Out standing work dafni! Incredible, must turn alot of heads at the track!

i need that slipperential...

Nice how do you like those ti arms

The Flextek arms themself are incredible. Performance and design.
The bushings they come with, however, are BS. I had to make my own ones. I tried Delrin, Polypropylene and Teflon. So far I only tried the PPs and they still work. Other than that, nice arms.

Yep, the stock bushings don't flex enough. PP could be just right.!

Yet flextech states theyve tried alot of different material combinations in the bushing design..:032: Maybe thats under harsh conditions?

Nothing wrong with the material or flex I think. Mine just had too much play. Now they feel solid, just like stock or RPM arms.

I think the bushings need to be kind of chamfered.

When the arms bend, the bushings must flex in relation to a perfectly straight pin. If the bushings were made rounded in the inside, sort of like an O-Ring, where the center touches and the rest bends away, it could flex without damaging the pin, but also prevent any play, as the bushings could be any material from 6061 or 7075 T6 to Stainless or Titanium.

I see what you mean, BP. Like the bushings on Twinforce suspension arms, for example.
I had the same idea, and made my delrin bushings like this (with a "curve" in the middle) but so far the straight PP bushings held up fine.

The flextek guys must have had a similar idea, they just made their bushings shorter (only like 3/4 into the actual arm) to get the same effect.

Anyway, I have the feeling my arms don't flex much, or not at all, during normal running. I think they only flex under hard impacts.

If I were to make new ones, when my PP or Delrin or PTFE ones fail, I'd do them as you described again, but with brass.

Another update on the truck: Last week I got some parts, and now I can replace the pre-production prototypes of the 1/8 diff cases with the final product! Yay! And I re-wired my ESC, now it's definitely picture-worthy, as it looks nice and clean.

later, guys
DAF

Astonishing work! ASTONISHING!!!

:004: I thought this project was completed a while ago. What the heck was I thinking. Excellent work Dafni.

Lets see those pics Daf! :)

DAF,

I was doing some calculation and found that the sliperential and the buggy diffs gave a rather low gear ratio. Almost dificult to gear it up high enough. WHat KV motor are you running in that and whwat pinion/spurr gear are you running with it? Here is the genaric values I entered, but it seems with the ''average'' setup it is dificult to get the gear ratio up at all. In the below numbers I assumed the smallest revo spur available and the biggest pinion available on the RC-monster store.

That is actually one thing that steered me away from the slipperential. I was concernend about the flexability of the gearing ratios.

How do you have your truck setup? Just curious.

<TABLE cellSpacing=0 cellPadding=2 border=1><TBODY><TR vAlign=top><TD noWrap>Differential Ratio: </TD><TD>3.3076923076923075</TD></TR><TR vAlign=top><TD noWrap>Transmission Ratio: </TD><TD>2.2</TD></TR><TR vAlign=top><TD noWrap>Other Ratio: </TD><TD>1</TD></TR><TR vAlign=top><TD noWrap>Spur Tooth Count: </TD><TD>38</TD></TR><TR vAlign=top><TD noWrap>Pinion Tooth Count: </TD><TD>20</TD></TR><TR vAlign=top><TD noWrap>Total Voltage: </TD><TD>14</TD></TR><TR vAlign=top><TD noWrap>Motor KV: </TD><TD>1867</TD></TR><TR vAlign=top><TD noWrap>Tire Diameter (inches): </TD><TD>5.6</TD></TR><TR vAlign=top><TD noWrap>Tire Ballooning (inches): </TD><TD>.25</TD></TR><TR vAlign=top><TD noWrap>Motor Current Draw: </TD><TD>0</TD></TR><TR vAlign=top><TD noWrap>Motor coil Ω: </TD><TD>0</TD></TR><TR vAlign=top><TD noWrap>Spur/Pinion Ratio: </TD><TD>1.9 : 1</TD></TR><TR vAlign=top><TD noWrap>Total Ratio: </TD><TD>13.82615 : 1</TD></TR><TR vAlign=top><TD noWrap>Tire Circumference (inches): </TD><TD>19.16 inches (486.76mm)</TD></TR><TR vAlign=top><TD noWrap>Total Motor Speed: </TD><TD>26138 RPM</TD></TR><TR vAlign=top><TD noWrap>Vehicle Speed: </TD><TD>34.31 MPH (55.11km/h)</TD></TR><TR vAlign=top><TD noWrap>Effective Speed Rate: </TD><TD>2.45mph/V (3.94kmh/V)</TD></TR></TBODY></TABLE>

I think his motor is a 1950/12. Revs are somewhere below 1200rpms.

Hey, Jeff.
If I use the speed calculator of Brian's with all the data I have, the speed it estimated was 47.91mph..

Is there a possibility it could be faster?

I'm not exactly sure how Brian's calculator takes KV. It may take unloaded KV, which would result in less estimated speed if a loaded KV value was entered, or vice versa.

I think the calculator is a compensation of both, because when I enter Castle's unloaded KV ratings, speed ends up off the charts. However, when I enter in a LMT motor, speeds are quite low (and users on here with the same setup as I entered have gotten much more speed).

