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Aviation History
1917
1917 - 0213.PDF
MARCH I, 1917. In the expression (9) of the duration of the climb, thesecond factor of the product decreases when the maximum altitude increases. But the first term —-,, which can be written: + a VKAT I Os •*" s2 increases with S. There will be then, generally speaking, a minimum of the duration of ascent for a value of S smaller than that which corresponds to the maximum of the altitude attained at the summit of the trajectory. The results confirm by a more precise deduction those represented by Fig. 5 (articles of September, 1914), without taking account of the variation in weight. If the weight variation accruing from the increase of the surface is intro- duced, the curves of Fig. 5 must be modified. TT It has been assumed that for S infinite ™ = t + In reality. |;= H u/S o when S increases indefinitely. The equations set forth above show, then, that , o for . — or for S ^ Nl « for " - * = W + a; b Kooi For S = 00 and the curves of Fig. (5) become as shown below: Replacing, in expression (9), the speed V» by the speeds VM, VO, V,, corresponding to the vertical speeds of ascent NM, NO, N! at sea-level, we obtain the duration of ascent corresponding to these speeds, that is to say these speeds themselves. The maximum of each of the curves of Fig. (3) is then generally attained for a value of S smaller than S must consequently remain situated Jaetween the value it possesses for Nx •= o and _wK x JThis limit will give, when the result found is compatible with constructional exigencies, the best wing Surface for the aeroplane, for the given conditions. AIRCRAFT WORK AT THE FRONT. OFFICIAL INFORMATION. British. War Office, February 25th. " Mesopotamia.—During the past few days two enemy aeroplanes have been shot down." General Headquarters, February 26th. " In the course of air fighting yesterday one German aeroplane was destroyed, and one other hostile machine driven down damaged." War Office, February 26th. " Mesopotamia.—Throughout the fighting (at Sanni-i-yat), our aeroplane squadrons have co-operated with invaluable results, freely using bombs and machine guns from minimum altitudes." War Office, February 27th. " Mesopotamia.—Later in the evening the Turks began to tow their bridge up stream from Bagilan, but the steamer slipped its tow on being bombed by our aeroplanes, and the pontoons floated down stream some distance." French. Paris, February 20th. " A German aeroplane was brought down by our anti- aircraft guns south of Cernay." Parts, February 22nd. " Sahnica.—Our aviators were everywhere very active, and fought several successful engagements. They dropped bombs successfully on enemy columns near Seres and on Melkuk." Paris, February 2$th. " One of our squadrons effectively bombarded the railway stations af Grandpre and of Romagae-sous-Montfaucon." Paris, February 26th. " During yesterday our pilots brought down three German aeroplanes. One of these machines fell in our lines near Mersy (region of Rheims), the second south of Pinon (Aisne), and the third south-east of Altkirch. Our bombarding squadrons dropped numerous projectiles on bivouacs and a munition depot near Spincourt, where a number of explosions were heard, as well as on the aviation ground and hangars at Buzency, the railway at Ars-sur-Moselle, and the stations of Boussewiller and Woelfling (region of Wissembourg)." Russian. Petrograd, February 20th."In the region of Smorgon on Feb. 18th and 19th our pilots had a number of successful aerial engagements withthe enemy. One of our aeroplanes, piloted by Sub-Lieut. Tamson, had a desperate combat with two enemy machines,and forced both to return to their position." Petrograd, February 23rd. " In the region of Shelvoff (24 miles west of Lutsk) a hostile machine attacked one of our aeroplanes, which was directed by Pilot Sub-Lieut. Svatogoroff. The latter turned his machine round with a sharp movement and fired upon his assailant at close quarters. The enemy machine planed and finally fell into the opposing lines north-west of Shelvoff." Petrograd, February 2$th. " In the region south-east of Baranovichi an enemy aero- plane, which was subjected to our rifle and machine-gun fire, turned over several times in the air and fell into the enemy's lines." Petrograd, February zjth. " Our pilot, Sub-Lieutenant Efimoff, three times entered into combat with a German machine, which appeared over the town of Dvinsk. He compelled it to descend into the German lines." Italian. Rome, February 21st. " Last night one of our airships successfully bombed some enemy billeting areas north-east of Comeno (Carso), causing the outbreak of big fires. In spite of heavy fire from hostile anti-aircraft batteries, she returned safely." Rome, February 2$th. " The weather was favourable to aerial activity. Our aviators, supported by artillery, put« to flight the hostile aeroplanes." * German. Berlin, February 25th. " During the night of the 2jrd-24th a French airship was brought down in flames in the wood east of Saaralben by our anti-aircraft fire. When it touched the ground the ammuni- tion exploded. The crew, numbering fourteen, were killed." Berlin, February 26th. " Yesterday in numerous aerial engagements the enemy lost eight aeroplanes, two of which belonged to an air squadron, which dropped bombs unsuccessfully in the Saar region." Austrian. Vienna, February 20th. " One of our airmen shot down a Russian aeroplane." Bulgarian. Sofia, February 21st. " An enemy aeroplane unsuccessfully dropped bombs on the station of Oktchylar." Turkish. Constantinople, February 20th. " On the Sinai front, on Feb. 5th (? 15th), an enemy aero- plane was compelled to land behind our positions. The enemy machine was burnt, but its pilot was made prisoner. There has been no event of importance on the other fronts." 213
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