Did some power-line construction with a 407 a few months ago, hauling 850kg sections on a 10 metre strop. Elevation varied btw. 2 & 3000 ft and daily temps varying between 15C in the morning to the low 30's in the afternoon. Reduced fuel to about 300lbs when it got hot but never had any problems with the machine. . .The 407 does not like it when you get above 5000ft and into the 30's though. Have been operating one doing fire-fighting with a Bambi bucket and at altitude about 600litres is about the limit.. .Despite all that a fantastic machine! Never flown a B3 either but may get one this season. <img border="0" title="" alt="[Razz]" src="tongue.gif" />