say_speed
New Member
I do not agree completely when you say that the flaps increase VMC when down.
it all depends on the airplane itself, you can go and see that by yourself (take an experienced MEI with you) and simulate VMC (block rudder mouvement) with different flaps settings, 10 degrees may reduce VMC, where 30 or 40 may increase it.
The FAA has not required the manufacturers to demonstrate VMC in the worst possible conditions, but rather to demonstrate VMC in the conditions, and configuration that you will have on take-off. Some are good (decrease) for VMC, some are bad (increase) for VMC. The reason being that a while back, the manufacturers were using all the tricks possible to demonstrate a low VMC; That is why the FAA put an end to that, and set some conditions in which it has to be demonstrated by all the manufaturers... As you can see, for the flaps, it specifies the flap setting used on take-off; which is the worst possible time to be faced with VMC...
For the flaps. as well as the cowl flaps, there is no real answer, it depends on the airplane you fly. For a Dutchess, 10 degrees of flaps decrease slightly VMC, anything beyond that increases it.
I never had a DPE telling me or my students, that this is wrong.
it all depends on the airplane itself, you can go and see that by yourself (take an experienced MEI with you) and simulate VMC (block rudder mouvement) with different flaps settings, 10 degrees may reduce VMC, where 30 or 40 may increase it.
The FAA has not required the manufacturers to demonstrate VMC in the worst possible conditions, but rather to demonstrate VMC in the conditions, and configuration that you will have on take-off. Some are good (decrease) for VMC, some are bad (increase) for VMC. The reason being that a while back, the manufacturers were using all the tricks possible to demonstrate a low VMC; That is why the FAA put an end to that, and set some conditions in which it has to be demonstrated by all the manufaturers... As you can see, for the flaps, it specifies the flap setting used on take-off; which is the worst possible time to be faced with VMC...
For the flaps. as well as the cowl flaps, there is no real answer, it depends on the airplane you fly. For a Dutchess, 10 degrees of flaps decrease slightly VMC, anything beyond that increases it.
I never had a DPE telling me or my students, that this is wrong.