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Checking the North American model list confirms North American ESO-4028 / NA-241 is the Buckeye, winning submission to OS-141.


The ESO-7618 ("Jet T-28") is thus a direct contemporary of (and alternative to) the T2J Buckeye, a T-28 derivative for low cost and ease of development but probably partly non-compliant with the OS-141 specs.


If compared to Lockheed CL-330/CL-340 proposals, it would seem to fit a general pattern of probably non-compliant derivatives of existing designs (CL-330 derivative of T2V, ESO-7618 derivative of T-28, Temco Model 59 Pinto derivative) and fully compliant but largely new designs (e.g. CL-340, ESO-4028).


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