Flying a super cub by the numbers in that kind of way seems like a novel idea! They certainly get off the ground bloody slowly with a bit of flap and lots of stuff seems to happen around or below the bottom of my ASI which is at 40 kts. As Kingy says, ground effect is important and one rough field take-off technique is: on the brakes, full power, stick fully back, brakes release, count three, stick fully forward, count three, full flap, pop into the air, bleed off second stage of flap as airspeed increases. Actually, best angle of climb is full flap at about 45mph and 45 degrees, God help us. I've yet to do it!
The approved POH for super cubs is notoriously non-existent and has very little info in it. The battery, according to page 23 of the Univair owner's manual (which isn't the POH), is 12V/33A, but frankly who cares?
The place for super cub info on the net is
www.supercub.org.
QDM