You guys are pretty close to right, but if ya want to see drawings on how steering on a towboat can be mimic-ed, just drop by my website, cause its all covered in full details and drawings.....
Shucks, ole Joe can tell ya, "I can use my model towboats = rc duel steering & duel engines to even "Walk'Um Sideways!" .... With Barges Too!! ..... Just like the real boats can do = (;-)) .... "No Brag, Jest FACT!!!! .... ORB
--- Original Message -----
Sent: Friday, July 10, 2009 8:57 PM
Subject: Re: [tugsandtows] Contra-Rotating props on a Tug boat
As i have had it explained to me many many moons ago! If you are looking forward at the wheels. If the top of the fluke, lets say the starboard just for example. If the top rotates clockwise it would be considered to be a Right hand wheel. Generally in my experience. The flukes of the wheels in a KORT nozzel are curved to meet the shape of the inside of the nozzel, they appear to be flattened out but there is a slight curvature to them. and the clearance between the fluke and the inside of the nozzel is pretty tight. Sometimes you could barely get your fingers between the two points. Where as an open wheel, the flukes are rounded off. As for whether an inboard or outboard rotating wheel is preferred. Depending on the boat and who is paying the bill and what ever other reasons you want to throw in the mix. Is just that..."It depends". Some say the wheels should roll inboard to help the boat "Walk" easier. In cases it has merit. But in my experience, if you have enough horse power in the boat you're driving, it doesn't matter. "BUT" and I mean a big one! If the wheels roll the same direction and you're going forward. You will more than likely have a whole lot different handling boat. But if your rudders are big enough. HMMMMMMMM!
On Wed, Jul 8, 2009 at 5:36 PM, Robert Seiden
<theseidens@earthlink.net> wrote:
I recently acquired a completed Model Slipways "Dutch Courage" and have started to rebuild it. It is my First tugboat - eventually to be used, if/when needed, to rescue RC sailboats.
Dutch Courage has two props mounted in fixed Kort nozzles with rudders behind the nozzles.
The original builder used the Robbe plastic props that came with the kit.
Something seems wrong.
As viewed from the stern-
The LH prop, which is marked Robbe 50 "L" is definitely a clockwise-rotating prop.
The RH prop marked Robbe 50 "R" is designed to rotate counter-clockwise.
This means that if used as marked, these tops of these props rotate from the outside of the hull toward the inside.
I did a lot of research online and everything I read says that the tops of contra-rotating props rotate from the inside out. The props' "downstroke" is normally toward the outside - away from the centerline.
Granted that they are inside the Kort shrouds. How do you "experts" out there set your twin-screw tugboat prop rotation? Is there a difference between props in a Kort nozzle and props with no shroud? In which direction should these props of mine rotate?
Thanks in advance.
bob seiden
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