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Xpress Arrow AT1

Old 06-03-2022, 07:08 AM
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Originally Posted by gwhiz
I am still having some difficulty understanding how the Express AT1 design solution differs from an A700 FFG. Specifically the drivetrain torque isolation.

I had an A700 before, but I never had the FFG system and have only seen it in person very briefly. Can someone help me understand this, please? Thank you very much.

Cheers
https://www.youtube.com/watch?v=qGthUZePBUg
At a high level, the A700 suspended the drive shaft and gearboxes from the top, allowing them to move around slightly. On the Xpress they appear to bolt to an independent spine that runs down the middle of the chassis. If you want to know more about the A700 system you're better off looking in the separate thread for that car, or download the manual.
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Old 06-03-2022, 08:28 AM
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One thing that caught my eye with this a700 video: the bulkhead seems to flex fore/aft when changing motor speed. The AT1 has a topdeck and probably won't flex so much in that direction. So maybe the AT1 could be more stable...
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Old 06-03-2022, 08:51 AM
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Originally Posted by 4k4m3
Could you please explain a bit about what torque steer issue is, as well as how chassis flex plays a part, and why you think it's very different from say a A700? I'm new and trying to understand how this impacts the car and how it's all interconnected or not. TIA.
Regarding the chassis flex aspect... normally shaft driven TC's can't enjoy the same flexible freedom as belt driven TC's due to the effects of the drive train under load/binding/weird forces etc. This area of performance should be slightly better on the AT1 and again different from the A700... motor/motor mount placement is different (further forward) on the AT1 and flex is allowed between the spur gear assembly and rear gear box. I'm not saying it's better than the A700 (it had many other tricks in the bag) - just different from anything else we've seen on a shafty TC.
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Old 06-03-2022, 09:32 AM
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Xpress Arrow AT1 drivetrain torque isolation does not interfere with chassis motion, a little bit differently from other chassis.😃
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Old 06-03-2022, 10:12 AM
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Originally Posted by h2e
One thing that caught my eye with this a700 video: the bulkhead seems to flex fore/aft when changing motor speed. The AT1 has a topdeck and probably won't flex so much in that direction. So maybe the AT1 could be more stable...
You could run a topdeck on the Awesomatix as well
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Old 06-03-2022, 11:18 AM
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with the amount of people posting here -- it is clear we are all interested to see if this lower 'spline' method is going to work or not. the R/C world is watching
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Old 06-03-2022, 02:13 PM
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A more detailed video of the AT1 floating driveline would help us all here....It is hard to figure out with the limited photos and videos out there: please increase the lighting on the videos !!!
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Old 06-03-2022, 02:32 PM
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Originally Posted by bertrandsv87
A more detailed video of the AT1 floating driveline would help us all here....It is hard to figure out with the limited photos and videos out there: please increase the lighting on the videos !!!
they are in the process of hiring the film crew for xray
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Old 06-03-2022, 04:29 PM
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If Felix is hitting 12.4s 12.7s - “belt car” with a shaft car at Valkaria, The car is gonna sell
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Old 06-03-2022, 07:55 PM
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Originally Posted by h2e
One thing that caught my eye with this a700 video: the bulkhead seems to flex fore/aft when changing motor speed. The AT1 has a topdeck and probably won't flex so much in that direction. So maybe the AT1 could be more stable...
The gearbox was actually floating independently to the bulkhead. The A700 had the option of running with and without a top deck.
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Old 06-03-2022, 08:23 PM
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Originally Posted by JB Lagdao
I think I just might. Unless 3racing drops there ultra cero. Did you get worked by the mid motor?
No I was the mid motor that worked the standard one lol
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Old 06-03-2022, 11:19 PM
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No need for a film crew when you can use an iphone13 or other similar device...Hopefully these phones are not out of reach for most xray racers here, after all the crazy expenditures on xray parts...I am sure the At1 will be easier on racers' wallets....
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Last edited by bertrandsv87; 06-03-2022 at 11:30 PM.
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Old 06-06-2022, 08:21 PM
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https://www.rc-xpress.com/manuals-se...AT1-Manual.pdf

Manual now online
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Old 06-07-2022, 12:34 AM
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Pretty smart and cost-effective design. It looks like the bulkheads are from a belt drive chassis, although it's nothing from their current lineup - maybe the belt variant is coming soon?
Having shaft and belt drive cars based on an identical platform would be pretty interesting.
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Old 06-07-2022, 01:17 AM
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