PPRuNe Forums - View Single Post - Big plane vs small plane in turbulence
View Single Post
Old 31st Oct 2017, 11:03
  #39 (permalink)  
scifi
 
Join Date: Jul 2016
Location: Broughton, UK
Posts: 182
Likes: 0
Received 5 Likes on 3 Posts
Hi Guys, I think we need to consider the two different types of turbulence...

The first type is lift related, and is the type that makes you bump your head on the cabin ceiling. That can be explained by how much more Cl you have left before the wings stall, or the speed of the downdraught.

The other type of turbulence is caused by the rotor effect of say, flying into your own wake turbulence when doing tight turns with the wings already near their stall speed. This can soon turn you upside down and spit you out of your radiused turn. These rotors can also occur behind very large airfield buildings, and behind mountain ranges. I am just thinking that an airplane with full tip-tanks would be less susceptible to this type of turbulence than the same aircraft with the fuel in its inboard tanks. It all depends upon the distribution of Mass, and it's distance from the centre of gravity.
.

Hi Crash One, If you use the same units in the lift equations you will get the correct answer (use all metric, or all imperial.)
There is a simpler way of finding out the lift. As an example... K8 Glider Lift=350Kgs, Cessna 172 Lift=1050Kgs, Airbus =60,000Kgs.... It is simply equal to the aircraft's weight, in level flight. You can also work out the drag force easily... K8 glider has a 35:1 L/D. Therefore Drag = 10Kgs.

As for your car not flying at 60mph. It would if it drove off a cliff. hi hi.
.
scifi is offline