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#1
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Stubby lipo
is any one running in the uk with a stubby lipo if so how do they compare to the stick and saddle layouts
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Fray Bentos |
#2
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Dan Greenwood has just installed a Vampire one recently and can run it through the middle or across the back if he needs to. I am sure he will post soon, maybe with some pictures too (looks really good)
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#3
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Quote:
I've kept the same 65/35 weight distribution as used with other layouts, but it centralises the weight and lowers the CoG, so in theory you get more grip, more responsiveness and less grip-roll. And it gives you the option to run the car a lot lighter with the same WD. I haven't actually tried this yet (still at about 1720g overall as I have a lot of ballast), but I think it will be a good idea indoors where there are no bumps. Had my best result of the winter on Sunday using this layout at Kiddi . |
#4
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Why would a stubby LiPo lead to a lower CoG?
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#5
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The stubby is about 100g lighter than saddles/stick. If you put that 100g back on using dense ballast flat on the chassis, the CoG drops.
Also, with a bit of dremelling the stubby sits a few mm lower in the chassis than a normal stick pack (as the chassis curves up at the edges), so there's a gain there too. This can also be done with saddles, but requires a bit more dremelling. |
#6
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Stubby packs are (often) higher than conventional size packs, and thus result in a higher CoG. The idea of using the shorter packs is not to add extra weight under them, and ending up with an all-round lighter car.
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#7
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Picture of mine attached.
Briefly, comparing to the T lipo setup I was running before with 5400 saddles, the stubby pack mounted forward (the pack is shorter than the gap so need a piece of foam or similair to mount front or back), the balance is within 0.1% further forward that the T setup and back (not side to side) it's 0.2% further back. It's 80g lighter overall like for like. First run will be this weekend at Off Road Wars.
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Nortech is ACE! |
#8
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Quote:
Stubby Lipo (200g and 25mm high) = 200g x 12.5mm = 2500gmm Lead ballast (100g, 3mm high) = 100g * 1.5mm = 150gmm CoG position = ( 2500 + 150 ) / 300g = 8.8mm If a standard Lipo is 300g and 23mm high, its CoG is 11.5mm (half its height). So the (stubby with ballast) has a 2.7mm lower CoG than the (big lipo without ballast). The trick is finding somewhere to put the ballast, but because the pack is so small there's plenty of spare space on the chassis. And you also have the option of not running the ballast and having a nice light car for smooth indoor tracks. Win win . |
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