Lado mechanical retract systems - feedback
01-15-2008 | 07:50 AM
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From: farnborough, , UNITED KINGDOM
Lado mechanical retract systems - feedback
Is there any feedback on the Lado mechanical retract systems in the jet community yet?
I build jets on a commission basis and have always been concerned about the air systems used to work gear etc, it is very time consuming to instal, requires a high number of 'parts' and control systems to make it work well (sequencers/air restrictors etc..) and unless managed seems to deliver untold stresses to the airframe.
A mechanical system seems far more basic, uses fewer components (less chance of failure) and provides a much more scale like operation.
I have also noticed a new range of rams from Servocity, which would I can also see a use for in jets - canopy opening, air brakes, gear doors etc.....
Any feedback on these technologies would be very welcome.
Links for those who need them.
marc.
[link]http://www.servocity.com/html/servo_actuators.html[/link]
[link]http://lado-tech.com/index.htm[/link]
I build jets on a commission basis and have always been concerned about the air systems used to work gear etc, it is very time consuming to instal, requires a high number of 'parts' and control systems to make it work well (sequencers/air restrictors etc..) and unless managed seems to deliver untold stresses to the airframe.
A mechanical system seems far more basic, uses fewer components (less chance of failure) and provides a much more scale like operation.
I have also noticed a new range of rams from Servocity, which would I can also see a use for in jets - canopy opening, air brakes, gear doors etc.....
Any feedback on these technologies would be very welcome.
Links for those who need them.
marc.
[link]http://www.servocity.com/html/servo_actuators.html[/link]
[link]http://lado-tech.com/index.htm[/link]
01-15-2008 | 11:23 AM
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From: Henderson, NV
RE: Lado mechanical retract systems - feedback
ORIGINAL: marc s
Is there any feedback on the Lado mechanical retract systems in the jet community yet?
A mechanical system seems far more basic, uses fewer components (less chance of failure) and provides a much more scale like operation.
Any feedback on these technologies would be very welcome.
Links for those who need them.
marc.
[link]http://www.servocity.com/html/servo_actuators.html[/link]
[link]http://lado-tech.com/index.htm[/link]
Is there any feedback on the Lado mechanical retract systems in the jet community yet?
A mechanical system seems far more basic, uses fewer components (less chance of failure) and provides a much more scale like operation.
Any feedback on these technologies would be very welcome.
Links for those who need them.
marc.
[link]http://www.servocity.com/html/servo_actuators.html[/link]
[link]http://lado-tech.com/index.htm[/link]
01-15-2008 | 11:55 AM
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From: Longwood ,
FL
RE: Lado mechanical retract systems - feedback
Marc,
I have looked at those and think they are pretty slick too, but they have a mjor drawback. How do you operate the landing gear doors?
Lado has not addressed landing gear doors, possibly because of the variables in as many designs as there are in the jet marketplace. Their equipment looks pretty good, and certainly has a spot in the marketplace, but is better suited to designs with straight landing gear legs and no (or very simple) landing gear doors. Try to make that fabulous MiG you built operate the landing gear doors without pneumatics.
Air cylinders are a very simple, light, reliable method for for the operation of scale landing gear doors. And, they are relatively maintenance free. Properly installed and adjusted air systems impose NO undue stresses on the airframe.
Install the Lado system for the gear legs, and add an air system for the doors?
Design and fabricate a system of levers, arms, bellcranks and pushrods to take the place of an airtank, valve, and hose?
Not me. Lots of extra work and complication. Lower parts count too.
I have designed and fabricated mechanical contraptions in the past to open and close doors, and they were not as reliable or simple as air cylinders. I sure was happy when I discovered small air cylinders....Hmmmm, I wish I had thought of that first.
I remember the words of a long gone aviation pioneer, whio said "Simplificate and add lightness". William E. Boeing.
(This statement has also been attributed to Colin Chapman, Henry Ford and Billy Mitchell)
Seems to fit pretty well.
I don't want to deal with another battery or more wiring in my jets either. Two for the airborne RC system, one for the ECU, one in the transmitter, spares, cnargers, cords, wires, connectors, etc......enough is enough.
Harley Condra
BVM REP
JetCat REP
I have looked at those and think they are pretty slick too, but they have a mjor drawback. How do you operate the landing gear doors?
