Chris

In short, yes. You missed Marketing. To impress glow fliers electric motor builders have done this to attract in new folks to electric who do not yet understand the ways of measuring a motor's power. Then they label the motor with a much smaller glow equivalent than the motor actually is. The result is a guy puts it together and goes and flies and it knocks the socks off what they say the equivalent glow powered plane would be. Yes, you are seeing setups that are labeled as .25 flow equivalents fly legacys. There is the proof. That size motors as you will see in the setup thread will fly any size glow plane we fly if used in the right kv version and with the right batteries and props. I fly an SV-11 with an Axi 2826/12 on 4S. At a contest last year in big wind one I overheard one of the judges discussing my flight with another pilot. The judge also flies an SV with a piped PA.65. He was telling the other flier he was just "in awe" of the power I had with the electric. The tone of his voice was total shock.

bob branch

What I am finding is that if an electric motor will swing the same size prop at the same or more RPMs as a slimer it is equivlent. Assuming the prop is the correct size and I am running the correct voltage and amps for a given motor.

Next winter's project will be to rebuild my 80" Eindecker (control-line scale). While I am at it I will convert it to an electric.  Originally I had planned to install a Saito 150 4C.  The Saito will turn a 16 x 8 prop at 9000 rpm.  So I am looking for an electric that will do the same.  The Trungy RotoMax 1.2 will swing a 19 x 10 at 8000 rpm.  I am guessing it will do the job.   Should have plenty of power for high flight and cruze comfortably at 1/2 throttle.

http://www.hobbyking.com/hobbycity/store/__17984___Turnigy_RotoMax_1_20_Brushless_Outrunner_Motor.html

Also remember not all slimers are the same.  A good OS .25 puts out the same or more as a Fox .35

  

Chris

In short, yes. You missed Marketing. To impress glow fliers electric motor builders have done this to attract in new folks to electric who do not yet understand the ways of measuring a motor's power.

I'm not sure if it's deceptive marketing or CYA: I always figured that if the motor says "25" on it then it matches the wildest super-duper ducted fan racing run-on-50%-nitro 25 that you could ever make -- so that when "joe racer" converts to electric, he's not disappointed.

For most glow flyers, if they convert to electric and end up underpowered then they're going to be discouraged and they're not going to want to try again.  So the motor manufacturers are trying hard to make sure that they end up with a combination that can be put together with inexpert hands and still perform at least as well as slime power.

At one point during WW1 some of the rotary engines had quality problems resulting in cylinders departing from the engine in flight -- perhaps if the engine flings pieces, you could pass it off as a scale maneuver?