NEXA T6 Texan

[LesHurricane]

I need help with the C/G on my T6...
88mm makes it very nose heavy...
Won't launch without nosing over (grass)
plane won't go airborne without doing a left side cartwheel...
4250-800KV with 13X6 prop & 3700mah 4s
Need some information on what to do

[xviper]

Nosing over on take off roll is not necessarily a CG issue. This is more likely the typical tail dragger issue. This has been discussed in other threads involving tail draggers. Taking off without nosing over or tip stalling needs the use of certain techniques and practice.
Use high rates on the elevator so you can apply full UP elevator and a sudden "blip" of the throttle to get the rolling started. This keeps the tail on the ground and also provides some steering capability until the air rudder has enough air going over it for directional control. Once the wheels have overcome the friction with the ground and the plane starts to gain a bit of speed, you need to let off on the elevator carefully and resist giving too much throttle. Try to keep the plane rolling on the ground until the wings have enough airspeed to actually fly and the ailerons have enough control. Allowing it to lift off too soon is what causes the tip stall and subsequent cartwheel. Don't let it climb at too steep and angle.
If you look at videos of almost all DC3's, no matter the size, you will see this tendency to tip stall. The smaller the plane is, the more likely it will nose over, so the more it is necessary to have lots of elevator and throttle blipping to get the wheels moving. Grass makes it far worse. It's the nature of these tail draggers and not a CG thing. Set the CG too far back and the plane will fly like a roller coaster and will be hard to manage.