For lack of a better word.. just gona say inexperience.
At the top of the loop I went palm up and and started to slowly give it some "up" to come out the loop gradually but as it went it... I had my arm up in the air still as it was going into the loop. I'm think it may had held neutral.
The plane altho it looks like it went straight in... actually went in at a 45....a little more effort and it would have survive then who knows after that lol
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Many would say that you should not switch hand positions going into inverted.
I would say that you could if you want to, but palm down rather than palm up.
It is a much more relaxed position than palm up. Hold you arm out and see how much force you have to apply in the two positions.
The usual argument for palm up is that if you simply stop following the model with your hand then it will climb.
But this also means that it is more difficult to whip the model. I can whip better inverted than upright.
When learning inverted start of with a lazy eight. A bit more than half a loop then give down to exit.
Slowly extend the inverted portion, always knowing that you will give down to exit at the first sign of trouble.
Knowing exactly how you are going to bail out will make it easy to remember.
Don't try to get low inverted at first, stay high to give yourself more time.
In R/C they say to stay 1 and 1/2 mistakes high when learning. Not possible with C/L, but at least you can stay 1/4 a mistake high

Pat MacKenzie