Coaming pulley

[Lights]

I was looking at the Decembers propeller and noticed that John Palmguist, Brent Dillard and Brent Tate are all using some kind of nylon round stock for coaming pulley's on there J/A hydros. can someone explane or give a drawing of these to me? What are they using for stearing cable? wouldn't cable curl without a pully or are they using sailboat rigging rope?

I know I ask alot of ? forgive me.

Lights

[sam]

I believe Sam Hemp is using Delron. In order to use a solid guide instead of a pulley, you must use un coated cable; but it doesn't suffer from any curling problems.

[The MercKid]

You can call them coaming pulleys but they are really guides as there are no moving parts. Delrin blocks work very well and when using 7x19 SS cable 3/32 in diameter is light and foolproof and has a higher working load rating than ordinary vinyl coated steering cable. They have used 5/8 inch diameter pulleys on the steering bar on CSH and CMH boats so the cable easily goes around 1/4 to 3/8 inch radius. Don't use galvanized cable to save money as it is far stiffer for the same size and construction. Round stock is used so a turned down section goes thru a 3/4 inch hole in the cockpit side to positively position them so there is no load on the mounting screws save for holding the block in place. Their blocks were made so they could be rotated in different mounting positions if the cable wore into it but this has never been an issue and none have ever needed to be rotated. The only problem with the SS cable is that it is slippery on the steering hub so a clamp or knot should be placed inside the hub so it can't slip- a typical tunnel boat trick.

[Lights]

The Merckid, Thanks for the info. I now know how to make them. I'll have to turn some up at work. We have lots of Delrin laying around.

[Matt Dagostino]

Razor Wire!!

Be aware ! I have 2 Boats with stearing systems as described. Just make sure you never have to switch motors and re-adjust the cable lengths. Also after a while the cable ends begin to frey ever so slightly and the cable is so fine that you can hardly see it and it cuts you like razor wire !!

Besides those issues it does save a pound or two in weight and looks pretty cool................

Have fun!!

[jsilvestri]

Question; Why not use the coated steel braided/twisted cable?

[sam]

coated cable sticks to the Delron like adhesive, won't slide through it

[The MercKid]

A drop of epoxy on the end of the cable will help with the frayed ends. They are sharp and can poke neat little holes in your fingers. The other suggestion is to adjust cable length to the shorter motor and then add shackles or rings to get the necessary length for the longer one. Then just add or remove the spacers rather than having to continually alter the cable clamps.

[epugh66]

The east german boat builder, Bernhard Danisch, used solid wood for his cable guides. Not as fancy as delrin, but probably more plentiful in "cold war" eastern europe.

[HYDRO21Z]

one more question

Has anyone used the spectra/vectran rigging rope with the Delrin blocks?
I bought some cool looking black spectra 3/16" rope to use for my
steering but it will not fit thru the Brown coaming pully.
Any suggestions?
Dennis 21Z

[Tom Cronk]

C Pulleys

Dennis
I have the Keller pulleys that will do the job for you.Will be at Jesup Friday AM with all my hardware.
Tom

[The MercKid]

Delrin blocks will only work with plain metal cable. Any woven or plastic covering/coating will not work as the cable slides on the delrin block while cable coverings are suited to pulleys where they go around on the pulley, not slide over the surface. Ropes and covered cables aren't intended for a sliding environment.