Well,I'm back to the landing gear/emergency gear extension system.I took the MK1 for a spin yesterday (I never flown mk1 before,only 2a) and put her on jacks to do some tests.Here is what I've found:
Emergency gear extension doesn't work.It extends the gear some 55-60% and that is it,you can't extend it 100% using the emergency system.
I tried,just out of curiosity to unlock the gear and mechanically (inspired by rock it to lock it) lower it.I found out the following:If you just keep cycling the gear selector lever (not the hand pump) the gear will lower to about 90-95%.Then I managed to lock it down by rocking the aircraft (to be honest,a spin did it in the end).While doing so I noticed that the landing gear struts oscilate as I rock the aircraft,probably the hydraulic struts used for gear extension act as shock absorbers.
I also tried extending it to 95% (using the gear selector lever alone) and then touching the ground and yawing to the side (in an atempt to physically move the gear strut to lock it,but it just stayed there,i managed to land with gear unlocked,stop, put her on jacks and the gear was fine,I didn't damage it.
Also,the same old problem,when you discharge emergency gear extension cylinder with the gear selector in raise position,the gear will lower with no problems using the main system.
My questions are:
1) what should a mk1 pilot do if,for example,hand pump lever broke and he was unable to lower the gear,but system remained pressurized (no loss of main hydraulic system,just the hand pump lever).He couldn't fully lower the gear using emergency system.
2) again,when discharging emergency cylinder with the selector in up position,you should at least have difficulties lowering the gear using main system,or not being able to lower it at all,or breaking the up locks in the process.
3) if the gear was unlocked,only held in 90% down position by hydraulic struts (again,mk1,no pressure at the moment),shouldn't the contact with the ground and yawing of the aircraft move the strut to the side?
4) shouldn't I damage the gear if I land with gear unlocked?
Владимир Левков/Vladimir Levkov
Aviation is proof that,given the will,we have the capacity to achieve the impossible