is the falcon 3d a 400 sized heli

yes

thank u

would it be posiabel to carry those electronics over to a t-rex 450?

no the trex and the falcon use diffarent types of ccpm ( collective)

And trust me you won't want to use the falcon's electronics in a T-rex even if they did work, they are more suited for RTF work.

How do you determine what kind of CCPM a heli has, and what are the different kinds ?

Thanks,
Don

Mechanical CCPM and electronic CCPM. Mechanical CCPM has a "elevator" servo, "aileron" servo and collective pitch servo. The elevator and aileron servos are connected to the swash at 90 degrees and the three functions are "mixed" to the swash plate though mechanical levers in the heli.

Electronic CCPM has all three servos connected to the swash (either directly or indirectly through levers) at 90 or 120 degrees (evenly spaced) and two or three servos may move at once for a single function rather than having a single servo for each function. For example, for elevator movement all three servos in a 120 degree system move together to tilt the swash plate forward or backward.

Here's a pretty good explanation:
http://www.iroquois.free-online.co.uk/ccpm.htm

I'm not even sure if the Falcon is CCPM at all. In the pictures I've been able to find I can't see how/if the collective is mixed with the cyclic controls, or if it's separate. If it is CCPM, it's mechanical, not electric.

it's mechanical ccpm... which is why the co-pilot CP4 works with it and not the eCCPM helis... I was looking at teh falcon for a while.. even read the HUGE thread here and at rcgroups about the falcon... then decided I really didn't want it.. just ordered a BlackHawk 450SE from Ka-Planes.com it should be here this week