NACRA RUDDER TRIM SCREW.

They were made by Nacra, not sure if they are still available.
Almost all the originals have gone brittle & come apart.
I made a bunch of them years ago, & sent them to people for cost + shipping. I think I still have some left. IIRC the original Nacra part was 3/4” long.
However, some people wanted longer ones, so I made them in 1”, or even a bit longer lengths.
PM me an email addy, I’ll see what I have tomorrow & send you a photo.
Get the appropriate tap or thread chaser & clean up the casting before trying to install new ones. Put a bit of grease, or even petroleum jelly on them.

delrin screws custom made?
how did you that?
or is that a stupid question?

Purchased a 6’ length of solid Delrin rod from McMaster Carr. I have quality tap & die sets. It takes some work, but I threaded the rods to match the castings, IIRC they are 16 to an inch. I then simply cut to whatever length is required, taper one end a bit so they start easier, (it’s easy to cross thread plastics), & add a slot for a screwdriver.
I did the same for mast balls. Sourced a dozen delrin balls of the correct size, drilled & tapped them to match the DS rod. Don’t have any of those left.

Edited by Edchris177 on Aug 19, 2021 - 09:43 PM.

Thanks again to Edchris for my Delrin rudder screws. The old ones were gone and really appreciate a forum member stepping up.

you think a rubber stopper or cork could be used?

Would the Hobie part work?

rungi wrote: you think a rubber stopper or cork could be used?

No, they are not hard enough to withstand the slam when you pull the rudders down.
I will put a couple delrin ones in the mail for you in Monday when the post office opens.

Here are two pictures one shows the rudder with broken trim screw not hitting the bottom of the boat
the other shows the rudder without a trim screw hitting the bottom of the boat.
Not sure if the rudders have been modified, but they look nice. Anyone familiar with this rudder system?

Edited by rungi on Aug 22, 2021 - 02:46 PM.

Something ain't right with that rudder

The rudder works perfectly.
It just needs trim screws.

What is wrong with it?

That is not a skeg hull Nacra (5.7 or 5.0), rudder blade.
Factory blades do not have that cutout, the leading edge is straight, until near the tip. That is why it is hitting the hull.
I don’t know if they are from a different boat, or the previous owner smashed the hell out of them, then cut & sanded to remove the damage.

Go back & look at my album, the photo showing how to rig the rudders...you will see yours are totally different. Look closely at my photo, you will understand how the bungee pulls the blade up, & the line pulls it down. I The pivot pin is in the wrong place.
If they end up working, I can only say use them.
I sent you an email showing our N5.0 at the dock, the rudders are identical to the 5.7.

I actually have mis-matched rudders. One is like what is shown in the image above by rungi, the other is the stock 5.7 rudder. Notice port side has a straight profile, and starboard has a cutout. I need to find a new rudder for my 5.7 that has the straight profile, but they are not very common to find. FWIW, they work!

Duplicate deleted

Edited by tominpa on Aug 22, 2021 - 08:12 PM.

Does the one like mine hit the bottom if the trim screw is out?

rungi wrote: Does the one like mine hit the bottom if the trim screw is out?

Yes, but I got new trim screws from Edchris last year and that solved the problem. I'll just add having the trim screws too far out, gives a weather helm, but without them, the boat will have almost no weather helm at all and may even turn downwind which can feel pretty unstable. Mast rake also affects weather helm (the tendency to turn upwind).

Edited by tominpa on Aug 23, 2021 - 08:59 AM.

that is what I wanted to hear
thank you

What would you say is the typical distance from the rudder to the casting when well-adjusted? I currently have a 1/8" strip of gasket rubber glued to the inner casting, which acts as a great cushion when pulling the rudders down hard, and she seems to steer pretty well.

i think the 1990 nacra 5.0 has this type of rudder
why do you want the flat one?

tominpa wrote: I need to find a new rudder for my 5.7 that has the straight profile

I have the notched variant (1 piece) available now on eBay if you're interested in matching the starboard side. The notch was added so you could rake the rudders further up under the boat to dial out weather helm.

https://www.ebay.com/itm/224377215644

Edchriss177 wrote: That is not a skeg hull Nacra (5.7 or 5.0), rudder blade.

Ed, it is a factory blade for the 5.0/5.7 (late models) and was even used on some early 500s.

The notched model raises higher for transport and on the beach which is nice. Both can drag in the water for shallow steering. I kind of like the notched one better, and as long as the trim screw is in place, it doesn't smack the hull. Thanks for link.

The notched model raises higher for transport and on the beach which is nice

I wanted that on my N5.5 with the non-notched rudders. The rudders are always touching the sand, more than with the 5.0 and 5.7 because it doesn’t have the skeg, so the transom is closer to the ground. So i made a cut on the tiller arm tube to give the rudder more room. It worked, but another problem appeared: the rudder still touches the ground but only the part closer to the transom, unfortunately that’s where the control line is attached to the rudder and now it’s the line that touches the ground. Not a problem on sand but it often touched harder ground and eventually got damaged . I’m more careful after I realized, not a big deal but the modification didn’t work as to forget about it.

Edited by Andinista on Aug 25, 2021 - 05:14 AM.