The whole horsepower thing is kindof a misstated voodoo mumbo jumbo too.

The proof is in the pudding so to speak, and that means what prop will it spin at how much RPM's.

Are there any user reports on props and rpms for the 58 that we can make reliable "field observations" from?

Again, the 7000 rpms on a 22x12 does not sound so much more powerful than the DA50's I see spinning 22x8's at 7500 and 23x8's at roughly 7100 or so.

RC Showcase states the ZDZ 60 spinning a 22x10 at 7300... seems like this is what you should expect from a 60cc class engine.

Until someone shows me an EVO/MVVS 58 spinning something like a 26x8 prop, I don't respect it as an "80 class powerhouse" nor do I suspect it would come close in spinning it the same.

My point?

To determine the "ideal" engine you must consider wingloading first THEN power to weight ratio.

An Evolution 58 may be somewhat more powerful than a DA50... but weighs 1.75 lbs more. If a DA50 already is "gobs of power" for a 16.5 lb aircraft, then adding 1.5 lbs of weight is senseless and will detract fromt he flying charateristics for the plane even if it is powered more.

Conversely, if an 80cc aircraft is powerefully powered with an 80cc engine (a good match), then putting a 58 in it will lighten it a little but drastically drop the power to weight ratio.

Each plane is a case by case situation... but suffice it to say that there aren't any real 60cc airframes out there that aren't simply heavy 50cc airframes.

Just my opinion you know...