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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Spektrum DSM › Futaba Vs Spektrum issues ?
02-26-2010 04:32 AM  10 years ago
vinrx7

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Americas finest city

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I have had my Futaba 9C for 9 years. I just now upgraded to the new 10CHG. My 9C is still working great but i figured it was time to get into the 2.4 game. BTW.. if you lost power in flight, you wouldnt be able to pull it off with an electric heli because you have to be at zero stick in order for the esc to arm itself. your toast no matter what gear you run.STUPID TREE!!!
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02-26-2010 02:04 PM  10 years ago
ttsingram

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Lincoln, Ne

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I started in helis with an Airtronics RD6000, ended up selling it because I had a better chance of finding a virgin stripper than someone around here that had one to help.
That brings up a good point. I also started with the RD 6000, and still use it today. But no one here used it either, I just figured it out with the help of people on RR. It doesn't matter what system is better, if there is no one to help show the full potential what good does it matter.
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02-26-2010 07:43 PM  10 years ago
rexxigpilot

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It's an extremely bogus test! First, as others already pointed out, the Futaba RX was still operating at 3.0V. The JS/Spektrum servos stop at 3.0 V as does the Spektrum RX.

Secondly, notice how Adams diliberately has the Futaba antenna crossed throughout the video. At around 3:44 of the video he accidently bumps the Futaba RX so it no longer had the antenna crossed. At 3:45 he very deliberately moves the Futaba RX and CROSSES the antenna again. WTF! That's not how the manufacturer says to align the antenna. This likley had something to do with how fast/slow the signal between TX and RX was established after switching the juice back on.

Thirdly, the whole setup using a variable voltage power supply is inconsistent with real world conditions using a battery, even a regulated battery. Battery voltage drops under electrical load. The highest loads are for a very short duration. They generally coincide with the peak mechanical load such as while pitch pumping and doing tic tocs where the heli's direction changes quickly. A resilient system can withstand these short drops in voltage. A system prone to shutting down cannot.

The old remedy for brown out problems with early version 2.4 JR/Spektrum RX's was to use a capacitor to keep the voltage to the RX from dropping due to instantaneous voltage drops. This kept the system from resetting under real world conditions. Under sustained low voltage, the capacitor would lose its charge and the RX would shut down. The use of a variable voltage power supply provides sustained low voltage.

My post is not intended to denigrate the JR/Spektrum system. However, this test is of little value regarding brown out potential of either system. It showed me that the Futaba RX stays alive at lower voltages than the Spektrum. And that JR/Spektrum servos stop working at 3.0 volts.

What was the real purpose of the video?
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02-26-2010 07:46 PM  10 years ago
jackheli

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Vancouver - Canada

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As I pointed out on youtube at the time:
That spectrum test made me laugh so much! It is hilarious!

AND completely flawed!

Who said it is not the same servo model that stalls at 3V? You can clearly see that the Futaba receiver still has the light on when the Spectrum shuts off.

If were a Spectrum customer I would be really worried about trying to be mislead by this video!

And the guy calls himself technical director. Ha, ha...
It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.
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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Spektrum DSM › Futaba Vs Spektrum issues ?
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