PPRuNe Forums - View Single Post - Courting disaster by "demonstrating" Vmca
Old 4th June 2006 | 02:35
  #50 (permalink)  
Naughty S
 
Joined: Feb 2004
Posts: 48
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From: Paradise
A very good topic for discussion.
I have always found it best to explain things to
students in practical Laymans terms (ie common sense).

What is the AIM of Vmca demo exercise.
If you have an engine fail after TKOF then maintain Blueline, if you dont maintain
Blue line and speed decreases this is what can happen. The exercise will not be practised
after TKOF but at a safe altitude. At altitude less thrust = possible stall before loss of
directional control therefore Red line + 5/10 = minmimum speed before initiating recovery.

For the exercise I will simulate a failed engine by selecting one throttle to idle (slowly)
and the other throttle will be set at full power. Raise the nose slowly and approaching
redline +5/10 recover, if you dont initiate recovery I will call out RECOVER.
The C310 is generally Ok @ 5000'(Redline +5), However the BE55/58 BE CAREFUL (Redline +10)
came close to a spin when student said I have no more rudder and rolled the aileron for which I
closed throttle and intitated recovery and a pants change.

Relate to what is already known;
When conducting initial stall training and power off recovery,lower the nose increase airspeed
and increase power slowly and recover,this exercise is basically similar with the addition of
the asymmetric and associated yaw/roll etc which we no doubt discuss.

There is absolutely no reason to make a simulated scenario the real thing and becoming a test pilot.

Most people will initiate recovery as soon as the speed is identified even coming close to
redline therefore why explore what happens by continuing to decrease the speed even further.
Even during intitial stall training - stall warning and all will initiate recovery, even
the slow learners I have trained will do something.

Last week in C310 initial twin student says to me the the nose is not showing loss of control,
my comment was "would you ever fly at this speed" and "do you really want to find out what happens"
the answer obviusly was "No". I had already told him the above Baron aileron story on gnd.

Best advice I can give "KEEP YOUR FEET ON THE RUDDER PEDALS AND BE PREPARED TO TAKEOVER",
"DONT WAIT FOR ANOTHER 5KNOTS FOR RECOVERY, JUST TAKEOVER AND DO IT".

So without trying to Burn my comments I am NOT telling you all how to suck eggs. This is
simply what I do and I'm still breathing. Training is as safe as you make it.

Cheers
Naughty
Naughty S is offline