Friday, August 23, 2013

Blulife in shape for model olympics

Yesterday I took Blulife out for a sail, to check if everything works.
The modelympics are comming up: http://www.mzdtk-lj.si/olimpiada.htm

Me and my father are planning on taking part, there are three sailing events, marathon(who completes the most laps around a triangle in 3 hours is the winner), Matchrace(no defenders, just elimination) and a classic race(I hope it is counting for the national championships)
We will let out the Marathon as I have to do work for school.

Anyway the boat is going strong, dispite a mishap, in wich both(the fore and the aft) rudders were broken, now it is sailing with only the aft rudder.
The light wind enabeld me to set the rigg up. The sails still have a nice shape.
The optimal setup is a small amount of lee helm, wich requires corrections with the rudder, lifting the bow. This is somewhat controversial(aspecially for light air), but it was the fastest setup i found on the races last year, and two years ago when i designed this boat i liked a lee tendency.
The boat heels even in 3-5knots of wind, but it was designed for drifters, typically seen on ponds like koseze where the model olympics will take part



The vang is set very tight, to flatten the main, and sink the stern, the ce leads clr by some 16% so dispite the flat main the lee-helm remains.
This boat has a problem tho. When heeled the center line of the weted surface moves to the side, worsening the attack angle of the rudder and keel fin,thats why it doesn't perform upwind when the wind picks up.

the hull has a depession near the bow, to keep the half entrance angle very small, the prismatic coefficient of the boat is below .5, in an effort to reduce drag, in the drifters.
Here is a clip another one will come soon.



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