One battery for rx and ignition? - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-01-2012, 04:16 PM   #11
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Re: One battery for rx and ignition?

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I think you will find that the main reason for using two batteries is to separate the electrical system for the ignition from the radio/servo system in order to prevent ignition noise from entering the control circuits, that is why we use an optical kill switch so that there is no electrical connection and keep the igniton and control system wiring as far apart as possible.
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Old 01-01-2012, 05:04 PM   #12
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I normally use a seperate ignition battery but with my latest gasser (30cc) I'm going to try the IBEC from Thunderbolt RC. If it works ok I might consider it on my larger 50/100cc, but the weight of a 1100mah pack is so marginal that I truely don't see a huge benefit on the larger planes other than quicker charge turnarounds.

I still use 2 batteries (2300 mah A123) / switches on all my gassers for redundancy for the receiver. The power draw on the ignition is minimal and on my 1100mah A123 packs I barely put back in 500 mah after 5 12 minute flights. I'm the same as you and with digital servos I use a smartfly expander board for peace of mind and never experienced a brownout with the setup.
RV-8'ting and loving it!!
**Trout Farm Flyers**
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Old 01-01-2012, 05:06 PM   #13
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Re: One battery for rx and ignition?

thanks all for the input, I went with the tried and true system with 2 batteries/switches/regulators. Weight and room were not an issue in this airframe which made the decision easier as well.

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Old 01-01-2012, 05:35 PM   #14
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Re: One battery for rx and ignition?

I'll be trying a IBEC this comming year on a 2.4 system. Been reading a lot of posts on RC Universe about IBEC's this past year and opinions are varied but overall they seem to be alright with 2.4. I guess the only way to find out for sure, is to use one and see what happens. There will be a lot of ground testing before the first flight. If there is any indication of a problem it will be simple to take the IBEC out of the system. My objective is not to save weight but to have one less battery to service and simplify the system. Batteries have always cause me the most problems and the fewer packs I have to watch and servce the better I like it.
I guess everyone has to do what they are comforable with, but if you don't try something different you never progress.
Happy New Year to all.
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