hobbsy, yes 23 minutes but you have to know that most of that time was at or below half throttle. With my Webra to hover I was at 1/2 to 3/4 throttle to hover my S.E. with the T.S. 52 1/2 throttle will make it jump out of the hover like a rocket, believe me had I not seen them run and then ran one myself I would put this in the big fish story catagory too but it is true. I'm re-doing another of my S.E.'s and am trying to lighten it by a half pound, it will get the T.S. 46 and if I don't like it I'll buy another 52. The Webra is one of my favorite small engines so I'm not really knocking it but I will never spend 160.00 for a 50 size engine EVER again. I run both engines on 11.5x5 bolly's and 12x3.75x5 APC's and the T.S. outdoes the Webra on either prop, now I wouldn't put it up against the Webra on a pipe on a good high speed contest but for pure pulling power I would take the T.S. in a heart beat over the Webra, and my Webra would suck that 8oz tank dry in a 10 minute flight even at half throttle.