Fishtail Rudder

[Bob Abell 2Participant @bobabell2]

Sorry Len!……This picture ain`t worth a thousand words!….Can`t make head nor tail of it…..really need a closeup side view please…..fancy making one for my launch….Ritalea…..see my album

[JC Uknz 1Participant @jcuknz1]

Another string to my bow is that of photography and while many digital cameras can come in close it is often better to use a moderate Close-up lens to achieve this.  ironically the CU lens keeps the camera away from the subject permiting light to illuminate the subject etc but permits you to use the telephoto end of the zoom to get the tight framing.

It strikes me that in the above shot the eye saw the rudder and concentrated on it forgetting that the camera also seems to have perifial vision

Meanwhile quite recently I have discover4ed what that little box in the bottom right on my screen does .. usually 100% but one can use 400% and see what a fishtail rudder looks like.

I don’t appreciate what a fishtail does over a ‘balanced’ rudder which when turned covers the thrust from the propellor .. also how it is operated to tail to port?  It appears to move the sideways thrust a little further back but does that really make much difference?  Basically, why a fishtail?

[Len OchiltreeParticipant @lenochiltree67043]

 I can’t be perfect at everything, sending another pic to my gallery.

                       

[JC Uknz 1Participant @jcuknz1]

Sorry I was trying to be helpful to you and others who might read the thread.

How does a fishtail work?

[John BalmerParticipant @johnbalmer87954]

has anybody out there built the tsekoa canadian coastguard version

[Len OchiltreeParticipant @lenochiltree67043]

Hi JC,

It works like a normal rudder except that the turned out rear edges shoot the flow of water at 90 deg angle and thus spinning the boat in its own length,this can be done with only 1 motor and 1 rudder, saving lots of Money!

             Len           

      Ps,   I have drawn a sketch and sent to my gallery 

[Bob Abell 2Participant @bobabell2]

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