How would you determine the Lift(thrust) force of a Helicopter in hover

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

 

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

 

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

 

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

 

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

 

definitely interested in that:)

 

You could do this simply with a spring scale and something to constrain the rotor group to the scale and something to drive it. It is even easier if you have a strain gauge based force transducer because then there would be no axial movement due to the thrust.

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.

 

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

 

this si the link uploaded in the rapidshare

Hope that it is helpful

 

another book

 

http://rapidshare.de/files/22495932...mics_Workbook_CNATRA_P-401__US_Navy_2000_.pdf

 

http://rapidshare.de/files/22495355...opter_Aerodynamics__BSP_Prof._Books_1990_.pdf

 

heyy there can u pls re-upload the file for me pls? i couldnt download the file. actually im new here. so pls help to guide me :) thanks in advance eh

 

Look at the dates on the posts. This thread has been dead for more than 4 years. It's not surprising the links don't work any more.