I understood that those markings on the front of the turbine shaft were to make it more visually obvious to ground crews that the engine was in operation.
In flight, it's unlikely that the addition of that relatively tiny decoration would make...
I learnt to avoid trees the hard way, in my early years of rc model flying. Now, I can usually take off and land on even a very narrow strip or path without aid of a gyro or any such device, rudder is your friend. It used to be a lot harder for...