Hydraulic restrictor
Hydraulic restrictor
(OP)
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 restriction? Or are there some formulas to calculate this? I hope that I can calculate the hydraulic flow after the restrictor if the flow before the restrictor varies! Who can help me solving this problem? According to me; the bigger the flow the more the restrictor pinches the flow.
Before restrictor After restrictor
7.9 gal/min 2.43 gal/min
1.5 gal/min ??????????
Before restrictor After restrictor
7.9 gal/min 2.43 gal/min
1.5 gal/min ??????????
RE: Hydraulic restrictor
Often in gears there are resistors to prevent the gear from coming down too fast. In order to accurately measure flow, I think you would have to remove it and put it on a flow bench, where you can control the variables. Fokker or the gear manufacture (Dowty I believe) may have the flow rate in their component overhaul manuals. Otherwise, swapping out with a known good valve for troubleshooting may be easier.
BTW There are several other causes, both hydraulic and mechanical, that can cause retraction times to be wrong.
Cheers
RE: Hydraulic restrictor
Cheers