Lado has not addressed landing gear doors, possibly because of the variables in as many designs as there are in the jet marketplace. Their equipment looks pretty good, and certainly has a spot in the marketplace, but is better suited to designs with straight landing gear legs and no (or very simple) landing gear doors. Try to make that fabulous MiG you built operate the landing gear doors without pneumatics.
Air cylinders are a very simple, light, reliable method for for the operation of scale landing gear doors. And, they are relatively maintenance free. Properly installed and adjusted air systems impose NO undue stresses on the airframe.
Install the Lado system for the gear legs, and add an air system for the doors?
Design and fabricate a system of levers, arms, bellcranks and pushrods to take the place of an airtank, valve, and hose?
Not me. Lots of extra work and complication. Lower parts count too.
I have designed and fabricated mechanical contraptions in the past to open and close doors, and they were not as reliable or simple as air cylinders. I sure was happy when I discovered small air cylinders....Hmmmm, I wish I had thought of that first.
I remember the words of a long gone aviation pioneer, whio said "Simplificate and add lightness". William E. Boeing.
(This statement has also been attributed to Colin Chapman, Henry Ford and Billy Mitchell)
Seems to fit pretty well.
I don't want to deal with another battery or more wiring in my jets either. Two for the airborne RC system, one for the ECU, one in the transmitter, spares, cnargers, cords, wires, connectors, etc......enough is enough.
Harley Condra
BVM REP
JetCat REP
01-15-2008 | 04:53 PM
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From: farnborough, , UNITED KINGDOM
RE: Lado mechanical retract systems - feedback
Harley,
Take your point, although I think in time this system is going to appear in more larger scale planes/jets, especially as I know they are already working on a sequencer to run many more outputs which can all be phased etc....
Regards stressing I meant that the air driven gear as far as my experience shows has no respect for the mounts when thay bang closed and open - even with restrictors in line the gear systems thump the end stops pretty hard in my oppinion. It would be nice not to have that.
I am about to re-fit a large MB339, and this I think it is destined for a 'hydraulic' system - which fills me with fear, oil everywhere, more pumps, batteries you know the rest
Just finished a Bobcat Composite for a UK client - nice jet, had real fun doing that one.
marc.
Take your point, although I think in time this system is going to appear in more larger scale planes/jets, especially as I know they are already working on a sequencer to run many more outputs which can all be phased etc....
Regards stressing I meant that the air driven gear as far as my experience shows has no respect for the mounts when thay bang closed and open - even with restrictors in line the gear systems thump the end stops pretty hard in my oppinion. It would be nice not to have that.
I am about to re-fit a large MB339, and this I think it is destined for a 'hydraulic' system - which fills me with fear, oil everywhere, more pumps, batteries you know the rest
Just finished a Bobcat Composite for a UK client - nice jet, had real fun doing that one.
marc.
01-15-2008 | 05:17 PM
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From: Longwood ,
FL
RE: Lado mechanical retract systems - feedback
Marc,
I have a hydraulic conversion kit that is probably 20 or more years old.
It is the "Hydra Loc" system, which uses an "air over oil" accumulator, as in full scale practice to hydraulically lower/extend the old Rhom Air systems, or other pnuematically actuated systems. No pump was required, as the accumulator bladder did the work.
It was supposed to lift heavy LG legs and wheels with ease. Anyone else remember them? I never got around to using it.
The only other hydraulic LG system that I can think of are the Composite-ARF MiG 29 systems, that were nothing but trouble, until after an extensive re-design. Not very many of them are out there right now...I think that Matt Carrol has a set that he has in working order.
Have you acquired a hydraulic system for thee MB339?
Harley Condra
BVM REP
JetCat REP
I have a hydraulic conversion kit that is probably 20 or more years old.
It is the "Hydra Loc" system, which uses an "air over oil" accumulator, as in full scale practice to hydraulically lower/extend the old Rhom Air systems, or other pnuematically actuated systems. No pump was required, as the accumulator bladder did the work.
It was supposed to lift heavy LG legs and wheels with ease. Anyone else remember them? I never got around to using it.
The only other hydraulic LG system that I can think of are the Composite-ARF MiG 29 systems, that were nothing but trouble, until after an extensive re-design. Not very many of them are out there right now...I think that Matt Carrol has a set that he has in working order.
Have you acquired a hydraulic system for thee MB339?
Harley Condra
BVM REP
JetCat REP
