Hi!
I have almost finished my Tucano, but mine comes out way heavier than the manual says. The manual says 4200 kilogram, but my is 6000kilogram (ready to take off) A great deal of accsessories on this one[&:]
I have a OS 108 two stroke engine behotec retracts and glassed wings(light).
the wing loading should be 97grams/dm2 but mine is 139 grams/dm2(46,33 oz/in)
I have calculated the stall speed to be 25 MPH, but this is pretty rough measured.

Any thoughts?
Will i be able to land this plane under supersonic speed?
is it any hope?