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#1
posted to rec.boats
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Got my prop wrench (boating post)
I just got my brand new Yamaha prop wrench from an eBayer at a nice
discount. It's time for the painful (expensive) search for the perfect prop. I know I need to drop the pitch by at least two inches. A cup may be in order to improve the hole shot. The stock aluminum prop doesn't "bite" quick enough and lacks in the top end by 750 rpm's. The variables are endless - diameter, pitch, cup, venting, etc. so this time I'm trying something new. I have a good idea of what the diameter and pitch should be. I'll get a SS prop in that size and let the prop shop tweak it for me. The one thing I know for sure is the F90 is best suited for a three-blade prop rather than a four. Once that is settled, I'm going to look further into the value of a narrow jack plate. So far it looks like the hydraulic plates aren't much more $$ than a manual. |
#2
posted to rec.boats
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Got my prop wrench (boating post)
On Thu, 12 Feb 2009 20:46:13 -0500, D K
wrote: The one thing I know for sure is the F90 is best suited for a three-blade prop rather than a four. Three is always more efficient than four. Four blades is a way to get the blade area in a smaller diameter, if you lack space. Casady |
#3
posted to rec.boats
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Got my prop wrench (boating post)
Richard Casady wrote:
On Thu, 12 Feb 2009 20:46:13 -0500, D K wrote: The one thing I know for sure is the F90 is best suited for a three-blade prop rather than a four. Three is always more efficient than four. Four blades is a way to get the blade area in a smaller diameter, if you lack space. Casady My admittedly limited experience with Yamaha taught me that the company is pretty damned good matching up engines, props and boats, and that a good dealer is also a valuable resource in prop selection. When I took delivery of my 2008 model boat, the boat factory had just changed the prop it spec'd for the boat and engine combo, upon a suggestion from Yamaha. The factory sent me copies of performance print-outs for several props. I was able to almost exactly duplicate the performance on the factory print-out. Almost every outboard boat I considered has performance sheets available from the engine manufacturer, and those sheets specify props. |
#4
posted to rec.boats
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Got my prop wrench (boating post)
On Feb 13, 9:43*am, HK wrote:
Richard Casady wrote: On Thu, 12 Feb 2009 20:46:13 -0500, D K wrote: The one thing I know for sure is the F90 is best suited for a three-blade prop rather than a four. Three is always more efficient than four. Four blades is a way to get the blade area in a smaller diameter, if you lack space. Casady My admittedly limited experience with Yamaha taught me that the company is pretty damned good matching up engines, props and boats, and that a good dealer is also a valuable resource in prop selection. When I took delivery of my 2008 model boat, the boat factory had just changed the prop it spec'd for the boat and engine combo, upon a suggestion from Yamaha. The factory sent me copies of performance print-outs for several props. I was able to almost exactly duplicate the performance on the factory print-out. Almost every outboard boat I considered has performance sheets available * from the engine manufacturer, and those sheets specify props. Really? How did they know your exact requirements as far as weight, loading fore and aft, etc.? |
#5
posted to rec.boats
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Got my prop wrench (boating post)
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#6
posted to rec.boats
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Got my prop wrench (boating post)
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#7
posted to rec.boats
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Got my prop wrench (boating post)
On Feb 13, 1:24*pm, wrote:
On Fri, 13 Feb 2009 18:17:35 GMT, (Richard Casady) wrote: On Fri, 13 Feb 2009 07:29:13 -0800 (PST), wrote: On Feb 13, 9:43*am, HK wrote: Richard Casady wrote: On Thu, 12 Feb 2009 20:46:13 -0500, D K wrote: The one thing I know for sure is the F90 is best suited for a three-blade prop rather than a four. Three is always more efficient than four. Four blades is a way to get the blade area in a smaller diameter, if you lack space. Casady My admittedly limited experience with Yamaha taught me that the company is pretty damned good matching up engines, props and boats, and that a good dealer is also a valuable resource in prop selection. When I took delivery of my 2008 model boat, the boat factory had just changed the prop it spec'd for the boat and engine combo, upon a suggestion from Yamaha. The factory sent me copies of performance print-outs for several props. I was able to almost exactly duplicate the performance on the factory print-out. Almost every outboard boat I considered has performance sheets available * from the engine manufacturer, and those sheets specify props. Really? How did they know your exact requirements as far as weight, loading fore and aft, etc.? They give you one in the middle of the range of props that are individually ideal for one of the varying conditions. My sprint car has a quick change rear axle. You can change the gear ratio in a couple of minutes. There are three brands around, and they all have a magnesium case. Stuff is brittle, but there are no impact loads. They have variable pitch props for ships and planes. Variable pitch props and adjustable pitch props are two different things.- Hide quoted text - - Show quoted text - Um, and adjustable pitch prop IS variable. |
#9
posted to rec.boats
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Got my prop wrench (boating post)
wrote:
On Fri, 13 Feb 2009 18:17:35 GMT, (Richard Casady) wrote: On Fri, 13 Feb 2009 07:29:13 -0800 (PST), wrote: On Feb 13, 9:43 am, HK wrote: Richard Casady wrote: On Thu, 12 Feb 2009 20:46:13 -0500, D K wrote: The one thing I know for sure is the F90 is best suited for a three-blade prop rather than a four. Three is always more efficient than four. Four blades is a way to get the blade area in a smaller diameter, if you lack space. Casady My admittedly limited experience with Yamaha taught me that the company is pretty damned good matching up engines, props and boats, and that a good dealer is also a valuable resource in prop selection. When I took delivery of my 2008 model boat, the boat factory had just changed the prop it spec'd for the boat and engine combo, upon a suggestion from Yamaha. The factory sent me copies of performance print-outs for several props. I was able to almost exactly duplicate the performance on the factory print-out. Almost every outboard boat I considered has performance sheets available from the engine manufacturer, and those sheets specify props. Really? How did they know your exact requirements as far as weight, loading fore and aft, etc.? They give you one in the middle of the range of props that are individually ideal for one of the varying conditions. My sprint car has a quick change rear axle. You can change the gear ratio in a couple of minutes. There are three brands around, and they all have a magnesium case. Stuff is brittle, but there are no impact loads. They have variable pitch props for ships and planes. Variable pitch props and adjustable pitch props are two different things. ??? |
#10
posted to rec.boats
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Got my prop wrench (boating post)
HK wrote:
Richard Casady wrote: On Thu, 12 Feb 2009 20:46:13 -0500, D K wrote: The one thing I know for sure is the F90 is best suited for a three-blade prop rather than a four. Three is always more efficient than four. Four blades is a way to get the blade area in a smaller diameter, if you lack space. Casady My admittedly limited experience with Yamaha taught me that the company is pretty damned good matching up engines, props and boats, and that a good dealer is also a valuable resource in prop selection. When I took delivery of my 2008 model boat, the boat factory had just changed the prop it spec'd for the boat and engine combo, upon a suggestion from Yamaha. The factory sent me copies of performance print-outs for several props. I was able to almost exactly duplicate the performance on the factory print-out. Almost every outboard boat I considered has performance sheets available from the engine manufacturer, and those sheets specify props. This isn't my center console, it's a $22K aluminum bass boat made by Yamaha. |
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