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Xpress Arrow AT1

Old 05-26-2022, 01:38 AM
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Announced today by Xpress - a "competition grade" shaft drive touring car.

Interested to see what it turns out to be. I'm going to bet on something inspired by the Awesomatix A700.
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Old 05-26-2022, 01:59 AM
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Old 05-26-2022, 01:59 AM
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Looks very interesting from the limited info there is, maybe some type of floating drivetrain?






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Old 05-26-2022, 02:27 AM
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Originally Posted by rc_square24
Looks very interesting from the limited info there is, maybe some type of floating drivetrain?
Yes I think you're right, only moored to the chassis at the motor mount. May well reduce torque effects but I'd be slightly concerned about wear/damage caused by the additional free movement.

The rest is vanilla short-arm touring car c. 2012. I thought Xpress would be taking the opportunity to jump on the Awesomatix bandwagon. Looks like I was wrong.
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Old 05-26-2022, 05:20 AM
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Some information on their blog:

https://www.rc-xpress.com/blog/Arrow...ouring-Car-Kit

I was quoted 395USD as preorder price by an Xpress contact. Just waiting on the instructions manual before I decide on ordering one
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Old 05-26-2022, 08:05 AM
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Should be a great chassis for vta and slower classes, just under $500 in the US
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Old 05-26-2022, 08:17 AM
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Note: The information in the following email is meant for your eyes only at this stage, please do not share the following information before the 2nd of June 2022.
Guess xpress should limit who they send info to LOL

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Old 05-26-2022, 10:08 AM
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I love it. Did not expect this.
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Old 05-26-2022, 10:43 AM
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Originally Posted by moparSRT
Should be a great chassis for vta and slower classes, just under $500 in the US
Waiting on Bert's approval
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Old 05-26-2022, 11:34 AM
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Looks like the chassis is fully symmetrical for left or right side motor mounting?
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Old 05-26-2022, 11:45 AM
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Ther'es.. a lot going on here. First, that chassis looks like it's using "completely normal" bulkheads. Second, it looks like you could, if you really wanted to, chose your motors rotation direction.

I wonder if these have less drivetrain friction than a belt. You don't have to deal with the belts hysteris, and you're looking at two more bearings. This would be a fun one to dyno.
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Old 05-26-2022, 01:27 PM
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Originally Posted by Nerobro
Ther'es.. a lot going on here. First, that chassis looks like it's using "completely normal" bulkheads. Second, it looks like you could, if you really wanted to, chose your motors rotation direction.

I wonder if these have less drivetrain friction than a belt. You don't have to deal with the belts hysteris, and you're looking at two more bearings. This would be a fun one to dyno.
How would you change the motor rotation direction without the car going backwards? The gearboxes don't allow you to reverse the diff orientation.

Regarding efficiency, the rule of thumb is that shaft is more efficient at lower RPM and belt is more efficient at higher RPM.
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Old 05-26-2022, 02:32 PM
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Old 05-26-2022, 03:26 PM
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Nice looking shaft drive car, with a nice sliding motor mount...Judging by the shape of the rear gear case, it has a gear diff, which is perfect...It looks very though with steel everywhere, but there could be a weight penalty...Hopefully it comes with front dcj drives, and a front spool...Welcome Xpress to the shaftdrive rc world...
APPROVED !!!LOL !!!
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Old 05-26-2022, 03:52 PM
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Originally Posted by gigaplex
How would you change the motor rotation direction without the car going backwards? The gearboxes don't allow you to reverse the diff orientation.

Regarding efficiency, the rule of thumb is that shaft is more efficient at lower RPM and belt is more efficient at higher RPM.
I didn't look closely enough at the gear cases. I thought they could be flipped.

That "rule of thumb" doesn't make sense. Both from a hysteresis perspective, and as is demonstrated by drivelines in real life.
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