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#1
posted to rec.boats
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Boats and motorcycles
Ok. Now that we all understand and agree on the mechanics of steering a
motorcycle, let's consider this situation. Twin screw inboard. No wind. Little or no current. Helm hard over to port. Starboard engine at idle Starboard transmission in "forward". Port engine at idle Port transmission in "reverse". Which way will the boat move? Eisboch |
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#2
posted to rec.boats
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Boats and motorcycles
On Fri, 1 Jun 2007 17:48:43 -0400, "RCE" wrote:
Ok. Now that we all understand and agree on the mechanics of steering a motorcycle, let's consider this situation. Twin screw inboard. No wind. Little or no current. Helm hard over to port. Starboard engine at idle Starboard transmission in "forward". Port engine at idle Port transmission in "reverse". Which way will the boat move? Eisboch left |
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#3
posted to rec.boats
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Boats and motorcycles
"RCE" wrote in message ... Ok. Now that we all understand and agree on the mechanics of steering a motorcycle, let's consider this situation. Twin screw inboard. No wind. Little or no current. Helm hard over to port. Starboard engine at idle Starboard transmission in "forward". Port engine at idle Port transmission in "reverse". Which way will the boat move? Eisboch To which side is the captain leaning? 8) |
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#4
posted to rec.boats
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Boats and motorcycles
On Fri, 1 Jun 2007 18:39:24 -0400, "D.Duck" wrote:
"RCE" wrote in message ... Ok. Now that we all understand and agree on the mechanics of steering a motorcycle, let's consider this situation. Twin screw inboard. No wind. Little or no current. Helm hard over to port. Starboard engine at idle Starboard transmission in "forward". Port engine at idle Port transmission in "reverse". Which way will the boat move? Eisboch To which side is the captain leaning? 8) Duck, here is some info on 'countersteering' from Wikipedia. "Lean by countersteering When riding a bicycle or a motorcycle, countersteering is a method of initiating a turn by a small, momentary turn of the front wheel, usually via the handlebars, in the opposite (counter) direction. Like the book example above, this moves the pivot point (the wheels' contact patches) out from under the center of mass to establish the lean angle for a turn. While necessary at all speeds, the need to countersteer becomes more noticeable as speed increases. Hence, if a rider wants to turn to the right, he first throws the bike off balance by momentarily pointing the front wheel slightly to the left. The center of mass of the bike plus rider will continue in a straight line, but the contact patches of the tires move to the left with respect to this straight line." Note, it applies to motorcycles and bicycles. |
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#5
posted to rec.boats
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Boats and motorcycles
"RCE" wrote in message ... Ok. Now that we all understand and agree on the mechanics of steering a motorcycle, let's consider this situation. Twin screw inboard. No wind. Little or no current. Helm hard over to port. Starboard engine at idle Starboard transmission in "forward". Port engine at idle Port transmission in "reverse". Which way will the boat move? Eisboch It depend whether or not JohnH be at the helm. |
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#6
posted to rec.boats
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Boats and motorcycles
"JimH" wrote in message ... "RCE" wrote in message ... Ok. Now that we all understand and agree on the mechanics of steering a motorcycle, let's consider this situation. Twin screw inboard. No wind. Little or no current. Helm hard over to port. Starboard engine at idle Starboard transmission in "forward". Port engine at idle Port transmission in "reverse". Which way will the boat move? Eisboch It depend whether or not JohnH be at the helm. Oops..........*will* be at the helm. ;-) |
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#7
posted to rec.boats
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Boats and motorcycles
On Jun 1, 4:48?pm, "RCE" wrote:
Ok. Now that we all understand and agree on the mechanics of steering a motorcycle, let's consider this situation. Twin screw inboard. No wind. Little or no current. Helm hard over to port. Starboard engine at idle Starboard transmission in "forward". Port engine at idle Port transmission in "reverse". Which way will the boat move? Eisboch Depends on how long the boat is. May not go anywhere considering engines are at idle |
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#8
posted to rec.boats
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Boats and motorcycles
"Tim" wrote in message oups.com... On Jun 1, 4:48?pm, "RCE" wrote: Ok. Now that we all understand and agree on the mechanics of steering a motorcycle, let's consider this situation. Twin screw inboard. No wind. Little or no current. Helm hard over to port. Starboard engine at idle Starboard transmission in "forward". Port engine at idle Port transmission in "reverse". Which way will the boat move? Eisboch Depends on how long the boat is. May not go anywhere considering engines are at idle Oh, it will move. I posed the question poorly. Better questions a Which way will the bow move? Which way will the stern move? Eisboch |
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#9
posted to rec.boats
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Boats and motorcycles
On Jun 1, 7:06?pm, "RCE" wrote:
"Tim" wrote in message oups.com... On Jun 1, 4:48?pm, "RCE" wrote: Ok. Now that we all understand and agree on the mechanics of steering a motorcycle, let's consider this situation. Twin screw inboard. No wind. Little or no current. Helm hard over to port. Starboard engine at idle Starboard transmission in "forward". Port engine at idle Port transmission in "reverse". Which way will the boat move? Eisboch Depends on how long the boat is. May not go anywhere considering engines are at idle Oh, it will move. I posed the question poorly. Better questions a Which way will the bow move? Which way will the stern move? Eisboch- Hide quoted text - - Show quoted text - OK, well then, I must have posted my answer poorly. If it's moored bow first in a slip it probably won't go anywhere |
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#10
posted to rec.boats
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Boats and motorcycles
"RCE" wrote in message ... "Tim" wrote in message oups.com... On Jun 1, 4:48?pm, "RCE" wrote: Ok. Now that we all understand and agree on the mechanics of steering a motorcycle, let's consider this situation. Twin screw inboard. No wind. Little or no current. Helm hard over to port. Starboard engine at idle Starboard transmission in "forward". Port engine at idle Port transmission in "reverse". Which way will the boat move? Eisboch Depends on how long the boat is. May not go anywhere considering engines are at idle Oh, it will move. I posed the question poorly. Better questions a Which way will the bow move? Which way will the stern move? Eisboch With the rudder in the neutral position the boat would pivot to port. With the rudder hard port one may think the boat may tend to move even more aggressively (bow) to port.........but the correct answer will probably be the bow moving to starboard. ;-) |
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