Axle is one control link, rods are 2 links, and board to which the rods and axle connect is another link which is static. It could be 3 if your rods and axle is suspended in the air…
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ok you win… you are the smartest man in the universe… i’m over it…
No one is smartest here. Everyone just trying to help, just someone has some issues with other people opinions
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I can quickly clear this argument up. Yes it’s technically 4 links. Not in the world of vehicle chassis dynamics where racing is concerned. The NKP 3link works based off this principal below. With the exception of that the panhard bar (track bar) and the top link (torque link) are replaced by the fixed 3rd link center spherical. Moment center (Roll center) in my design becomes fixed to the center line of the axel for the roll pitch and yaw moments to happen in the same place. So 3 forces applied to the Yaw pitch and roll moment center of the axel plane. 3-LINK. There it is
And I still don’t approve of anyone using my design for profit. It is property theft.
DIY is still cool.
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Is the 3/4-link truck design for skate use patented?
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It can’t be patented once it has been made public 
Either it was beforehand or it is too late for that. Keeping this matter to a gentlemen mutual understanding is the best now.
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Hello @MoeStooge
Have been working on my designs a bit more, however since i have never ridden a 3 link truck i have no idea what angle is the best for stability or carving. I have some rough ideas, but i dont wanna “guess”
One thing I noticed is that you extend your liks nearly all the way till the wheels. Now because my gearboxes are there its hard to fit the liks that close near the wheels, now what happens when i mount the links a bit farther away, on the hole in the gearbox.
Do you have any advice on how to continue my design?
An answer is appreciated, but i understand if you feel like you dont wanna share your experience.
also dont mind the baseplate, thats a work in progress still.
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I reccomend you take this PM. This isnt the right thread nor atmosphere 
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yeah true i guess, he knows that im doing this, im not doing this for profit in any way. And therefore my designs are public aswell, if he wants to answer private i am fine with that.
Im fine with any answer hehe
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Ofcourse! I have no doubt that what youre doing is good, it just comes off a bit tone deaf in this thread, especially with some of the previous things said.
That being said, i really hope you manage to get the 3 link design down, i think it is legitimately such a cool design and ive been thinking of way to DIY it aswell
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Maybe a bit tonedeaf, but i think this is the 3 link truck designs thread. Everybody that built a design like this should share it here with eachother and teach everybody what their experiences/ findings are. Not bicker about if they wanna sell it or not for profit.
I asked @evoheyax about those swivel arm angles and didnt get a response. I asked @MoeStooge if i should keep him up to date on my progress and he answered “Do it in public” so thats what i do, and this feels like the best thread for it. No need to claim these designs for myself (feels weird saying as an industrial design engineer though)
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I am not a patent lawyer. But my job in medical device design and production has me dealing with them regularly. I have learned a few things from these interactions.
If you plan on having ANY design protection you better have a patent.
If you don’t get a patent, you don’t get to decide who re-produces your design or a similar design.
Your patent will only protect you in the countries that respect that patent.
If you are awarded a patent you better have $$$ to defend it.
It sounds like a grim reality.
But it is reality.
For me this forum is all about sharing designs an cool stuff. Please keep sharing.
But if your goal is to start a business or to protect your IP, apply for a patent, and THEN share your tech here.
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Thanks for this.
@evoheyax I hope you continue working on your designs in whatever capacity you desire. You too @Bavioze.
Please don’t let people guarding a cookie jar that doesn’t exist dissuade you.
You don’t need anyone’s permission.
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sais the sellout 
just kidding big man
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The further out in the axel the pick-up point is the more control the link has over the axel. You can move them inboard but as you do you lose that leverage control. Angle wise the input deck plane would be considered zero in relation to the rod angle input. 45deg of arm and will make a real carvy setup. DIY 
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do you think i can make a stable ride with the rods inwards like this?
i wanted to make it adjustable a bit for more carve/ speed, i think i will make the holes so that i can decrease this angle to less than 45 degree then.
also does this angle matter a lot for steering?
if so, should it be a bigger or a smaller angle?
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The most important thing is to realize the bolt hole centerline of the radius rod spherical is at a right angle to the radius rod. Rod ends must not bind in any way during axel articulation.
Rear @near zero front at 25deg keeps us pretty stable at 50+mph. 45/45 is really carvy. 45/20 is a good 35mph angle set
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stiffer bushings would also help with stability right?
You don’t have any legal leverage, but the bar of what’s honest and what’s scummy isn’t set by the law.
I think a creator has certain rights over their design, even if the law doesn’t respect it.
For instance Plagiarism won’t get anybody arrested, but it can very quickly get you expelled from any school, or fired if you’re a journalist.
If Moe wants to treat this design like a non-commercial share-alike licence, well nobody will have any legal obligations to respect it of course. But I think not respecting it would be disrespectful to Moe and counter to the type of community I’d rather be a part of.
DIY sellers is a pretty grey area. But if some company came in with real money from investors to push around, and tried to post here and promote a blatant copy of anybodies hard work, I’d think we’d have an obligation to raise a stink about it.
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