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We know that for any level flight (not climbing) the amount of lift must be equal to the weight of the aircraft, thus if all up weight is lower then the amount of lift required is less too. To calculate the new stall speed: Vs new = Vs Old Weight × √(New Weight / Old Weight).Since we know that the density of air decreases with altitude and from the formula V = SQRT ( 2* L / (Cl * p * S ), we see that density is inversely proportional to stall speed we can say that stall speed does increase with an increase in altitude.In general, the desired stall speed should be 500-700 RPM below the engine RPM at peak torque. This ensures a margin for application for the torque converter to take off.
- Formula: Mach Number = Aircraft Speed/Speed of Sound (dependent on altitude)
- Example: Aircraft is flying at 30,000′ Speed of sound at 30,000′ = 589.4 knots. The airspeed is 489.3 knots.
- Calculate: 489.3/589.5 = 0.83 Mach.
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What is the formula of stalling?
Since we know that the density of air decreases with altitude and from the formula V = SQRT ( 2* L / (Cl * p * S ), we see that density is inversely proportional to stall speed we can say that stall speed does increase with an increase in altitude.
What is normal stall speed?
In general, the desired stall speed should be 500-700 RPM below the engine RPM at peak torque. This ensures a margin for application for the torque converter to take off.
Lift and stall speed calculation
Images related to the topicLift and stall speed calculation
How do airplanes calculate speed?
- Formula: Mach Number = Aircraft Speed/Speed of Sound (dependent on altitude)
- Example: Aircraft is flying at 30,000′ Speed of sound at 30,000′ = 589.4 knots. The airspeed is 489.3 knots.
- Calculate: 489.3/589.5 = 0.83 Mach.
What is 1g stall speed?
Stall speed at 1g load factor is defined as the one-G stall speed at which the airplane can develop a lift force (normal to the flight path) equal to its weight.
Does stall speed change with weight?
Factors such as total weight, load factor, power, and center of gravity location affect stall speed—sometimes significantly. Stall speed increases as weight increases, since wings need to fly at a higher angle of attack to generate enough lift for a given airspeed.
How is stall torque calculated?
Ohm’s Law states that current is equal to the supplied voltage divided by the resistance. This would be the starting/stall current. If the motor’s torque constant (Kt) is known you can take Kt* the current and determine the starting/stall torque.
How do you calculate the stall speed of an RC plane?
stall speed is proportional to SQRT(weight/area). Vs=SQRT(2*Weight/(rho*Area*Cl)) where rho is air density.
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How does stall speed change in a turn?
As the load factor increases, so does the stalling speed. For example, if an airplane stalls in level flight at 50 knots, it will stall at 60 knots in a level altitude, 45° banked turn and at 70 knots in a level altitude, 60° banked turn. Stalling speed increases at the square root of the load factor.
What happens if stall speed is too low?
Converter stall speed must be high enough to put the engine into the torque range where it can most efficiently launch the car. If converter stall speed is too low, the car will be lazy leaving the line; if too high, there’ll be excessive high-gear slippage—either case adds time to your e.t.
What does a 2500 stall converter do?
A 2,500 stall speed doesn’t mean you need to rev the motor to 2,500 rpm for the vehicle to move.” What it does mean in this case is 2,500 rpm is the limit at which the converter will hold back the engine speed if transmission output is prohibited.
What does a 3500 stall converter do?
If the converter was a 3,500 RPM stall, then it would be at approximately 3,500 RPM in which it forces the tires to break loose.
What affects stall speed?
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Is ground speed faster than airspeed?
The relationship between airspeed and ground speed is fairly simple. Ground speed is simply the sum of airspeed and wind speed. What is this? If the aircraft is flying in the same direction as the wind is blowing, the aircraft experiences tailwind, and its ground speed is higher than its airspeed.
Do planes use knots?
Also known as a nautical mile, knots are measurements that planes and ships use to measure speed. One Knot per hour equals 1.15 miles per hour. The reason for using a different method of measurement is because both boats and planes measure distance using latitude and longitude.
What is aircraft kts speed?
A knot (often abbreviated to kts) is a unit of measurement of speed, with 1 knot equal to 1 nautical mile per hour. Knots is the speed that the pilot uses as he flies – the air speed indicator inside a flight deck measures knots – just as a car driver would give the driver a speed in miles or kilometres per hour.
How many Gs is a stall?
For example, in a 60-degree bank, the airplane and its contents experience 2 Gs (that’s a G-force of 2). Figure 2-2 shows that 2 Gs give you a 40 percent increase in stall speed. Therefore, an airplane stalling at 50 knots in level flight will stall at 70 knots in a 60-degree bank (40 percent of 50 added to 50).
Why do planes stall when flying straight up?
As the angle of attack increases, wing lift goes up and up and up, then suddenly drops sharply as the smooth air flow detaches from the back of the wing. That’s the stall.
Can an airplane stall at any speed?
Stalls occur not only at slow airspeed, but at any speed when the wings exceed their critical angle of attack. Attempting to increase the angle of attack at 1g by moving the control column back normally causes the aircraft to climb.
Why does power lower stall speed?
So when thrust is inclined upwards, it decreases the requirement for lift and reduces the stalling speed. In addition, the slipstream generated by having power on increases the speed of the airflow and modifies the angle of attack (generally decreasing it) over the inboard sections of the wing.
Why do flaps lower stall speed?
Reduced Stall Speed With Flaps
Extending flaps reduces your aircraft’s stall speed for a fairly simple reason. Because your wing creates more lift with the flaps down, you don’t need as much angle-of-attack to balance the four forces of flight.
What is the stall speed of a Cessna 172?
The design stall speed for a Cessna 172 at maximum weight with flaps fully extended is 40 knots indicated air speed.
How do you calculate motor load speed?
…
At 60 Hz, a motor with two poles operates at 3,600 RPM with no load and about 3,450 RPM with a load:
- (Hz x 60 x 2) / number of poles = no-load RPM.
- (60 x 60 x 2) / 4.
- 7,200 / 2 = 3,600 RPM.
Stall Speed explained in Curt’s Corner
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What is the formula for motor speed?
AC Motor RPM Calculation Examples
For an AC motor, the number of poles and the frequency determine the no-load RPM. For a 60 Hz system with four poles, the calculations to discover RPM would be: (Hz x 60 x 2) / number of poles = no-load RPM. (60 x 60 x 2) / 4.
What does stall torque mean?
Stall torque is the torque produced by a mechanical device whose output rotational speed is zero. It may also mean the torque load that causes the output rotational speed of a device to become zero, i.e., to cause stalling.
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