The Magic Extra 40% at 28lbs, was undoubtedly the model in the vertical drag race.

Many 35% models weigh in at 30lbs or more.

The drag curve on the 40% model is not likely linear, therefore even though the model is larger it does not represent a huge drag coefficient increase as compared to the 35% model.

Why is it so hard to imagine the 40% model with a weight savings of around 21% comparatively producing a claimed 30% less hp may not do the job?

Or how about the power to weight ratio; lets see 28lbs/10hp=2.8 or 40/16.5=2.42 seems the lil guy has a slight disadvantage to me, ever so slight.

And lastly how much did those 40% racers weigh in at? I'm betting they were porkers. New/old version engines, tired engines, properly tuned? Oh yeah, lets put some wood on those 150's too! Mejlik props don't get it my book. I suspect the 150's with the right prop (Menz S) with reasonable weighted models would provide a good race, if not win typically especially on the long lines...


Got to thinking and ran some prop thrust disc area comparisons. Yeah, I know those darn programs are not all that, BUT. The numbers suggest something equivalent to the power to weight ratio numbers. Static thrust to weight of the 40% is 2.65 verses 2.5 for the 35% model. Of course the rpm numbers I used may have been off; I used 6000rpm on either combo.