. Animal flight; a record of observation . Fig. 61. Outline of a vulture slow flex-gliding(8 metres per second). tally. Their resultant may be called the total is a force acting upwards and forwards. It balancesa force compounded of the weight and the force, which acts downwards and backwards, maybe called the total ? - —? f Fig. 62. drag. If a bird is tak-ing energy from theair in soaring flight it is being Subjected Outline of a vulture flex-gliding at medium to a propelling force. sPeed (I2 metres Per second)- Therefore the forces acting on it may be regarded asresulting i
. Animal flight; a record of observation . Fig. 61. Outline of a vulture slow flex-gliding(8 metres per second). tally. Their resultant may be called the total is a force acting upwards and forwards. It balancesa force compounded of the weight and the force, which acts downwards and backwards, maybe called the total ? - —? f Fig. 62. drag. If a bird is tak-ing energy from theair in soaring flight it is being Subjected Outline of a vulture flex-gliding at medium to a propelling force. sPeed (I2 metres Per second)- Therefore the forces acting on it may be regarded asresulting in a total pull and a total drag. Byexamining the position of the wings in different kinds of soaring flight we m shall be able to arriveat some conclusionsas to the directionfrom which the un-known force of soar-ability Fig. 63. Outline of a vulture fast flex-gliding(22 metres per second). Figs. 59 to 63 show outlines of a vulture whencircling and when flex-gliding at different speeds. It 198 ANIMAL FLIGHT.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectan, booksubjectflight
