PROP - Aluminium or Stainless
- Wind Chime
- Captain
- Posts: 866
- Joined: Sun Jan 21, 2007 4:30 pm
- Sailboat: MacGregor 26X
- Location: Vancouver, B.C. Canada. 2000-26X, Suzuki-50hp, 8' Walker-Bay tender (with sailkit)
- Contact:
PROP - Aluminium or Stainless
Our main aluminium prop has a few dings and twists in it from years of regular use so am considering taking it in to get refurbished, but was also thinking maybe put the repair money towards a stainless prop. I have the correct pitch and diameter for our load.
Thought I would run it by everyone about what you use and why?
Pros for both Aluminium and Stainless Steel;
Aluminium pros - cheaper, softer so dings bend prop not shaft.
Stainless pros - better performance, last longer.
What do you have?
Thought I would run it by everyone about what you use and why?
Pros for both Aluminium and Stainless Steel;
Aluminium pros - cheaper, softer so dings bend prop not shaft.
Stainless pros - better performance, last longer.
What do you have?
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- Chief Steward
- Posts: 93
- Joined: Mon Jun 01, 2015 10:10 am
- Sailboat: MacGregor 19
Re: PROP - Aluminium or Stainless
I don't think you would notice a large enough performance improvement with a 50hp to justify the extra price.
I bet very few folks with macs run stainless props.
I bet very few folks with macs run stainless props.
- dlandersson
- Admiral
- Posts: 4531
- Joined: Fri Aug 27, 2010 10:00 am
- Sailboat: MacGregor 26X
- Location: Michigan City
Re: PROP - Aluminium or Stainless
Anther consideration is where you sail - the kind of obstacles in the water.
On the south side of Lake Michigan, there really aren't any stumps, rocks, etc, so I have a stainless (and I have several aluminium). One season I played around with props quite a bit.
On the south side of Lake Michigan, there really aren't any stumps, rocks, etc, so I have a stainless (and I have several aluminium). One season I played around with props quite a bit.
Wind Chime wrote:Our main aluminium prop has a few dings and twists in it from years of regular use so am considering taking it in to get refurbished, but was also thinking maybe put the repair money towards a stainless prop. I have the correct pitch and diameter for our load.
Thought I would run it by everyone about what you use and why?
Pros for both Aluminium and Stainless Steel;
Aluminium pros - cheaper, softer so dings bend prop not shaft.
Stainless pros - better performance, last longer.
What do you have?
- NiceAft
- Admiral
- Posts: 6157
- Joined: Tue Feb 01, 2005 7:28 pm
- Sailboat: MacGregor 26M
- Location: Upper Dublin,PA, USA: 2005M 50hp.Honda4strk.,1979 Phantom Sport Sailboat, 9'Achilles 6HP Merc 4strk
Re: PROP - Aluminium or Stainless
One season you played around with props quite a bit...................aaand what Is this your version of a pregnant pausedlandersson wrote:Anther consideration is where you sail - the kind of obstacles in the water.
On the south side of Lake Michigan, there really aren't any stumps, rocks, etc, so I have a stainless (and I have several aluminium). One season I played around with props quite a bit.
Wind Chime wrote:Our main aluminium prop has a few dings and twists in it from years of regular use so am considering taking it in to get refurbished, but was also thinking maybe put the repair money towards a stainless prop. I have the correct pitch and diameter for our load.
Thought I would run it by everyone about what you use and why?
Pros for both Aluminium and Stainless Steel;
Aluminium pros - cheaper, softer so dings bend prop not shaft.
Stainless pros - better performance, last longer.
What do you have?
- dlandersson
- Admiral
- Posts: 4531
- Joined: Fri Aug 27, 2010 10:00 am
- Sailboat: MacGregor 26X
- Location: Michigan City
Re: PROP - Aluminium or Stainless
Actually no, one season (my second) I focused on props, getting several and changing them often. Got an inexpensive (cheap, really) inflatable I used to tied off on the rear of my X and swap out props. Hint, do it in the early am, before it gets hot.
FYI, I have a 97 X with a 50 HP Merc (non-bigfoot). Any suggestions on which 4 bladed prop I should think about getting? More interested in hauling my kids (tubing) than in getting 20 mph.
FYI, I have a 97 X with a 50 HP Merc (non-bigfoot). Any suggestions on which 4 bladed prop I should think about getting? More interested in hauling my kids (tubing) than in getting 20 mph.
NiceAft wrote:One season you played around with props quite a bit...................aaand what Is this your version of a pregnant pausedlandersson wrote:Anther consideration is where you sail - the kind of obstacles in the water.
On the south side of Lake Michigan, there really aren't any stumps, rocks, etc, so I have a stainless (and I have several aluminium). One season I played around with props quite a bit.
Wind Chime wrote:Our main aluminium prop has a few dings and twists in it from years of regular use so am considering taking it in to get refurbished, but was also thinking maybe put the repair money towards a stainless prop. I have the correct pitch and diameter for our load.
Thought I would run it by everyone about what you use and why?
Pros for both Aluminium and Stainless Steel;
Aluminium pros - cheaper, softer so dings bend prop not shaft.
Stainless pros - better performance, last longer.
What do you have?
