Problems!! 14MZ 2.4 R6014FS

[lazun]

	Quote: Originally Posted by Jurgen Heilig
	And what is the operational temperature range for JR/Spektrum gear? -15C to +55°C If you exceed those limits, the RC manufacturer is not responsible for equipment malfunction - You are! Jürgen

The thing, it is failing within spec range!!!! If you want to talk about who is responsible leave it to the courts to decide.

[1bwana1]

	Quote: Originally Posted by grayuk
	The point Jurgen was making was simply that by changing from FASST to Spekrtum you have not gained much benefit, the units fail at high temps as does XPS. The difference is a few degrees in reality. Paul

I don't recall ever seing a report of a Spektrum system failing due to heat because it was mounted under the canopy. Can you point me to one?

[lazun]

	Quote: Originally Posted by Fish07
	Another one....huumm,this sounds suspicios to....

I guess you can stop with the conspiracy theory since Yuri’s name came up!!! Jason Krause failed 3 RX's (7ch, 8ch, 14ch). You should thank your Futaba team members for being honest and thinking about the modelers and bringing a concern to light as the weather starts to heat up. I admire that in my cousin. And it makes me believe in TEAM FUTABA!!!! Don't worry, someone smarter than us will let us know what we or they are doing wrong.

[Jurgen Heilig]

	Quote: Originally Posted by lazun
	The thing, it is failing within spec range!!!! If you want to talk about who is responsible leave it to the courts to decide.

Well, I have not seen a temperature range for a commerically available RC system to exceed +60°C (= 140°F) and you reported the failures occurred at 164°F.

Jürgen

[grayuk]

	Quote: Originally Posted by 1bwana1
	I don't recall ever seing a report of a Spektrum system failing due to heat because it was mounted under the canopy. Can you point me to one?

There is not a report of a Spektrum ‘knowingly’ failing under a canopy.
But tests of failure temps for XPS, Spektrum and FASST are listed in this thread.
Post # 219

607 failed at 172F, and came back to life at 130F.AR7000 failed at 205F.

So there is around 30F difference on this test.


My point being that it could still fail!
We don’t know what temps are getting to under the canopies. Why take the risk?
Take the rx out of harms way.
If you are worried about the carbon in the Fuselage then just put the 2 aerial ends in the cockpit. Get the rx down under the floor, clear of the beating sun.

Paul

[Flyfalcons]

This is the setup I plan on running in my Comp-ARF

[lazun]

	Quote: Originally Posted by Jurgen Heilig
	Well, I have not seen a temperature range for a commerically available RC system to exceed +60°C (= 140°F) and you reported the failures occurred at 164°F. Jürgen

You didn't read correctly then.

1:47 Rx 115*F (under shield) lifted shield slightly, not letting sunlight hit receivers and read temperature of right receiver only

1:49 No temperatures read put canopy on aircraft

1:53 Rx 135*F receiver failed

Moved plane into shade, took off canopy, read temperature of receiver at 135 degrees F. Let it cool on its own in shade and receiver began working again at 108 degrees F.

[reyn3545]

I couldn't make it to the field to day, but I did a little testing (verification, really) in the back yard. The ambient temp was 85 degrees, and my receiver is sitting on a Smart-Fly power adapter, directly under the clear canopy of my composite 100cc plane.

I let the plane sit in the yard for about 3 hours, direct sunlight. When I checked it, the receiver was 163 degrees. No motor running, no other protection from the direct sunlight, other than the canopy (which could magnify the problem.

When I turned the transmitter and receiver on, there was no signal. I let the receiver cool until it would properly initialize on a power cycle.. it finally did that at about 130 degrees. I think this is consistent with other findings.

I have cans on this plane, with no protective shrouding around them, they are just open to the fuse body. I do have cooling vents cut in the fuse under the cans. I'm going to do some testing this weekend and see how the temps look with the motor running (on the ground).

One quick question for anybody who may have a "floor" in thier cockpit at the bottom of the canopy... have you been able to re-create the problem?

My biplane has all of the gear installed from an opening in the bottom side of the fuse. Its a wood ARF, so I didn't want to let the covering sit for hours in the direct sun, but I did leave it out there for about an hour. When I tested it, the temp of the receiver was exactly the same as the ambient temp.

So, if it holds true, I might build a full platform at the bottom of my canopy, hiding all of the electronics under it from the direct sunlight.

[Jurgen Heilig]

	Quote: Originally Posted by lazun
	You didn't read correctly then. 1:47 Rx 115*F (under shield) lifted shield slightly, not letting sunlight hit receivers and read temperature of right receiver only 1:49 No temperatures read put canopy on aircraft 1:53 Rx 135*F receiver failed Moved plane into shade, took off canopy, read temperature of receiver at 135 degrees F. Let it cool on its own in shade and receiver began working again at 108 degrees F.

Well, if you keep changing the story:

http://www.flyinggiants.com/forums/443621-post52.html

Excerpt:

We moved the aircraft into the sun and in 5 minutes one receiver failed. Its temperature read at 164 degrees F about one minute later, the other receiver failed at 165 degrees F.

We did the test a second time starting in the shade with the receivers being off and their temperature cooled down to 97 degrees F. At 1:03 pm with the temperature at 97 degrees F we turned the receivers back on. We put the aircraft in the sun. At 1:08 pm the temperature of the receiver case rose to 163 degrees F and one failed. The second one failed two minutes later at 1:10 pm at 165 degrees F.

Even if it fails at 135°F, it may still be outside the spec, because we don't know the Futaba rx specs.

Jürgen

[Woketman]

Why is everyone saying that Futaba is working on it? Over in the R/C Universe thread Bax says something like "they have only known about this for two weeks, give them a chance"! It would take me about 3 hours in my garage with a heat gun to try 10 different 6014 receivers and either confirm or prove false this temperature sensitivity theory. It should take Futaba less time.

They have had plenty of time to test & issue a statement that either there is or is not an issue. Not looking for a cure that fast, but at least they need to make a definitive statement NOW!!!

[lazun]

	Quote: Originally Posted by Jurgen Heilig
	Well, if you keep changing the story: http://www.flyinggiants.com/forums/443621-post52.html Excerpt: We moved the aircraft into the sun and in 5 minutes one receiver failed. Its temperature read at 164 degrees F about one minute later, the other receiver failed at 165 degrees F. We did the test a second time starting in the shade with the receivers being off and their temperature cooled down to 97 degrees F. At 1:03 pm with the temperature at 97 degrees F we turned the receivers back on. We put the aircraft in the sun. At 1:08 pm the temperature of the receiver case rose to 163 degrees F and one failed. The second one failed two minutes later at 1:10 pm at 165 degrees F. Even if it fails at 135°F, it may still be outside the spec, because we don't know the Futaba rx specs. Jürgen

I am not changing the story. You still do not understand. They fail as low as 130!!!

[reyn3545]

Fast Forward this conversation a few weeks... Futaba finally speaks... I'm sure they'll announce that the maximum operating temp for their receiver is somewhere around 50 degrees celcius... 122 degrees Fahrenheit. It will be the owner's responsibility to take whatever steps necessary to keep the receiver below this threshold.

OK.. now what do we do? As long as there's air flowing across the surface, the heat should be taken away. On the ground, however, we're going to have to take some precautions!