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John said: John, You'll find that in NO case will a Coupe have "no hope of recovery." Heck, it isn't easy to get a Coupe INTO a spin at all - a hammerhead stall can do it but not much else will. Let's please agree that with the CG within limits and . . . a. the weight at 1400 lb. and the elevator limited to 9? the Coupe can't be HELD in a spin - it will automatically come out of the spin and you then recover from the unusual attitude. a. the weight at 1260 lb. and the elevator limited to 13? the Coupe can't be HELD in a spin - it will automatically come out of the spin and you then recover from the unusual attitude. So let's consider your hypothetical situation, with the airplane mis-rigged to (let us say) 15? of up travel and 1400 lb. gross weight. Even then, it will exit the stall/spin when the elevator up angle is reduced to 9?, let alone moving it to neutral or full forward (as is standard operating procedure in spin recovery). A spin is a condition in which one wing is stalled more than the other - hence autorotation or a spin. When the elevator up angle is reduced to certificated levels in a Coupe, the Coupe's stall reduces to the point the airplane is flying with effective ailerons. Per the information Bill Bayne has dig up, it seems there was flight-testing that showed the Coupes were still safe to fly with the elevator rigged to allow up angle of several degrees higher than was certificated. (Not that you'd catch me flying that way - I LIKE the Coupe's designed-in safety margins!) To the best of my knowledge, there is NO SUCH THING as a Coupe incapable of recovering from a spin. Do you have some evidence to the contrary? Ed Burkhead http://edburkhead.com/ ed -at- edburkheadQQQ.com (change -at- and remove the QQQ) I know you believe you understand what you think I said, but I am not sure if you realize that what you heard is not what I meant. (Jim, AKA Midnight Plowboy) -----Original Message----- From: Skyport Services [mailto:[EMAIL PROTECTED] Sent: Friday, March 04, 2005 10:56 AM To: Coupe-Tech Subject: RE: FW: WRB Re: [COUPERS-TECH] D and CD model history At 10:51 AM 3/4/2005, Wood, Percy wrote: >As I tried to explain in my review of "Stick and Rudder," the pedals are not >needed. Ah, Percy, isn't that circular logic? Agreed, if the plane can't spin then pedals are unnecessary. From www.ercoupe.org "Combined with a somewhat limited elevator up travel (on some models), a Coupe's tail can't be pushed down enough to stall or keep stalled the majority of the wing on any Coupe." Allow the up-elevator travel to exceed the safe limits and "all bets are off" just as they are over gross or aft CG. My point was simply that the CAA weenie had to develop some standard by which it could be ensured that the plane would in fact remain unstallable and unspinable. The penalty for an error is finding yourself in a spin with no hope of recovery. John Cooper Skyport Services PO Box 249 4996 Delaware Tnpk Rensselaerville, NY 12147 518 797-3064 ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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