Sorry. My c.g. is at 5" aft of the l.e. not 5 3/4. On the fourth flight when I landed the weak landing gear colapsed and the blind nuts pulled through the lite ply landing gear plate! I didn't add lead to the nose. I just added a slimline muffler and heavier TNT gear plus a new landing gear plate of good grade 1/4 ply with aluminum angles on the top side in the fuse for the gear to bolt to. It lands very nice and has no slow speed tip stall tendency. I think 5 " is safe. I need more stick time to check 3 D control throws and c.g.