Rotary's are a crank with a side housing / rotor housing / side housing / rotor housing....think of assembly like a stack of donuts. If you have a longer crank with more journals, you just keep stacking. Here is a 6 rotor for an airplane....
The number of moving parts is reduced by like 75% and there are no reciprocating parts either, thats why they run so smooth.
Just google 20b rotary, start following links, you'll be impressed. I have been sold on these things since I was a kid back in the 80s. They're remarkable all the way around. Anyone your hear repeating bad information about them simply doesn't know what they're talking about. They drink lots of gas and are not very EPA friendly, they destroy exhaust systems from the heat, but that being the case, I LOVE them. A spider with a hot rotary would be a weapon on the street. The 914 I did was an animal and they fit great, they are small as hell.
Check this out :
Their first rotary car, the Cosmo Sport 110S, was introduced in 1965 and went into very limited production in 1967. These cars were basically hand built and only about 1200 were made in their production run between 1967 and 1971. They are extremely rare and highly coveted by collectors today, with only six known in to be in our country
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