Not sure what data you entered Cap'n. Can you use the data output feature on brians calculator and post it so I can see your inputs vs my assumptions. Like I said before... I am only guessing at what setup he might be using and yes by pushing higher motor rpms you can get it up there, but in generall it seems that 1/8 diffs and the slipperential it has a pretty low gear ratio.

I use whatever KV values are published, loaded whenever possible. In a way I like using loaded kv values and then other ways I'd prefer an unloaded kv value.

Using loaded values helps the result be closer to the real thing. However, it seems like a "fudge factor". I highly doubt we load our motors the same way as whatever method they use to measure "loaded". IMO, the calculated result in the right range, but not as accurate.

IMO, using unloaded values is better.... as long as the motor resistance and amperage drawn is known, both of which causes the kv to drop. This kv drop is more accurate because it is specific to the application you are using it in.

You mean that the 1950/10 unloaded is rated for 1307rpm and loaded 1254?

i just read this whole thread and i think my head is going to explode, that is the sexiest revo i have ever seen. I'm working on building an electric revo and have been looking at ideas for a while and i think im going to be dreaming about your truck, lol

"I'm too sexy for my shirt...too sexy for my..."

that popped into my head after I read your post RideIcon LOL

Jeff, the slipperential allows perfect gearing range in my opinion. I aim for 30K rpm motors (1950/6 on 4S or 1950/8 on 5S or something like that) and gear for app 35mph. I was able to get this with the revo slippy done without probs...but I can't remember what gears are on there at the moment. It works, though. Mike and me did the math when we designed it, should work for almost all combos. Not far from an E-Maxx tranny.

I remember when I had the 1950/8 on only 4S, I had to run a 38/20 or something like that, but it worked.

Yes, I have the buggy diffs, not truggy.

If you need any more info, just let me know. Okay, jeff?


All others, thank you for the kind words! Pics are still on page 14, just in case you're wondering :)

Cheers guys
Daf

Its not really the slipperential that lowers the gearing to much, its the combination of the 1/8 diffs and the slipperential that add up to forcing gearing up in the 20T pinion range. The ratio reduction caused by the slipperential by itself or the 1/8 buggy diffs by themselves isnt a big deal, but when you combine these together it really starts to push the pinion size up to the limits of whats available.

I see what you are saying, and I agree, for a 35 mph setup the gearing is no problem really. I tend to use mine for both bashing and track, and I like to gear mine up a bit for bashing. I guess that the slipperential isn't really intended for that anyway. Its is more of a racing setup anyway.

I was just curious what you were running because I was having a hard time figuring out how to gear it for more than 40mph without having to push the motor to higher RPM than I typically like.

Yeah, gotcha. Mike and me designed it with 1/8 scale diffs in mind.
I can check what I run at the moment tonight. But you got it, usually I don't go for 40+.

I guess if you have a motor spinning at 30-35K you should be fine.

Laters, and thank you
Daf

Use bigger tires? :)

I would say smaller? the stock diff has a 37/13 ratio over the 43/13 or 43/10 ratio of the buggy diffs.

so, when and where can i buy a kit? :D1!!!!!!!!

i need one!!!!! why to sway bars up front? and why the off to the side motor mount? after all this i need one now!

Because I want as much on-power steereing as I can get.

On my buggy I like the front sway bar very very thin, and alot of guys I know with truggies take the front one completly off too.

What did you use to make the swaybars? Are the parts off a different truck or are they custom bent metal.

a rod of spring steel.

Correct. Or a wire, so to speak.

Speaking of turning characteristics: this truck has so much off-power steering, it's silly. It can turn so sharp, it's a new driving experience. I love it.
The on-power steering is also fine now, better than anything I could ever get out of my stock Revo conversion.

wheres the new pics???????????? every time i look at the old pics i just start to dream on lol....how much money would u say in in that puppy? 3 grand?

Some pics with the new body and wheels, still need to do some design on the wing.

http://i18.photobucket.com/albums/b1...oxx/sun005.jpg
http://i18.photobucket.com/albums/b1...oxx/sun001.jpg
http://i18.photobucket.com/albums/b1...oxx/sun020.jpg
http://i18.photobucket.com/albums/b1...oxx/sun022.jpg

man that is sooo baddd!!!

Nice paint work there DAF!! With all of the custom work on this thing I feel like it should be hanging in a museum somewhere. But, the beauty of this truck lies in the fact that you run it... and run it hard.

Absolute masterpiece man, you never disappoint!!

I'd love to learn how to do paint work like that. But I suppose it take 2 things I don't have enough of.... Talent and practice time.

Awesome paintjob!!! is this the new rcdc scheme?

Wicked..!

Daf congrat's on the 2000 posts!

Dang daf that is AWSOME .

Thank you Lucky, I knew you'd like it. 2000 post, eh? Nice. I don't post as much as I used too... I rember when there were 50 members :eek:

Yes Rene, this might become the 07 sceme for my own cars. But I can't take full credit for the design... saw something very similar on the web. (Slim, I hope we're cool :) )

Jhautz, you forgot patience and a steady hand :) Thank you!

Oh my.... :004: :004: :004:

The rims and body look so awesome!! :027: