Alan Posted February 27, 2011 Share Posted February 27, 2011 I am considering getting a Eflite Extra 32E Like this... My set-up is going to be --Eflite power 32E motor --Hitec HS225MG servos all round --CC Phoenix ICE 75amp ESC --3800mAH 4s Lipo Was also thinking about putting in a seperat RX Battery 1600mAH 2s 7.4v what size of UBEC would i need for this. Also had a look around what would be a decent make of UBEC to buy. Edited By Biggles' Elder Brother - Moderator on 27/02/2011 10:30:42 Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted February 27, 2011 Share Posted February 27, 2011 Alan, please read this Thanks BEB Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted February 27, 2011 Share Posted February 27, 2011 Lucky BEB was on watch this morning If your going to use a UBEC ( which is fine ) then why bother with the separate battery?Many UBEC will quite happily run off 4s Lipos these days. THIS for instance. Quote Link to comment Share on other sites More sharing options...
Alan Posted February 27, 2011 Author Share Posted February 27, 2011 I thought the separate battery would be a better procaution to power my servos. Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted February 27, 2011 Share Posted February 27, 2011 But why? Its just another thing to go wrong, or forget to charge etc. Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted February 27, 2011 Share Posted February 27, 2011 Have you read this old thread Alan - may help with the process Quote Link to comment Share on other sites More sharing options...
Alan Posted February 27, 2011 Author Share Posted February 27, 2011 Then would the BEC in the CC Phoenix ICE 75amp ESC be sufficient enough without a seperate BEC. Sorry for so many Q,s still very new to Electric setupsEdited By Alan on 27/02/2011 11:15:52 Quote Link to comment Share on other sites More sharing options...
David Ashby - Moderator Posted February 27, 2011 Share Posted February 27, 2011 Alan I always run a separate Rx batt (2-cell Life) in my bigger electric models and an E-flite Extra 32e like yours too. Just my preference of course. Quote Link to comment Share on other sites More sharing options...
Alan Posted February 27, 2011 Author Share Posted February 27, 2011 What would be considered a good make BEC. Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted February 27, 2011 Share Posted February 27, 2011 Hard to say really Alan - switching BECs are more efficient, and will generally run cooler than a simple cheap linear version. The downside is that switch mode versions can create electrical noise - usually not a problem - especially on 2.4Ghz gear.I have many different types and brands ( all switch mode ) and haven't had any problems with any of them, including a couple of the cheap GC ones I linked to earlier. Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted February 27, 2011 Share Posted February 27, 2011 Posted by Alan on 27/02/2011 11:15:05:Then would the BEC in the CC Phoenix ICE 75amp ESC be sufficient enough without a seperate BEC. Sorry for so many Q,s still very new to Electric setupsEdited By Alan on 27/02/2011 11:15:52 No apology required...thats why we are here mate Thats a very fine ESC you have there, and its built in BEC is happy on up to 8s LiPo input, and its output is rated at up to 5A so should be more than capable.Personally, I would use it, but.....usual disclaimer applies Quote Link to comment Share on other sites More sharing options...
Alan Posted February 27, 2011 Author Share Posted February 27, 2011 i take it 5amps would be good enough to run 4 hitec servos HS225MG hitect servo spec Not sure what the 5amp meansEdited By Alan on 27/02/2011 17:12:17 Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted February 27, 2011 Share Posted February 27, 2011 Plenty...5A refers to maximum current capability of the BEC.Take a look here for some data on how much current servos use. There are also other threads about the same issue elsewhere on the forum Quote Link to comment Share on other sites More sharing options...
Alan Posted March 26, 2011 Author Share Posted March 26, 2011 Got my ESC today was sent the LITE ICE 75amp instead this should still be OK, the only thing I noticed was the manual stated that if you are uing over 3cell lipo's you should use a separate BEC but also say's that the max current capabilty of the BEC is 5amp. PDF for all CC ESC Should this still be OK or should i put in a seperate BEC. Thanks Alan Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted March 26, 2011 Share Posted March 26, 2011 Dont use the inbuilt bec if you are using over 3 cells.Maybe this thread might be worth a read Quote Link to comment Share on other sites More sharing options...
Alan Posted March 26, 2011 Author Share Posted March 26, 2011 But the spec say 5amp capabiltiy I thought that would be plenty for 4servos. Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted March 26, 2011 Share Posted March 26, 2011 It is, but the problem is that the BEC is only designed to take a maximum input voltage of 3s lipo ( or equivalent nickel ) I think you need the PRO version if you want to use higher cell counts and the inbuilt bec.Edited By Tim Mackey - Administrator on 26/03/2011 11:01:14 Quote Link to comment Share on other sites More sharing options...
Alan Posted March 26, 2011 Author Share Posted March 26, 2011 What would you class as a good BEC so many different types and makes not sure what to go for. Quote Link to comment Share on other sites More sharing options...
Alan Posted March 26, 2011 Author Share Posted March 26, 2011 Found a BEC on ebay TURNIGY 3A UBEC with Noise Reduction was wondering if this would be good enough to run 4 analog servos. Alan Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted March 26, 2011 Share Posted March 26, 2011 Yup - I use them all the time. Quote Link to comment Share on other sites More sharing options...
Alan Posted March 27, 2011 Author Share Posted March 27, 2011 Posted by Tim Mackey - Administrator on 26/03/2011 21:56:07:Yup - I use them all the time. Thanks was not sure about the make and did not know if 3amp would be sufficient enough. Alan Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted March 27, 2011 Share Posted March 27, 2011 Plenty of evidence ( real world not theoretical ) to show that servos use far less than many people think in flight. My latest example is the flight data recorded on my short lived, fairly large 12lb+ PC9. Servo current consumption never passed 800 m/amps during the whole first flight, and only 600m/a on the second - data for which is shown here. Here's the data from the first 6 minute flight. Ignore the first three minutes - she was parked. We have discussed this matter a few times....such as HERE And HERE Edited By Tim Mackey - Administrator on 27/03/2011 11:17:34 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.