Corsair hydraulic system
09-02-2021, 10:08 AM
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Corsair hydraulic system
I have a COMPARF F4U Corsair and have designed my own hydraulic system to operate the landing gear, gear doors, and wing-fold mechanism. The system uses a brushless outrunner motor operated hydraulic pump and 3 micro- servo operated valve assembly. I control the ON//OFF function of the pump with a cobbled-together pressure switch using a Robart pressure gage (turkey thermometer style) and micro-switch. Works great! Operation is very scale-like, no bulky air tanks fill the model, and with an 1100mah lipo, 100’s of cycles are possible before recharge is necessary. This system works so well my last four models have been so equipped.
The system operates as follows: (I am using an “open source” BEC. explanation will follow). I have wired the microswitch into the BEC potentiometer wire, (BEC pot controls motor speed). System is pressurized to 120psi. as long as system power switch is “on”. When the pilot calls for an operation, say, “gear down”: pressure drops, prsr indicator stem retracts, micro-switch closes.,, pump starts…..gear comes down….when gear is “down-and-locked”…..pressure rises …. Robart prsr indicator stem extends, micro-switch opens…..pump stops.
I am using an “open source” BEC to control the motor’s ON/OFF status because, “as far as I know” all RC BEC’s require a three- wire servo plug to be connected to a receiver channel, making it necessary to operate a switch on the TX to control the pump/motor. My setup requires no connection of the BEC to the receiver, and no action at all from the pilot other than to operate the LG switch.
PROBLEM. The open-source BEC is uncommonly large and sometimes the pump motor doesn’t want to start. I would love to use an RC BEC but again they all require a connection to the receiver. How can I use a common RC BEC without having to connect it to the receiver?
The system operates as follows: (I am using an “open source” BEC. explanation will follow). I have wired the microswitch into the BEC potentiometer wire, (BEC pot controls motor speed). System is pressurized to 120psi. as long as system power switch is “on”. When the pilot calls for an operation, say, “gear down”: pressure drops, prsr indicator stem retracts, micro-switch closes.,, pump starts…..gear comes down….when gear is “down-and-locked”…..pressure rises …. Robart prsr indicator stem extends, micro-switch opens…..pump stops.
I am using an “open source” BEC to control the motor’s ON/OFF status because, “as far as I know” all RC BEC’s require a three- wire servo plug to be connected to a receiver channel, making it necessary to operate a switch on the TX to control the pump/motor. My setup requires no connection of the BEC to the receiver, and no action at all from the pilot other than to operate the LG switch.
PROBLEM. The open-source BEC is uncommonly large and sometimes the pump motor doesn’t want to start. I would love to use an RC BEC but again they all require a connection to the receiver. How can I use a common RC BEC without having to connect it to the receiver?
