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elecrtic retracts


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Posted by bert baker on 21/01/2020 17:17:41:

As I understand retracts, there not designed to hold the oleo and wheel up on the screw jack or to hold it down when deployed.

they are mechanically locked up and down

Indeed they are. I've just had a look inside a spare one I have, and sure enough it has tiny microswitches at each end of the screwjack travel. It would be possible to introduce something in there to activate the microswitch early and thus stop the movement but it would be very fiddly to do. I will carry on with them moving through 90 degrees.

So, to answer my own question-yes, it's possible, but not very do-able

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Posted by Yorkman on 21/01/2020 22:32:58:
Posted by bert baker on 21/01/2020 17:17:41:

As I understand retracts, there not designed to hold the oleo and wheel up on the screw jack or to hold it down when deployed.

they are mechanically locked up and down

Indeed they are. I've just had a look inside a spare one I have, and sure enough it has tiny microswitches at each end of the screwjack travel. It would be possible to introduce something in there to activate the microswitch early and thus stop the movement but it would be very fiddly to do. I will carry on with them moving through 90 degrees.

So, to answer my own question-yes, it's possible, but not very do-able

and not to be recommended! The locking action either end of the movement takes the strain off the screwjack location in the gearbox. Any excess load on the leg between locks can pull the threaded rod out of the gearbox leaving the leg flopping around, I've had a couple of units that it's happened to.

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