View Full Version : Lipo to heavy on T-rex 450se suggestions

11-18-2007, 03:49 AM
Just bought AT 2200 25c Lipo. I have the battery mounted on the front mounting plate as far as it can go. Still tilting forward. Any suggestions on what kinda of weight I should put on the tail to even it out. Or maybe some other mounting positions.

11-18-2007, 03:54 AM

11-20-2007, 04:43 AM
could you possibly mount underneath?
or add gyro to back

11-20-2007, 05:17 AM
The battery is too big, it hits the main gear. think I'm going to make a new vert fin to even the weight out. Thats the only thing I can come up with.

11-21-2007, 06:22 PM
I have a similar problem with my machine when I change canopies or from skids to floats and the CG changes.
Fortunately the tail fin is attached by a clamp and I can slide the fin back and forth to get the CG perfect whenever I change to other configurations.
This method works out very well and I wouldn`t see why making another fin wouldn`t work for you.

11-27-2007, 05:09 AM
I'm using the same battery.

Here's where I put everything. The ESC is on the side near the CG. There's a BEC under the fuselage.

Some have placed their tail rotor servo further back on the tail boom. For those who have built their tail rotor pushrod out of carbon fiber, it's a modification that's not too difficult.

11-28-2007, 12:44 PM
If you leave the battery where it is, and can't move the gyro or any other part closer to the tail then you will have to add extra weight to the tail to counteract the extra weight at the front.

Wouldn't adding extra weight to the tail require extra power to fly, making the larger battery size pointless?

I have found that the FlightPower 2170 is a great size battery for the Trex http://rc3d.co.uk/flightpower-evo252170-p-96.html

12-07-2007, 08:01 PM
I've had no problem with my batts placed in the same place as you. In fact that is the recommended placement for CoG during rotation (rolls, flips etc)
I use 2100 & 2170 3cell li-po's, I've even flown using 1200 3 cell (go's like a bat out of hell-if only for 3mins:Q-less weight equals more performance)
All the TREX flyers I know position the batt as you have done, putting it beneath on base tray moves the CoG into the wrong area & creates a pendulum effect.