----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- Hi James,
Seems they don't understand that the Ercoupe ( all Ercoupe versions) are full three axis control aircraft. Most are two control, with the rudder interconnected, and some were available with independent rudder pedals (originally a $25.00 factory option).The limited elevator travel prevents the aircraft from ataining a pitch attitude, angle of attack - that results in a stall - thus without stalling, it cannot spin. Mr. Weick specifically designed the aircraft this way to prevent take off and approach to landing stalls/spins, and the resulting injuries to pilots and aircraft. The aelirons are rigged differentially so that there is less drag produced in a turn, and the rudders interconnected so that all turns are fully co-ordinated. The engine is mounted 5 degrees to the right so the thrust line offsets the prop torque "P" factor that tends to turn airplanes to the left and upwards. ( Modern airplanes mount the vertical stabilizer offset to compensate). The engine is also mounted at 3.5 degrees down thrust to overcome upward pitching moments when the throttle is opened from a glide...( as in a go around). The Ercoupe does not pitch up with throttle application, as does a C- 152/172, etc. which makes trim adjustment immediately necessary to relieve control pressures. (Glide and power on trim is the same). There is no STC I am aware of that allows a Ercoupe to be a two axis control airplane, as many ultralights are. As mentioned above all Ercoupes are full three axis control airplanes..only the two control Ercoupes have interconnected controls that fully co-ordinate the three axis of turning. Ultralights utilize excess dihedrial of the wings to compensate for the differential drag caused by turning, thus realizing a satisfactory two axis control turn. Whe Mooney purchased the Ercoupe, and installed the single tail, they also added stall strips to the wings, and increased the elevator travel so they could stall; but they never certified the aircraft in spins.... No Ercoupe version is certified for inverted flight... Hope this helps clear up the difference between two control co-ordinated flight and two axis control ( Aeliron and elevator only/ or rudder and elevator only). The wright Brothers recognized that Yaw resulted from the difference in drag/lift resulting in the turning of a wing, and installed rudders - and a wing warping system (predecessor to the aelirons developed by Curtis) to compensate for the Yaw.. This was the single most important issue that resulted in their succesful controlled flight. Fred Weick's Differential Aeliron Control allowes a more efficient control of yaw with less rudder input. Fly Safe - Have Fun REgards Harry Francis Blacksburg, VA. ==^================================================================ EASY UNSUBSCRIBE click here: http://topica.com/u/?aVxiLm.aVzvvT Or send an email To: [EMAIL PROTECTED] This email was sent to: [EMAIL PROTECTED] T O P I C A -- Register now to manage your mail! http://www.topica.com/partner/tag02/register ==^================================================================
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