RE: Spray rails on Supercat 17

Technical discussion of ARC products
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Posts: 1
Joined: July 3rd, 2013, 12:06 pm
Boat Make/Model: Supercat 17

RE: Spray rails on Supercat 17

Post by alexfoxfox » October 9th, 2017, 2:27 pm

Dear All,

After 3 years of happy sailing I am in the process of fairing and re-gelcoating of my 1983 Supercat 17. There is a pretty substantial amount of work as it has developed pretty big "waves" on the hull surfaces between bulkheads over the years (bought it this way). As the work will continue for a few months through the winter I was thinking that maybe it is the right time to add the spray rails (analogous to the ones used on Hobie Wild Cat) provided it is worth the effort.

So my question this:
Did anybody tried or thought about using such spray rails and if yes are there any recommendations or thoughts about the width , height and longitudinal position of such spray rails?
It seems that if they really work (the following reference claims they reduce the frictional resistance by ~12% at 20 knots based on tank testing of sailing cats: ... 094246.pdf ) then the Supercat/ARC would benefit them most due to the hull shape.

Besides they look cool... :-)

Best Regards,


Mac M
Posts: 224
Joined: June 13th, 2012, 2:05 am
Boat Make/Model: SC20 & 17
Location: Lugoff, SC

Re: RE: Spray rails on Supercat 17

Post by Mac M » October 11th, 2017, 2:05 am

Seems like more trouble than it's worth to me.

Self tacking jib is a great upgrade to a 17 and definitely easier than modifying the hull shape. Spinnakers are fun too!

Matt Haberman
Posts: 501
Joined: November 10th, 2003, 6:22 pm
Location: Minnesota

Re: RE: Spray rails on Supercat 17

Post by Matt Haberman » October 11th, 2017, 9:45 am

I have not had a chance to read the entire publication but I don't think I would waste my time doing it.
A couple of things to consider:
  • It appears that all of the gains they talk about are around the 20-23 knot range. Pretty unlikely you will ever see 20 knots on 17 and even if you did it would only be for a very short period of time. So the question is what type of gains do you see at more typical boat speeds? My guess is that it is minimal at best.
  • All of this is based on tank tests which probably don't represent the typical sea state that you will be sailing in. I would suspect that most gains are lost in a typical sea state....
Matt Haberman
Aquarius Sail Inc.

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