One local racer found a good solution to a common problem with the XXX-4 and XXX-S style chassis...
The problem is that when you change to use the flat side of the battery bar (either for NiMh stick packs or for LiPo), the battery comes out the side in an wreck, etc...
So - he took an old buggy (or truck) chassis, and cut out the battery "channel" (the sides and bottom) -- then he super glued that to the flat side of the battery bar so that it formed an upside down channel or "cap" for the battery. This protects the LiPo and it also makes it secure so it won't pop out the side...
"If you cannot win, make the one ahead of you break the record."
Biff Racing Team #420 (Ah... The "good old days"...)
The local indoor Offroad Track: The RC Race Barn
TLR22-3.0, TLR22T-2.0, TLR22SCT-1.0