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Thursday, July 15, 2010
An Argument
Friends
Its just a simple question...
U all must be aware of LIFT = CL * 1/2 * density(p) * V(squared) * S
Is this what LIFT about?? Is that given formula TRUE???
Yes because this is a mathematical equation for Lift which is true most of the times, No because there are some things which are not taken into account.
I would like to explain why this equation Lift = ½ * ρ * V2 * Surface area of Wing Is not totally correct.
A contributor of Lift, DOWNWASH behind the wing is totally ignored in the given equation. If we have a look at the vector of downwash, it is inclined backward and downward, for example imagine a vector at 160° inclination with magnitude (M).
According to Newton’s Third law of motion, which we all know very well that “Every action has equal and opposite reaction” applies to the downwash vector as well. So that a new vector 340° and magnitude (M) will be acting on the aircraft. Now here notice this new vector has a direction forward as well as upward and same magnitude. This vector when split in to two vectors, the upward acting vector will be definitely add into the total LIFT.
This reaction of down force is not considered in the above mentioned equation of LIFT. So we can conclude that the formula, Lift = ½ * ρ * V2 * Surface area of Wing Is not entirely true.
Any further suggestions or corrections are welcome.
hey ....very well explained...!!! i am very much keen and interested on to extend ma knowledge in term of subject related to cpl and atpl...right now in this year there is no scope of employment..so if at all there is any chance of me coming to Ur classes and strengthening the base of aviation knowledge please let me know..it would also help me for clearing interviews..please keep me updated regarding the same.
The answer to this question will be YES and NO.
ReplyDeleteYes because this is a mathematical equation for Lift which is true most of the times, No because there are some things which are not taken into account.
I would like to explain why this equation
Lift = ½ * ρ * V2 * Surface area of Wing
Is not totally correct.
A contributor of Lift, DOWNWASH behind the wing is totally ignored in the given equation.
If we have a look at the vector of downwash, it is inclined backward and downward, for example imagine a vector at 160° inclination with magnitude (M).
According to Newton’s Third law of motion, which we all know very well that “Every action has equal and opposite reaction” applies to the downwash vector as well. So that a new vector 340° and magnitude (M) will be acting on the aircraft. Now here notice this new vector has a direction forward as well as upward and same magnitude. This vector when split in to two vectors, the upward acting vector will be definitely add into the total LIFT.
This reaction of down force is not considered in the above mentioned equation of LIFT. So we can conclude that the formula,
Lift = ½ * ρ * V2 * Surface area of Wing
Is not entirely true.
Any further suggestions or corrections are welcome.
so is it : Lift = ½ * ρ * V2 * Surface area of Wing + Lift Generated by Forward/Upward Vector???...anewez wat an observation guys...hats off !
ReplyDeletehey ....very well explained...!!! i am very much keen and interested on to extend ma knowledge in term of subject related to cpl and atpl...right now in this year there is no scope of employment..so if at all there is any chance of me coming to Ur classes and strengthening the base of aviation knowledge please let me know..it would also help me for clearing interviews..please keep me updated regarding the same.
ReplyDeleteRohan K Pansare