Problems!! 14MZ 2.4 R6014FS

[Judge]

	Quote: Originally Posted by jonkoppisch
	Good info! We're using them in the jets down here. It gets hot as heck here in the summer! I guess I'll have to tell the guys that they need to use another receiver or put their jet back in the AC until they're ready to fly again, EEK! Of course this isn't futaba's fault but if they so decide to correct the issue it would sure be nice if they could update the 2.7v annoyance as well..

Or rather than spread panic you could make it clear that this is not proven yet and is only suspected. I cannot imagine that Futaba will not look into this and take it seriously.

The 2.7 volt "annoyance", as you well know (since I know you've been following the other threads), is a result of a new chip design. There is nothing that can be done short of reverting to an older, slower, chip.

[dbrford]

Just want to jump in as I have the had same experience with 6014 totally locking out. We did not put 2 and 2 together that it might be heat but did notice the receiver was very hot. My setup does have two tuned piped in the fuselage which contribute for sure. I wonder if this might be the same issue.

Mine occured on the ground, fly at large field with a dry lake bed for the morning and a paved runway for the afternoon, was taxing the plane on the ground to the paved side when this happened, all control lost to plane it was doing donuts in the middle of the lake bed, was funny (in a sad way) to me running around the airplane trying to shut the ignition battery off to kill the motor.

I could not get the airplane to turn back on by cycling the switches. I covered it up and ran home to grab my 72mhz reciever as I wanted to keep flying. When I returned tested again and all was fine with the 2.4, could not recreate. I did switch back to 72mhz as I did not want to risk the airplane. I have plans to send in the receiver and the module but since I am running Hitec 5955's I figure I am screwed from a support perspective.

Edit- I had 31 flights on the 6014.

[lazun]

We tested out the RX in a new environment. We placed it on a balsa sheet 4X6 with heat shielding tape at the top and the RX on the bottom. RX is in the shade. The balsa and tape are in sun light. With the ambient temp of 87 degrees the RX was at 133 degrees!!! No power too it. No direct sun light too the RX. Not even inside the fuselage. Just on a test bed of balsa with heat shielding tape. We did not wrap the RX in foam. However, it was shielded from direct sun light.

Futaba is going to have to seriously look at this and test it out. Our feelings on this are Futaba is going to have to rectify this according to our findings. We could be wrong. However, the facts are pretty convincing to us. A bigger heat sink, chip or board that will take higher temps. Talking to some engineering folks (not specific to this area, but in the electronics biz); they say tests are done up to the mid 250’s and higher on household items.

We have not seen hot temps yet in the USA since these RX’s were release. I can guarantee you it will be very difficult to keep the temps below the threshold we discovered. Even with the RX in the shade we were seeing pretty high temps and it is not very hot outside yet in PHX. This will not be a simple fix, because keeping the temp down will be hard. The temps rise too the 100’s in 1-2 minutes. Remember we flew all winter and in the evenings with no problems on these Rx’s. However, 4 different Rx’s have failed under these warmer conditions.

It was unfortunate when we spoke with Krysta on Thru we had not stumbled onto this. We got our RX’s back from her with no problems to be found.

I hope Futaba can answer our concerns and guide us and others too a solution. I want to be clear we are not engineers. We are just pointing out some facts on tests we have conducted.

[dick hanson]

	Quote: Originally Posted by 1bwana1
	Great job guys, if this turns out to be true we owe these guys thanks for discovering it before people lose planes. As expected there will be a learning curve with this new system. Like Judge says, it may end up just being another thing to keep in mind when designing an installation. I'm glad to see that this thread is focusing on the issues, and solutions, not bashing. keep us informed!

I had questions on cooling for "tuned pipes" -and the thermal rise in a "fishbowl" is part of the problem
If you want to helpthings short of smoked glass(it helps ) put open ducts in aft sides of the fuselage - -it maynot appeal to some but it does create a good chimney effect for moving air
On my ARFS - I always left the servo holes under the stab -open -just to keep the radjo cool

[jonkoppisch]

	Quote: Originally Posted by Judge
	Or rather than spread panic you could make it clear that this is not proven yet and is only suspected. I cannot imagine that Futaba will not look into this and take it seriously. The 2.7 volt "annoyance", as you well know (since I know you've been following the other threads), is a result of a new chip design. There is nothing that can be done short of reverting to an older, slower, chip.

You're right, I'll just point them to this thread instead...

[reyn3545]

Speaking of airflow... I do have cooling 10 cooling slots cut under my 100cc cans, and the only area I have for air to escape is the holes I cut for the pull-pull cables. I added a power system to the plane over the past week or so (to take care of the 2.7 volt thing) and I must have cut a small zip tie while working on the plane and not remembered to get it out of the fuse.

After my first landing, I saw about a 4 ince piece of nylon sticking out of the top of the vertical stab/rudder hinge. the zip tie had blown itself all the way through the fuse (composite), worked its way through 2 formers in teh tail, and then blown about a foot UP the vertical fin. The "head" of the zip tie was stuck in the hinge. I was able to work it back into the fuse and fish it out, but to see what had happened gave me a real feel for how much air pressure is in one of these fuses. I probably need to cut a decent hole in the back bottom of the fuse to let some of that air out.

[dick hanson]

	Quote: Originally Posted by reyn3545
	Speaking of airflow... I do have cooling 10 cooling slots cut under my 100cc cans, and the only area I have for air to escape is the holes I cut for the pull-pull cables. I added a power system to the plane over the past week or so (to take care of the 2.7 volt thing) and I must have cut a small zip tie while working on the plane and not remembered to get it out of the fuse. After my first landing, I saw about a 4 ince piece of nylon sticking out of the top of the vertical stab/rudder hinge. the zip tie had blown itself all the way through the fuse (composite), worked its way through 2 formers in teh tail, and then blown about a foot UP the vertical fin. The "head" of the zip tie was stuck in the hinge. I was able to work it back into the fuse and fish it out, but to see what had happened gave me a real feel for how much air pressure is in one of these fuses. I probably need to cut a decent hole in the back bottom of the fuse to let some of that air out.

a small vent in each side -low on the fuselge is more effective as one side or the other is always at low pressure just don't wreck stuctural integrity

[dubd]

	Quote: Originally Posted by jonkoppisch
	You're right, I'll just point them to this thread instead...

Exactly! Any issue, even if just speculation should be made aware to people who own the system. A good friend/flying buddy would do that regardless of what the guys in orange say. I had a feeling the bugs would pop-up in the FASST systems, which is why I sold my 14MZ and switched over to Spektrum a couple months ago. Not that Spektrum doesn't have it's issues, but we know what they are. I really hope Futaba finds a cure for this as I know a lot of guys with the 6014 in some very expensive planes.

[JagerBomb]

	Quote: Originally Posted by dubd
	I had a feeling the bugs would pop-up in the FASST systems, which is why I sold my 14MZ and switched over to Spektrum a couple months ago. .

This is the point where this informative thread will end up getting sent to the trash heap. You guys and your petty brand wars are ruining this site. It was pointed out earlier in this thread that good info was being brought up and it would help all, don't spoil this by interjecting my Chevy is better than your Ford bullcrap.

Mark Trent

[high alpha]

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[JagerBomb]

	Quote: Originally Posted by high alpha
	Pot calling the kettle black.... .

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[Radioactive]

Best to wait and get some feedback from Futaba, i'm sure they do testing and offer a directive as needed.