Folkboat derivatives

Tranona said:
Not knocking it, but many derivatives became more deviations as they developed and lost some of the essential character of the original (composite rather than derivative) approved design. What prompted my comment was the lineage of the Sadler designs where you can easily see the connection to the contessa 26 and in part the 32, but when the next developments came in the Sadler 24 and 32 there was a clear break in the design philosophy.
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I agree. I was just teasing!
 
There is an exciting go-pro video on you-tube of a IF folkboat going like the clappers in a gale with full spinnaker flying. Don't know the url but a google search will find it. View forward from the cockpit. Pretty hairy with a bow wave like a destroyer-
 
What a lovely bit of video, and their kite looks near identical to mine; when the boom end of a cruiser ( albeit a low aspect ratio rig ) rather than dinghy starts dragging in the water one knows things are becoming serious - the usual flattening effect of a camera lens hides this.

Yet another disprover of the waterline length max speed theory.
 
Seajet said:
Yet another disprover of the waterline length max speed theory.
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But it is not a "theory". It is just a way of trying to quantify what happens. It is better to describe it as the point at which a significant increase in power is required to overcome the bow and stern wave. This can either be done by raising the boat above the bow wave - which is commonly known as planing or as in the case of the video having enough power to force the boat through the bow wave.

It is not disproving anything - rather the opposite by showing that if you can harness enough power you can go through the transition point that normally limits displacement speed.

The formula commonly used is only an approximation of the point linking it to a known dimension, waterline length in feet.
 
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