I have a question that was raised by reading last week's Flight International Dash-8-Q400 flight test. I'll quote;
While taxiing, an area was found to run up the engines and check the propellers, including the airspeed govenors, and arm the auto-feather system. The aircraft must stay within 30 degrees of any significant surface wind and a clear area is needed behind in the region of the propeller slipstream.
Once the first-flight-of-the-day run-up has been done, subsequent takeoffs demand a shorter checks and experienced crews should accomplish this quickly and smoothly. This chore is inescapable with a turboprop and puts it at a disadvantage to turbojets sic, which generally don't require a run-up.
OK, I basically want to know what the run-up is for, what exactly it accomplishes, and why it isn't required on jets. I understand what the auto-feather is, but that's about it!
Also, all DHC-8-Q400 takeoffs, have to be brakes-off, rolling start. Is this something unique to this aircraft or truboprops in general? Why is this so?
Sorry to ask so many questions, but I really don't understand props in any great depth