debenboy
Full Member
Posts: 46
Country: UK
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Post by debenboy on Jan 1, 2015 16:22:43 GMT
I have a 2 blade Flexofold folder on my SO36i with the Yanmar 3YM30 which hits max revs and with a clean prop and bottom will just exceed 8 kts. Perfectly matched.
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Post by J349er on Jan 1, 2015 17:27:19 GMT
J349r The gearbox on the 39ds does not allow the leaver move from reverse to neutral unless the engine is running Good to know. Thanks.
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Post by captbillh on Jan 1, 2015 17:57:36 GMT
I am selling a 3 blade KiwiProp that was fitted to a Beneteau 373 with a 30 mm shaft to a Yanmar 3JH4E. I traded it in for a Jeanneau 409 with a sail drive. I lost almost a knot under power but gained almost a knot in sailing speed.
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Post by ianqv on Jan 3, 2015 14:14:36 GMT
Hi All, I am just preparing a new thread on this subject as it is something I have been looking into for some time. I have an S/O 37 with a Volvo penta 2040 (40hp). My prop shaft is 25mm in Diameter, and on the ed of that we swing a 17 inch, 3 blade, feathering variprop (which weighs approx 10kg!!). Needless to say the prop works very well, esp in a bit of a seaway. However, because the prop is so heavy, and because we have the higher output engine, and because we only have a 25mm shaft.... this causes us a problem with the cutlass bearing. Calculations show that the boat should be fitted with a 30mm shaft (with the set up we have). The ridiculous Jeanneau "rubber top hat" cutlass bearing is not fit for purpose not matter what set up you have! If you are going to increase the weight of your prop, you "could" run into some problems if everything else stacks up against you. We think we have finally sorted our issue by fitted a sigma flexible coupling between the prop and gearbox, and we have had a made to measure cutlass bearing made. The new cutlass bearing is 2 and a half times the length of the P bracket. This will give the shaft more surface area to run on with the heavy prop. Pics to follow once its all installed. I hope this helps Ian p.s we replaced our engine mounts as a precaution as well..... mmmmm that was a nice job!!
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Post by J349er on Jan 5, 2015 13:09:02 GMT
40HP on a 37'! you must be flying under engine alone...
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Post by On y va on Jan 5, 2015 16:24:40 GMT
Hi All, I am just preparing a new thread on this subject as it is something I have been looking into for some time. I have an S/O 37 with a Volvo penta 2040 (40hp). My prop shaft is 25mm in Diameter, and on the ed of that we swing a 17 inch, 3 blade, feathering variprop (which weighs approx 10kg!!). Needless to say the prop works very well, esp in a bit of a seaway. However, because the prop is so heavy, and because we have the higher output engine, and because we only have a 25mm shaft.... this causes us a problem with the cutlass bearing. Calculations show that the boat should be fitted with a 30mm shaft (with the set up we have). The ridiculous Jeanneau "rubber top hat" cutlass bearing is not fit for purpose not matter what set up you have! If you are going to increase the weight of your prop, you "could" run into some problems if everything else stacks up against you. We think we have finally sorted our issue by fitted a sigma flexible coupling between the prop and gearbox, and we have had a made to measure cutlass bearing made. The new cutlass bearing is 2 and a half times the length of the P bracket. This will give the shaft more surface area to run on with the heavy prop. Pics to follow once its all installed. I hope this helps Ian p.s we replaced our engine mounts as a precaution as well..... mmmmm that was a nice job!! Yes Ian, somewhat strange that the SO37 with this engine doesn´t have a 30mm shaft, as the SO40 with the same engine does have the 30mm shaft. I have the 56HP Yanmar and sometimes wonder if a 35mm shaft wouldn´t have been better, as I have to change the cutless bearing every other year too. It is very true what you say about these heavy props, with sometimes huge centre hubs. In that respect there is a lot to say for the Featherstream prop by Darglow Engineering, as this prop has been designed so the blades are actually in the middle of the hub, not at the end like on all other folding or feathering props. Especially on saildrives, this can cause issues (I know from experience).
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Post by ianqv on Jan 5, 2015 20:10:50 GMT
40HP on a 37'! you must be flying under engine alone... It's even better when it gets lumpy out there! keeps you pushing along! Ian
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Post by ianqv on Jan 5, 2015 20:13:36 GMT
Well if you change can I have your 30mm shaft and p bracket!!! Hi All, I am just preparing a new thread on this subject as it is something I have been looking into for some time. I have an S/O 37 with a Volvo penta 2040 (40hp). My prop shaft is 25mm in Diameter, and on the ed of that we swing a 17 inch, 3 blade, feathering variprop (which weighs approx 10kg!!). Needless to say the prop works very well, esp in a bit of a seaway. However, because the prop is so heavy, and because we have the higher output engine, and because we only have a 25mm shaft.... this causes us a problem with the cutlass bearing. Calculations show that the boat should be fitted with a 30mm shaft (with the set up we have). The ridiculous Jeanneau "rubber top hat" cutlass bearing is not fit for purpose not matter what set up you have! If you are going to increase the weight of your prop, you "could" run into some problems if everything else stacks up against you. We think we have finally sorted our issue by fitted a sigma flexible coupling between the prop and gearbox, and we have had a made to measure cutlass bearing made. The new cutlass bearing is 2 and a half times the length of the P bracket. This will give the shaft more surface area to run on with the heavy prop. Pics to follow once its all installed. I hope this helps Ian p.s we replaced our engine mounts as a precaution as well..... mmmmm that was a nice job!! Yes Ian, somewhat strange that the SO37 with this engine doesn´t have a 30mm shaft, as the SO40 with the same engine does have the 30mm shaft. I have the 56HP Yanmar and sometimes wonder if a 35mm shaft wouldn´t have been better, as I have to change the cutless bearing every other year too. It is very true what you say about these heavy props, with sometimes huge centre hubs. In that respect there is a lot to say for the Featherstream prop by Darglow Engineering, as this prop has been designed so the blades are actually in the middle of the hub, not at the end like on all other folding or feathering props. Especially on saildrives, this can cause issues (I know from experience).
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Post by ianqv on Jan 11, 2015 16:02:16 GMT
Dear All, Here you go..... the "mother ship" of cutlass bearings Supplied by H4 Marine Regards Ian
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Post by natereid on Apr 19, 2015 2:41:31 GMT
I am selling a 3 blade KiwiProp that was fitted to a Beneteau 373 with a 30 mm shaft to a Yanmar 3JH4E. I traded it in for a Jeanneau 409 with a sail drive. I lost almost a knot under power but gained almost a knot in sailing speed. Captbillh, do you still have the kiwi prop available?
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