Wow, i feel like the nun smacking everyone on the hand with a ruler. Ya'll got in line very nicely. For the record I think that witches sink. thanks for the feedback but its obviously still a challenge to weigh a boat isn't it?

No if they float they are a Witch that's WHY YOU BURN THEM.

Agree, NIST for commercial use is 0.1%, 5 lb per 5,000 lb. I bought a 5,000 lb load cell to weigh multihulls on a crane for ratings. The load cell was certified again last year at Acme Scale / San Leandro. Fortunately, a local IRC measurer gave me a hint on what to ask for.

Acme Scale explained it to me. The commercial certification is to 0.1% with offsets or corrections at 1,000 lb (+2lb) 2000 lb (+1lb) ... 5,000 lb -3 lb.

An automobile (or small truck) scale is ~OK for larger multihulls ( > 24 feet).
10,000 * 0.001 = 10 ~ok
300,000*0.001 = 300 not ok

The ISAF ERS gives some guidance on weighing boats. The F18 fellows weigh more boats than most, hats off. The texel/schrs outputs are sensitive to the sailing weight inputs. Weighing a boat consumes time many sailors prefer to spend on the water.

Ooo..that's right. Witches do float. People sink...er...well - I guess that's why there was a little uncertainty in that test.

I'm a little surprised there isn't an app for this.


Also small rocks, and churches float.

I think they also used to weigh boats with hanging scales.
You put some straps under the hulls and hoist it up with a mainsheet.

Yes, that was the second option I was referring to (hang that thing from a winch/mainsheet block, attached to a swingset, being sure to tare/zero out the straps).

Mike

In 20 years we have only weighed once and that was nationals. The set up was two scales and a set of beach trac wheels. Pull your boat up on the trailer mast up and pull it on to the "tare" beach wheels. Up the ramp on to a pair of scales. They had one guy hold the boat and make sure it was balance and he called when to weigh. They added the weights. No one complained and those that had weighed before had very very close to the same numbers. They then put the boat back on the trailer and off you went. All in all a non issue. JMHO, YMMV, Ricardo.

For those of you at OSYC working on the O 20 Class development today and all other N 20 owners hoping to form a fresh approach to your Class and DPN Racing...

A NEMA 4 Enclosure rated at 2000 +/- 2% from Mc Master, part number 1820T11 will cost $1,264. 91 plus shipping. The load cell could be stored at Schurr Sails (three blocks from the hoist at Pensacola Yacht Club).

Set a minimal fee for the weight declaration and sail plan declarations to be certified with a formal O 20 measurement certificate (an ISAF future will be sooner yours).

Listen to Steve Green and include the Texel system in your research.

These scales can be rented for use by other Classes for measurement as well for their major USA Championships to cover costs down the road.

Charge for the measurement certificate (minimal) and incorporate modest Class dues in order to sustain Class growth and networking (web site etc). I just spent eight days with the Thistle Class, and they are going into their fourth generation of family sailing. Study the Class by - laws and constitution of the Thistle Class. You just might achieve ISAF Formula status sooner than you think.