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Location: UFOUpDatesList.Com > 2004 > Feb > Feb 11

Re: Whittlesea Australia UFO Photograph - Bright

From: Dan Bright <ufo.nul>
Date: Tue, 10 Feb 2004 22:02:24 -0000
Fwd Date: Wed, 11 Feb 2004 07:05:18 -0500
Subject: Re: Whittlesea Australia UFO Photograph - Bright

>From: Martin Shough <mshough.nul>
>To: <ufoupdates.nul>
>Date: Mon, 9 Feb 2004 21:13:10 -0000
>Subject: Re: Whittlesea Australia UFO Photograph

>The wings on the other hand are stopped with very little
>vertical oscillation during the exposure. You can see this
>clearly on the wing which is pointed more or less straight at
>the camera and makes a thin bright highlight.
>This suggests that the wing is beating slowly relative to the
>lateral bulk motion of the object, which in turn suggests (to
>me) the aerodynamic lift of a bird rather than a bug.

Hello Martin et al,

Beetle wings move between 46 and 90 beats per second. On
average, beetles are able to travel at 5km per hour
(3.106856mph, 1,388.89mm/sec, 54.68 inches/sec).

The exposure time here was 1/250. Therefore, our "average"
beetle could have travelled 0.22 inches (around quarter of an
inch) over the period of the 1/250 exposure.

The "Christmas beetle" (Anoplognathus sp., subfamily Rutelinae),
which Diane indicated was common to the area at the time of the
photograph, has an average body length of 25mm (0.98 inches).

Going by these figures, if flying flat-out at 54.68inch/sec, a
Christmas beetle could have travelled around one quarter of its
length during a 1/250 exposure.

By contrast, a horsefly can be up to 30mm long (1.2 inch), can
beat its wings up to 100 times per second, and has a top speed
of 22km/h (240.59 inches per second). That's 0.96 inches of
movement in a 1/250 exposure, or 80% of body length.

It's also worth considering that blurring (especially at both
the left or right extremities) could appear not only due to
forward motion but also lateral deviation from a linear forward
trajectory, involving changes of heading, altitude and attitude.


Dan Bright

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