Originally Posted by
atrflyguy
Is there a formula for determining what the speed will actually be? Specifically for the 737 if that makes a difference.
If the formula is one that would require a calculator is there a quick way of getting a ruff number? i.e: 250 kts IAS = 2500 Lbs FF per eng, or mach .74 = Alt x 2 + 20 made into the EPR. That kind of thing…
What, if any are some of the factors that affect it? ( other than how far the rudder displaced ) although the statement says full rudder input and I am sure ( but could be wrong ) things like weight and air density would make a difference also.
Crossover Speed is the speed that requires FULL lateral roll control from ailerons & spoilers to counter roll due to Yaw caused by FULL rudder input. At speeds less than crossover speed with FULL rudder input the roll induced by the rudder starts to exceed the lateral control authority of the ailerons and spoilers.
Cheers all and have a great day.
Don't forget the first thing is to unload the airplane. The natural tendency is to pull back which increases G loading and G loading dramatically increases the crossover speed.
Unload.. increase speed and roll wing level. And if you're below about 1000AGL, be prepared for a VERY exciting ride.