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Old 11 June 2013, 15:38   #11
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F 470

The newer F 470's have an 18" transom by design. Older ones had a 15" shaft. The newer ones are designed for use with a 20" shaft motor. The explanation I was given was it is designed with a shorter transom to keep the motor lower in the water and less likely to have the prop come out of the water and make noise during beach landing. To me at least that makes sense when you consider that these boats are designed for the military and not the rest of us inflatable addicts that enjoy using them in their after life.

-C
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Old 12 June 2013, 14:01   #12
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Thanks! Please do. What are we measuring here exactly anyway and why? Are wee assuring the transom height or transom to keel? I have speed tubes on mine so that has to be considered I have been told but not sure why?
My transom measures 15" in height on its centre line. It was ordered from the factory as a short shaft model.

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Old 12 June 2013, 14:13   #13
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My transom measures 15" in height on its centre line. It was ordered from the factory as a short shaft model.

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That is the same as my Avon CRRC 4.5 as well.

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Old 12 June 2013, 14:17   #14
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My transom measures 15" in height on its centre line. It was ordered from the factory as a short shaft model.
Its a royal pita to find anything larger than 25hp with a 15" shaft over here. Almost for sure a special order or a franken motor.
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Old 12 June 2013, 17:55   #15
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Its a royal pita to find anything larger than 25hp with a 15" shaft over here. Almost for sure a special order or a franken motor.
Mines a Mariner 50, no problems at all. I'm surprised buying new would be a problem, 2nd hand market is only going to be whats in popular use.
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Old 12 June 2013, 18:30   #16
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Mine measured 18.5" top to bottom centered. It's actually an FC470 and its a 2004 model. Thanks for the explanation.

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Originally Posted by cgoing View Post
The newer F 470's have an 18" transom by design. Older ones had a 15" shaft. The newer ones are designed for use with a 20" shaft motor. The explanation I was given was it is designed with a shorter transom to keep the motor lower in the water and less likely to have the prop come out of the water and make noise during beach landing. To me at least that makes sense when you consider that these boats are designed for the military and not the rest of us inflatable addicts that enjoy using them in their after life.

-C
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Old 12 June 2013, 18:33   #17
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It's from CA. I am in Gig Harbor from time to time so I'll let you know when I take the boat up there.

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Top of transom to bottom of keel on the outside. Right in the middle of the transom. Don't worry about the speed tubes they don't dictate the engine shaft length. It should end up measuring about 19.5" or so.

Where did you find a FC470 in the PNW? Never seen one her in person so if you ever get up to Puget Sound let me know and we can go for a spin.
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Old 19 June 2013, 14:57   #18
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Mines a Mariner 50, no problems at all. I'm surprised buying new would be a problem, 2nd hand market is only going to be whats in popular use.
There are very very few North American boat manufacturers making boats for >25hp engines in anything but a long shaft (20"). You can special order a short (15") shaft 30, 40 or 50hp but its resale value is pathetic since so few boats rated for these midsized engines are built for them. I don't know why just seems to be convention.

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Mine measured 18.5" top to bottom centered. It's actually an FC470 and its a 2004 model. Thanks for the explanation.
Lucky you, a 20" will be easy to find new or used.

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It's from CA. I am in Gig Harbor from time to time so I'll let you know when I take the boat up there.
Cool, I am maybe 20mins north near Southworth. Love to see the boat and happy to bring mine along for show and tell.
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Old 16 July 2013, 18:00   #19
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Its a royal pita to find anything larger than 25hp with a 15" shaft over here. Almost for sure a special order or a franken motor.
It sure is hard to find a short shaft in anything larger than 25 hp! I've been scanning Craigslist for a while now, and finally lucked out. Today I bought a 35 hp short shaft tiller in Tukwila for my FC470. I really wanted a 40 hp, but I was excited to find the proper shaft and control configuration in 35 hp.
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Old 16 July 2013, 18:28   #20
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It sure is hard to find a short shaft in anything larger than 25 hp! I've been scanning Craigslist for a while now, and finally lucked out. Today I bought a 35 hp short shaft tiller in Tukwila for my FC470. I really wanted a 40 hp, but I was excited to find the proper shaft and control configuration in 35 hp.
Good news, Curious to see her all rigged out. And I have few people with inflatables to buddy boat with.
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