Phil Taylor Posted September 5, 2018 Share Posted September 5, 2018 Hi All, Does anyone know if it is OK to use a UBEC for powering the receiver and servos as well as an ignition system (Saito FG14a)? I have a Dr Mad Thrust (?) 5/6v UBEC which has a switchable output for auxiliary items. I would like to use this to power the ignition system (good safety as I can use it as an engine kill) - is that OK? Quote Link to comment Share on other sites More sharing options...
Former Member Posted September 5, 2018 Share Posted September 5, 2018 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Phil Taylor Posted September 5, 2018 Author Share Posted September 5, 2018 OK - thinking of using a 7.4v 2100mah Lipo. Using that with a direct feed on a FG17 and it only takes about 500mh after about an hours flying and about the same for the radio on my Seagull Moth. I was more worried if it would cause any interference? Quote Link to comment Share on other sites More sharing options...
Colin Hooper Posted September 5, 2018 Share Posted September 5, 2018 I have been using a Ubec on petrol engines to power Rx and ignition for a number of years. I power from a 2200mAh 3 cell lipo. This has proved to be very robust and I have never known the battery to be depleted to less than 60% even after 6 flights of 10 minutes each. This setup has been used on warbirds with electric retracts as well without issues. On smaller models, my lipo is a 1300mAh 2 cell which is easier to install. I have had similar results when checking the level of charge at the end of the day. Quote Link to comment Share on other sites More sharing options...
Phil Taylor Posted September 5, 2018 Author Share Posted September 5, 2018 Thanks Colin - that puts my mind at rest - and makes installation a lot easier! Cheers Quote Link to comment Share on other sites More sharing options...
MattyB Posted September 5, 2018 Share Posted September 5, 2018 How many amps can your UBEC supply? You may want to test that with a variable dummy load.... Quote Link to comment Share on other sites More sharing options...
Phil Taylor Posted September 5, 2018 Author Share Posted September 5, 2018 Hi Matty, it’s a 2A 5v output and the rating on the ignition system is 600mh so hopefully it will be ok. Unfortunately I don’t have any way of testing the draw of the unit. Good point though . Thanks for the input 👍🏻 Quote Link to comment Share on other sites More sharing options...
Colin Hooper Posted September 5, 2018 Share Posted September 5, 2018 My preferred ubec for 20cc, 35cc and 55cc models comes from Hobbyking. Look at part no. TR-UBEC15. It has an 8A output which will burst to 15A for a short time. Possibly overkill but it is easily accommodated within the fuselage. Quote Link to comment Share on other sites More sharing options...
MattyB Posted September 6, 2018 Share Posted September 6, 2018 Posted by Phil Taylor on 05/09/2018 21:08:07: Hi Matty, it’s a 2A 5v output and the rating on the ignition system is 600mh so hopefully it will be ok. Errr, no, not really! Individual servos can pull 2A, especially if they are fast ones (contrary to popular belief digital servos don’t always pulls the most current, but all high speed servos seem to). 2A BECS are really only suitable for parkflyer electrics IMO. That supply might be ok for the ignition alone, but do yourself a big favour and forget running the RC off it - that needs a separate power supply that is definitely up to the job. Given you are running a petrol engine the extra weight of a small 4 cell NiMH or better still a 2 cell LiFe should be insignificant. Edited By MattyB on 06/09/2018 21:31:45 Quote Link to comment Share on other sites More sharing options...
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