MFE Believer - Auto TakeOff failure. My fault!

Did exactly the same thing this weekend on a maiden flight delta wing. As it left my hand I knew it was not going to make it. Just not enough airspeed and TKOFF_THR_SLEW was too long

one thing i noticed, as you threw it, the tail started twisting which wouldn't help with roll.. you might wanna do what I do with my mini talon and put a small 2mm carbon rod between the two tails... stiffens it up nicely

Could you please do a review of the zeta sky observer it is a big fpv plane from Aliexpress I want to get one but there is almost no information on it besides a quick build from hobby King that hardly shows any detail about the building process and the parts included I am sure many other people that also want to buy it would appreciate the video :)

Had the same problem with our Believer. More likely is that you had too steep of an throw angle. We found that an almost parallel to the ground throw gets her in the air best. I also do the fake throw to get the motors spinning and we even did the last flight with it at around 90% throttle for Auto Take Off just to try to get a cleaner takeoff...she took off alright, almost pulled right out of my hands haha Although the first launch attempt was even worse. My buddy (who actually owns the plane) was going to throw it, but actually dropped his front hand and the heavy battery made it just nose dive straight in. She still has that nose damage, just glued back together. https://www.youtube.com/watch?v=ZxScvyKnyYs After the glue cooled we did a true hands off auto launch (iNav 2.1.0 then) and you can see that I almost had it stall to the ground from only a slight upward angled throw. It's just a lot of weight to get moving. https://www.youtube.com/watch?v=yokxGfIXCwk