ORIGINAL: scooterinvegas
Thats A LOT of weight to add to a 40LA powered plane. I would put a weighted prop nut with a 11x5 apc up front and wedge a flat 4 cell up with the fuel tank. Than will help a lot. That engine does not have much power, adding weight anywhere is going to slow it down. I replaced my 40 LA with a 46 AX, holy crap that woke up my superstar 40! Good luck.
I'm gonna try everything I can to move stuff around. If I have to I have to but I would like to cut the amount of added weight in half at least.