How about some input on the differance between Campbell Sailer and Michigan wheel props. I am going to change out my 2 blade for a 3 blade prop and sure would like some Expert advise before spending $ 350-$ 400 I own a 1981 Hunter 33 foot with 15 hp Yanmar 2QM15 and turning a 2 blade 14X12X 1 inch at this time..
- Status
- Not open for further replies.
D
David Green
3 vs 2
I switched last summer and I am happy with the results. I seem to get more thrust in choppy/sloppy water now than with the two blade. I get same top speed at lower RPM. I don't race so what ever the extra drag is, it just doesn't matter to me.
I switched last summer and I am happy with the results. I seem to get more thrust in choppy/sloppy water now than with the two blade. I get same top speed at lower RPM. I don't race so what ever the extra drag is, it just doesn't matter to me.
K
Kevin L. Woody
Two fixed blade props.
Dear Duane Nifong: Thank you for your note. The Campbell sailor is a very narrow surfaced propeller that utilizes cupping to the trailing edge of each blade. The narrow presented face of the blade creates less drag then possibly the type “E” blade of the Michigan Sailor you currently have. The cupped trailing edge of the Campbell prop causes the water to enter the blade at “X” pitch and leave the propeller at “Y” pitch. This difference between the leading edge pitch and trailing edge pitch is a true variable pitch. This difference accelerates the water off the trailing edge possibly increasing the propellers efficiency. This process has been used on IO props for years. There is now a new process which is being used on propellers like yours which has shown some good results and that’s to add “TIPS” to each end of each blade. This process can be done to any propeller. It’s purpose is to hold the water on the blade longer minimizing the spillage of fluids and energy off the face of each blade. The company, which I know is doing a great deal of work with this process, is Killian propeller in Alameda CA. Their phone number is 510 614 0596. I believe the cost of this procedure is far less then the Campbell prop, but the change may get you close to what, if any, the Campbell may do. Hope this helps. Sincerely, Kevin L. Woody
Dear Duane Nifong: Thank you for your note. The Campbell sailor is a very narrow surfaced propeller that utilizes cupping to the trailing edge of each blade. The narrow presented face of the blade creates less drag then possibly the type “E” blade of the Michigan Sailor you currently have. The cupped trailing edge of the Campbell prop causes the water to enter the blade at “X” pitch and leave the propeller at “Y” pitch. This difference between the leading edge pitch and trailing edge pitch is a true variable pitch. This difference accelerates the water off the trailing edge possibly increasing the propellers efficiency. This process has been used on IO props for years. There is now a new process which is being used on propellers like yours which has shown some good results and that’s to add “TIPS” to each end of each blade. This process can be done to any propeller. It’s purpose is to hold the water on the blade longer minimizing the spillage of fluids and energy off the face of each blade. The company, which I know is doing a great deal of work with this process, is Killian propeller in Alameda CA. Their phone number is 510 614 0596. I believe the cost of this procedure is far less then the Campbell prop, but the change may get you close to what, if any, the Campbell may do. Hope this helps. Sincerely, Kevin L. Woody
E
Ernie Rodriguez
Also Looking
I am also looking for a change in propeller. Hopefully I will find one that gives much better performance than I currently have. Unfortunately I have not seen any comparison of propeller designs in order to make a choice. Re-powering to a bigger engine is one option, but not a practical one. I would rather find a more efficient propeller and stay with the same enginen in my case a Yanmar 3GMD. I have heard claims of higher efficiency with the Campbell Sailer and others, but no real hard data for comparison. Using data presented in Dave Gerr's "Propeller Handbook" on propellers, I find that the current three blade propeller I have would yield an efficiency of 43%, and that is a sizeable difference than the 55% efficiency used as a guide for sizing the required shaft horsepower for a given displacement and speed. Autoprop has published data results comparing performance of the Autoprop, a fixed three blade prop, a fixed two blade prop, a feathering prop and a folding prop. I would like to see new data on the available choices, like the Campbell Sailer, the MAX prop and others not discussed but available. If anyone can shed some light in that direction, sure would be thankful. Thanks, Ernie
I am also looking for a change in propeller. Hopefully I will find one that gives much better performance than I currently have. Unfortunately I have not seen any comparison of propeller designs in order to make a choice. Re-powering to a bigger engine is one option, but not a practical one. I would rather find a more efficient propeller and stay with the same enginen in my case a Yanmar 3GMD. I have heard claims of higher efficiency with the Campbell Sailer and others, but no real hard data for comparison. Using data presented in Dave Gerr's "Propeller Handbook" on propellers, I find that the current three blade propeller I have would yield an efficiency of 43%, and that is a sizeable difference than the 55% efficiency used as a guide for sizing the required shaft horsepower for a given displacement and speed. Autoprop has published data results comparing performance of the Autoprop, a fixed three blade prop, a fixed two blade prop, a feathering prop and a folding prop. I would like to see new data on the available choices, like the Campbell Sailer, the MAX prop and others not discussed but available. If anyone can shed some light in that direction, sure would be thankful. Thanks, Ernie
J
jamie
props
I remember a articaL published in practical sailor that did a fairly extensive review on the campbell prop, it was done by a university in the u.s al in all the artical and paractical sailor speak very higly about the prop,also they are made by mr.campbell just down the street here in nanaimo b,cI have saild on many boats with them and they really work well and have very little drag (by design) and lots of thrust in reverse
I remember a articaL published in practical sailor that did a fairly extensive review on the campbell prop, it was done by a university in the u.s al in all the artical and paractical sailor speak very higly about the prop,also they are made by mr.campbell just down the street here in nanaimo b,cI have saild on many boats with them and they really work well and have very little drag (by design) and lots of thrust in reverse
E
Ernie Rodriguez
M.I.T. Propeller Test
Jamie: I presume the article you refer to in the Jan.1 1995 issue of Practical Sailor is entitled M.I.T. Propeller Test-Round 2, wherein they report test results on the Campbell sailor and others. They also reported on an earlier issue, October 1, 1993, on other propellers. In both cases the testing was performed at M.I.T. by the same graduate students. The propeller size used in the test was 13 inch diameter and 10 inch pitch.
Jamie: I presume the article you refer to in the Jan.1 1995 issue of Practical Sailor is entitled M.I.T. Propeller Test-Round 2, wherein they report test results on the Campbell sailor and others. They also reported on an earlier issue, October 1, 1993, on other propellers. In both cases the testing was performed at M.I.T. by the same graduate students. The propeller size used in the test was 13 inch diameter and 10 inch pitch.
- Status
- Not open for further replies.