. Bulletin. Natural history; Natural history. September 1985 125 Years of Biological Research 311 290 n""" Ti â¢- â -^290 0. ' t\1'' 1 â -4' B. '^^^ \l 300 8 290 oA r:^)j- â4 ^T'^ â ^^0 1 1 ^ 1 y* ^j'W C, L.^1 \. Path of tracking vehicle 1 5 Km Minutes after takeoff Altitude (Meters) for rate of ascent: M/Sec M/Sec M/Sec . 5 198 168 24 5 ^ 10 396 336 486 A 13 515 437 652 D 18 713 605 875 o 21 832 706 1020 A 20 1030 874 1264 S 33 1307 1109 1604 â 4 3 1703 1445 2090 Fig. 6. - Computer simulated paths of a hypothetical bird ascending (at dif
. Bulletin. Natural history; Natural history. September 1985 125 Years of Biological Research 311 290 n""" Ti â¢- â -^290 0. ' t\1'' 1 â -4' B. '^^^ \l 300 8 290 oA r:^)j- â4 ^T'^ â ^^0 1 1 ^ 1 y* ^j'W C, L.^1 \. Path of tracking vehicle 1 5 Km Minutes after takeoff Altitude (Meters) for rate of ascent: M/Sec M/Sec M/Sec . 5 198 168 24 5 ^ 10 396 336 486 A 13 515 437 652 D 18 713 605 875 o 21 832 706 1020 A 20 1030 874 1264 S 33 1307 1109 1604 â 4 3 1703 1445 2090 Fig. 6. - Computer simulated paths of a hypothetical bird ascending (at different rates, airspeeds, and headings), through winds aloft measured during the departure of Swainson's 6905 on 25 May (Fig. 5). Time-bearing data from the tracking vehicle and the route of the tracking vehicle are also shown. The central paths, in 6A, 6B, and 6C have the same 290° heading, m/s airspeed, and m/s ascent rate and thus are drawn identically. They nominally fit the observed time-bearing data. Alternate paths illustrate the effects of other values of these parameters. Arrows are bearings taken from the tracking vehicle. All times are in minutes after the bird took off North is up. The take-off point and the position shown for minute 21 are the first two points plotted in the overall track of Fig. 5. changed by 90° or more (Fig. 5). A sim- ulation during this period would appear similar to Fig. 6 turned upside down, but the data during this period were sufficient only to indicate that the descent was more rapid than the prior ascent. It is interesting to examine the op- tions open to Swainson's 6905 on a head- ing of 290° at an airspeed of m/s. Courses and ground speeds were calcu- lated for the winds measured at alti- tudes reached by the bird (Table 2). These are the same as those used in the simulated plot of Fig. 6, but without the smoothing effect of interpolation of winds, which would cause Tkble 4 to be several pages long. Except f
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
