Hi Andreas;
The AXI 28-26-10 might be at the limit for this model. ~^The Legacy has an area of about 688 sq. in. I do not know whether that figure is including
flap area, and if it isn't, that brings the area up higher. It is a fairly large airplane, with large surfaces.
It is designed for IC 40 -60 size power. Most guys would tend toward 60 size in wet power. (unless piped) If I were flying this bird in 4-stroke, I would
not hesitate to mount a Saito 62. (which weighs about 15 ounces)
That being said, the AXI 28-26-10 is on the lower power spectrum in electric for this bird. I am unfamiliar with the motor you referenced.
It might work. I would like to see a motor that would comfortably put out 700 to 800 watts for this airframe. I would want a reasonable amount of reserve power. You don't have to use it, but it's nice to have in case you need it, for the small weight penalty incurred in going to a slightly larger motor. If you go too small, the motor will be at it's max or beyond, and not too happy.
Although AXI advertises you can use 5 cell LiPo's , not many in electric have used that motor in that configuration. It is usually used in 4 cell configuration, which means to get the wattage up there you need to use some serious amperage.
Might work, then again, for an additional 3 ounces, with much more power range, why not consider something like:
Hacker A40-10S (750 kv , 900 watts, 9 ounces weight) or its brother the
Hacker A4012S ( 610 kv, 900 watts, same weight)
You can see them on line @ Espritmodel.com
You can go 4 or 5 cell without penalty, ( if 5 cell, lower kv, 4 cell larger kv )they will swing whatever prop you throw at them, for this airplane, and they have ball bearings on both sides of the shaft for longevity, have internal cooling fans, and are very efficient without being too expensive. I tend toward higher
voltage,( 5 cell) , lower amperage to get the same wattage. Higher amperage can generate more heat.
I've used Hacker's in my twin electric fantasy bomber (A30's) and they performed very well.
Any questions, fire back.
Will Moore