ORIGINAL: eccvets
bench testing with realflight
So tonight I figured out how to enter a few specs in to realflight G4 and what I found was fairly intresting as when I plug in the stock settings on to a bobcat which mimics this plane in weight, power, battery, dimentions, engine, prop size, and everything else I can think of... It doesn't fly or take off like the real thing... Now I know that realflight isnt exactly real but it should give a fairly accurate theoritical about how a plane should fly given all the specs and its quite intersting to see that a simulated model of this plane in a perfect world would not fly with the stock settings... Only when I swap out the prop to a 7X6E or put in a 3S 1500mah lipo with a 2200 brushless motor on the stock prop will it actually get off the ground and even then its fairly sloppy and behind all this you gotta remember this is what would be if in a perfect world with 0 wind and other perfect conditions where everything is working just right. I gotta really wonder if this plane will ever really get off the ground on its own and fly around...
To begin with a Bobcat is a bad analog of this plane.
Using it as a starting point will produce unrealistic results because of this.
It IS possible to adjust the model to mimic your plane, but there are MANY MANY nuances to doing so that you MUST understand.
Simply plugging in figures ( as most newbies seem to think suffices ) is not enough.
The physics scaling parameters effectively give you a smaller sized model of the larger plane, but not necessarily with a smaller model's characteristics.
To get the performance of a real smaller model you really need the physics at 100% scale ( not a reduce scale ) and then you need to adjust the weights, dimensions, mass, wing characteristics, etc. to the smaller model. This is NOT trivial.
In effect from the physics side you are starting from scatch.