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The only thing that I know is the landing gear geometry. I also don't have access to Matlab or the other programs. The calculations are indeed not so complicated, but if you have very less information, they become difficult. I made an approximation of the landing gear extension/retraction times...

Thank you, I indeed askek LEE. They called me on the phone. I told them what my problem was, but even they could not calculate this. I think I have to give up with the calculations. It is really hard. And I am not going to use other restrictors or control valves in the hydraulic system. But...

For implementation, the hydraulic system already excists. It is the hydraulic system of a Dash 8 aircraft

Thank you for your answers IHA and aviat. According to the formulaes of the LEE company, I also get a differential pressure of 2000 PSI. I don't get this since the system pressure is 3000 PSI. Why would you use such a loss in energy in a system? The LEE jets used are of the type: JEHA1872550L...

That's what I thought...What a pity! Those aerodynamic models aren't available for me! So I think, I can't solve the problem with the means I have!

Thank you...It is really logicall indeed. But than you assume the flow rate is always the same. It is really hard for me to believe that, because I did see with my own eyes, the actuating times are different, if the input flow rate differs. What to do with it?

But if I'm not wrong, an orifice decreases the hydraulic flow? To control the speed of the actuator and to prevent cavitation in the system?

The pressure needed to open the actuator is about 1000 PSI.

This orifice is used in a already designed hydraulic system of the Dash 8 Aircraft. I'm trying to calculate the actuating times of the Main landing gear actuator. The normal flowrate in hydraulic lines is 2,91 gal/min. I want to calculate the flow rate after the flow is restricted if the flow...

Yes this is indeed a Lee plug with a Lohm rate of 550. According to the formulaes given at their site, the pressure drop is about 2000 PSI. If the Lohm rate increases to 1000 and the flow rate remeans the same, the differential pressure is about 8000 PSI. That is not possible since the system...

How do I have to calculate the pressure drop over a restrictor? If I calculate it with the formula stated below, the pressure drop will be huge!!! Q=Cf*A*SQRT((2*differential pressure)/Density) A=0.7 mm^2 Q=1.66 GPM Density=0.997 g/ml The units have to be calculated in cubic meters and...

How do I have to calculate the pressure drop over a restrictor? If I calculate it with the formula stated below, the pressure drop will be huge!!! Q=Cf*A*SQRT((2*differential pressure)/Density) A=0.7 mm^2 Q=1.66 GPM Density=0.997 g/ml The units have to be calculated in cubic meters and...

Thank you for your answer, it is really helpfull to me! Cheers

I am calculating the extension and retraction times of a Fokker 50 landing gear. I found some restrictors in the hydraulic scheme of the Fokker 50. I know the flow before and after the restrictor. Is it then possible to calculate a certain factor or relation between the hydraulic flow and the...