On Wed, Apr 11, 2018 at 9:43 PM, '.' eruttan@yahoo.com [harryproa] <harryproa@yahoogroups..com.au> wrote:
Rob, et.al.:
Apologies in advance for a noob question.
I have read how your rudder system has evolved. I think you have it well sorted now, but i did wonder, have you ever experimented with rudders that change direction in a shunt via being raised and rotated 180 deg around the 'kick up' axis?
I have read that t speer designed a double symmetrical foil that works well, (NACA0012 like) and that seems a simpler rudder system.
I was wondering if asymmetric foils that flip might be less wetted area and higher lift or lift/drag. Perhaps a racer option?
We have tried both, with success. The latest boats have the Speer sections, http://www.basiliscus.com/ProaSections/ProaIndex.html or modified NACA sections.
The current set up is "well sorted", but we have been saying that about each iteration for years! Then someone thinks of an improvement. This process is ongoing. We are currently working on a set up which is so simple that "if there was anything less there would be no rudder". On the 24m/80' cargo ferry (which has been simplified down to 6 tonnes/tons empty) it saves almost 200 kgs and a couple of hundred hours of fiddly work, resulting in a system which is easier to operate than anything previous. I am in the throes of making a model to check that everything behaves as it should.
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Posted by: Rob Denney <harryproa@gmail.com>
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