XRAY 2.0mm Graphite chassis for the T1FK'05 - fits 3700/3800 cells

[StevePond]

http://www.rccaraction.com/pics/xray/301114.jpg

Optional 2.0mm thin high-quality CNC-machined graphite chassis for XRAY T1FK'05 as used by all team drivers in low-grip racing conditions. This chassis is 0.5mm thinner than the standard #301112 T1FK'05 chassis, allowing for an overall softer and more flexible chassis; recommended for low-grip conditions and highly recommended for asphalt tracks. The thin chassis is also great to use on low-grip carpet or when using hard compound (low grip) tires (for example, Take Off 27). Battery slots allow batteries to sit deeper into chassis for a lower CG. The chassis fits 3700mAh GP batteries without modification. Includes composite bearing holder.


For more information about this and other XRAY products, visit the XRAY (http://www.teamxray.com) website.

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[RC10racer89]

Steve are the new high capacity batteries really that different in size?

CELL SPECIFICATIONS
Capacity: 3700mah
Length: 1.68in. 42.67mm
Diameter: 0.89in. 22.61mm
Weight: 2.31oz. 65.45gm


CELL SPECIFICATIONS
Capacity: 3300mah
Length: 1.69in. 42.93mm
Diameter: 0.88in. 22.35mm
Weight: 2.2oz. 62.34gm

Those are the specs I've heard on the GP 3300 cells and the new GP 3700 cells.

We're talking like .01 of inch here. I haven't picked up any of the new cells yet, but I currently have three packs of the GP 3300 mah cells for my pan car. Due to my club following ROAR racing rules, we have not yet upgraded to the higher capacity cells. If and when ROAR makes the higher capacity cells legal, do you think they will still fit ok in my carpet knife chassis? If you've tested any of the higher capacity cells already, what was the fit like in the cars you tested?


The new chassis looks nice BTW, I'm sure a lot of folks will be glad to see the new cell configuration remaining on this release. I know a bunch of people hate saddle packs, but I use them all the time in my pan car.. (even though you could theoretically put a 4 cell side-x-side pack in the carpet knife, the saddle packs make it easier to get the pack in and out from under the rear shock. That part is convient but building the packs is made just a tiny bit more tricky :D )

[StevePond]

I don't know where those specs come from, but they look a little off. It's not the length of the cell that's the bigger problem, it's the diameter. I just went through a bunch of cells and the GP3300s were about 22.6mm in diameter and the 3700/3800 cells run about 23mm. That's .4mm larger on each cell. Multiply that over a six-cell matched pack and the spacing of the battery slots won't allow easy installation of a pack made from the larger diameter cells. The overall length of the pack increases by about 2.5mm, which may not sound like a lot, but it's enough that the battery won't sit in the chassis properly.

Another note on the length of the batteries: the overall length isn't as much of an issue as the length of the cell at the shoulder; nearest the OD of the cell where it lays in the chassis. The length of the new cells from the positive electrode to the bottom are roughly the same, but the length of the housing keeps getting longer to the point where the positive electrode is almost below the top of the cell. Does that make sense? Overall length of the cells hasn't changed, but the casing of the new cells is longer, which can require a longer battery slot.