My electric seems to hit more bugs than my I.C. airplanes so the electric plane actually weighs more at the end of the flight CG more forward. 

linheart

Jim,
Of course the batteries get lighter as the flight progresses. By this I refer to

E=mc². where "c" is the speed of light, ~(3*10⁸) m/s.

For example, my Super Clown uses ~1800 mAhr's of current at an average battery voltage ~10.5V during the flight. This equates to an energy usage of 18.9 Watt-hrs, or 68000 Joules of energy.

So the decrease in mass would be (solving for m in the equation) 68000 J/(3*10⁸)² or about  1 nanogram.

I was wondering why the plane felt so sensitive in the cloverleaf!

No electrons were created or destroyed for this post.

Good answer Alan!!! 

Phil,
I don't know if you are refering to my post, but as I say at the end, no electrons were created or destroyed! That's conservation of charge! So you are agreeing with me, and I with you.

Actually, and I am serious, the mass change is due to the fact that energy does weigh something!

Alan,  E=mc2 describes what happens when mass is converted to energy.  A battery does not convert any mass.  Shades of cold fusion!  In a battery chemical potential energy is turned into electricity with no loss of mass, not even a nanogram.

A chemist colleague once told me that every change of energy in a chemical reaction involves a change in mass.  Isn't a charged electron heavier than a discharged electron?  Isn't it a matter that electrons leave the battery heavy and return light, to pick up more mass before making another circuit?