ,Douglas Cruisers and Z R 9.-4. A n experimental Sop with Camel with 320 h.p. A .B.C. Dragon fly I m o tor, which first flew late in 1917 and hod a max. speed of about 165 m.p.h. 10. la)P a rn Pall oston) of 1923 .(b) Sop with Torpedo Seaplane o f 1913.11. (aj Cody, (b) Handle y Pase, (c)S im m onds Sparta n,(d) Aircraft Man ufa c turing Co. fde H a v itla n d D .ll.6 R<»y»!),(e) Aircraft F a c tory ,RE .8,(0 Reid Sand ig ris t, Igl F o k k e rF. V I I (h)F o k k er. (i) Sop with and A roe Research. „12.50 hours 2 6 minutes— B odeckcr and Z ander (German y), Dee. 9-11. iy 3 8 .SOLUTION TO LAST FORTNIGHTS CROSSWORD Clues Across.—1, Lib era tor. 7, Eden. 9, Grenade. 1 0 .D.R .11 ,Rescue. 1 3 ,True .16, lia s .16 ,Nee. 1 8 ,Oils. 1 9 .Intact. 2 2 ,No. ,32 loG ste r. 2 4 .Seal. *25 .WT esUands. Clues Down.—1. Lightning .2, B reguet. 5 ,Rear. 4 ,Add er. 5 .Tees. 6. On. 8, Pressures. 30. Dual. 12, C hilton .17 ,Eclat. 2 0 ,Ages. 21, Toll. 24. 8Ew IVIIERE AND WHAT ?—Two wore posers to test detailed knowledge. Last fortnights problems were (left) the dorsal armament ono Short Sunderland /,looking aft (right) the dorsal armament on a Douglas Boston II. Printed In RmtlsTi'i and pnbiiilir<l Port-nightly by the Proprietors THMPLK. 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