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Old Jan 30, 2005, 12:22 PM
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Measure The Speed Of Your Gws Plane ...?


Hello, is there something that can record or give my top speed or speed in all the flight ?
And that you can put on the plane ?
Regards
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Old Jan 30, 2005, 04:00 PM
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Quote:
Originally Posted by agapornis
Hello, is there something that can record or give my top speed or speed in all the flight ?
And that you can put on the plane ?
Regards
The easieast method does not need anthing in the aeroplane. Mark out a 100 foot course and use a stopwatch to measure the time the model takes to travel the 100 feet.

Then let T = time taken to travel 100 ft

100/T = ft /sec

ft/ sec *60*60 = ft/hr

ft/hr/5280 = MPH

So the formula is :-

MPH = 100/T*60*60/5280

Therfore MPH is aproximately = 68/T

Ken
Last edited by kensp; Jan 30, 2005 at 04:07 PM.
Old Jan 30, 2005, 06:01 PM
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Easy way is who have friend is working in Police Dept.? Check by radar gun.
Old Jan 30, 2005, 06:23 PM
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But really there is nothing that can mesure the speed like there is an on board altimeter there can be an on board speed check ?
Old Jan 30, 2005, 08:48 PM
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Quote:
Originally Posted by agapornis
But really there is nothing that can mesure the speed like there is an on board altimeter there can be an on board speed check ?
Will make some tele transmition device on airbrone with more fuction, or even video.
Old Jan 31, 2005, 04:57 AM
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On the jets forum it's been mentioned that there is a programme that will calculate the speed of a model from the doppler effect as it passes the microphone. Basically you video (or only audio I suppose) record a flat out pass then run the programme and it calculates the speed from the tonal change in the engine, hi tech enough
Old Jan 31, 2005, 05:45 AM
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Eagle Tree Systems makes a black box that takes many measurements including altitude and speed. Speed is based on air pressure and uses a pitot tube that attaches to the wing out away from the prop wash. However wind can also be a factor in that reading. I reviewed the Eagle Tree System and review was posted in Ezone in early December last year. System can also read RPM, battery status, temperature, how servos are working and more. Moderator Mike
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Old Jan 31, 2005, 07:50 AM
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My small handheld gps unit has a speedometer in it (will tell you top speed achieved). Also has an altimeter in it. You could chuck that in the plane and get the data from it. Only weights a few ounces.I once strapped it on my Nitro truck to get a top speed reading, worked fine.Just don't crash or loose the plane when a $500.00 gps unit is on board!!!
Jag
Old Jan 31, 2005, 07:58 AM
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Quote:
Originally Posted by Steve990
On the jets forum it's been mentioned that there is a programme that will calculate the speed of a model from the doppler effect as it passes the microphone. Basically you video (or only audio I suppose) record a flat out pass then run the programme and it calculates the speed from the tonal change in the engine, hi tech enough
It's hi tech alright, but can be done with a pair of musician's ears, a thermometer, a pen and paper, quickly. Accuracy depends mostly on the ears, though.
Old Jan 31, 2005, 09:01 AM
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Easy and cheap (read as free) via Doppler analysis!

Record a wav file on a PC then do a Fourier analysis for flight speed and even rpm (static & flight); a search over in EDF should get some good postings.

Did it on the audio of my Mustang’s video; no unloading & 73mph: http://rcgroups.com/gallery/showgall...500&ppuser=497 .


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