Anyone have any hard numbers they'd like to share?
What's your impossible turn floor in your aircraft?
Here's what I learned, the hard way, at a remote field, many years ago. Whatever your 'planned' or 'tested' or 'trained' number is -- double it in a real life situation.
Currently my hard, tested number for my plane, under solo conditions @ 3500' on a hot day(will not test with others in the plane) is 800'. Which means that unless I have ~ 1600' I'm crashing straight ahead.
When it all goes wrong for real, it's amazing how badly one will perform. This is what is so surprising from the recent DFW crash. A well trained, experienced, and solid pilot with acro experience seems to have failed at the impossible turn. It can happen to me, and I'd much rather plow into a street full of cars at a 6 deg angle, going 50MPH than 50 deg angle going 6 MPH(forward).
YMMV, don't try this at home, closed course, pro driver, objects in mirror, and may cause anal leakage.
Pull to idle, best glide speed. First try at pattern altitude and when you've completed the turn, the difference between pattern altitude, and altitude remaining is what you've got. The best scenario is in calm wind. Remember that when you take-off on a wind favored runway and make you're turn, you'll lose headwind and descend faster. NEVER kill the engine (that's just stupid).
I have practiced this at a closed air force base near our home field. Slow flight over the runway and simulate takeoff. In the c150 I can make it back to the airport environment from 500ft agl. I practice at 2000 ft agl for a better safety margin.
I'll keep that in mind to double it.
I know you're right that in a real situation confusion and hesitation will undoubtedly take it's toll. Precious seconds wasted that a simulation just can't replicate because you're prepared.
Next time I go up I will play with bank angles and the angle of attack meter and see what I can do then double it for pre-flight checklist.
Depends on the airplane. I'd try it in a taylorcraft or a champ from one thousand feet but no less. Simply go to 2500 3000 feet and try it. Simple. Or.....try what the instructor with 3000 hours tried in NYS in 2006. She pulled the throttle on the student five hundred feet after takeoff. Stalled . Killed herself, injured the left seat student badly. He survived. Taylorcraft was found to have worn plugs and possible old car gas. I was there, it went down very quickly as she tried to bank into an empty field, not even try to return. In seconds she was dead. No shoulder harnesses, she became the airbag as it hit hard on her side.
Student reported she said " I've got it" tried to add throttle but it quit.
Before I try this for real I want some input.
What I want to do is figure out my "impossible turn" altitude.
If I start at a safe altitude and put the plane in take off attitude then pull the mixture ... what I want to do is stop the prop and simulate an engine seize for real. Then turn 180 degrees and record the altitude loss, distance, and time. Will the prop stop? How do I set this up? Should I have a safety pilot and parachute's? Has anyone done this?
I think the next step is to be OVER the numbers at the DER, not abeam.
It's significantly harder.
Unless it's a short runway, you won't be able to glide to the far end and then land, from 600 feet.
That is, unless there is a parallel runway or taxiway, or at least a level field, to land in from abeam the numbers.