My scratch build rc plane after taking off went inverted and crashed what would be the problem???
Is it tail heavy??
And i had checked the CG,it was all right
Anybody help please😥

Many possibilities.....
Could be a thrust angle problem, Could be an Elevator design problem, the elevator could be uptrimmed or the linkage may have been loose, or it also could be a wing incidence issue.
Pictures will be helpful. A video will help even more in narrowing down to the root of the problem.
Regards

Quote from: Ashish848 on March 09, 2019, 10:53:27 PM
My scratch build rc plane after taking off went inverted and crashed what would be the problem???
Is it tail heavy??
And i had checked the CG,it was all right
Anybody help please😥

This is like telling a doctor "I don't feel well", and expecting him to diagnose!
It's possible, but
You need to explain the symptoms.
1.Did it roll right into inverted?
2. Did it roll left into inverted?
3. Did it loop into inverted?
4. Did it bunt into inverted?

We also need to know details of the model
1. Is it a tractor, pusher, motor at nose or above wing etc
2. Wing span, wing loading etc
3. Details of motor, prop etc

Common reasons for going inverted and crashing on takeoff are
1. Tail heavy
2. Applying too much up elevator
3. Tip stall

Assuming the design was ok and the pilot was competent!

Pl post a video if possible.
Else at least post pics of the model, and details of size and electronics.

An initial failure is not the end of the world.
You'll soon taste success!
Regards

When i fly my heli, i need to add some initial aileron at take off. Similarly, i suppose you need to counter the rolling moment during take off. And up elevator only after getting some speed. Just my 2 cents. Having flaps also helps . And my scratch built also need some aileron/rudder and elevator inputs during launch

Its wingspan is 1500mm
Chord length is 170mm
It has 1000kv motor with 10×4.5 inch prop
Weight is about 700 grams

I'm attaching a link with full description to the kit

http://www.vortex-rc.com/product/vt-allrounder-v4/

Link to  crash video

https://drive.google.com/file/d/1-1ZkGicCYJ0MbI3UoZXT46kI_oBsTXHJ/view?usp=drivesdk

Wings flat! Forgot the polyhedral angle of the wingtips? 
Hence lack of inherent roll stability.
Also probably tail heavy and/or too much up elevator input.
Hope the tall grass prevented damage.

@ashish848,
I've moved your post and replies to a separate thread with a more appropriate heading...

@Ashish848,
Guess you're either too busy, or not really interested.
Discourages attempts to help!
Best of luck anyway...

u don't know how to fly learn first using simulator  .

it seems you are on 3S and very large prop.

Try to either use small prop or go to 2S.

There is a lot of tall grass, try to throw and trim. because you plan climbed too much and went to right,

It should fly straight.