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Old 17th Nov 2006, 10:54
  #73 (permalink)  
youngmic
 
Join Date: Dec 2005
Location: Perth
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Raising the dead engine

Flywatcher,

Just a thought on your comment on raising the dead engine 3 to 5 degrees.

I used to believe this to be true from what I had learned during my twin training and never questioned the accuracy of these often quoted bank angles.

That was until I started flying twins in earnest and I aquired John Ecklabars Book "Flying High Performance Singles and Twins. He devotes nearly a whole chapter to dispeling these numbers as a myth (yep another one).

In short the correct numbers according to maths and historic research outlined in his book are in fact between 1 to 3 degrees. The lower the thrust from the remaining engine the closer the correct number will be to 1 degree. Small difference but significant, as every degree greater than optimum will degrade performance by 30'/min. 4 degrees out and you would be giving away 120'/min. Also worth noting that in attaining zero sideslip the ball will not be centred in an asymetric condition.

Don't ask me how you are suppossed to judge these subtle angles.
Although the book does give some insight.

Thoroughly recommend this book for all budding professional twin drivers (and single).

Regards
M
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