ORIGINAL: Guillermo Ibanez
Hi Nuno:
I have installed in my Skymaster F-16 1/8 the Air Micro Switch from BVM (part No.: BVM # 5753 at USD $ 27.50).
You can find it at:
http://www.bvmjets.com/Pages/Catalog/air.htm
I have also installed the Tamjets Gear Fail Safe and it have been working very nice. I have set the activating pressure in 50 pounds. After the gear is retracted, the strut push the button in the swicth through the lever and air flow to the doors cylinders closing them.
When gear is extended, the strut release the button of the Air Micro Switch and gears and doors open simultaneoulsy.
Regards
Guillermo
the trigger valve is an OK cheap way to work doors
But I've found it only works reliable when you've got a forward retracting gear that you use for the trigger strut. the air pressure in flight on that gear slows it down from retracting so all the gear have an opportunity to get up and tucked away before the switch is pressed, otherwise it's luck of the draw and if the trigger gear happens to not be the last gear up then the doors close on the other gear.