Bob Urban wrote: Is my memory failing me or don't you have to change\drill orifice size in the main gear too when going from "C" to "D" model.
I don't think so. I find no referenc to it in the Information Letter quoted below: According to Ercoupe Information Letter #1: Subject: Conversion of Ercoupes to Later Models, dated Jan 1, 1956: "The Model 415-D Ercoupe was developed under F.A.A. regulation Part No. 03, and permitted the gross weight of 1400 pounds on the Ercoupe under these regulations. In order to obtain satisfactory stability conditions with power on, it was necessary to limit the up elevator travel to 9 degrees. In the opinion of the factory, this limitation seriously affected landing qualities of the Ercoupe. For this reason, the 415-CD was produed instread. The 415-CD had all the modifications other than the elevator travel necessary for the 415-D, but was licensed under the 03 catagory, which still restriceted it to 1260 pounds. "In order to convert a Model 415-CD to a Model D, it is necessary to limit the up elevator to 9 degrees, add placards to the instrument panel prohibiting smoking and prohibiting aerobatics, and require that the airplane be flown in accordance with limitations in the Approved Flight Manual. It is necessary to supply the suitable flight manual as well. "A Model 415-CD can be converted to a Model E and achieve the 1400 pounds gross weight, and at the same time, improve the landing qualities instead of destroying them by the use of the cut-out or "split" elevator. With this elevator satisfactory stability is retained and the landing characteristics improved with the up travel of 20 degrees with the reduced area elevator. The Model E has an 85-h.p. enging and it, therefore, is necessary to convert the engine to this power, changing or modifying the propeller as necessary for the higher power. The other modifiactions given above, and including the Model E Flight Manual, are required for this conversion. "The changes necessary to convert the Model 415-C to Model 415-D or a Model E depend upon the serial number of the airplane, however, in all cases it is necessary to install the stainless steel skin over the fuselage gas tank and to make the other changes indicated for the Model 415-CD. The instrument panel should be changed to the late type and it is desirable to modernize the airplane in other respects but these items are not required by the F.A.A. for the increased gross weight." Syd Cohen NC94196
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