When I built the first DC-10 I was worried about this also...

So I did some testing... I put a volt meter at the servos and also check the current at the battery...

The most current I could pull was ~4 amps only for ~0.3 sec... If I stalled a servo its current draw was
not as high as if the servo was going full speed one way and changed direction. This load was much high
than stalling all the servos.

The big plane had

2 x Big Red Digital 260 oz servos
6 x Red Digital 100 oz servos
3 x standard servos
and the wire length for the many of the servos was around 6 feet.

After testing everything over and over I concluded, with big enough batteries and with 5 cells
there was no need for any thing else....

The current draw was just not high enough, for long enough
that the bus in the receiver could not handle without getting hot.

One thing that helped a lot was using 2 batteries packs. This cut the internal resistance
of the batteries in half and kept the voltage high during load.

For any jet I would recommend 2 x 5cell NiMH 2000 AA... These two packs are all
that is needed for any jet... Each pack cycles at ~1900 mah @ 2 amp load
and will give over 3800 mah tested. I ran the Rig for over 4 hours in the shop
with a pack like this... And remember is only AA cells.

It mostly depends on how many servos you have in your plane...

Now.. I only tested Multiplex servos.. Maybe JR digitals pull more current...

Hope this helps...

Eddie Weeks
http://www.corpcomp.com/weeks1/