The Rotorway continues to surprise

A day of tests at Street Farm and a very interesting day. One helicopter I flew had a few eccentricities, which is perhaps the norm in home-built machines.
Firstly, on start-up it backfires as though someone had put a bomb in its exhaust. Slightly alarming.

Secondly, when the student pressed the PTT to talk to ATC the RPM dropped to zero! This is only an electrical fault, but certainly gets the heart pumping first time you see it.

Thirdly, and this is definitely its most exciting fault: when closing the throttle in autorotation the engine really stops. And, because all is quiet anyway (no engine) the only way of telling that the engine has stopped is by watching the oil pressure, which had dropped to zero.

We did an in-flight restart, and with a couple of grudging goes it did finally start; but these things do get ones concentration.

Rest of the flight and the other test was completely normal and without problems. Lovely day for flying too, light winds and warm and sunny.

A school of Rotorways