That depends. If you are planning on flying backwards a lot, then 4 may be necessary.Now.. should it be two pointing fron-down-outwards and one pointing straight down-back? Or vice versa? Or just 4 one on each corner?
ericgibbs said:hi dkn,
A point to consider with ultrasonic sound beams, they can be 'diverted' by a side draught of air.. perhaps the downdraught from the heli blades could be a problem.
What frequency range are you looking at.?
(Maybe I should just make BIG wide landing gear with a shroud underneath which the ultrasonics are mounted to help block rotor downdraft. Less manueverability...but who gives a crap about that anyways?)
ericgibbs said:If you block the downdraught with a heli mounted panel, won't that spoil the lift.?
You could fire the transponders sequentially, as you know velocity of sound in air about 330m/sec.
Should be enough time to scan and process 4 transponders OK.
Check that the heliblades are not pushing out any ultrasound at your frequency.
killivolt said:Is it possible to deploy a known device that has had complex circuitry. A simple camera with an auto focus ? Of course there would have to be room to mount it between the two rails ?
If I were to use the camera's focus ring and put a gear on the outside that could inter-phase another to operate a variable capacitor or dash pot ? It would automatically observe the positioning relevant to aperture once it is close enough to ground maybe you would want to eliminate it and deploy a more sensitive device ?
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