ORIGINAL: jsallade
Actually that 12.5 x 13 prop is about 85% of the minimum load recommended for this engine.... So with good lubrication and ventilation... I'm betting on a midair or other ''unfortunate end'' to that airplane before the engine gives it up! Just a prediction. An 18x6 is about the equivalent in the other direction (overload/above spec)... wonder if that would cause a failure first under full throttle conditions or the smaller prop would??
Of course, I did say with adequate ventilation and lubrication... we don't know if that is happening or not!
Actually that 12.5 x 14 is
BELOW what DLE recommends for the DLE20 (14 x 10), which will put it in excess of 10,000+ rpm's, and often!
An 18 x 6 is
ABOVE (17 x 6) what's recommended. So I'd vote on the smaller prop &/or a mid-air as being the demise of that model.
As for lubrication, he'd do good to increase it to say 25:1.....but if he's using Lawncrap all bets are on eng seizure
My good side says everything about that setup & style of flying is wrong.
My bad side though says they're having loads of fun and a mid-air would just be awesome!
If ya clicked on his user name to bring up his profile, then scan his other messages, you'd find he's posted other videos with the same chaotic flying.
They're always having a good time!