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On Sun, 7 Mar 1999 13:49:17 GMT, "Jeroen Ottens" <ottens@get2net.dk> wrote:
> Then of course there is the weight problem. Lego has only one dimension of
> axles. The rear landingwheels turn in two directions when retracted. That
> is the wheel comes to the front, but also turns so that it can lay flat in
> the wing area. It took me some time to get the mechanics working allright,
> but then I use a special support in the back of the landinggear so that not
> all the weight comes on the axles. As you can see are the suspensions
> totally pressed because of the weight. When I drive around with the model I
> have to be very carefull that I don't make a wrong move, otherwise the
> plane will just crash through the landinggears. The bigger the model, the
> bigger this problem becomes.
I would like to see a detail of how you did the main landing gear. When I
started my (aborted) attempt at an F-14, that is what I started with. Mine
worked very well, rotating 90 degrees as it moved up into the wing root, but it
was not suspended. Mine works very similar to the real thing, as I tried to
copy the actual thing using a type of draglink to perform the rotation.
I still have it together, on the off chance that I may someday get inspired to
continue with the project. :-)
My idea was to go for looks, rather than function as you did. So
mechanically, all I was going to do was the main and nose gear, and the wing
retraction. My idea was to have the landing gears and the wing sweep to be
manually operated by rotating the engine tail cones. I figured they would make
good crank handles. :-)
I suppose I should LDraw the gear assembly (if the pieces are available)
-- Terry K --
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The main landinggear movement is controlled by three gears, 2 24 tooth
normal gears and 1 24 tooth cam-gear (if that's the name of it). One of the
24 tooth gears is locked, the other is the driving one. They are placed
opposite of each other with 2 studs space between them. The cam gear is
positioned to connect both gears. If you still understand this:
The axle of the cam gear is used to orientate the landinggear (confusing
that gearing stuff). I have used some little technic pieces to make a 360
degree ball-joint in between the two normal gears and voila, when you turn
the driving wheel, the cam wheel will roll itself up and rotate at the same
time.
Now you still have to work out the problem of making it turn so that the
wheel is on top of the landinggear when retracted, and you have got to fix
the axle of the fixed gear to make sure that the landinggear is pointed
straight to the front when in standing position, but that's even more
details.
I hope you understand it, otherwise I should get myself some time to reload
(I accidently plugged the drain on my harddisc lately) all the LDRAW stuff
and draw it.
This configuration works well, but it doesn't look like the real thing. So
Terry can you explain or show me how you did it?
Happy building
Jeroen Ottens (private mail)
PS This (private mail) message doesn't appear all the time. This doesn't
mean the message is suddenly approved of by my superiors. It mainly means I
forgot to enter it. I think more official messages can be recognized when
they do appear.
Terry K <legoverse@geocities.com> wrote in article
<36e370ae.575290@lugnet.com>...
<snip>
> I would like to see a detail of how you did the main landing gear. When • I
> started my (aborted) attempt at an F-14, that is what I started with. • Mine
> worked very well, rotating 90 degrees as it moved up into the wing root, • but it
> was not suspended. Mine works very similar to the real thing, as I • tried to
> copy the actual thing using a type of draglink to perform the rotation.
> I still have it together, on the off chance that I may someday get • inspired to
> continue with the project. :-)
> My idea was to go for looks, rather than function as you did. So
> mechanically, all I was going to do was the main and nose gear, and the • wing
> retraction. My idea was to have the landing gears and the wing sweep to • be
> manually operated by rotating the engine tail cones. I figured they • would make
> good crank handles. :-)
>
> I suppose I should LDraw the gear assembly (if the pieces are available)
>
> -- Terry K --
>
>
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On Mon, 8 Mar 1999 19:02:39 GMT, "Jeroen Ottens" <ottens@get2net.dk> wrote:
I think I have a hazy idea of what you described.
Or perhaps a "foggy" idea. :-)
It sounds simple, anyway.
