Hi,
I am in the middle of my first gas airplane setup. now i am consider the following options :

1) IBEC + dual batteries and switchs. ( currently i am using dual nicd batteries and switchs on my glow airplanes )
2) Dual batteries for rx + separate battery for ignition + Remote Kill Switch

the IBEC connects to the rx through fiber optic cable but some pepole says that there is still good chance of RFI interferences.

what about remote kill switch ? it's also connects to the rx through fiber optic cable is that means it will also have the same chance of RFI interferences ?

Thanks

Oh brother, here we go

I run optical kills on all my gas planes, no interference.

How big of a gas plane and what type of radio?

i do my best to make it intersting....

the radio is sanwa rds8000 2.4gb, and the engine is 30cc sap-180

what i am trying to figure out is whether there is any difference in terms of RFI interferences generation between those two components

I have a Tec Arrow Ibec on two gassers. It works well , never failed or caused any kind of problem or issue.
Approx 40% of the gasser flyers ( 120 members) of my club use them as well and have had similar ( very positive ) experience.

I have switched some of my warbirds over to one (1) 5000MA Lipo this year and have been test flying this without any problems at all.
If there was any doubt with my baby's well being I would,'t be useing them.
I didn't want to have two different styles batteries (ni-cad/lipo) in the same plane for radio and engine power.
There is a bunch of guys around here with Smartflys that never have any problem doing the same thing.

http://www.tech-aero.net/ultra-ibec

Jim

the reason i am asking that is that although i am far from being RF expert it seems to me that pepole are more tolerant to optical kill switch then IBEC
the question is if it has some logical reason ?

Well, I am far from being a expert on this stuff also and I agree with you that years ago it was "all optical kill" and I was using that technology too. But times have advanced to where people now have a reliable means to eliminate one more battery to charge.
Jim

It's not a question of tolerance.

They are two different devices. The IBEC (Ignition Battery Eliminator Circuit) is what the name implies. It has optical coupling and ignition kill capability. My TechAero IBEC has a built in regulator to reduce Lithium battery voltages to 5.0 volts. It is rock solid. There is no question of RFI. The opti kill has one function only - remote shutoff of the ignition.

So the answer to your question should be obvious. If you are going to continue to run a separate ignition battery, forget the IBEC and get a smart fly opti kill.