Got a prop question...
I should know this, but apparently I'm confused about something.
Therefore an appeal to the group for the following questions. What is the net effect of increasing diameter with the same pitch? What is the net effect of increasing/decreasing the pitch with the same diameter? I ask because I was discussing props with a friend today and I had something totally confused. |
Got a prop question...
On Fri, 28 Mar 2008 23:06:32 GMT, Short Wave Sportfishing
wrote: Therefore an appeal to the group for the following questions. What is the net effect of increasing diameter with the same pitch? More thrust, greater prop efficiency (less slip), requires more torque (horsepower) to maintain the same RPMs, more vibration if tip clearance is insufficient. What is the net effect of increasing/decreasing the pitch with the same diameter? Greater forward motion with each turn, more slip unless a light easily driven hull, requires more torque (horsepower) to maintain the same RPMs. Either should cause speed to increase by some amount if RPMs can be maintained. |
Got a prop question...
"Short Wave Sportfishing" wrote in message ... I should know this, but apparently I'm confused about something. Therefore an appeal to the group for the following questions. What is the net effect of increasing diameter with the same pitch? What is the net effect of increasing/decreasing the pitch with the same diameter? I ask because I was discussing props with a friend today and I had something totally confused. A friend (who posts here) explained it to me once. But, now I forget. Eisboch |
Got a prop question...
"Wayne.B" wrote in message ... On Fri, 28 Mar 2008 23:06:32 GMT, Short Wave Sportfishing wrote: Therefore an appeal to the group for the following questions. What is the net effect of increasing diameter with the same pitch? More thrust, greater prop efficiency (less slip), requires more torque (horsepower) to maintain the same RPMs, more vibration if tip clearance is insufficient. *That's* what I forgot ..... better prop efficiency with less slip. Eisboch |
Got a prop question...
On Fri, 28 Mar 2008 20:06:35 -0400, Wayne.B
wrote: On Fri, 28 Mar 2008 23:06:32 GMT, Short Wave Sportfishing wrote: Therefore an appeal to the group for the following questions. What is the net effect of increasing diameter with the same pitch? More thrust, greater prop efficiency (less slip), requires more torque (horsepower) to maintain the same RPMs, more vibration if tip clearance is insufficient. What is the net effect of increasing/decreasing the pitch with the same diameter? Greater forward motion with each turn, more slip unless a light easily driven hull, requires more torque (horsepower) to maintain the same RPMs. Either should cause speed to increase by some amount if RPMs can be maintained. That's what I thought. Hmmm... |
Got a prop question...
On Fri, 28 Mar 2008 20:15:01 -0400, "Eisboch" wrote:
"Short Wave Sportfishing" wrote in message .. . I should know this, but apparently I'm confused about something. Therefore an appeal to the group for the following questions. What is the net effect of increasing diameter with the same pitch? What is the net effect of increasing/decreasing the pitch with the same diameter? I ask because I was discussing props with a friend today and I had something totally confused. A friend (who posts here) explained it to me once. But, now I forget. That's my problem. I was talking about props and by the time I finished the conversation, I was totally confused about something that I thought I knew. :) Of course being older than dirt, sometimes 'ya forget stuff 'ya know? |
Got a prop question...
"Short Wave Sportfishing" wrote in message ... Of course being older than dirt, sometimes 'ya forget stuff 'ya know? It's a blessing in disguise. Going to look at a boat tomorrow. Eisboch |
Got a prop question...
On Fri, 28 Mar 2008 21:11:29 -0400, "Eisboch" wrote:
"Short Wave Sportfishing" wrote in message .. . Of course being older than dirt, sometimes 'ya forget stuff 'ya know? It's a blessing in disguise. Going to look at a boat tomorrow. Cool. Outboards? :) |
Got a prop question...
You hit the rocks sooner(lol).
"Short Wave Sportfishing" wrote in message ... I should know this, but apparently I'm confused about something. Therefore an appeal to the group for the following questions. What is the net effect of increasing diameter with the same pitch? What is the net effect of increasing/decreasing the pitch with the same diameter? I ask because I was discussing props with a friend today and I had something totally confused. |
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