Re: [Paparazzi-devel] distance measurement for landing.

[Andrew S]

Thanck you Joe
It is very interesting. 
My friend ve done that helicopter few years ago, for one client. For now we are 
going to make autopilot for it (some is done). Helicopter is one rotor+tail 
rotor, main rotor diameter 3 meters, all components are similar to model rc 
helicopters, but bigger,  engine - 3W opposite, gear - bike chain :).
Regards, Andrew 

> Tell a little about your large helicopter - I am interested - we use one,
> not so big, here in Namibia for photo shoots, and are working of a full
> autopilot for it. Saw some very interesting heli's from a company in Germay,
> capable of 15kg payload, twin turbine engine, etc. Very Nice indeed.
> Regards all
> Joe
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden
> ] On Behalf Of Andrew S
> Sent: Saturday, November 07, 2009 8:34 PM
> To: address@hidden
> Subject: Re: [Paparazzi-devel] distance measurement for landing.
> Hi Joe.
> i am interested in UWB radar too, could you tell me some words at greater
> length?
> We are working on 20 kg helicopter, and now selecting some of radio
> altimeter..
> Thanks in advance, Andrew
> 06.11.09, 21:23, "gisela.noci" :
> > Have tried this type of sensor - useless - does not work at all over
> grass,
> > nor over desert gravel/sand mix. Ok over tarmac runway, up to maybe
> 2meters
> > - not really a reliable option at all - really needs good surface
> > reflectivity
> > I do autoland using ultrasonic sensors - 4 Murata MA40B8S transducers
> pulsed
> > in parallel with 55volts Peak to Peak, and 1 MA40B8R as receiver sensor,
> in
> > an own designed circuit. This works very well, giving 8 meter reliable
> > detection over almost any bad terrain, except tall grass ( tall = more
> than
> > 500mm). Over Tarmac range is about 13meters. Uses a PIC processor. 
> > You need LOTS of TX energy, hence 4 transducers hammered at the max
> voltage.
> > The LV-MAXSONAR EZ series are as useless - just not enough energy for
> > surfaces with low reflectivity. 
> >  I am working on a UWB radar ranger, which is really the answer - 2 watts
> > power consumption will give range from 200mm to 1200meters, the hassle is
> > antenna space needed - will not work on your average flying wing type A/C,
> > but great on a 60 size trainer or similar.
> > Don't waste your money on the Infra Red route...
> > Joe
> > -----Original Message-----
> > From: address@hidden
> >
> [mailto:address@hidden
> > ] On Behalf Of Chris
> > Sent: Friday, November 06, 2009 7:42 PM
> > To: address@hidden
> > Subject: [Paparazzi-devel] distance measurement for landing.
> > Hi.
> > I would like to hear any opinions on those sensors:
> > http://www.acroname.com/robotics/parts/R302-GP2Y0A700K0F.html
> > and
> > http://www.acroname.com/robotics/parts/R144-GP2Y0A02YK.html
> > They look interesting and i am tempted to try and add them to the
> paparazzi.
> > Which one should you choose?
> > Chris
> > _______________________________________________
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