Jumbo Jet's were a production model, often portable.
The 2 Whizzers wer more of a custom installation, expanded and spread out over the terrain.
"Jumbo Jet" is not a type of coaster - it is a layout. Jumbo Jets can also be called Jet Star IIIs. Whizzer (a "Speed Racer") has a much more spread out layout. Infact some people refer to Speed Racers as "Extended Jumbo Jets" (despite the fact that the first Speed Racer opened one year prior to the first Jumbo Jet).
Here is a great link: http://schwarzkopf.coaster.net/
edit: Darn! Beat me to it!
The Other Siebert
*** This post was edited by Canadas Coaster Drew on 9/14/2002. ***
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