I have been flying a 1/4 scale Tiger Moth for the past 5 years on electric power. It's not the Flair one, but an ARTF from a German shop. Mine weighs around 9kg and flies very realistically on a power system that develops 1500 Watts. Most flying is done on 1/2 throttle and I normally only use around 2/3 power for realistic-looking takeoffs. There's little point describing my power system, as it's now very old and out of date, but it's a Plettenberg motor, with a Modelair-Tech beltdrive. Prop is 20 x 10 and battery pack is 28 x Sanyo CP3600CR cells. Pack weight is around 2.5kg and you WILL need just about this much weight up front in order to achieve correct CG. Any more questions, just ask or PM me.