GasGuzzler
Hunter
The obvious assumption was the sound is made by planes landing at THAT airport.
Question for aviation buffs
- Thread starter Dan in MI
- Start date
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rwp315
Single-Sixer
On take off there is a set/predetermined thrust setting.
During the approach/ landing phase there are specific flap settings required pending the reduction in airspeed. Each time the slates/flaps are changed it requires an increase in thrust setting to counteract the increased drag to hold a specific speed.
Air brakes/speed brakes can be used in flight if ATC requests a specific speed or altitude change that wasn't planned, for example traffic separation.
These devices then become ground spoilers upon landing when there is weight on wheels (wow) (landing gear squat switches compressed.
During the approach/ landing phase there are specific flap settings required pending the reduction in airspeed. Each time the slates/flaps are changed it requires an increase in thrust setting to counteract the increased drag to hold a specific speed.
Air brakes/speed brakes can be used in flight if ATC requests a specific speed or altitude change that wasn't planned, for example traffic separation.
These devices then become ground spoilers upon landing when there is weight on wheels (wow) (landing gear squat switches compressed.
True but they won't be heard 50 miles away from the airport. About the only thing that would happen at that distance is power setting changes.
rwp315
Single-Sixer
So true. I forgot about the 50 mile distance.
redhawker
Buckeye
Just a guess, but maybe it's about where they've reached their assigned altitude, so they quit climbing at that point, thereby maybe needing less thrust from the engines. The initial rate of climb at takeoff for a 737 is about 3,000 ft a minute, so to get to 30,000 ft would take something like 10 minutes or so. Takeoff speed is about 165 knots, and, of course, they are gaining speed from takeoff until they get to their assigned cruising altitude. You're probably near where they back off the power somewhat. Cruising speed is about 585 mph, give or take some, so you can see going from 165 at takeoff and climbing and accelerating to 585 would probably get them about as far as where you are in 10 minutes, give or take a little.
For reference. DTW and FNT (Detroit Metro, Flint Bishop) are the only airports big enough for the volume and size aircraft in this discussion. The red circle is my hunting area and the red line is the line of flight. So I'm pretty sure they are going to DTW and the altitude is not that high. From what I am reading it sounds like my WAG is close, flaps and or power down.
If you deploy the reverse thrusters in flight you crash.
Flaps/slats at about 200 kts and landing gear around five miles from the runway is about normal. Neither of those would be happening at 50 out. Power setting is about the only thing at that distance.
rwp315
Single-Sixer
NASA modified a Gulfstream 2 to be able to deploy the two thrust reversers in flight to duplicate the approach angle of the Space Shuttle I training.
I was able to do it many times in the simulator. Unbelievable experience.
rwp315
Single-Sixer
Watching the altimeter unwind is scary enough in itself. WOW!
RonEgg
Buckeye
You could deploy thrust reversers on the DC-8 to help your rate of descent. Only the outboards and at altitude. It was an approved maneuver, but frowned on and rarely used as it induced fuel leaks.
You can hear a plane landing from 50 miles away. I bet your are something while deer hunting. You can hear them coming from the next county.