- Terry
- Admiral
- Posts: 1487
- Joined: Thu Feb 19, 2004 2:35 pm
- Sailboat: MacGregor 26M
- Location: Vancouver, B.C. Canada. '03 26M - New Yamaha 70
Re: PROP - Aluminium or Stainless
The most economical route is to have your current prop refurbished $50-$100 tops. There is a shop on Minoru Blvd in Richmond just behind the MV branch where I took mine.
A new SS prop will set you back a few hundred bucks!!
That said, there are still some things to consider. I have heard that SS will give you better performance, maybe even add some pitch because it is thinner. Also heard that being heavier it might take more energy to spin, not sure I believe that though. I do believe better performance though, maybe more speed. They can still be damaged though depending on what they hit. If I had the extra cash I might try a SS just to see what it can do. Being SS they would not flex as much as an aluminum one and being thinner they have less resistance in the water. Unfortunately the extra cost is more than the return you get in performance.
A new SS prop will set you back a few hundred bucks!!
That said, there are still some things to consider. I have heard that SS will give you better performance, maybe even add some pitch because it is thinner. Also heard that being heavier it might take more energy to spin, not sure I believe that though. I do believe better performance though, maybe more speed. They can still be damaged though depending on what they hit. If I had the extra cash I might try a SS just to see what it can do. Being SS they would not flex as much as an aluminum one and being thinner they have less resistance in the water. Unfortunately the extra cost is more than the return you get in performance.
- Tomfoolery
- Admiral
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- Location: Rochester, NY '99X BF50 'Tomfoolery'
Re: PROP - Aluminium or Stainless
As well you shouldn't. If it's got more mass, and the same geometry, it's got more rotational inertia, so it will take more energy to increase its speed (which it returns when you decrease its speed). But once it's running at a steady speed, it takes zero additional energy to keep running at that speed, not counting the work it's doing, of course (pushing the boat). It's a flywheel, and a rather puny one at that, even at 2000-2500 rpm.* Maybe a driver can feel that in a high performance racing boat when changing throttle settings, but not in a Mac with an outboard. So the fraction of a second it takes to go from idle to near-full throttle speed isn't going to change in any noticeable way with a heavier prop.Terry wrote:Also heard that being heavier it might take more energy to spin, not sure I believe that though.
*The inertia of a spinning mass through a gear train changes as the square of the ratio, so a prop running at 1/2 the speed of the engine has 1/4 of the inertia reflected to the flywheel of the engine. So the prop inertia is quite puny compared to the flywheel and crank of the engine, and even then, it only matters when changing engine speed, not steady running.
- Russ
- Admiral
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Re: PROP - Aluminium or Stainless
Aluminum props are much cheaper to repair/recondition. I chewed up a few on my runabout. Amazing how they can fix these things.
SS cost MUCH more to repair.
So far on our Mac, I've never damaged a prop.
SS props are also shiny and cool. I'd be curious side by side what performance difference there are.
--Russ
SS cost MUCH more to repair.
So far on our Mac, I've never damaged a prop.
SS props are also shiny and cool. I'd be curious side by side what performance difference there are.
--Russ
- Tomfoolery
- Admiral
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Re: PROP - Aluminium or Stainless
And if your boat lives on a trailer, much more tempting to a thief.RussMT wrote:SS props are also shiny and cool.
- yukonbob
- Admiral
- Posts: 1918
- Joined: Mon Feb 14, 2011 6:54 pm
- Sailboat: Other
- Location: Whitehorse Yukon
Re: PROP - Aluminium or Stainless
If you've dinged your alum prop where you sail that should be something to consider along with the repair costs mentioned above. Hitting objects with the harder ss prop does increase the possibility or damaging your lower leg or even the drive shaft. The softer alum prop will help absorb more of the impact. IMO Id be concentrating more on pitch performance than material performance.
- Russ
- Admiral
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Re: PROP - Aluminium or Stainless
That's an interesting point. The AL prop is somewhat sacrificial isn't it.yukonbob wrote:If you've dinged your alum prop where you sail that should be something to consider along with the repair costs mentioned above. Hitting objects with the harder ss prop does increase the possibility or damaging your lower leg or even the drive shaft. The softer alum prop will help absorb more of the impact. IMO Id be concentrating more on pitch performance than material performance.
However, knock on wood, both my AL props are in perfect condition. Now I've gone and jinxed myself.
--Russ
- Erik Hardtle
- First Officer
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Re: PROP - Aluminium or Stainless
Here is why I will never go to stainless steel:
Rocks vs Prop: Lower unit damage= NONE.
I don't blame the prop... just the capt.
Rocks vs Prop: Lower unit damage= NONE.
I don't blame the prop... just the capt.
- dlandersson
- Admiral
- Posts: 4531
- Joined: Fri Aug 27, 2010 10:00 am
- Sailboat: MacGregor 26X
- Location: Michigan City
Re: PROP - Aluminium or Stainless
I'm looking at 4 bladed props. Is your outboard a 50 HP Merc?
Erik Hardtle wrote:Here is why I will never go to stainless steel:
Rocks vs Prop: Lower unit damage= NONE.
I don't blame the prop... just the capt.
- Jimmyt
- Admiral
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Re: PROP - Aluminium or Stainless
Looks like he was running about 2-3/8 blades... I would guess a slight dip in performance after that mod. Ouch!
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- Chief Steward
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