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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › landing gear question
08-18-2008 12:28 PM  12 years ago
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reaper31

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Littleton, CO, usa

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landing gear question
He guys, I am working on the drawing for my NH90 and was wondering if anyone has any suggestions on how to do the main landing gear. On the real thing it has a main strut that is hinged to the fuselage. It is connected to a shock absorbing strut that moves up and down to raise and lower the main gear. My problem is…. How could I get the shock absorbing strut to move up and down? I made a very crude drawing on MS paint to kind of show what I mean… I am at work and do not have access to my autocad  if needed I will post a better one later today but for now this will have to do. Looking forward to hearing your suggestions thanks!!

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08-18-2008 12:59 PM  12 years ago
darrens

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you need to mount the shock to a point which can be moved by a servo, but not directly to the servo as you have no locking mechanism. How about using a typical rc retract, but using the landing leg as an actuator arm. this was you would have a locking mechanism? You would have to cut the leg down a little to reduce travel, but it could workHe who dies with the most toys is the winner!
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08-18-2008 08:33 PM  12 years ago
dcavy

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chicago illinois

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A good place to look is on copter doctors gallery. He was able to help me with the gear for a bell 222. it really works well. I used various sizes of brass and alum. tubing to create a shock absorber and scissor assembly. My hardest problem was finding a small spring that sits inside the shock absorbing tube. Seeing that it was for a trex 450 i am limited to the size of tubing if you want it to look scale. send a pm to copter doctor and he could explain the rest. good luck.
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08-18-2008 09:15 PM  12 years ago
modtron

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Why not locate a copy of the manual for the Graupner Turbine NH90.

I would imagine it's somewhere on the net.

This will show you how they have done the U/C system.

modtron
Oxford UK
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08-19-2008 01:35 AM  12 years ago
reaper31

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Littleton, CO, usa

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hi again guys, thanks for the input,

darrens, i was wondering would you clarify how you would want to use the regular retract? would you have to put a hinge in the leg so it could fold on it self?

Dcavy, i guess i will have to ask copterdoctor for help...again, also do you have pics of your mods?

modtron, i do have a manual for the graupner but the problem is that the drawings are a little crude, it would be nice if someone has a pic of the part used to lock the linkages, it looks simple to do, maybe i could buy the locking mechanism form graupner if i could see what i looks like.

and i kind of thought of something to do please tell me what you think, will it work, or does it need work? basically i want to attach a servo to the strut and have it braced on a block. when the heli gets airborne it should release the pressure on the strut and hang down when im ready to raise the gear i will just move up and the servo should be able to hold the gear while in flight. i attached another drawing. your feedback would be appreciated thanks alot for the input guys!!

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08-19-2008 11:24 AM  12 years ago
darrens

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United Kingdom

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I was thinking that you must have a solution to lock the gear in the in and out position, as does a manufacturers retract, otherwise you are using the servo to hold the gear and that won't be good long term. So, I was thinking you could take an existing retract unit and say cut the wheel off, leaving an arm which moves in an arc just as a servo arm does. This could then be attached to whatever you use to actuate the movement of the shock, almost like a secondary servo for the want of a better term.
looking at your diagram, when the model was on your shelf with the power off, a nudge could cause the servo to release and the gear retract for example, hence my thoughts re some locking device for both up and down position.
Just an idea and my open thinking if it helps
He who dies with the most toys is the winner!
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08-19-2008 12:06 PM  12 years ago
reaper31

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ok that makes sense now, i think i will try and work something our like that and post it to see if thats what you were thinking about. cuz you are right, when there is no power on the servo it could colapse on itself...
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08-19-2008 12:28 PM  12 years ago
darrens

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United Kingdom

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Also, if you had anything other than a soft landing you could take the servo gears out and that would not be fun if it were just one wheel up on one side!!!!He who dies with the most toys is the winner!
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08-20-2008 04:37 PM  12 years ago
dcavy

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chicago illinois

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i managed to find a gear pic that copter doctor had on his uh60 blackhawk same concept though.

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