Hello,
Welcome
If perhaps you can tell us that the intended purpose of the heli is we will be able to recommend something. As it stands... lifting 4 -5 lbs can be done by a .60 size nitro, however other better machines for the job would be the gassers which can fly for longer.
Take care... Azzy
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How much?
JP Bell 47 Twister
Align T-Rex 450 XL (well it was once)
Align T-Rex Airwolf
Align T-Rex 600N Sport
Align T-Rex 600N Pro
Align T-Rex 600e Jetranger
Comming Soon - Graupner AS350 TwinStar