fantastic plastic

Wow,

that's alot of Mahogany..... it will take a while, until it's glued on the frames.

Lothar

Well Hasse,

it's simple Mathematic.

If we build in scale 1:5, the Modell is 5 x shorter as the real boat. The sail areas are 5x5 (square) =25x smaller as the real sails.The volume or displacement is 5x5x5 (cube) =125x maller as the real Displacement. In other scales for ixample 7,5 the factors are 7,5x7,5=56,25 for square and 7,5x7,5c7,5=421,85 for cube. As You see, only by changing from scale 5 to scale 7,5 the factorsare rising a lot. That's the reason I build 1:5.

For example: Ester has a displacement of about 3,8 tons, the modell weight is 3800 kg divided through 421,85 = ca. 9kg.

If Bonita has 2290 kg, it should be 18,3 kg. The factor is 125...

In the keel should be 10,4 kg.

These calculations are the pure theory.

On the picture of Ester I can see 6 sailors. Those guys had about 70-80 kg so we can add at least 450 kg. And I am sure, the ad also some more clothes on board and a peace of bread and butter or Rum

So I would prefer to calculate with about 4,3 tons. Than the model can have about 10 kg. Another Kilo in the Keel or a bit of tolerance for the whole boat.

At Bonita I would add 2-3 Persons, some different foresails and a little bit for Oilskin. So You can add about 200 kg. This are another 1,5 kg... You see, there is enaugh tolerance.

By the way, the scale dilemma:

As You can see at the factors, the sail area is factor 25 smaller than at Bonita 1:1, the weigt is factor 125 smaller! That means in relation to Bonita 1:1 the sails are factor 5 larger in the model.

Well, the wind is much slower in 2m than in 10 meters above the water. You will not sail the model at more than 4-5 beaufort, most areas where You sail a model are a bit protected by trees and so on. So I am sure, it's possible to sail Bonita 1:5.

But You also see at my little calculations, that Ester has the factor 7,5.. that doesn't make it much better.....

And if You think about J-class Svea in 1:20, forget it without special keel at a windy day.....

That's the reason, I build small boats at a small scale. This makes it more realistic and opens a better range of wind for sailing the models

Some questions?

Regards

Lothar

Yepp,

and this shouldn't be a problem to do that. But.... I would build a hollow keel between the hull and the Ballast, that You can add lead to the keel, if the boat is not heavy enaugh or need more Ballast. When the hull is from the bulding board, we have some more to talk Theory

Regards to Sweden

Lothar