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receiver and ignition sharing same battery

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Old 07-29-2016, 09:32 AM
  #1  
slo642
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Default receiver and ignition sharing same battery

could there be interference or a problem if the receiver and ignition share the same battery on a gasser
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Old 07-29-2016, 12:47 PM
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No

I have several hundred flights in several airframes in that configuration. The best way to accomplish it is with a tech-aero IBEC but two leads and switches works just fine.
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Old 07-29-2016, 01:22 PM
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Never, never and never. You loose the battery and it's time or the "Fat Lady" to sing..................
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Old 07-29-2016, 01:25 PM
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LOL

We will have to agree to disagree but like I said, I have many many flights that way and I have my hands on a lot more airplanes per year than the average modeler. I average one or two new gas plane builds per month
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Old 07-29-2016, 03:05 PM
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If you loose the Rx battery you're dead either way,, the ibec doesn't make that more likely , I too have run a single battery set up on several planes,, never a problem
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Old 07-29-2016, 03:16 PM
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Ditto. Tech-Aero Ultra IBEC is the way to go.
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Old 07-29-2016, 03:25 PM
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I Run separate batteries, eliminates the ignition module from going bad and taking out the only battery
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Old 07-29-2016, 04:47 PM
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For a cheap (about $6.00) HK 1100 ma Life ignition battery you want to risk it? I also have gotten away with things I shouldn't have, that why we make choices..............not to say mine are always the best
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Old 07-29-2016, 05:16 PM
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Personally, I think a $6.00 battery is a higher risk than a Tech Aero IBEC. First, I will never fly a gasser without a kill switch, which the Tech-Aero IBEC has, and pretty sure it has a current limiting circuit...should the ignition module fail...the engine will quit anyway...so you won't be in the air very long... but there will be enough battery to land...runway or otherwise. I could go through the count of my flying hours and number of planes...all with a Tech Aero IBEC and single LIFE battery, but the count doesn't really matter in the over all...it's just the best (not the only) way to go...fewer components to fail.
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Old 07-29-2016, 05:20 PM
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+++Tech-Aero Ultra IBEC!

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Old 07-29-2016, 05:39 PM
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When is the last time you saw an ignition run away and "take out" a battery?
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Old 07-29-2016, 07:38 PM
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Actually, the only ignition module I've see fail did just that...it died and so did the engine...no huge current draw...no current draw at all. The ignition module failing and draining the battery is the argument used against dual use of a single battery...probably has happened, but I've never seen it. I guess I was skeptical at first so I tried it on a test plane and it worked...for me...so as I built new planes, the single battery and Tech-Aero IBEC is all I use. In fact, I don't even use a mechanical switch for the ignition...just the IBEC plugged into the receiver. That's just MY experience...others may have experienced less than wonderful results...

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Old 07-30-2016, 03:35 AM
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When is the last time you saw an ignition run away and "take out" a battery?
Andy,, that would be never,,,

Originally Posted by Murphey View Post
Actually, the only ignition module I've see fail did just that...it died and so did the engine...no huge current draw...no current draw at all. The ignition module failing and draining the battery is the argument used against dual use of a single battery...probably has happened, but I've never seen it. I guess I was skeptical at first so I tried it on a test plane and it worked...for me...so as I built new planes, the single battery and Tech-Aero IBEC is all I use. In fact, I don't even use a mechanical switch for the ignition...just the IBEC plugged into the receiver. That's just MY experience...others may have experienced less than wonderful results...

M
Same here,, no second battery, no need for a second switch
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Old 07-30-2016, 08:40 AM
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Originally Posted by Murphey View Post
Actually, the only ignition module I've see fail did just that...it died and so did the engine...no huge current draw...no current draw at all. The ignition module failing and draining the battery is the argument used against dual use of a single battery...probably has happened, but I've never seen it. I guess I was skeptical at first so I tried it on a test plane and it worked...for me...so as I built new planes, the single battery and Tech-Aero IBEC is all I use. In fact, I don't even use a mechanical switch for the ignition...just the IBEC plugged into the receiver. That's just MY experience...others may have experienced less than wonderful results...

M
Murphey's law right?

