Rippah
Posts: 17
Joined: 1/19/2004
From: Sale, AUSTRALIA
Status: offline
|
quote:
ORIGINAL: mr_matt
quote:
ORIGINAL: Rippah
Does the plaining and shrink links work? I can't tell if the knuckle rotates. I
Hi Rippah,
You might be able to help me with something. I have been trying to understand how the F-18 gear work for a long time, as you said it is very tough to visualize, but I have these beautiful scale models from Paul to use for help!
So Rippah, I think I understand the geometry of how the gear leg goes up and down in the wheel well, but I do not understand how this !QUOT!knuckle!QUOT! you are referring to works.
If you look at the picture, is this the !QUOT!knuckle!QUOT! I have marked? And if I understand correctly, the linkages somehow pull the top part of the knuckle around, in the arcing motion I have noted? Is this correct?
Now if this is correct, my guess is that the axle for the wheel runs in a different axis than the knuckle moves in, like I have shown in the drawing. So that when the knuckle is rotated (in that same arc) the wheel moves in a different arc, for some reason...is this correct?
And if THIS is correct (little chance at this point, I know!) then what causes the linkages to rotate the knuckle...is it upon retraction, or upon compression (squat) of the strut, or both.
the reason i ask is that all of the model scale gear (I know of) in the market do not have this rotating knuckle, and I am trying to figure out why. The model scale has a MUCH narrower track than the full scale, and perhaps this knuckle is the key.
Thanks for listening to the rambling!
Mr Matt, I'll try and shed some light this the best way a Radio Technician can, I other words I don't specialise in Landing gear. But I can only tell it as I've seen it done when the A/c is jacked and retractions carried out.
The two control rods that I refered to as the plaining and shrink links connect to the latch that locks the axle in place when the a/c MLG (main Landing gear)is down and when WOW (weight on wheels) the wheels track straight and everything is square. The magic happens with the the a/c goes WoffW and the MLG start to retract. The plaining and shrink link unlock the axle !QUOT!knuckle!QUOT! and the wheel assy rotates aft and out at what looks like 45 degrees to its WOW position and as the MLG retracts aft at 45 and locked away. Thats the best way I can roughly explain how the wheel moves through its 90 degrees. But when you look up in the wheel well its still doesn't look as if it should fit up in there.
I hope this answers your questions, but if the is an Aircraft Technician (black hander) out there feel free to jump in and make this mud a lot clearer.
Rippah
|
Printable Version
All Forums >> RC Airplanes >> RC Jets >> RE: Yellow Aircraft F/A-18 Twin! 
RE: Yellow Aircraft F/A-18 Twin! - 
. 
