Problems!! 14MZ 2.4 R6014FS

[Mokken]

When someone finds something wrong with A123 batteries, the hobby will be screwed, everyone will go back to 72mhz and Nicad Batteries!!

Sorry, you have to find some humor in all this. Fact that everyone jumps on a new technology thinking that it's tried and true is just a small form of ignorance. Sorta like buying the first year model of a new car, it's only a matter of time before someone finds a flaw in it's design and future models are improved upon.

You guys are force fed all this new stuff and so many jump on the latest and greatest, when in reality what they where using, worked just fine.

Go ahead mods, delete this post too!!, just like you did my last one.

[madmax]

Eeeeeeeasy Mokken.

[blkbird68]

	Quote:
	Fact that everyone jumps on a new technology thinking that it's tried and true is just a small form of ignorance.

Hate to brake it to you buddy. There is nothing new about the this technology, or the RoC's being used in these units.

The thermal limits of the RoC's are available to anyone capable of reading the data sheets. So about the only "problem" I see in this matter, might be a case of a company or companies not understanding all the environments that their end product may be asked to endure and failing to pick their components properly due to this misunderstanding.

[Mokken]

	Quote: Originally Posted by blkbird68
	Hate to brake it to you buddy. There is nothing new about the this technology, or the RoC's being used in these units. The thermal limits of the RoC's are available to anyone capable of reading the data sheets. So about the only "problem" I see in this matter, might be a case of a company or companies not understanding all the environments that their end product may be asked to endure and failing to pick their components properly due to this misunderstanding.

The technology may not be new, but it's new to R/C. And everyone in R/C jumps right on a new technology, it could be a new motor (cough..cough...New DA-100), all this 2.4 stuff, it don't matter, people see new and they break out the wallet.

And what's with all the new folks in this thread? I've never seen more new faces making there very first post in a thread on FG before. I sense some alias games going on. So funny..

[Mokken]

	Quote: Originally Posted by madmax
	Eeeeeeeasy Mokken.

I'm ok, but several others are having there posts deleted and nothing bad was said.

I don't get it..

[bgold]

One thing I know I'm going to do is remove the heat gun from my fusalage. Reference "Polar Bear IMAC" pictures, you needed de-iceing equipment.

[Jurgen Heilig]

	Quote: Originally Posted by grayuk
	We would expect the rx to be hotter than ambient, and looking at the figures, worst case was 20degF. The rx only reached 102F which is nowhere near the 164 F needed for a failure. The additional thermal energy is coming from outside the rx to make it fail. ...

A temperature delta of 20°F appears too much. My R6014FS only warmed up 9°F against ambient temperature in 20 minutes (stabilized after approx. 10 min). JR components are rated -15°C to 55°C and there are much more temperature sensitive RC components - like gyros (40-45°C max.).

Jürgen

[Jurgen Heilig]

	Quote: Originally Posted by Julez
	... As the 2.4 recievers need more electrical power, the linear regulator will produce more waste heat. ... The same happens, in my opinion, to the regulator of the Fasst RX. To test this, one could check if the RX can work in higher ambient temperatures if one lowers its supply voltage. Less supply voltage, less waste heat. One could try with 3V, for example. Then with 6V, then with 9V. ...

Not all 2.4GHz receivers need as much power as FASST receivers.

It is not just the losses of the regulator. Basically all energy going into the rx is transferred into heat, very little is transferred into light by the LED.

I would not try 9V when the rx is specified for 4.8 to 6V by the manufacturer.

Jürgen

[Julez]

Well, I think it all boils down to RTFM.

http://manuals.hobbico.com/fut/tm14-manual.pdf

[Jurgen Heilig]

	Quote: Originally Posted by Julez
	Well, I think it all boils down to RTFM. http://manuals.hobbico.com/fut/tm14-manual.pdf

I would even call it common sense.

Other manufacturers (JR, Multiplex ...) however give more precise information:

Permissible
operating
temperature range
- 15°C … +55°C

55°C = 131°F

Jürgen

[grayuk]

	Quote: Originally Posted by Mokken
	And what's with all the new folks in this thread? I've never seen more new faces making there very first post in a thread on FG before. I sense some alias games going on. So funny..

I think there is a bit of paranoia creeping in here!
One new face is me, I was put onto this thread by a friend because I have been testing FASST extensively in the UK. My thread is here.

http://www.rcuniverse.com/forum/m_6188151/tm.htm

Julez has also done extensive testing in Germany, that is how we know each other.
I, like you, have thousands of pounds (dollars) worth of models to protect and enjoy.
I love FASST, to me it is a superior system to anything else on the market. If there is an issue such as this, it is good to get it out in the open to protect your investment and mine.
I asked Julez to pop on because he has the equipment, the knowledge and experience with FASST to add a technical edge to this problem.
All any of us are interested in is flying our models safely, no more no less. It is true that this problem appears to be limited at the moment but summer is coming!
How much better is it to be aware of a potential issue than to go blindly on until your hard earned bucks end up as matchwood or even worse someone is killed!

Paul

[Kiwi]

Grayuk,

Thats probably one of the most sensible posts I have seen here for a while and I'm pleased as a person with an interest in the site to see new guys coming over to join in with facts, opinions or just to have a browse. It matters not as this is not a closed club with invited guests only.

For what its worth I done some slow cooking yesterday with one of the very first 7 channel fasst receivers and like most every one else that has tried it, it failed. But it failed really easily and even with the red light on you could hold it against your cheek and it was NOT HOT to touch. Warm of course but certainly it was at a temperature easily achievable if you left it in the sun and even more so inside a glass house cockpit on a large scale plane.

I took the same test and cooked a SPEKTUM AR7000 unit. I got to 185 F degrees which I consider unobtainable in the sun or even in a glass house cockpit and it performed exactly as it did at 70 F. I see where someone got one to fail at 200 plus so that shows there is a limit but thats above the boiling point of water and there will be lots of other issues before your plane ever gets that hot inside.

What I am sure of is Mr Futaba is frantically having his weekend ruined as they look for a solid solution.