The aerodynamics of the Cessna 414A

[shizhe 0]

The aerodynamics of the aircraft need to be improved and the aircraft seems to have difficulty entering a stall. The red line on the IAS is 75 knots. After a simple test, the stall speed is about 65 knots with the flaps retracted, and the stall speed with full flaps is about 55 knots. Shut down an engine to simulate a single engine failure state, the speed is lower than the IAS blue line and still cannot enter a single engine stall state, even below the red line is still flying. Hope this can be improved

Edited March 26, 2022 by shizhe

[RichieFly 728]

What was your load? Less than max gross weight and you find the stall speed will be lower than the instrument marking stall speed.

Hopping in and flying you'll be way below MGW unless you change the load in the weight and balance page.

I thought the flight model was quite good.

[C525B 86]

3 hours ago, shizhe said:

The aerodynamics of the aircraft need to be improved and the aircraft seems to have difficulty entering a stall. The red line on the IAS is 75 knots. After a simple test, the stall speed is about 65 knots with the flaps retracted, and the stall speed with full flaps is about 55 knots. Shut down an engine to simulate a single engine failure state, the speed is lower than the IAS blue line and still cannot enter a single engine stall state, even below the red line is still flying. Hope this can be improved

There might be some confusion here because red line shown on this airplane's airspeed indicator is not stall speed, it is Vmc.   Vmc is the lowest speed at which directional control can be maintained with a failed engine (without considering specific factors)...it has more to do with running out of rudder and does not mean the wing is stalled.  The blue line is Vyse, best rate of climb on a single engine.  Actual stall speed is neither of these marks, and in general, would depend highly on actual conditions.  I have not tried to fully stall the 414 yet but your flight test data doesn't seem too far off the mark.