Problems!! 14MZ 2.4 R6014FS

[diamondave5]

i was wondering if a floor and pilots would help, if i put a floor in i have to add a pilot, just not certain of inside temps say in the back of the plane, not under the canopy, if you do that i guess you need to use longer extensions for ail and such that you unplug for transport, i will still let others try it 1st, hehe

[jimbomilligan]

How about a mini compressor, condensor and evaporator for some cocpit AC ?

[Julez]

	Quote: Originally Posted by Jurgen Heilig
	Hi Julez, could you please check for components which fail at even lower temperatures? You know I started a thread on RC-Network about potential heat issues with 2.4GHz systems. Two models crashed last weekend wit R608FS on board. During ground tests, three R608FS failed at just 45°C (=113°F). Jürgen

Well, in my 606 Rxes, the tranciever was the only component failing. When the R failed after heat gun threatment, I gave each component a quick dash of CA kicker for cooling purposes. Instant recovery was only observed when said dash hit the transciever chip.

Concerning the 45°C: Earlier in this thread, it has been mentioned, that some temperature measuring devices can be up to 15° off.

[tobytorkn]

i have read a couple of times in this thread about why jr uses mutiple receivers for 2.4. why is it that futaba does not have to use multiple receivers placed in different configurations throughout an aircraft? i read about line of site, etc. what is the difference about futaba that excludes it from the same technique used by jr and now supposedly xps is going to multiple receivers as well? i would like a technical reason, not a guess. julez, any ideas? thanks, toby silhavy....

[diamondave5]

	Quote: Originally Posted by jimbomilligan
	How about a mini compressor, condensor and evaporator for some cocpit AC ?

you may want a mist system instead of an evaporator, the humidity is generally in the single digits around here(except for fromerely named "monsoon" season), after about 2 weeks of living in arizona my nose was hurting, turns out it was because it was filled with pebbles

[Jurgen Heilig]

	Quote: Originally Posted by Julez
	... Concerning the 45°C: Earlier in this thread, it has been mentioned, that some temperature measuring devices can be up to 15° off.

Are you sure? I can't remember having read anything like that and the search function also does not find anything.

Jürgen

[dick hanson]

stuf whut works:
tint the canopy-
provide an air outlet at rear of model - flying will extract air and movin air tends to balance temps internally those who remember --kwow that opening slightly, the drivers wing window and the rear passengers' window - created a fast cool down in the car.
avoid direct sunlight -if your rx does not like it
worse is direct sunlight thru a window into confined spaces
throw a towel on it when not flying - a white towel is best.
I stick my rx in the pilot's compartment - no problems but I don't leave the model setting in the sun.
You could build a white expanded foam box for the radio - this stuf is the best for insulation but the effort really isn't needed.
I wonder when some enterprising ARF maker will do a canopy which side hinges and includes quick releases on one side .
my little EFlite models use magnet setups which really work-but on a big shaker - too risky.
DZUS fasteners work but I don't see anyone adapting them

[mc3854]

I'll tell you something funny about the servos moving when you turn on the radio. If you have it in a helicopter it doesn't do that! Don't know what it the difference but the 14, 2.4 in airplane mode causes the servos to move when turning on! Same receiver in helicopter mode does NOT cause them to move when turning it on! Go figure!

[DR10044]

My 6ex deflects the servos, all analog, when it is turned on. My 12fg does not, all digital servos. I am not sure if that is the difference or not. Unless one of the servos is on a retract, which none of mine are, it is not an issue for me. Since it is not an issue for me I have not tried to see if I can stop it from happening.

By the way, the 6ex performed without a hitch last summer. I flew on many a 90 degree day.

[torquen]

I have not experienced the servo moving "thing". I just setup a 35% yak yesterday for a buddy of mine. 14mz 6014 receiver and all Futaba servos. When you turn on the switches the receiver instantly links up to the radio and goes straight to center. I turned on both of my 40% planes and they both go directly to center as well.
The people that are getting a servo movement, are you running Futaba servos? Because with 5 different receivers in 3 different planes I cant get this to happen.
Garrett Morrison

[grayuk]

Interesting feedback.
I have the same problem on a 14 rx with a 12FG.
Unfortunately it is the retract servo that does it and my gear goes up!
I have posted on the Futaba questions section but no answer from Bax or any other.
It always goes the same way so I will probably reverse the servo function so it always puts the gear down.
Paul

[grayuk]

	Quote: Originally Posted by DR10044
	By the way, the 6ex performed without a hitch last summer. I flew on many a 90 degree day.

I have flown the 6EX and now the 12FG, receivers used are 6,8 and 14 channel.
I have had ZERO problems with the gear; it has functioned perfectly in prop and jet alike. Temps in the UK are not as hot as we are seeing on this thread but, on the hottest days last year and the coldest days in the winter, I never had one issue.
The servo deflection is a pain, but not a real problem, and the temp issue that this thread is concerned with only kicks in at extremes forced by radiant heating.
I intend to monitor rx temps on the ground during the summer months and compare with ambient (just out of interest).
I was reading through an RCJI last night, the one with the boomer on the cover (Feb-March 08). There is an interesting comment in there by Dave Wiltshire in the ‘New to turbines’ section).
He is talking about the Spekrum system and states…”with the Spekrtum System the components used means that the maximum safe temperature is 85C”…. which is 185F (just 18F deg above Futaba) so it appears there is a documented lower limit on these as well. As is known, these temps cannot be reached with just normal ambient, but on very hot days, rx exposed to direct sunlight, both systems are vulnerable…
Along with the Futaba at 167F it makes you wonder how many mysterious crashes have been caused by this that have been attributed to other issues???
It looks to me that this is something that is inherent with the technology; maybe we just need to re-consider our installations. It is something we have had to do many times over as new technologies come along. Consider the learning curve associated with Turbines! Many crashes were the result of ‘conventional’ installs that were just not up to turbines demands. Big spark engines are another; more powerful digi servo's requiring higher powered systems and power boxs.......we had to change to move with the technology. This is true with the FASST lower voltage issue on servos, manufacturers of servos and add on powerboxs etc. are changing to match the technology change.
Those of us that are old enough will remember when the pulse width changed on rx outputs, (1.5ms to 1.2ms I think). It was a pain; our entire stock of old servo’s had the wrong centres.
I think we have to prepare ourselves for the fact that this may not be a ‘design issue’ of a ‘batch problem’ it may be the technology 'as it stands', we may have to live with it and adapt…

Paul