My version is really quite simple, and I will try to do a mostly complete ldraw
version and post it. Better than trying to explain it verbally, which I really
suck at. :-)
Off the top of my head, I can only think of one piece that is missing from
ldraw, and I can fake that. Oh, and there is a Lego rubber-band required to
ensure the drag-link folds in the correct direction when retracting.
The whole assembly is primarily for "looks" though. It would hold a model up
just fine, but would not work well for rolling, as the wheel is not firmly
positioned, and would tend to swing around like a caster wheel.
-- Terry K --
> The main landinggear movement is controlled by three gears, 2 24 tooth
> normal gears and 1 24 tooth cam-gear (if that's the name of it). One of the
> 24 tooth gears is locked, the other is the driving one. They are placed
> opposite of each other with 2 studs space between them. The cam gear is
> positioned to connect both gears. If you still understand this:
> The axle of the cam gear is used to orientate the landinggear (confusing
> that gearing stuff). I have used some little technic pieces to make a 360
> degree ball-joint in between the two normal gears and voila, when you turn
> the driving wheel, the cam wheel will roll itself up and rotate at the same
> time.
> Now you still have to work out the problem of making it turn so that the
> wheel is on top of the landinggear when retracted, and you have got to fix
> the axle of the fixed gear to make sure that the landinggear is pointed
> straight to the front when in standing position, but that's even more
> details.
> I hope you understand it, otherwise I should get myself some time to reload
> (I accidently plugged the drain on my harddisc lately) all the LDRAW stuff
> and draw it.
> This configuration works well, but it doesn't look like the real thing. So
> Terry can you explain or show me how you did it?
>
> Happy building
>
> Jeroen Ottens (private mail)
>
> PS This (private mail) message doesn't appear all the time. This doesn't
> mean the message is suddenly approved of by my superiors. It mainly means I
> forgot to enter it. I think more official messages can be recognized when
> they do appear.
>
> Terry K <legoverse@geocities.com> wrote in article
> <36e370ae.575290@lugnet.com>...
> <snip>
>
> > I would like to see a detail of how you did the main landing gear. When • I
> > started my (aborted) attempt at an F-14, that is what I started with. • Mine
> > worked very well, rotating 90 degrees as it moved up into the wing root, • but it
> > was not suspended. Mine works very similar to the real thing, as I • tried to
> > copy the actual thing using a type of draglink to perform the rotation.
> > I still have it together, on the off chance that I may someday get • inspired to
> > continue with the project. :-)
> > My idea was to go for looks, rather than function as you did. So
> > mechanically, all I was going to do was the main and nose gear, and the • wing
> > retraction. My idea was to have the landing gears and the wing sweep to • be
> > manually operated by rotating the engine tail cones. I figured they • would make
> > good crank handles. :-)
> >
> > I suppose I should LDraw the gear assembly (if the pieces are available)
> >
> > -- Terry K --
> >
> >
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On Mon, 8 Mar 1999 19:02:39 GMT, "Jeroen Ottens" <ottens@get2net.dk>
wrote:
> PS This (private mail) message doesn't appear all the time. This doesn't
> mean the message is suddenly approved of by my superiors. It mainly means I
> forgot to enter it. I think more official messages can be recognized when
> they do appear.
I nsee you're using MS Internet News. Doesn't that have a facility to
automatically incorporate a ".sig" after your post? You could just
have the usual disclaimers: "all opinions expressed herein my own view
not those of my employer blah blah.."
Jasper
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On Mon, 8 Mar 1999 19:02:39 GMT, "Jeroen Ottens" <ottens@get2net.dk> wrote:
> This configuration works well, but it doesn't look like the real thing. So
> Terry can you explain or show me how you did it?
Jeroen,
I have posted an LDraw file to lugnet.cad.dat - "Design study - F14 Main Gear".
It shows it pretty well. You do have LDraw and LDLite installed and
configured to view .DAT files from the server, right? :-)
If you don't, I can toss a bitmap up on a page somewhere. But instruction
files using LDraw are much clearer.
-- Terry K --
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