My plastic B4, with an Orion 3800 LIPO weighs just on 1543 grams ready to go. Which is give or take 5 grams different to last year with NIMh's.
To get it up to this weight I have used Rymart Racing brass front bulkhead and rear anti squat block. At present I have two sheets of tungsten under the battery which are 139mm x 47mm x 0.42mm which adds around 100 grams, and there is space to fit another sheet of the same size adding a further 50 grams if I feel like it.
I think some of it will come down to where you can put the weight and how high some of it goes in the chassis, using the tungsten plate has kept the weight low down, and with the Orion 3800 I haven't had to modify anything to get the battery strap in which was important for me as I hate having to spend time filing things that have been molded to supposedly fit the application!!!
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