5lbs? thats a lot

what do you want the heli for, wouldnt be bombs eh

60 mins is also a long time would need loads of fuel and with the additional weight overall the heli will have to increase in size a LOT
for students you shouldnt have to make a heli that can fly for 60 mins maybe ask whoeva to reduse the time so the heli wont have to be so huge!

Sabot