YR-4 custom buggy conversion

[Mr. ED]

Yup, those are the ones you need.

[Retro rc]

The arms would have to be 5 mm shorter, not longer

I thought about it, but that would make the car 10mm narrower.
I'm not going to rush things and ende up with something that's not satisfactory.
(It's not even like I really need another works too: just having fun with the design and getting the product out to the vintage lovers)

Lol if the arms where shorter the ujs would be further into the drive cups wouldn't they so with the 86-87 mm ujs the arms need to be longer yes and that would make the buggie 10 mm wider, would that still be legal?

[Mr. ED]

True, to be able to use the longer U-J's the arms would need to be longer. And , I measured the width with the wheels mounted: 240mm. So yes 5mm longer arms would work out perfect and I would have enough U-J's for exactly ... 1 car.

My plan, which I already tested in the mean time, was to use the 4 spare shorter U-J's. that way I can build 2 cars with stock dimensioned arms.

[Lonestar]

The thing is, it looks good with these wheels and tires, but anyone will tell you at first sight that you just built an re-re-egress

[rccars4sal]

Im going to cut some arms this week. Initially, they will be stock 91 arm length. If all goes well, I will post pics.

[AllenB.5979]

The thing is, it looks good with these wheels and tires, but anyone will tell you at first sight that you just built an re-re-egress

We'll, the thing is... That NOS BigWig looks great but anyone will tell you at first sight that you just built a re-re-BigWig.

Ha! I'm sorry, I had to. Left that one wide open! I do see what you're saying but it is an evolving design that will probably change when we get these custom arms made. Also... If they don't know enough to tell the difference let em' think that. I build things I like and if I don't win build of the month because it looks too much like an Egress, oh well. Personally I love the car and as a car that I bought new when I was a kid and not last week on Ebay it's irreplaceable and awesome!

[AllenB.5979]

Well, designs are submitted. Waiting on responses with quotes. We shall see....

[Mr. ED]

Stl's are sent to ORB Design too for a quote on the printed version.

[Peakey]

What material are you wanting these arms in guys Nylon or Delrin but he's only got 6.3mm Delrin ATM to cut them in he's looking about $60 NZD a set

[rccars4sal]

I recommend against delrin or acetal. Its more brittle, can possibly break on hard impact. Nylon will be better. Honestly I havent run either for suspension arms,, but I have machined both materials,, and acetal(delrin) is generally not used for structural items. Mostly for gears and fixtures. In practice acetal chips and fails under machining more often than nylon.

[AllenB.5979]

Probably thinking nylon. That's mostly what I've been looking at. If I'm wrong please correct me but isn't delrin more prone to cracking? Delrin is harder than nylon correct? Don't you think in this application a little give from the nylon would be better?

That's NZD as in New Zealand dollars so.... What's shipping from New Zealand to the US going to cost? I'm almost afraid to find out.

[AllenB.5979]

I recommend against delrin or acetal. Its more brittle, can possibly break on hard impact. Nylon will be better. Honestly I havent run either for suspension arms,, but I have machined both materials,, and acetal(delrin) is generally not used for structural items. Mostly for gears and fixtures. In practice acetal chips and fails under machining more often than nylon.

Ha ha ha! I was typing the same concerns at the same time. Glad to see I was thinking along the right lines.

[Mr. ED]

60 nzd is around 40 euro. Really not bad for 4 parts which are all different from each other.
The 2 shops I use for work would never do it this cheap. One would charge the setup cost 4 times on top of the part price. The other one can cut them cheap with his waterjet and then finish of the pockts on the cnc, but they charge12 euro administrative surplus for orders under 100 euro. And neither have the material on stock.
Other subject, nylon or delrin... Any other opiond, liket pet pom or polycarbonate?
Nylon without glassfibre or other additive creeps under load. Banana shaped front arms on the losi jrx-2: Yes, that's why. Further more they'd feel ike the basher stuff of hpi or traxxas. Durable but too souple for a proper suspension setup. And last, if you keep those nylon arms in adry environment they dry oit and become very brittle.
Lastly, 6.3 mm thick is too little I think, for the 3mm hinges and M3 shock mounting screws

[Mr. ED]

damned typo's. Typing on smartphones is still a pain!

[AllenB.5979]

damned typo's. Typing on smartphones is still a pain!

I think we got most of it. We're kinda screwed either way. That is a good price. I haven't heard back on my end yet but I doubt any of them will be that cheap unless I buy bulk. I think your right about the thickness of the delrin so probably the lesser of two evils is the nylon. Don't you think?