I wish I had not answered that post because it had nothing to do with the original post which was about stalls, not about spinning but the placard is "Characteristically incapable of spinning" not Characteristically incapable of stalling".
Kevin1 --- In [email protected], "Ed Burkhead" <e...@...> wrote: > > > Kevin wrote: > > Yes the Ercoupe has a limited elevator and therefor > > limited stall but it is more that it can't be cross controlled in > > that stall that makes it "characteristically" incapable of spinning. > > In fact note 2 in the TC list the following placards when the peddles > > are installed "This aircraft characteristically incapable of > > spinning," or "Intentional spins prohibited." > > > Kevin, > > Your thoughts are logical, but, I think I'll disagree with your statement > that the inability to be cross controlled in the stall is what makes the > Coupes "characteristically incapable of spinning." > > The fact that Note 2 of Aircraft Specification No. A-718 still permits the > placard saying "This aircraft characteristically incapable of spinning" > gives me one indication that the inability to spin is maintained. > > I think that even a two control Coupe can be forced to temporarily enter a > spin, i.e. with a hammer-head stall but the Coupe won't stay in the spin no > matter what you do with the controls. I think this is also true of > three-control Coupes. > > Flying a THREE-control Ercoupe, I did stall testing with the controls FULLY > CROSSED. I found that, with the controls fully crossed, the Coupe still did > not enter a spin. This was true even with the more aggressive stalls at > higher and higher power (I had a straight elevator) pushing down the tail > via the slipstream. > > Yes, the ride got wild in the high power (C-85), fully cross controlled > stalls but it didn't drop off into a spin. > > On my highest power, fully cross controlled stall test, the left wing did > drop and the plane "fell" into a nearly level, slow left turn in an almost > level attitude. As I was already fully cross controlled, with full right > aileron and full left rudder, that was as bad as it could get. Slightly > relaxing the cross control on either the rudder or elevator let me stop the > slow left turn. > > Redusing the yoke back pressure, even slightly, also restored full > controllability. > > Admittedly, I chickened out after the full power minus about 100 rpm level > and did not do an absolutely full power, fully cross controlled stall. > (And, I was airsick by then.) Note, though, that with my extreme climb > prop, I think my 100 rpm below max behavior was similar to what most Coupes > would get with full power. > > Testing was done at high altitude, naturally. > > So, I *think* that the characteristic inability to spin is maintained even > in the three control Coupes. > > My testing is INSUFFICIENT to prove it for all Coupes. Records from the > extensive testing done during Ercoupe certification would be needed to make > that proof. > > So, it's just my humble opinion. And, even if I'm right about a properly > rigged and flown Ercoupe, due to rigging errors, an aft CG, or other > specifics of your plane, my observation may not apply to your plane. > > Ed >
