flyrotary@lancaironline.net Mailing List Archive

Message

I am trying to calculate battery size and reserve for my installation, does anyone have data on operating current draw for the following:

EC2 with GM coils and Mazda injectors.

Fuel Pump

Starter current.

Hi Joe,

Here is some data that I collected from the old RV-3. At one point, I know I measured the starter current, but can't find it anywhere.

Rusty

NOT RUNNING:

Fuel pump 1- 6.2 amps

Fuel pump 2- 6.0 amps

Facet transfer pump- 1.1 amps

Davies Craig EWP- 4.4 amps

EC-2 (also ignition coils)- .3 amps

EM-2- .6 amps

Master switch only- 6.4 amps (what is all this?)

Radio (receive mode)- .7 amps

Transponder- .5 amps

CD player- .3 amps

RUNNING:

Minimum config includes FP-1, EWP, EC-2, EM-2, and of course ignition coils. Alt is turned off because the master is off. 12.1 amps at 1500 rpm, 14.1 amps at 3000 rpm. That was as much as I dared run standing next to the plane, using the meter on the battery cable in the baggage compartment.

Max load, as I normally fly, includes everything. Alternator is off though, because I couldn’t measure the load at the main battery lead with the alt supplying power- 22 amps at 1500 rpm.