Milt,
What jolly good fun this all is ...
Cap 56 - "If the force from the rudder/fin (they work together) is equal to the the force from sideslip caused by the bank, while at the same time you balance the moment from the live engine, you have zero slip straight flight."
Milt - " .. you have cancelled out the sideforce due to the bank caused sideslip. Now we have no sideforce to counter the yaw being rapidly developed by the live engine. We are turning into a frisby again. "
Cap 56 addressed the need to keep the moment balance - hence no frisbee excitement. A more appropriate observation would have been that the requirement to maintain zero slip (once obtained) is to maintain a nil residual lateral force and nil moment imbalance.
One should observe that a zero slip condition is likely to be approximate and than there will, in all likelihood, be random minor excursions into a slip regime .. but the general point still remains... or are you simply being pendantic on this point of semantics ?
"Absolutely impossible to have zero side slip with bank applied. The very reason we put on bank in the first place was to generate that indispensable sideforce to counter the yaw and allow us to get the rudder close to centre."
Generally accepted for symmetric thrust .. but the crux of the discussion for a thrust asymmetry. Again, why is there a need to seek the Holy Grail of near zero rudder deflection ?
"Having turned to the new heading you must return to balance again by returning the rudder to its precise original anti yaw position. Remember if you change CAS or thrust or drag you unbalance and there will be a changed rudder deflection to regain balance."
Can not the pilot play with bank-related forces in addition to, or in lieu of, rudder-generated forces ?
Fred,
First shout is on me during your forthcoming trip ...
SR71,
Why don't you come along also and at least we will outnumber Milt.
Milt,
You stir the pot superbly well, good sir.