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Mxsmanic wrote in
: writes: There is nothing after leaving the rotor disk to change the direction of air flow. The airplane, helicopter, gyrocopter, and gyroplane all fly straight and level for the same reason and it isn't air being deflected downward. No heavier-than-air aircraft flies without deflecting air downward, Yes, they can, and do. Dynamic lift is usually at play but is by no means required. Bertie |
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Bertie the Bunyip writes:
Yes, they can, and do. Which ones? How do you accelerate an aircraft without accelerating anything downward? |
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Mxsmanic wrote in
: Bertie the Bunyip writes: Yes, they can, and do. Which ones? How do you accelerate an aircraft without accelerating anything downward? Send me 1,000 bucks and I'll tell you. Otherwise go find out yourself fruitcake. Bertie |
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Mxsmanic wrote:
Bertie the Bunyip writes: Yes, they can, and do. Which ones? How do you accelerate an aircraft without accelerating anything downward? Acceleration is the second derivative of position. If the vertical postion of an aircraft is constant, i.e. straight and level flight, the first derivative of the vertical position is zero and hence the second derivative is also zero. Acceleration is the first derivative of velocity. If the horizontal velocity of an aircraft is constant, i.e. straight and level flight, the deriviative of the velocity is zero. An aircraft in straight and level flight is not accelerated. -- Jim Pennino Remove .spam.sux to reply. |
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Jim Logajan wrote:
wrote: Mxsmanic wrote: How do you accelerate an aircraft without accelerating anything downward? [ ... ] An aircraft in straight and level flight is not accelerated. Cute - classic Usenet response. Simultaneously correct, but not really addressing the original issue. The point is that talking about aircraft acceleration in straight and level flight when discussing lift is irrelevant as the aircraft is not accelerating. -- Jim Pennino Remove .spam.sux to reply. |
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Mxsmanic wrote in
: writes: If the vertical postion of an aircraft is constant, i.e. straight and level flight, the first derivative of the vertical position is zero and hence the second derivative is also zero. Gravity is constantly trying to accelerate an aircraft downwards; something else has to compensate for this, or it will descend. An aircraft in straight and level flight is not accelerated. Because a force is being applied to it that exactly counters gravity. Whence comes this force? From somewhere that's waaaaay beyond you , obviously. Bertie |
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Mxsmanic wrote:
writes: If the vertical postion of an aircraft is constant, i.e. straight and level flight, the first derivative of the vertical position is zero and hence the second derivative is also zero. Gravity is constantly trying to accelerate an aircraft downwards; something else has to compensate for this, or it will descend. Your original statement: "How do you accelerate an aircraft without accelerating anything downward?" Go get a high school physics text and look up the difference between force and acceleration. An aircraft in straight and level flight is not accelerated. Because a force is being applied to it that exactly counters gravity. Whence comes this force? Lift, obviously. -- Jim Pennino Remove .spam.sux to reply. |
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