Re: Micro Rudder (high aspect vs low aspect)
I made the one on the WHSB a kick-up
On the other hand, nowadays nobody fishes or works from catboats, but they still put up with those giant barndoors. It really transforms an old cat into a very pleasant boat, I think
On the other hand, nowadays nobody fishes or works from catboats, but they still put up with those giant barndoors. It really transforms an old cat into a very pleasant boat, I think
--- Inbolger@yahoogroups.com, Bob Johnson <dredbob@...> wrote:
>
>
> There are some disadvantages to high aspect foils (rudders and
> center/dagger boards). First, there is the deeper draft, and secondly,
> they stall out (lose lift) at a higher speed than do lower aspect
> boards. This helps to explain why many traditional shoal draft types,
> such as the Cape Cod Cats and Chesapeake Skipjacks, for instance, kept
> their long, shallow, centerboards and barn door rudders. While these
> appendages have a bit more drag and are not as "efficient" as a deep
> high aspect foil, they maintain their lift (that is, continue to resist
> leeway) at low speed and are very powerful, a necessary trait for
> hauling dredges and nets.
>
> Bob
>
There are some disadvantages to high aspect foils (rudders and
center/dagger boards). First, there is the deeper draft, and secondly,
they stall out (lose lift) at a higher speed than do lower aspect
boards. This helps to explain why many traditional shoal draft types,
such as the Cape Cod Cats and Chesapeake Skipjacks, for instance, kept
their long, shallow, centerboards and barn door rudders. While these
appendages have a bit more drag and are not as "efficient" as a deep
high aspect foil, they maintain their lift (that is, continue to resist
leeway) at low speed and are very powerful, a necessary trait for
hauling dredges and nets.
Bob
center/dagger boards). First, there is the deeper draft, and secondly,
they stall out (lose lift) at a higher speed than do lower aspect
boards. This helps to explain why many traditional shoal draft types,
such as the Cape Cod Cats and Chesapeake Skipjacks, for instance, kept
their long, shallow, centerboards and barn door rudders. While these
appendages have a bit more drag and are not as "efficient" as a deep
high aspect foil, they maintain their lift (that is, continue to resist
leeway) at low speed and are very powerful, a necessary trait for
hauling dredges and nets.
Bob