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Old 09-09-2011 | 07:53 AM
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Default LiFe and ignition

Hi to all
Is it safe to operate an rcexl ignition with LiFe 6.6v
i have a digiswitch on the my plane and it's work fine with Lipo 7.4v
but when connecting a LiFe 6.6v the digiswitch will not turn on it's blinking red+green
replaced back to LiPo and it's worked fine again.
thanks
ilan

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Old 09-09-2011 | 08:01 AM
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Default RE: LiFe and ignition

Page 5 and 6 detail how to change input settings.Hope this helps
[link]http://www.powerbox-systems.com/shared/download/bedienungsanleitungen/DigiSwitch_EN.pdf[/link]
Old 09-09-2011 | 10:02 AM
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Default RE: LiFe and ignition

Thank you mighty9
i didn't know that it can be change ohhh the technology

ilan
Old 09-23-2011 | 11:01 AM
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Default RE: LiFe and ignition

LiFe is the ideal rx battery, safe, low internal resistance and low energy loss when using a regulator (only 0.6V compared to 1.2V for a lipo).

Better is ofcourse not to use regulators and such but then you need devices that can have the high voltages.
I don't know modern ignitions can operate at voltages of 7V but for instance Multiplex Rx components can.
Old 09-23-2011 | 08:17 PM
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Default RE: LiFe and ignition

I just got a new 1300mah Life battery from Tower Hobbies. Only 2.5 oz! It came almost fully charged, only took a couple of minutes to top it off. I tested it's discharge capacity down to 5.2 volts (could have gone safely down to 5.0 I think) and guess how much came out of it? ..... 1301mah. How about that folks?

Ernie Misner
Old 09-24-2011 | 02:32 AM
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Default RE: LiFe and ignition

I have completely changed over to LIFE batteries. For my ignitions, I use a diode from Wrongway RC. No issues, no problems.
Old 09-25-2011 | 11:58 AM
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Default RE: LiFe and ignition

The diode is a nice safety but it should be necessary if the ignition is rated at 6V (NiCAD).

Five cell NiCAD packs top off at 7.2V off the charger. They drop to 6.9V fairly quickly and then spend a lot of time between 6.8V to 6.0V

A Life battery pack spends 85% of it scapacity at 6.6V, well within what a NiCAD is delivering.
Old 09-25-2011 | 12:23 PM
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Default RE: LiFe and ignition

I'd run the diode, I do all on of my igitions. Cheap insurance.
Old 09-25-2011 | 09:26 PM
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Default RE: LiFe and ignition

Hi TimBle, do you mean the diode or regulator should be UNnecessary? Problem is most of the ignitions that I have heard of are not rated for up to 6 volts.

Thanks,

Ernie Misner
Old 09-26-2011 | 12:20 AM
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Default RE: LiFe and ignition

The RCexl Ignitions are rated at 4.8V or 6V.
I.e. they can run off either a 4 or 5cell Nickel based battery pack.

Miost folk run a diode. I do as well and then i don't and then I do and then I don't and it does not seemt o affect the ignition at all. Thats my observation. the vast majority seems to advise using a diode as a good idea. I'm sure it is
Old 09-26-2011 | 01:00 AM
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Default RE: LiFe and ignition

I have seen the RCEXL 6,0V (max 7,0V) rated ignitions run successfully on LIFE batteries with no diode, I have also seen 'faulty' ignitions that have been run on LIFE with no diodes. Do i run LIFE on my ignitions - yes on everything! i run a single diode or in the case of DLE 20 ignition module 2 diodes. Have i ever cooked an ignition - no.......
Old 09-26-2011 | 05:52 AM
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Default RE: LiFe and ignition

Ernie,

You'll do yourself a world of good to read this msg on ign voltages.....
http://www.rcuniverse.com/forum/fb.asp?m=10139455
Old 09-26-2011 | 08:01 AM
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Default RE: LiFe and ignition

I have two planes running DLE 20s using a single LiFE battery to power the ignition and RX. I'm using either an RCEXL or 42% opti-kill to turn the ignition on/off. I have a diode between the opti-kill and ignition module to drop the voltage to acceptable levels.
Old 09-26-2011 | 01:57 PM
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Default RE: LiFe and ignition

A123 (not LiFe)straight to the ignition. Manufacturer says it's good to go so I keep it simple.
Old 09-26-2011 | 08:52 PM
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Default RE: LiFe and ignition

Thanks a1PCfixer! I was thinking old school on the early ignitions that required 4.8 volts. HOWEVER, following that link, Jody did make an interesting case or two for not using the higher voltages..... ? (shorter battery life at 6 volts and still more failures)

>>> While the Rcexl literature states the acceptable maximum input voltage range is up to 7 volts, it also states the typical voltage input at 4.8 volts. Two other aspects that are worthy to note are that the current consumption of the ignition at 6.6v input is double what it is at 4.8v, this means your battery will only last 1/2 as long. Lastly, as one that sees many, many engines and ignitions, I can tell you that the failure rate for ignition modules run with input voltage above 6.0 volts is roughly double that of modules run with <6.0 volt inputs, once you're able to see the larger volume sample size it's clear that <6.000 volts makes the ignition much more reliable and robust. >>>

Thanks,

Ernie
Old 09-26-2011 | 10:52 PM
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Default RE: LiFe and ignition

I use Li-Fe packs with all my Aircraft.
No issues on Rcexl CDI's. However I do use a reg on the older CRRC-Pro CDI's. The newer ones are Rcexl now.

