I recently bought a 1971 31' commander sport without a trailer and need help finding hull dimensions and trailer running board placement measurements.

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Gerry, this isn't a direct answer to your question, but when I bought a trailer for my 27 I had the boat lifted and placed on the trailer so that we could adjust the bunks so the boat would fit correctly. 

Doesn't the 31 Sport have a fly bridge? Will that fit on the road?

What trailer are you looking at?

My serial # starts with FXA. I found  its not a sport. I am a welder / fabricator, and have a dual axle trailer that I want to customize to fit my boat. The marina where it is doesn't have a lift. It's a 3-1/2hr drive from my home. Please excuse my Boating grammar, but I'm starting out with this boat. I would like to know where to find the blueprints for this boat. I've taken countless avenues online with no results. 



Jim Frens said:

Gerry, this isn't a direct answer to your question, but when I bought a trailer for my 27 I had the boat lifted and placed on the trailer so that we could adjust the bunks so the boat would fit correctly. 

Doesn't the 31 Sport have a fly bridge? Will that fit on the road?

What trailer are you looking at?

Hi Gerry,

Marininer's Museum might have what you are looking for.  You will need to provide the hull number (the one that starts with FXA) 

  • Mariner's Museum Library at Christopher Newport University in Newport News Virginia contains the largest collection of marine artifacts in the Western Hemisphere.  The Chris Craft Corporation entrusted the records for YOUR boat to "The Mariners". http://www.marinersmuseum.org/library/#chris-craft 

Chris-Craft Archives
(757) 591-7785
chriscraft@MarinersMuseum.org

A search on this website found a few discussions:

https://commanderclub.com/forum/topics/31-commander-trailer

https://commanderclub.com/forum/topics/trailer-for-a-31-commander-1



Gerry J. McDaniel said:

My serial # starts with FXA. I found  its not a sport. I am a welder / fabricator, and have a dual axle trailer that I want to customize to fit my boat. The marina where it is doesn't have a lift. It's a 3-1/2hr drive from my home. Please excuse my Boating grammar, but I'm starting out with this boat. I would like to know where to find the blueprints for this boat. I've taken countless avenues online with no results. 



Jim Frens said:

Gerry, this isn't a direct answer to your question, but when I bought a trailer for my 27 I had the boat lifted and placed on the trailer so that we could adjust the bunks so the boat would fit correctly. 

Doesn't the 31 Sport have a fly bridge? Will that fit on the road?

What trailer are you looking at?

Hi Gerry, I measured my friend's '69 Sports Express 31' to decide if I can use a hoist available this summer for my '74 31' Sports Cruiser.  Rough measurements, but maybe they will help, should be the same hull as yours.

I started at the stern as my zero, made measurements from the ground using the tip of the keel at the stern as zero vertically.  The prop shafts go into the hull just under 48" forward from the stern.  This boat has twin 327s, not sure the prop size on it or mine.

I'm looking for a trailer for hauling our boats in and out, next project.  My boat has been sitting in a building in Sturgeon Bay for a decade, my friend's boat is here in Holland Michigan, if you are close to either you can get some measurements.

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More pics, probably too big for this forum

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Another...

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If I have the same hull, your diagram & pics are exactly what I need !! so are the prop's bottom measurement The "draft" ? and always lower than the rudders ? i'm in south louisiana. app 10 mile ride to the gulf.

Scott Miller said:

Another...

Usually the props are the lowest point, and 'draft' is the distance from there to the water surface. I say 'usually' because on my boat, which I suspect some prior owner replaced the original rudder with a larger one, the rudder is several inches below the prop (single motor). 

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