Isn't eccentric just being mad but with enough class or money for it to cause wide spread harm or entertainment.
From the
OED.
Eccentric: Sense 6
b. Of persons and personal attributes: Deviating from usual methods, odd, whimsical.
1685 in N. Thompson
Coll. Loyal Poems 6 The Brightest, yet the Most Excentrick Soul.
1695 Ld. Preston tr. Boethius
Of Consol. Philos. ii. 68 The Extravagance of Excentrick and irregular Desires.
1771 H. Mackenzie
Man of Feeling (1803) xxxiv. 61 His motives were rather excentric.
1801 R. L. Edgeworth in M. Edgeworth
Moral Tales I. Pref. p. viii ‘Forester’ is the picture of an eccentric character.
1836 H. Rogers
Life J. Howe (1863) ii. 19 That great, though unequal and eccentric genius.
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I think our pumpkin sailing friend is a perfect example of "
deviating from usual methods, odd and whimsical".
Interesting early spelling, I never knew that.
Regards,
Jay.