Do I need a new collar?

[srislash]

Then it is loading the motor. Did I catch that it is a Spartan?
Which motor?

You could try raising the strut. How big was the old prop? A1615 is only 40mm in diameter.

[pintobean11]

Then it is loading the motor. Did I catch that it is a Spartan?
Which motor?

You could try raising the strut. How big was the old prop? A1615 is only 40mm in diameter.

Yes, it's the spartan. All electronics are stock and the prop is 42mm in diameter.

[srislash]

I would try raising the prop up if possible.
Any chance of a video? It would be of great help