acdii

Going to have 3 S3004, 4 S3010, and one Hitec retract servo along with a gear sequencer. I want to get a BEC to use with my 3300mah 3S Lipo to run it and the gas ignition, so I need to know what kind of amp draw I can expect off this radio setup. It is going into a warbird, so no fancy stunts, other than high speed passes.

acdii

oh, forgot to mention, 8 channel RX also.

Skaluf

You should be able to get around ten flights with that setup. This depends on the size of the air plane though.

Steve

BuschBarber

My Feedback: (2)

Why not hook up a Wattmeter or an H9 Current Meter, between the Rx battery and the BEC, run all the controls, and see how much current you are drawing. You can also do this between any individual servo and the Rx.

acdii

I dont have a BEC yet. I need to get an idea what the amp draw could be so I can order the correct one. Locally I can pick up a 3 AMP bec, but I dont think that will be enough.

BuschBarber

My Feedback: (2)

I use Castle Creations BEC's. They have a 10a BEC and a 20a BEC Pro. I use the BEC Pro as a Voltage Regulator, with a separate LiPo Rx battery, in one of my aerobatic planes. It is electric and has a separate motor battery. The aircraft is large enough where the extra battery weight is not significant. I have other aircraft that use unregulated LiFe Rx batteries.

acdii

BuschBarber

My Feedback: (2)

I have never measured the current draw of the Ignition Module on my DA50 or Fuji 32ei. I would guess that it is less than 10a. I was more concerned about the current draw from all the Digital servos. Some Ignition Modules only like 4.8v, so you end up using a Voltage Regulator or BEC even with LiFe.

acdii

Well, after reading up on the DLE20 ignition, I discovered it works best @ 4.8v, so foregoing the BEC, going to get two separate packs instead, a 4.8v and LiFe for the RX.  Probably a 1000mah 4 cell and 1800 mah for the RX, or whatever I find close to those ratings. 

Flyfast1

My Feedback: (1)

There are also those BECs designed to plug into the receiver and provide power to the gas ignition from the receiver batteries. I think Troy Built sells them and I have only seen favorable comments on them. I am considering this for my current warbird build and using LiFe batteries for the receiver.

-Ed

pilotpete2

Hi Ed,
That's called an IBEC, it also provides an opto coupled ignition kill function and the new version of the Wike IBEC from Troy Built Models has an adjustable output for the ignition[8D]
Pete

acdii

Picked up a pair of packs, 4 cell 2000 mah nimh and 1800 mah 5 Cell nimh, This should be a good start for now, can always add a bec and life later, but for now I can get the radio working and balance out the plane.