• Welcome to this website/forum for people interested in the Morgan 38 Sailboat. Many of our members are 'owners' of Morgan 38s, but you don't need to be an owner to Register/Join.

rudder design

B

budfet

bud fetter
<div>Is anyone interested in a rudder design that will improve both
upwind and downwind control of the early 38's?
</div>
 
I would be interested in learning more. My 1972 M-38 equipped with low tech sails is a real dog in light air.

 

I understand that Morgan added a piece to the top of the rudder on the 38-4 models. With the higher mast and larger jib, they tended to have a weather helm. My 38-3 was retrofited with one of these after the previous owner had the rudder split on hitting a sand bar while leaving Ocean City Inlet, his home port. The addition to the to appears to have corrected the problem. Various write ups( not sure which Practical Sailor, or Spin Sheets) mention this.
 
I now have pictures of the rudder I designed if anyone is interested in receiving them via the net. This rudder is 10
to 12 inches deeper which will add more rudder where it is
needed; the upper part airated by the prop is ineffective.
This design is also helpful for anyone having a 6 ft. draft
vessel.
 
In the words of the great east Indian Prophet, Binhdare Dundhatt. Here are the facts. 1. Old rudder and part of the skeg weighted 156#'s. New rudder being 12" long & about 3 more sq.ft. in area weights 90#'s and is positively bouyant. We commissioned a design by Carl Schumacher in Alameda, Ca. The finished product is undergoing sea trials and so far we are ecstatic. It was about 3.5 to 4.5 standard boat units ($3-4k)
 
In the words of the great east Indian Prophet, Binhdare Dundhatt. Here are the facts. 1. Old rudder and part of the skeg weighted 156#'s. New rudder being 12" longer & about 3 more sq.ft. in area weights 90#'s and is positively bouyant. We commissioned a design by Carl Schumacher in Alameda, Ca. The finished product is undergoing sea trials and so far we are ecstatic. It was about 3.5 to 4.5 standard boat units ($3-4k)
 
Is the message that the 6 foot draft boats are more in need of a bigger rudder than the 5 footers? What is the theory that explains that?
 
<div>I am building a rudder for my Collin Archer 40 (the previous rudder disintegrated due to faulty fabrication). The CA40 design is similar to that of a Westsail, they both are re-estalished designs of Norwegian rescue boats.I am trying to design in better contol for mauevering under auxiliary power. My concerns are to reduce turbulance on the leading edge where flow will differ for the upper, middle, and lower keel/stern interface to the rudder. I think I may have solved the aft edge tubulance by feathering it to reduce vortex coming off the terminal edge.I can not say if my reasoning is correct. The best I can do is attempt to instill as laminar a flow stream as possible. I've not found any flow calculations to provide better guidance. Best approach -- engineer a calculation and ewag it (engineering wild assed guess).
</div>
 
You must log in or register to reply here.
Back
Top