Rudder pushrod-linkage

[DISAR]

I use these 2mm push rods, they are s/s. Tried to make thread with a 2mm die but couldn't. The s/s is very strong.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=200280825529

Do you know where to find 4-40 s/s? or 3mm s/s? By the way what is the diameter of the 4-40?
I absolutely agree with the CF. Pushrod-clevis from CF.

[longballlumber]

I have heard of people using SS welding rods for linkage. If your linkage sections are straight you can use hollow carbon/fiberglass rod as a reinforcment.

[DISAR]

You won't believe it. I have these as well, 2 or 3 mm I think. They are super strong and much stronger than the ones I mentioned above. I tried to make thread in the past but no way, there4 left them aside, they are really difficult to bend as well. But now I can epoxy the clevis or ball joint on one side and on the other side the ez connector. I will find them again, thanks. These I got from a shipbuilding yard.

[ozzie-crawl]

i spend most of my time at work tig welding so i have a ready supplie of 1.6-2mm s/s rod, but found thicker rod at a local hobby shop they have 4-40 (i thought 4-40 was a imperial measurment of some kind but this may not be rite) they have them for planes with a threaded end with or with out clevis there made by du-bro http://www.shopatron.com/product/par...161.5165.0.0.0

[DISAR]

Is this rod s/s or galvanized?

[ozzie-crawl]

the ones i got are stainless steel

[crrcboatz]

If you want stainless steel, use bicycle spokes. They are VERY strong. You will need to silver solder your connections though.

Curt

[DISAR]

Thanks Curt. I will check on these as well.

Yesterday night I reassembled (again) the linkage. Tried to fit the s/s welding rods (I have 2, 2.4 and 3mm rods) soldered the threaded coupler but finally decided to use the 2mm rods which are threaded on one end, fitted a Sullivan clevis there (servo side) and an ez-connector that i found on the rudder side. Let's see how it will perform. Relocated also the servo as close as possible to transom.

[Simon.O.]

From an asthetic point of view I like to fit the clevis or ball end at the rudder and the ezi-connector at the servo (inside).
Your boat, your call.

[ozzie-crawl]

on my boats i run a clevis on the servo side and on the rudder end its hard to explain look at picture

[Simon.O.]

on my boats i run a clevis on the servo side and on the rudder end its hard to explain look at picture

You are Australian and you lot do most stuff backwards.
Clevis or ball outside, at the rudder horn , ezi-connector inside at the servo horn.
Really it is so hard ??

Wait untill I have the new rudder setup for a Cat I may build.
Designing and building the hardware is half of the fun, I have most of the rudder setup done.

[DISAR]

I ordered some 4-40 push rods and various connectors as well, just in case. I saw that the 4-40 is 0.093" diameter which is about 2.4 mm.

[ozzie-crawl]

this is were i should say somthing about sheep but will leave that alone
my rudders have that setup and and works rather well
on another note here is a link you may or may not have seen has some good info http://boatdesign.net/articles/tunne...sign/index.htm

[longballlumber]

I use these on the servo end (solder)

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXK084&P=7

I use these on the rudder end up to 4S boats.

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXD912&P=M

Just a note on the dubro swivel ball links. I get the version for the 2-56 then I redrill the plastic and thread in my 4-40 rod. Works Great. I also always use the speedmaster mini (.21)
rudder assembly. The hole in the rudder are are already the correct size to tap a 2-56 thread into it.

[DISAR]

Nice. Which 4-40 rod are you using? Is it s/s or galvanized?
There are the Dubro Heavy Duty 4-40 ball links available also which I suppose fit the 4-40 rods.

http://cgi.ebay.com/Dubro-Heavy-Duty-Ball-Link-4-40-2_W0QQitemZ350187463153QQihZ022QQcategoryZ34056QQtcZphotoQQcmdZViewItemQQ_trksidZp1713.m153.l1262