Margouillat AR60

[Haastnooit]

Don't know if others feel the same, BUT I Always feel like I am watchting the future in Stephans buildthreads :mrgreen:.

I saw the first milled out skid, first CF upperlinks, first custom tranny, first rigid rear driveshaft and probably some other parts we did not cath on to yet in one of his builds "thumbsup"

 

[TotoRax]

Looks fantastic as usual. Have you had more time to rest the counter rotating transmission?

I think that the profit is not interesting as envisaged, but I will remake tests with this frame.

Your ideas and the implementation are admirable, Stefane. Impressively work"thumbsup"

Thanks, I am glad to see that also you prepare a sportman :mrgreen:"thumbsup"

Don't know if others feel the same, BUT I Always feel like I am watchting the future in Stephans buildthreads :mrgreen:.

I saw the first milled out skid, first CF upperlinks, first custom tranny, first rigid rear driveshaft and probably some other parts we did not cath on to yet in one of his builds "thumbsup"

Big thanks

 

[TotoRax]

Hi,

After much of tests, with the back bridge in all the directions, I always have torque-twist… Contra-rotative trany is not the solution. That creates more problem than that does solve any. Exit contrarotating transmission, return to the classical R2V2 :mrgreen: This week, I received my rear axle of AR60 and I tested. And with the AR-60 axle and exactly the same configuration, the torque-twist disappeared :shock:

Thus complete reassembly of rig !

R2V2 transmission = 51g.


The frame = 59g. I use only 2 cross-pieces, the transmission takes part in the rigidity of the frame.


Frame/transmission/motot(stubby)= 245g




I have 8cm under front of the skid and almost 10 cm with highest of the rear links. Still, I gain a little in height (compared to AX10 version), without anything to lose of stability.



The Mikado of the rear links, hidden in the medium there is a driveshaft :roll:
There remain the rear CF links to be made and a support 4 links.


The machine weighs 1540g RTR, without body, but last optimizations of weight should almost compensate for its weight.
The weight bias is 896g on front and 644g in the rear. What gives a bias of 58.2% on front and 41.8% on the rear, I am a little light on the front one but I will run in the state, the machine seems very well to function thus.

First rapid tests this evening and the torque-twits finally completely disappeared :mrgreen:

Conclusion, the mix of AX-10 axle and AR-60 is not a good idea

@+

 

[MRCrackhead]

Wow, 8cm at the skid and still no sidehill loss....

Brilliant!

Your breakover angle far exceeds the norm of most current rigs, yet you pull it off.

Great job.

 

[TotoRax]

hi,

Thanks MRCrackhead ;-)

A very short video of test : Here

Nothing original but some rock which I know well, to evaluate the behavior.
For the moment, I wait the body, it should arrive… one day…

 

[banners]

Very clean looking and looks to be a great location, it must inspire to have such a playground "thumbsup"

 

[TotoRax]

Hi,

Very clean looking and looks to be a great location, it must inspire to have such a playground "thumbsup"

Thanks ;-)

Small update of the WE, rear 4 link. I did not like my first assembly, it was right an assembly provision to test the geometry, and it was a stacking of parts. Thus once the validated geometry, one transfers all that and one remakes a new more “optimized” part




Before


The new part






As a result the rear upper links are more triangulated, to see whether that with an impact significance on the behavior. But the profit of point is of -12g (in top of the centre of gravity). The CF links are “drying”.
The weight in the state should approach the 1500g, I expect the arrival of the carro to lean more precisely on the weight bias.

@+

 

[TSK]

Very nice work"thumbsup"

 

[TotoRax]

Very nice work"thumbsup"

Thanks

I test new front lower link. This link are simple, I replace the threaded rod of 4mm by carbon round and which I glue (like the upper links)

Classic link

New lower link, 12g of less.

For the moment the links are rather solid, but it is necessary to make much more test to validate the idea.

I have just received my titanium stems of 4mm, therefore if the links breaks, I can remake them. On the way another idea for step which the links hang.

You needs for that a very specific tool

Not need for explanation for the continuation :mrgreen:

 

[Crawllife]

Great idea!! I just acquired a set of links that my beloved Dlux sliders won't fit on. This is my steal of the day! Thank you!

 

[CrawlerPro]

You needs for that a very specific tool

Not need for explanation for the continuation :mrgreen:

GENIUS!!!"thumbsup"

 

[josh6575]

Where can I get some of the drive shafts you are using? I really like how you mounted the servo and have used your idea with some of the dlux axle trusses. Great idea you had there it really got the cg down low.

 

[TotoRax]

Hi,

Thanks for your comments "thumbsup"

It's SDI Shaft : PROPPELER SHAFT (5mm to 5mm)

 

[TotoRax]

Hi,

I come to remove dust on this post :roll:
Margouillat with evolving with many tests and modifications.


I wanted to use a body, but finally I prefer the bodyless. Thus achievement of the upper part in delrin.
The idea is to have a relatively flexible part, to box the shocks. At this place I prefer the delin compared to carbon.
Once again, large a thank you with Tomy for the excellence of its work. The parts very precise and are very well finished.








Then another large building site, the rear axle. Gerry with his project : a crawl with less 3lbs with launching a big big challenge…
Honestly to make a complete axle with less than 90g is really incredible. I weighed different the parts: spoll, gears, bearing, case of differential and it's already in 90g :shock:
Thus more modestly, I test another approach, not having a 3D printer at disposal.

The project starts with the butchery of a AX-10 axle :mrgreen: I passed it to the milling machine to eliminate the useless material and especially to release from space for the carbon support.



Carbon parts, by Tomy "thumbsup"


Assembly of the elements. Thanks at CREEPERBOB, for its rear titanium shaft.







In situation





The weight of a AR60 rear axle is 165g, this axle weighs 129g, that is to say 35g of less.


The final weight of Margouillat is of 1376g (of which 72g of weight in front)

Now, I have too much weight on the front, it is necessary to remove the weight, therefore RTR weight and balanced (60/40) will be of 1300g approx. - 2lbrs 14oz.

Afer some quick tests, the rear axle functions correctly, it supports the shocks, maintaining to see in time...

Thank you with those which read until the end this post

 

[winnerone23]

Absolutely INCREDIBLE!

I'm lost for words past that and goin to wipe my chin..

 

[josh6575]

That is some astonishing work on that rear axle. I used your idea on my front axle servo position. I would like to follow your lead on the rear axle. Nice work. I like your unconventional approaches.

 

[MRCrackhead]

Holy cow!

That is............................................................................wow!

What I mean to say is....................................................wow!

Maybe more accurately described as...........................wow!

 

[Colgout]

............





















lost of word........the master has done it again.

 

[Tomy]

Very innovative ideas once again!!!

Are you still without torque twist with the cf rear axle?

 

[McTwist]

That is just cool. Good job!!!


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