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I'd very be interested to hear the experts comment on the power off & power on stall & potential spin charactoristics of a C/D converted to a D with an O-200 at gross weight of 1400 lbs, with13 degrees up elevator. Has anyone done any testing, or tried this first hand?? The best glide speed at gross in my 415 D seems to be about 80 MPH. Anything below 75 MPH increases the sink rate drammatically with power off. Dan DO NOT ACHIVE ----- Original Message ----- From: "William R. Bayne" <[EMAIL PROTECTED]> To: "COUPERS-FLYIN" <[email protected]> Sent: Wednesday, November 24, 2004 9:46 PM Subject: Re: [COUPERS-FLYIN] glide and stalls ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- Hi Tim, Ercoupe Service Memorandum 59A is clear as mud on this subject. When rudder pedals are installed in a 415-C or CD (with the full 13º up elevator available), oblong placard 415-51077 or round plastic plate 415-51143 (each originally stating "THIS AIRPLANE CHARACTERISTICALLY INCAPABLE OF SPINNING") are changed to read "INTENTIONAL SPINS PROHIBITED". This says to me that under certain circumstances these rudder-pedal coupes can spin! It goes on to say that "Models D, E and G do not require any additional placards for they have one stating, "THIS AIRPLANE CHARACTERISTICALLY INCAPABLE OF SPINNING--NO ACROBATIC MANEUVERS ARE APPROVED--THIS AIRPLANE MUST BE OPERATED IN COMPLIANCE WITH THE APPROVED OPERATING LIMITATIONS." You are unlikely to make a 415-D stall at 1400 lbs. with only 9º up elevator available. That can NOT be said for the 'E' and 'G', so I fail to see why the same change in wording was not considered appropriate. What follows is not nearly as brief and clear. The Approved Airplane Flight Manual for the 'E' and 'G' Models says, p. 6, "Low Speed Warning Cushion: A signal is provided to let the pilot know when he is in the region of low speeds below that required in ordinary flight. When he is starting an approach to a landing, as he reduces the airspeed by gradually pulling back on the control wheel, he feels a cushion resisting further rearward travel at about 60 mph. At this point there is sufficient speed margin above minimum speed to enable him to flare off the glide path for a smooth landing under average conditions. The control wheel should not be pulled back through this cushion of additional force until the airplane is within a few feet from the ground and ready for the final leveling out of the glide path for gentle contact." Ercoupe Service Memorandum 35A states that "Power off minimum airspeed is 60 MPH", while the above infers that "minimum speed" is reached AFTER pulling the control wheel fully through the "low speed warning cushion". So it appears there exists the "in-flight" minimum speed of 60 mph, and some "Landing" (ONLY) minimum speed (unspecified, but probably 45-50 mph) with the control wheel all the way back through the warning cushion. With or without rudder pedals, the factory did not sanction the use of the additional elevator authority of the split elevator for in-flight stalls! Anyone (mis) using this additional elevator authority to intentionally stall (or whip-stall) and cross-control successfully into a spin immediately becomes an unauthorized and unpaid test pilot of questionable intelligence. Our small rudders are of reduced effectiveness by design. When one rudder moves out 22º and the other moves in only 3º, rudder movement is only 57% effective (as compared to having 22º movement available both ways)! The SeaCoupe testing Edo floats needed additional elevator (to get floats off the water) and rudder movement (water rudders). This made it spinnable, so the CAA insisted it be spin tested. The aircraft was destroyed after entering an uncontrollable spin. Regards, William R. Bayne <____|-(o)-|____> (Copyright 2004) -- On Nov 24, 2004, at 8:28 PM, Tim and Martha Briggs wrote: > > Ercoupers: > > (I have rudder pedals)-...I have yet try stalling my Ercoupe while > banked and skidding or slipping. > Exploring that region of the flight envelope just doesn't appeal to > me. Maybe sometime with a > seasoned CFI or aerobatics pilot. > > Is there any info out there on how the Coupe behaves in a banked, > uncoordinated stall?? > > Thanks > > Tim > > Ercoupe 415G > N94413 ========================================================================== == == To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers/ ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers/
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