Propellor Supplier

[R Baker]

Can anyone please tell me who the propellor manufacturer is ?

 

[Osprey]

The propeller on my R27 is made by Acme Propellors. Google them or go to http://www.acmemarine.com

 

[Stevan47]

Hi guys: While we are discussing propellors, can anyone out there tell me what the letter 'V', which is stamped on my propellor, means, which is stamped next to the other numbers and letters? Details stamped on the reverse face of my propellor boss are, reading from left to right and looking at the rear of the propellor boss, from aft'. Details below:

650 (being the unique ACME part #); 13 x 12.125 (diameter and pitch, respectively); 'V' (?); 'R' (right handed rotation); 1" (shaft bore diameter). I have gone onto the ACME website and cannot find any reference to the letter 'V'. Might it mean 'variable' and/or have something to do with propellor torque or thrust?

Anyone, please?

Regards, Stevan

 

[SGIDAVE]

Hi guys: While we are discussing propellors, can anyone out there tell me what the letter 'V', which is stamped on my propellor, means, which is stamped next to the other numbers and letters? Details stamped on the reverse face of my propellor boss are, reading from left to right and looking at the rear of the propellor boss, from aft'. Details below:

650 (being the unique ACME part #); 13 x 12.125 (diameter and pitch, respectively); 'V' (?); 'R' (right handed rotation); 1" (shaft bore diameter). I have gone onto the ACME website and cannot find any reference to the letter 'V'. Might it mean 'variable' and/or have something to do with propellor torque or thrust?

Anyone, please?

Regards, Stevan

Hello Stevan,

Interesting question...it may mean variable in the sense of 'cupped' blade geometry. But certainly not variable in a 'variable pitch' sense. Maybe you could post a pic?

dave

 

[Stevan47]

HI Dave: I will try to attach a photo to this post, but failing that, please check out my album, where you will find some image. Regards

 

[Stevan47]

Hi Dave: I have attached the photos in my gallery. I was unable to successfully attach photos to my post. Have a look and let me know what you think. Regards

 

[fran uteg]

The "V" stands for variable pitch ....... the blades cannot be re-pitched since it is a cast/milled prop but the pitch changes on the blade from about mid-point to the tip. The mid point is coarser than 12.5 then flattens out to less than 12.5 at the tip much like the Sensenich prop on the Taylorcraft . The fine (flatter) pitch at the tip eliminates/reduces cavitation which is caused by higher tip speeds ....... the AVERAGE of the coarser mid-section and the finer tip pitch comes out to 12.5. I run an acme 224 (15.5) on Reflections and have been very pleased with the results. Hope this clears the "V" thing up Fran

 

[SGIDAVE]

Hi guys: While we are discussing propellors, can anyone out there tell me what the letter 'V', which is stamped on my propellor, means, which is stamped next to the other numbers and letters? Details stamped on the reverse face of my propellor boss are, reading from left to right and looking at the rear of the propellor boss, from aft'. Details below:

650 (being the unique ACME part #); 13 x 12.125 (diameter and pitch, respectively); 'V' (?); 'R' (right handed rotation); 1" (shaft bore diameter). I have gone onto the ACME website and cannot find any reference to the letter 'V'. Might it mean 'variable' and/or have something to do with propellor torque or thrust?

Anyone, please?

Regards, Stevan

Here is Stevan's Acme #650 bearing the 'V' designation.

dave

 

[SGIDAVE]

The "V" stands for variable pitch ....... the blades cannot be re-pitched since it is a cast/milled prop but the pitch changes on the blade from about mid-point to the tip. The mid point is coarser than 12.5 then flattens out to less than 12.5 at the tip much like the Sensenich prop on the Taylorcraft . The fine (flatter) pitch at the tip eliminates/reduces cavitation which is caused by higher tip speeds ....... the AVERAGE of the coarser mid-section and the finer tip pitch comes out to 12.5. I run an acme 224 (15.5) on Reflections and have been very please with the results. Hope this clears the "V" thing up Fran

HEllo Fran,

Isn't the English language great. One word can have multiple meanings.

The propellers we use on Ranger tugs are NOT variable but rather FIXED pitch. A "Variable" pitch propeller is one that the user can change the pitch whilst underway (boating, flying, etc.). While pitch may 'vary' across the face of the propeller's blade, the blade itself is FIXED at it's root so thus not variable in the normal sense of usage when talking about propellers. As with bifocal lenses, perhaps a better description is PROGRESSIVE pitch.

Note the plate on the top of your Yanmar 3YM states for use with FIXED PITCH propellers ONLY.

dave

 

[Stevan47]

Hi Fran and Dave: Many thanks for all your great input, and also thanks to Dave for attaching my photos to the post. It all makes sense now. One point though: would I be incorrect by describing the 'V' as actually meaning, 'varying' pitch (albeit in a static sense)?

I also have always understood 'variable' to mean 'able to adjust/change' pitch while underway. Maybe it is just semantics, but at least now I understand what the 'V' signifies.

Your thoughts? Stevan

 

[fran uteg]

Hi Stevan, Dave is correct in that our props are "fixed pitch," as it relates to the entire prop ...... Acme uses the "V" to identify varying pitch within each blade ...... as Dave says, English can be a confusing language ...... if we were to sprechen sie Deutsch we would end up with one word, twenty seven letters long, that describes the prop and all it's characteristics as I described in my post ........ enjoy the "V" ........ Fran 😀

 

[Stevan47]

Ja, Fran, this is great. I really appreciate your feedback. Now I have a little more useful, and interesting information to store in the 'memory banks'. KInd regards