Chris Craft Commander Forum: Re: the whole story

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Re: the whole story May 9 2007 at 7:36 PM		Bill (Login billinstuart)
Response to the whole story

Pitch is pitch..on revolution of a 12" pitch prop moves the boat 12", whether it's a 10" diameter or a 40" diameter. diameter, # blades, blade area all affect slip and prop drag. I'd say you're not too far off with 15x17 if gear is about 2:1, but you may need a little more pitch. Some of those old CC props had alot of blade area...big ol' round looking blades. Lotsa drag. BTW..I'm redoing a 1971 31' Sport express that came with 427's. Engines are gone..gonna go back with 454's, recam/retune for a little slower operation, kinda a torquer motor. I like those new down angle trannys that don't require reverse rotation motors.

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Responses

Here are the weight and power factors on a 31' Commander - Paul on May 9, 2007

Okay,,,,,,,,,,,,,,,here we go with a 2.0:1 gear reduction tranny, compared to the 2.5:1 - Paul on May 9, 2007

1.54:1 - Mike Burdette on May 10, 2007

Build Sheet - Anonymous on May 10, 2007

Good clarification, Mike ( here is the data for 1.54:1 reduction ) - Paul on May 10, 2007

Speed of 32-mph is listed by Chris Craft - Paul on May 10, 2007

1970 Brochure - Mike Burdette on May 10, 2007

1969 Brochure ! - Paul on May 10, 2007

Did you notice the photo similarities? - Paul on May 10, 2007

Sharp eye! - Tom Slayton on May 10, 2007

RPM/HP - Bill on May 10, 2007

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