Cheers
Grossy
Old 09-27-2011 | 02:09 AM
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Default RE: LiFe and ignition


ORIGINAL: Ernie Misner

Thanks a1PCfixer! I was thinking old school on the early ignitions that required 4.8 volts. HOWEVER, following that link, Jody did make an interesting case or two for not using the higher voltages..... ? (shorter battery life at 6 volts and still more failures)

>>> While the Rcexl literature states the acceptable maximum input voltage range is up to 7 volts, it also states the typical voltage input at 4.8 volts. Two other aspects that are worthy to note are that the current consumption of the ignition at 6.6v input is double what it is at 4.8v, this means your battery will only last 1/2 as long. Lastly, as one that sees many, many engines and ignitions, I can tell you that the failure rate for ignition modules run with input voltage above 6.0 volts is roughly double that of modules run with <6.0 volt inputs, once you're able to see the larger volume sample size it's clear that <6.000 volts makes the ignition much more reliable and robust. >>>

Thanks,

Ernie
Two other points to consider;

1) Higher input voltage does not equal higher ignition output
(more accurately, we lack the ability to measure the minute increase)
(and such tiny increase does nothing to improve eng operation)

2) Higher input voltage is wasted energy that gets dissipated as heat.
Guess where that occurs?
Old 09-27-2011 | 09:30 AM
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Default RE: LiFe and ignition


ORIGINAL: a1pcfixer

Two other points to consider;

1) Higher input voltage does not equal higher ignition output
(more accurately, we lack the ability to measure the minute increase)
(and such tiny increase does nothing to improve eng operation)

2) Higher input voltage is wasted energy that gets dissipated as heat.
Guess where that occurs?
Have you actually got measured and factual results for the above statements? I would be very glad to discuss it with you,not being funny- we have been doing sometesting and I am not going to post everything here now. We have some more testing still being done and when complete i will postit. However we have seenthat higher input DOES equal higher output, but further testing is in progress. point number 2 you eldude to heat being dissipated i prrsume in the module.Again i have tests where we have run modules on both 4,8V and 5,7V and there wasNO increase in heat in the module...
Old 09-27-2011 | 09:34 AM
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Default RE: LiFe and ignition

Not me, but if you can get Jody involved, we'd all like to see that.
Old 09-27-2011 | 01:38 PM
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Default RE: LiFe and ignition

All you need to know. Read it for yourself: http://www.cncengines.com/rcexelcdi.pdf

II) 6.4 Volt Li-Fe(A123) Packs
2cell Li-Fe(A123) The Volts Max of 7.2
volts. Nominal 6.6 Volts, use a voltage
regulator. Or connects one IN4007 diode
to fall voltage the use.
If engines not highest rotational speed,
Also may directly use


I don't know why this question keeps coming up for the 10 millionth time when you can get the facts straight from the horses mouth. lol. No offense to the OP! I use 1x IN4007 diode in line on the + wire. $0.05 in cost, less than 1g of weight, and chance of failure is almost nil as I've been posting for several years now...

Egan
Old 09-27-2011 | 02:17 PM
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Default RE: LiFe and ignition

Yet another of their documents shows the increases in current consumption
as the input voltage goes up.
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Old 09-28-2011 | 04:50 AM
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Default RE: LiFe and ignition


ORIGINAL: clivemc


ORIGINAL: a1pcfixer

Two other points to consider;

1) Higher input voltage does not equal higher ignition output
(more accurately, we lack the ability to measure the minute increase)
(and such tiny increase does nothing to improve eng operation)

2) Higher input voltage is wasted energy that gets dissipated as heat.
Guess where that occurs?
Have you actually got measured and factual results for the above statements? I would be very glad to discuss it with you,not being funny- we have been doing sometesting and I am not going to post everything here now. We have some more testing still being done and when complete i will postit. However we have seenthat higher input DOES equal higher output, but further testing is in progress. point number 2 you eldude to heat being dissipated i prrsume in the module.Again i have tests where we have run modules on both 4,8V and 5,7V and there wasNO increase in heat in the module...
High er input will result in higher output.
Lower resistance plugs also increases spark intensity. Hence a massive difference in performance between a platinum plug and a copper plug (electrodes)
Hence increased power output from carbon ignition leads over conventional copper.
So I believe higher input onRC CDI will result in higher output at the plug and therefore improved combustion of petrol/gasoline
Old 09-30-2011 | 02:51 AM
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Default RE: LiFe and ignition

Max operating voltage often is specified in an unprofessional way, also for rc components such as receivers and servo's.
For instance,
"Power requirements :4.8V or 4 nimh or"
"6V or 5 nimh or 4 alkaline's"

5 nimh fully loaded can be well over 7V and 4 alkaline's is 6.6 V, so this type of specification is confusing.
Better would be
"Power requirements :4 to 5 nimh or"
"4 alkaline's "
"absolute max continous operating voltage 7.2V"
"minimum operating voltage 3.8V"
Old 09-30-2011 | 03:21 AM
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Default RE: LiFe and ignition



wat u zegt is correct</p>

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