With the recwnt change to take off throttle delay it works when we test it on the ground shaking the aircraft to overcome the 5 meter acceleration then the 4 sec delay works. When we put it on a bungee the throttle started a few moments after the launch causeing the prop to hit the line. Unfortunately i dont have the flash logs but i have the tlogs.
We have found an issue with the bungy launch and the propeller can start too soon. A fix is in the works and being tested. It will be released as a bug fix shortly.