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Old 10-25-2020, 01:11 PM
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New to giant scale- BEC vs. Rcvr battery?

Hi all, first post here and new to giant scale, but decades of full-size flying and RC slopers. I'm getting a Hangar 9 Valiant 30cc powered by 10S LiPo, and the ESC I'll be using doesn't have an internal BEC. I'll need to power 7 digital servos, and I'm not sure if it would be best to get an external BEC or a dedicated LiPo receiver battery. Thoughts? Also if I do get a receiver battery, what mAh would be appropriate for this application? Thanks!!
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Old 10-25-2020, 01:28 PM
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I have done both.. I prefer the external bec as if the plane sits a a while you don’t have to worry about yet another battery.. I like the gryphon bec and have also had a couple of the castle ones that have all worked., That said a couple of heavy duty switches and a pair of 2500mah Lipo is cheap and would work fine too.. if using batteries I always run two batteries and two switches.. nothing fancy.
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Old 10-25-2020, 02:34 PM
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I am no expert at electric planes but 2500mah seems like a one to maybe three minute flight.
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Old 10-25-2020, 03:34 PM
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Quote:
Originally Posted by Festivus View Post
I am no expert at electric planes but 2500mah seems like a one to maybe three minute flight.
I think he means for the receiever packs.. if that is the case 2 2500 mah packs will last all day plus on a plane like that.
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Old 10-25-2020, 04:40 PM
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Ok like I said no expert the only nongas planes I see at my field use one or two batteries and power the servos off of the same batteries by the esc
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Old 10-25-2020, 08:51 PM
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Which is fine right up to the moment when the esc goes kaput.
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Old 10-25-2020, 09:19 PM
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I have flown for a lot of years and looking back at inflight failures--a receiver, a couple of servos, 3-4 batteries quitting and a couple of switches that failed.. so i figure redundancy on the switches and batteries is the cheapest insurance. I do have one of my turbines that has been flying with a gryphon regulator running off the turbine battery for 5-6 years and a whole bunch of flights.. lots of the turbine helicopter guys run them with no problems. a lot of their models run upwards of 10K so they have a decent reputation. For a small simple plane like your valiant.the easiest is use a 2s lipo or LIFE and HV servos..but it is something else to charge. and as I said i would run 2.. batteries and switches are cheap.
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Old 10-27-2020, 09:22 AM
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My 30cc planes get 2 small receiver packs and a wolverine switch, or 2 small packs , two small switches and a smart fly batt share. If a BEC fails you still crash. I'm trying to be safe and redundant. My 30cc laser has two 1300mah packs and a wolverine. 50cc has two 2500ish packs. My pattern planes have only two 450mah packs and still can last multiple flights. PM me for any more questions
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