The Aeroplane Spotter, April 9th 1942

2 ? ; V 2 1 1 1 111 I Span i S in g le E n p in e d F ig h t e r s . m t t h .)r 5-3 2 ill lU J -L Length J 30' 1 “ 5 2.0 5P , T " ~V l f I 10 10 3 0 »io543 2 1 1 U _Li_l---- 1 ---- ----------J 4 5 L y s o n d e r Harvard F u l m a r S k u a T o 8 7 M s . 1 2 6 I1L t L L 35 05 8 f'O ?4 3 2 U __ L - L J ____ L 1 55 Beti/e B l e n h e i m O r? son O x fo r d m e . H O F W . 1 8 7 J u . 8 8 D o . 2 1 5 * > 1 0 54 3 2 1 .1 li l i ... 1 I 40 6 ’ & io 5 4 3 I 1 l 1_L. a _L _ _ • H a m p d e n H e. l l i 75 J o . 3 6 D o . 1 8 to L J* 3 I 1 , 1 - 2 J 60 2 o io S43 _ U ____I . i 2 -i_ 1 Q C W e/Jinoton O ^ H a t r o u t L e r w i c k s i U _ _ _ L l_j ----------i_ 1 J 65 f » 10 J - i - J — L- 3 -L- 2 i. 105 . L i b e r o t o r | F o r t r e s s C o taJ/rta S u n d e r/a n d . D / s t a n c e l 2 3 4 5 10 20 F le v a t ton •9 1-8 2-7 3-6 4-5 9 IS < b Q ° 45* •7 1*4 2 1 2 B 3-5 7 14 30° •5 10 1*5 2 0 2 5 5 10 S t ir lin g C o n d o r D o. 2 6 J u . 5 2 Ju. 9 0 2 0 1 0 _L_1_ $4-3 -L-i-— L_ 10 I___ 9 ° _ i ______ 8 -JL a J 75 7* -J_ _ 6 ° — L — 5 1 3 ° — L_ 2 — L 1 1 A R E A D Y RECKO NER— (Fig. \ ) — The scales shown above should be used as a means of checking the height of aeroplanes when no special height-finding instruments are available. The scales, which should preferably be mounted on transparent material, refer to the six mam sizes of aeroplanes and the “ span ’ scales should be used when the aeroplane is passing vertically overhead and the “ length scales when the aeroplane is passing approximately broadside on. The scale must be held at arm s length, that is about 24 ins. from the eye, and in this position the apparent span or length of the aeroplane, placed along the appropriate scale from the left-hand end, will extend to the number marked, which gives the distance that the aeroplane is away in thousands of feel. In the case of those vertically overhead this is, of course. the height• For aeroplanes at other angles of elevation the inset tahles must be used. The vertical and horizontal scale on the right-hand side arc for use in estimating angles, the angles marked being correct to 24 ins. from the eye. / *
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