Sorry I couldn't help it....
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Old 07-30-2016, 09:34 AM
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Here's what Futaba has to say about the subject. Dan.

Guidelines for setting up gasoline engine models. All ignition equipment, including an electronic kill switch, must be mounted at least 12", and preferably 14", away from all radio equipment, including throttle servos, etc. Ignition kill switch should always be on opposite side of fuselage from radio kill switch. All pushrods going to anything related to the engine must be non-conductive (just nonmetal clevises is not sufficient).
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Old 07-30-2016, 10:02 AM
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Yep, and they said that in 1927 when the radios were equipped with tubes and escapments.
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Old 07-30-2016, 12:11 PM
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Originally Posted by All Day Dan View Post
Here's what Futaba has to say about the subject. Dan.

Guidelines for setting up gasoline engine models. All ignition equipment, including an electronic kill switch, must be mounted at least 12", and preferably 14", away from all radio equipment, including throttle servos, etc. Ignition kill switch should always be on opposite side of fuselage from radio kill switch. All pushrods going to anything related to the engine must be non-conductive (just nonmetal clevises is not sufficient).
Yeah,, the question is why?

Been flying my Ziroli 70" P-47 on one battery for 3 years,, including last weekend

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Old 07-30-2016, 12:29 PM
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My latest ARF is equipped with one excellent life battery, two switches and an ignition kill switch operated by the transmitter. The whole set up is recommended by the ARF distributor who has a huge experience and excellent reputation with gas engines. It works great!! I agree with Barracuda Hockey, some are following recommendations made on the basis of out of date technology.
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Old 07-30-2016, 06:12 PM
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Guess we need to tell Boeing, Lockheed and others that redundant systems are no longer needed?
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Old 07-30-2016, 06:49 PM
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GIZMO: Actually, separate ignition and receiver batteries and switches aren't really redundant...one can't work in place of the other.
I'm not saying the dual use (not redundant) system is right for everyone...but is has sure worked for me. The nice thing about this hobby is that one is free to do it this way...or follow the Futaba way...the choice is yours.

Andy: Yes Murphey...as in "Murphey's Law"...look it up in the dictionary...you'll see my picture!
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Old 07-30-2016, 09:25 PM
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Originally Posted by Gizmo-RCU View Post
Guess we need to tell Boeing, Lockheed and others that redundant systems are no longer needed?
I'm hoping that is sarcasm since I would never say that. When you consider that every time one those jets leaves the ground, 200 people(or more,on average) are being carried on them. For those that have never seen a jetliner under construction, it's amazing how much aluminum, wire and all the other materials that are needed to assemble one. Even more amazing is the amount of labor and knowledge goes into that construction as well.
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Old 07-30-2016, 09:46 PM
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I'm not sure it's been made clear to the OP that some kind of electrical isolation is necessary to be able to use a single battery for both the receiver and ignition. If you use a dual output plug switch and just run one to the receiver and one to the ignition, you will probably have interference problems. The aforementioned IBEC works just fine, as does an optical kill switch.
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Old 07-31-2016, 03:02 AM
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Tech-Aero Ultra IBEC all the way for years now! Flawless record and never have to bother with a slew of batteries all over the place. One of the absolute best moves I ever made was getting rid of ignition batts.
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Old 07-31-2016, 04:01 AM
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Originally Posted by jester_s1 View Post
I'm not sure it's been made clear to the OP that some kind of electrical isolation is necessary to be able to use a single battery for both the receiver and ignition. If you use a dual output plug switch and just run one to the receiver and one to the ignition, you will probably have interference problems. The aforementioned IBEC works just fine, as does an optical kill switch.
You might think that yet that is simply not the case.

IBEC's aside, I have many hundreds of flights on planes with two leads coming out of the battery, one going to the ignition, one going to the receiver, it's not a problem.
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Old 07-31-2016, 04:44 AM
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It's all about comfort level I guess. I feel comfortable running two batteries, 3 actually 1 ignition and 2 for the aircraft through a smart fly board.
If your ok with one battery then fly your airplane with one battery
of all the things in the world to get in a pi**ing contest over this is pretty minor
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