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Old Jan 30, 2005, 11:22 AM
agapornis
italy
Joined Jul 2004
403 Posts
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, 03:00 PM
Registered User
kensp's Avatar
Darwin Australia
Joined May 2002
6,960 Posts
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
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Last edited by kensp; Jan 30, 2005 at 03:07 PM.
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Old Jan 30, 2005, 05:01 PM
Houng-wen Lin
GWS4CEO's Avatar
Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,445 Posts
Easy way is who have friend is working in Police Dept.? Check by radar gun.
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Old Jan 30, 2005, 05:23 PM
agapornis
italy
Joined Jul 2004
403 Posts
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 ?
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Old Jan 30, 2005, 07:48 PM
Houng-wen Lin
GWS4CEO's Avatar
Shijr, Taiwan. DungGwan, China. City of Industry, California.
Joined Sep 2001
19,445 Posts
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.
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Old Jan 31, 2005, 03:57 AM
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Birmingham Intl, Great Britain (UK)
Joined Jul 2004
969 Posts
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
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Old Jan 31, 2005, 04:45 AM
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Michael Heer's Avatar
Stockton, Ca. USA
Joined Apr 2001
9,464 Posts
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, 06:50 AM
I fly for Beer
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Chilliwack, B.C. Canada
Joined Sep 2004
2,730 Posts
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
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Old Jan 31, 2005, 06:58 AM
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Taipei Shek, Taiwan
Joined Aug 2004
458 Posts
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.
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Old Jan 31, 2005, 08:01 AM
jrb
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Edina, MN, USA
Joined Oct 1999
11,430 Posts
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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