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How would you determine the Lift(thrust) force of a Helicopter in hover 
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#1
Feb2307, 01:42 PM

P: 9

I know the lift force equation is .5*rho*V^2*Area*Coefficient. But I was wondering in the real world how would you measure the lift force? I hope they don't just plug the values for the equations.



#2
Feb2307, 02:32 PM

PF Gold
P: 8,964

The easiest way is to weigh the helicopter. If it's hovering, the lift force equals the weight.



#3
Feb2307, 02:49 PM

P: 9

I was wondering like if you are building your own helicopter what would someone use to test the amount of thrust produced by the rotor?



#4
Feb2307, 02:54 PM

P: 183

How would you determine the Lift(thrust) force of a Helicopter in hover
i wonder if bernouilli's equation can be put to use in this case. i know that it can be used when there is wind driving a wind turbine. it should work here



#5
Feb2307, 03:00 PM

P: 9

I guess you can use Bernoulli to calculate the change in pressure helicopter.



#6
Feb2307, 03:08 PM

P: 183

i think u can find the maximum power yield by zeroing the velocity at the exit



#7
Feb2307, 03:17 PM

P: 21

yeah we can find the maximum power yield by zeroing the velocity at the exit
if smbody interested , i caN upload a book on the aerodynamic of the helicopter. tel me if interested regards 


#8
Feb2307, 03:22 PM

P: 9

That would be great.
Thanks 


#9
Feb2307, 03:28 PM

P: 21

I will try tmrow , i willl send u a link on rapidshare or mhid.net;
ur welcome and hope that will be helpful 


#10
Feb2307, 03:33 PM

P: 183

definitely interested in that:)



#11
Feb2307, 03:47 PM

Sci Advisor
P: 5,095

In regards to the original question, the airfoils and rotors are well known throughout the flight envelope from wind tunnel testing. The calculations involve effects of trailing blades, etc... Of course, the calculations are always compared to actual testing. 


#12
Feb2307, 05:42 PM

Mentor
P: 22,302




#13
Feb2407, 12:36 AM

P: 53

scale down models and wind tunnels are to measure the force.



#14
Feb2407, 01:01 AM

P: 21

this si the link uploaded in the rapidshare
Hope that it is helpful 


#15
Feb2407, 01:03 AM

P: 21

another book



#16
Feb2407, 01:04 AM

P: 21



#17
Feb2407, 01:07 AM

P: 21



#18
Feb2407, 08:15 AM

P: 9

Thanks a lot



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