Do you need a certain airspeed to sustain a load factor in a dive , without stalling?

Question

Lets say we are flying an Extra300. The stalling speed is about 60 knots. I Know that when load factor is increasing so is the stalling speed. So, if i am in a dive pulling 4 g's ( it will increase the stalling speed by double) the stalling speed will now be 120 knots. So, do i have to be above 120 knots in a 4g pull to not stall the aircraft?

Answer 1

In a dive, the wing would be "unloaded". Are you referring to the pull-up? Are you banking?

Answer 2

load has absolutely, positively nothing to do with airspeed. other than as you say, it's affect on stall speed. but that's also the case with load effect on maneuvering speed, best l/d speed, approach speeds, you name it. take off speeds in our 727 must be computed for every takeoff and weight is the primary factor. things that happen in airplanes happen at higher  airspeeds with increased weight and loads.

and john r, who said his dive speed is 60 kts. his question is valid. for instance, if he is in a 120 kt dive and pulls 4 g's, yes the airplane will enter an accelerated stall imediatly. he's saying 60 kts is the 1g stall speed at max gross weight, as published in the afm. there is no mention of the dive speed but it's safe to assume that he is asking that if the speed was 120 kts, could the airplane stall at that  speed with increased load factor. so indeed the stall speed, increasing as the square root of the load factor, 2, in this case, doubles from 60 kts to 120 kts..

Answer 3

You are on the right track, in that going fast doesn't mean you won't stall. If you increase the AoA high enough the wing will stall regardless of speed. You can see this demonstrated at your local R/C flying field, usually with bad results.

Answer 4

Yes - you have to be above 120 knots so  as not to stall the aircraft.

You have calculated the 'g' load factor - vs - stalling speed correctly, hence you have an excellent insight into this aspect of flying.

Answer 5

Stall depends exclusively on angle of attack.

Answer 6

There a problem with your question.  You are not going to be in a dive doing 60 knots, unless you are in a Cessna 150 with all 40 degrees of flap extended.

      At 60 knots, the plane will stall well before you get 4 G's, not matter what the attitude or direction of flight.

Answer 7

You are correct.

you will need to be above 120 knots in a 4g pull to not stall the aircraft.

Likewise, you can be going at Mach 2, but if you pull up quickly enough, you will stall. This is because stall is related to the wings, not your speed. If you manage to get your angle of attack high enough and quickly enough to a point that the wing does not develop lift anymore, you stall. It's pretty simple.