Bryan,

NP...My take of the article was the flap-spoiler that was new then and has application today. It can be slaved to throttle for those pesky vertical down legs in some of the current schedules

Talking F3A The Future, I haven't used glow fuelstarting my4th season so it didn't occur to me that 30% heli is around $40 a gallon. My eye caught that price yesterday perusing a magazine

On a per flight basis, the new batteries will cost half that of a glow powered flight which uses 30% nitro...My gasoline set-ups cost about 1/6 the batteries' per flight cost (100 flight basis for a set of new Bats from F3AU). That's about 1/12 what glow costs per flight.....That's US dollars basis of course and not necessarily the same world wide.....