25 seafari questions

[Fr. Frank]

I just looked at the BUC website and the 2003 2509 WA Trophy OB model is listed as 4400 lbs net weight. The net weight of a boat is based upon buoyancy, and is the weight of the hull, plus power, fuel, persons & gear. It is also called displacement.

For example, my 20' Seafari has a listed hull weight of 1800 lbs. My motor weighs 375 lbs, I carry 28 gallons fuel, and I have a max capacity of 9 persons, or 1455 lbs persons and gear. If we go with the max of 1455, the equation looks like this:
Hull - 1800 lbs
Fuel - 168 lbs
Motor - 375 lbs
Persons/gear- 1455 lbs
Net Weight or Displacement - 3798 lbs

For your 25' Seafari: Hull - 3000 lbs, 105 g. Fuel - 630 lbs, 7.4 L sterndrive(1982 weight w/ TRS) - 1244 lbs, Max capacity persons & gear - 1619 lbs = 6493 lbs net weight.

So an "apples to apples" comparison using your examples is:
2509 Bayliner Trophy = 4400 lbs net weight or displacement
25' SeaCraft Seafari = 6493 lbs net weight or displacement

[Ryank]

We salvaged and scrapped a 25 fly bridge that weighed 2800 w/out engine or fuel, it took the D6 dozer approx 20 seconds to make it look like a flat pancake that couldn't have weighed more then 500lbs lol. It was amazing to watch.

[seafari25]

I just looked at the BUC website and the 2003 2509 WA Trophy OB model is listed as 4400 lbs net weight. The net weight of a boat is based upon buoyancy, and is the weight of the hull, plus power, fuel, persons & gear. It is also called displacement.

For example, my 20' Seafari has a listed hull weight of 1800 lbs. My motor weighs 375 lbs, I carry 28 gallons fuel, and I have a max capacity of 9 persons, or 1455 lbs persons and gear. If we go with the max of 1455, the equation looks like this:
Hull - 1800 lbs
Fuel - 168 lbs
Motor - 375 lbs
Persons/gear- 1455 lbs
Net Weight or Displacement - 3798 lbs

For your 25' Seafari: Hull - 3000 lbs, 105 g. Fuel - 630 lbs, 7.4 L sterndrive(1982 weight w/ TRS) - 1244 lbs, Max capacity persons & gear - 1619 lbs = 6493 lbs net weight.

So an "apples to apples" comparison using your examples is:
2509 Bayliner Trophy = 4400 lbs net weight or displacement
25' SeaCraft Seafari = 6493 lbs net weight or displacement

Fr. Frank

In no way am I opposing what you are saying. In fact, my signature should read "wisdom is learning from Fr. Frank" by now but this topic is of particular interest to me. Not just because we're talking about my favorite 25' boat but also because I'm in the scale business.

On the Railroad, we refer to net weight as the weight of product in a rail car not including the light weight. The 2 added toghther would equal the gross weight.

In my mind, displacement should be the gross weight.

Are the terms different on the water

Brandon

BTW Nuthinfancy I`ve never had the opportunity to check the dry weight of ours but I think Fr. Frank`s right on at around 6 to 7000 lbs displacement according to the guy that stores our boat for the winter (although he hasn`t actually weighed it). I guess he just has an idea compared to other boats he stores.

[stumpie2]

I TOTALLY RESPECT FR. FRANKS INSIGHT BUT I WISH THERE WAS SOMETHING TO COMPARE APPLES AND APPLES TO.. SUCH AS ANOTHER 25' SC TO COMPARE TO OR A BOAT OF SIMILIAR DESIGN. IE SEABIRD, ANACAPRI, ALBE... O I FORGOT THERES NUTHIN LIKE A SEACRAFT... BECAUSE IM TRYING TO AVIOD WEIGHT ISSUES AND REALLY DONT WANT TWINS= NEED MORE FUEL AND MAINT. AND THE BIG 4 STROKES ARE SO LAZY AND HEAVY

[eggsuckindog]

Sounds light to me also, I thought my 23 Sceptre was 3540 dry. Check a newer 25 CC and see what it lists at ??

[stumpie2]

THE NEW SEACRAFT 23 CC HULL IS APPROX. 4200 LBS AND THE 26 CC HULL IS APPROX IS 4600 LBS. I THINK THEY WEIGHED THESE THINGS DIFFRENT BACK IN THE DAY... MAYBE NO LINER OR CAP JUST THE EMPTY HULL...

[Fr. Frank]

In my mind, displacement should be the gross weight.
Are the terms different on the water
Brandon

I don't know how anything else is weighed. The USCG lists the net weight of a vessel as the weight of the volume of water the vessel displaces as loaded. It is mathematically the same as the vessel's displacement. But as water density can vary, the net weight can change, whereas the calculated displacement remains the same. Displacement is always calculated against fresh water at 59* Fahrenheit. (I don't know why it's calculated that way, but it's the same temperature used as a base when calculating "density altitude" in flying.

At any rate, the net weight of a vessel is the weight of the volume of water it displaces at current loading at rest in current waters. Manufacturers who use net weight for statistical purposes assume maximum loading in fresh water at 59*.

Just make things confusing, the volume of water displaced must actually weigh LESS than the actual weight of the vessel. The difference in weight is called "buoyancy"

Manufacturers generally calculate a vessel's "dry weight". This is the weight of the hull and structural fixtures when dry. It does NOT include the weight of a power-plant, fuel, cushions, seats (unless molded as part of the liner or cap), etcetera, or any optional equipment.

[eggsuckindog]

If that was a 23T which I think it is - they are really 25, the cheater boats for the Kingfish guys like a Contender 23T

[cdavisdb]

Found a 1965 Formula catalog that showed the 233 at 4200 lb. That was the original mold and they put a whole lot of glass in it. I have seen other quotes at 4100 lb for later years. That is dry with engine. My old Seabird 24 was 3900 lb with a 350 outdrive. Subtract the engine and around 3000 lb seems reasonable for those boats. The 25 has more weight up high than the Seabird and is 1.4 ft longer. My 25 seems more solid than the Seabird and some heavier overall, but that's just my impression, have not weighed it. Still, 3000 doesn't seem too far off.

Connor

[seafari25]

I don't know how anything else is weighed. The USCG lists the net weight of a vessel as the weight of the volume of water the vessel displaces as loaded. It is mathematically the same as the vessel's displacement. But as water density can vary, the net weight can change, whereas the calculated displacement remains the same. Displacement is always calculated against fresh water at 59* Fahrenheit. (I don't know why it's calculated that way, but it's the same temperature used as a base when calculating "density altitude" in flying.

That makes sense to me, it was just the word net being used for an entire weight that conused me. I`ve read that the same boat will float higher in salt water than in fresh. That`s interesting...I`d like to test that theory one day.


I`m in agreement with the recomendations of Dave and Connor but I`m pretty sure nuthinfancy is set on a bracket and outboard. I believe it can be done if done right. Hopefully Strick will chime in as he`s really done his homework on this topic.