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1989 Renken SeaMaster 2688

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Astewart81

New member
Does anyone own this type boat? I have a duel gil bracket with twin 1994 Mercury Black Max 200hp motors. I am restoring the boat at this time. I cannot find the coast guard sticker anywhere on the boat. If someone has a picture of theirs they can send me I would be in debt to them! I have restored 4 other boats and this has been one of the most solid hulls I have seen!
 
Don't want you to think you are being ignored here - just assume no one has an answer for you.

I have looked through every source I can think of and can't find data on that particular boat.

I will suggest the following however. Many of the larger production boats (over 25 feet at the "short" end) are "yacht certified" which means there is NO coast guard sticker giving the max person capacity (which tops out at 14 persons if I'm remembering correctly and as a matter of policy, any boat greater than 20 feet in length does not require a capacity sticker (that's policy) however, many commerical builders do still include one on the 20-25 foot class). Otherwise a cruise liner would have a coast guard sticker (ok extreme but you get my meaning here).

I have a 26 foot mahogany cuddy (25'11" with 8'6" beam) that has a maximum displacement of 4700 lbs. The "rigged" hull, with motor, gas, water, all the junk etc tips the scales at about 2800 lbs. That leaves me a "max person capacity" of 1900 lbs.

The coast guard calls "a person" 150 lbs, so my capacity would be 1900 divided by 150 or 12.6 persons (and you round up to 13 and I can't see how I would fit 13 on board with any sort of elbow room, much less "comfort").

So to my point (after all this babbling) - your model should have similar "displacement" (I would guess roughly 5000 lbs) - so if you weight the hull on a trailer you will have a pretty good starting point - unless you actually need the exact numbers because you are contemplating selling the boat once restored.

If you are looking for your "max horsepower" that is a simple (somewhat) calculation (and this is coast guard math, not mine :))

You multiply your length overall (25' 11" in my case which is 25.916) by your width at the transom (8' 3" or 8.25) = 25.916 x 8.25 = 213.8 (and round to closest whole number) - 214 (this is called a "factor")

Then multiply your factor by 2 = 214 X 2 = 428

Then subtract 90 = 428 - 90 = 338

Then raise the result to the nearest multiple of 5 = 338 raises to 340.

That's my "max horsepower" = 340

(confused??) :)
 
Thank you for responding. I assume with the mid to low grade building reputation of the Renken (I find the structure to be very solid) there are not many owners of this model. I did not know there was a mathematical equation for horsepower! This actually answers my main question. The motors are 5 years newer than the hull so I want to make sure they did not over power the boat. This was very helpful Thank you again!!
 
Their reputation may have been "low grade" but they were more of a "no frills" type of builder. The company was around for a little over 35 years before they went bankrupt. I see them more as another "bayliner" - just a plain "chev" in a "cadillac" market - will do the job if you don't mind less refined fit/finish.

And yes, the coast guard has a bunch of formulae for various things related to pleasure boats including horsepower, capacity, amount of floatation required etc.

If you do a search for "safety standards for backyard boatbuilders" (it's a US dept of transport/US coast guard publication in pdf format - free online) and take a look through it, it will give you all kinds of information that may be useful since you are doing a rebuild/restore.
 
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