BECS and regulator info ( beginners )

The bec from the ESC  MUST be disconnected ( snip /remove the red wire ONLY ) if using a standalone BEC.

I splice the BEC input wires into the ESC battey input wires, so it gets powered up as I connect the pack, but cannot be accidentally left connected and drain the battery. 

Jet may know what wing fences are but I for one was pleased to have it explained because I had no idea. Also the reason for the saw tooth leading edge on the hunter was of use.

Thanks Eric. 

Can I just add my reccomendations please for 2.4ghz users?

On applications using over 3s [11.1v], or over 3 servo's, either a UBEC set at 6v output, or at minimum, an ESC/Switchable type. Our experiments have shown that brown out's can only be avoided totally with these options.

Sorry to disagree - been using UBECs on 4.8v and up to 8S for more than a year now with no 

"brownout" - using up to 5 normal servos or 4 digital.

So why should I need 6v provided the UBEC is rated for the current drain?

Hi there - does this apply to Futaba 2.4g? I intend to use a Turnigy 60a UBEC with 4 standard servos and 4S power.

Haven't flown yet but static tests seemed fine

Timbo,

On your post 02/04/08 (14.23) about a loud lo-volt alarm for the DX7 you suggested there'd be a followup, can't seem to find it can you point me in the right direction please?

Is this what you are after.?

if you want the detail - then message me with your email address so I can email the zip file to you

Timbo

Thanks for the info on the DX7 

Just discovered your Forum some excelent information..

Perhaps you could confirm my suspicions on my latest wipe out. I had constructed a blue foam Spit', plans off an internet site I exspect you have seen, it wieghed about 1.5 lb.

I used a small bell motor brushless with a 15A controller with a 2amp BEC, Esky reciever and 3, 8g servos.

Now I have not flown for some time, but the flight was exceptionaly eratic untill the crash! It seemed  like a radio problem but looked as though it was OK on static tests.

I made up a 12v pack of 1500mah NIMH AA cells for the power supply, it was this weight I think was responsible for the wreck.

Was the Bec not upto it? reading your posts it seems it may not have been. I am reluctant to try again before I get to the root of the problem. 

Thanks DB 

Hi there and welcome aboard - most small brushless ESCs are only really happy on 2 - 3 s LiPo as a maximum for BEC purposes, and as 3s LiPo is nominal 11.1V this could well be your problem.

How many cells did your pack consist of? 12V could mean nominal ( 10 cells ) or peak ( 8 cells )

Thanks for your reply. It was a 10 cell pack of 1500 mah AA cells.

thanks DB

Ah well then in that case I reckon thats the likely problem.

10 nixx cells fresh off the charger will be around 15Volts! and the small 15A ESC BEC will not like that at all

I liked the look of the Seagull AT-Texan reviewed in RCM&E June issue and as the guy at the shop said that my waiting for use EnErG A3615-4 1600RPM/V and JETI Advance 40 plus would be a good match the cash just flew out of my wallet. Having learnt that I was misinformed I have now bought the recommended JP C42-20 900KV and intend getting the recommended 4s battery.

I have read that above 3s an OPTO type ESC should be used and accordingly was hoping to employ a yet unused JETI Advance 70 opto plus together with SBEC-5V.