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11 votes
Accepted

PoH says airplane climbs steeper at higher weight. Why? How?

There are three stages to a short field takeoff over an obstacle- the ground roll, where the airplane accelerates to the minimum airspeed necessary to leave the ground, a period of further ...
Chris's user avatar
  • 16k
5 votes

PoH says airplane climbs steeper at higher weight. Why? How?

This is a very interesting question involving an amphibious aircraft, the Super Petrel LS. Building on the answer by Chris, we see that take-off from water would involve "muddy/soft" field ...
Robert DiGiovanni's user avatar
4 votes

Steepest climb a wingsuit pilot can achieve?

Wrong: A climb of 64 degrees was momentarily reached by Luke Rogers on Sept. 9, 2018 near Brisbane, Australia. This was 65 seconds into his flight track, where the climb rate was 153 km/h and the ...
Camille Goudeseune's user avatar
4 votes

What would the effect be of flap deployment on a UAV such as the Reaper or Predator?

the climb performance is usually worse with flaps extended That depends which parameter needs to be maximized. If you want to climb as steeply as possible, flaps will definitely help. If, however, ...
Peter Kämpf's user avatar
3 votes
Accepted

How can I control the flight path angle (or the ROC) with throttle in Simulink?

Instead of using two separate loops for controlling the elevator and thrust, I would recommend to use the TECS (Total Energy Control System) algorithm which simultaneously controls the elevator and ...
U_flow's user avatar
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1 vote

How can I control the flight path angle (or the ROC) with throttle in Simulink?

can I still get some physics advice? With aircraft it is far easier to control pitch to the horizon (therefor the aircraft flight path descending, level, or climbing) with throttle control. The ...
Robert DiGiovanni's user avatar
1 vote

How does changes in Power vary the aerodynamic forces on an aircraft?

Besides the changes in the thrust force and its follow on effects on lift etc., there are trim changes with power. The changes depend mainly on the location of the thrust line relative to the vertical ...
John K's user avatar
  • 132k
1 vote

How does changes in Power vary the aerodynamic forces on an aircraft?

The rate of climb is: $R/C=\frac{\left(T-D\right)V}{W}$ So, increasing thrust (while leaving angle of attack constant) will leave lift coefficient constant, drag constant, airspeed constant, etc. But ...
Rob McDonald's user avatar
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1 vote

Does lift equal weight in a climb?

In flight dynamics (not aerodynamics), Lift is in the opposite direction along the stability Z axis. This is also where Lift Coefficient (CL) is calculated from. It's not in the body axis, not in the ...
LJQCN101's user avatar
  • 355
1 vote
Accepted

Determine Vx and Vy from other climbing rate datas

Since you have only one data point and no other information about the airplane, it is impossible to calculate the climb rates exactly. It seems your data point is neither at best climb angle nor best ...
Peter Kämpf's user avatar
1 vote

Determine Vx and Vy from other climbing rate datas

While there may be only a few degrees difference in angle of climb between Vx and Vy, let's see what those few degrees mean. The easiest way to determine climb rate at Vx and Vy is to actually fly it. ...
Robert DiGiovanni's user avatar
1 vote

How is Vx speed and Vy affected when climbing?

Both Vx and Vy vary somewhat by density altitude. Check your POH. It should have a table. It doesn't vary much, though. Somewhere in the neighborhood of 7 kts per 10,000 feet.
Grid77's user avatar
  • 27
1 vote

How is Vx speed and Vy affected when climbing?

I assume you ask for a piston-powered airplane with constant speed propeller. Next, I assume you want those speeds as IAS, so you need not correct for density effects. Then the grah below shows the ...
Peter Kämpf's user avatar
1 vote

How is Vx speed and Vy affected when climbing?

Yes the speeds would change-- because they must converge at the aircraft's absolute ceiling, where no more climbing is possible. Vy (best climb rate speed) decreases more than Vx (best climb angle ...
quiet flyer's user avatar
  • 22.7k

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