The LT-40 ( which is a GREAT trainer BTW ) is a 6lb .40-.50 sized plane.

For that plane you really want an engine of about 1 to 1.2 HP at LEAST.

Since 1 HP = 745 watts, assuming a best case (lowest) power demand...

745w / 11.1v = 67A which is far more than your packs can produce without harming them.

However you could use two identical 3200mAh 11.1v packs together to effectively produce a single 22.2v pack...

So....

745w / 22.2v = 33A which is under 11C for your packs.

Assuming your packs are 20C, this will not overtax your packs and should be enough to get an 8 minute flight or so more.

You'll need an ESC capable of around 70A under 11.1v or 40A under 22.2v with either an on board switching BEC (UBec) or a separate UBec.

Assuming a 12x7e prop spinning around 10000 RPM or so

11000 / 22.2 = 495 ( or approximately 500 KV )

So you'll need:

- an 800 watt or better 500KV motor
- An ESC rated to at least 40A at 22.2v ( carefull with this! ) with an on board switching BEC.
- If your ESC does not have a UBEC, then you'll need a separate switching BEC
- 12x7e prop or 13x5e ( the latter to slow the plane down a bit while giving it more vertical thrust ).
- A 3S to 6S connector to make your two 3S packs behave as one 6S pack.