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Iranian Army Bell 214 'Big Lifter'. Builder/pilot - Rob Leigh. The mechanics in this model are over 30 years old and it has undergone numerous transformations over the years. It started life around 1978 and was purchased from Dave Neiman models as a UH-1B Huey 'Iroquois' in kit form from Hirobo. Utilising a 45 size IC engine, it performed well until a light crash prompted my father to upgrade the head to the MkII, extend the blades, upgrade the power plant to an OS 61 FSH and with the purchase of a new Bell 214 Fuselage, it was transformed into a 'HeliSwiss' rescue Helicopter. This was flown for a few years, until she was retired to the loft. In January of 2011, I decided it would be nice to get 'the old bird' back in the air. I completely stripped her down to the last nut & bolt and rebuilt from the ground up. After approx. 400 hours and around seven months she was finally flight ready. She was started for her initial test and it was soon apparent that due to the extra 'scale' weight generated by the cockpit, paint and extra detailing. The old 'OS' was not going to be able to sustain her in the air, without overheating! In this latest re-incarnation, she has now been converted to electric power, utilising the original mechanics, exhaust holes filled and re-sprayed and keeping the original clutch. This gives an authentic sounding spool up, which was the hope with this new design. The heli sports a Scorpion 4035 400KV motor, with a Hawk 120Amp High Voltage speed controller. It is running 2 x 6S 2600MaH packs. My ratio is 10:1 and this gives a head speed of around 1200rpm, although the KV/Cell count is a little too high, as I am only running the throttle curve at about 35%. Ideally it should be around 80% for maximum efficiency. I perhaps should have gone for a 330KV motor and ran it on 10S, as opposed to 12S. Running as above though, the packs, motor & speed controller barely get warm, so it's not really a problem. The choice of using 2 x 6S packs was because I have a T-Rex 500 using the said packs, and I wanted to be able to use the same ones. I probably could have gotten away with a 4025 Scorpion motor as well, as it's got loads of power. But it was difficult to know as it was a bit of an unknown quantity. Rob.
Super slow motion cameras are used to determine how lightning bolts are born. The first of its kind, this completely original footage shows how a lightning bolt forms and eventually touches down. (from Discovery Channel's "Raging Planet")