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| S&S Swan Maintenance - Propeller |
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Join Date: 21 May 2007
Posts: 73 |
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Propeller |
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Join Date: 21 May 2007
Posts: 73 |
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Good morning, did anyone of you uses the "AUTOPROP" propeller? I need some help on understanding if his kind of propeller installed on my 48' could create any problem with he gearbox Thanks Sergio Clarion of Skye 042/48 ..............or do anyone has the ZF/15 hurt/ZF gearbox? if the answer is yes which propeller do you use with this gearbox? any problems ?
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Join Date: 02 January 2008
Posts: 1547 |
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Dear Sergio Pls clarify your concern - does somebody propose that the propeller caused problems with the gearbox? I can think of two possibilities - the propeller is overloading the engine including gearbox, or there is excessive vibration in the installation. In the first case a number of rpm and speed readings taken in the mostly used cruising range would give and indication, in the second case it needs to be verified where the reason is, could also be elsewhere. Kind regards Lars |
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Join Date: 21 May 2007
Posts: 73 |
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Dear Lars,
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Join Date: 02 January 2008
Posts: 1547 |
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Dear Sergio Thank you for the information The new engine has the same top rpm as the old, but are the new and old gearbox reduction ratios also the same? If not, the propeller rpm is different, and this affects its power requirement. Referring to the disk problem, it is suggested that you check that you for sure use the correct oil in the ZF gearbox, otherwise the result may be burned disks. I would not think a gearbox problem restricted the rpm to 2000, it should then have heated up quickly, and destroyed. Maybe caused by the fuel supply, or if there was black exhaust smoke the propeller for some reason became very heavy, fouled blades? As mentioned above, a number of rpm/speed readings would be helpful for evaluating the propeller performance, as it does not have a fixed pitch. The rpm/speed at full throttle should be included. Kind regards Lars |
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Join Date: 21 May 2007
Posts: 73 |
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Dear Lars,
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Join Date: 02 January 2008
Posts: 1547 |
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Dear Sergio The rpm/speeds you report are within the range that can be expected. It can be remarked that the propeller is too heavy for the engine as the full throttle rpm is 300 rpm below the nominal maximum. Has the engine supplier commented on this? Presumably it has been checked whether the gearbox power rating is too low for this engine - this comes to mind if the gearbox needs to be rebuilt every 200 hours Kind regards Lars |
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Join Date: 21 May 2007
Posts: 73 |
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Dear lars,
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Join Date: 21 May 2007
Posts: 73 |
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After having discussed with all parties involved it seems that the problem is in the gearbox which could not be strong enough for a 16 tons boat . If you add the fact that autoprop is a "heavy" propeller the only solutions seems to replace the ZF 15 gearbox with ZF 25 + a propeller shaft brake which it is always better to have with autoprop. I'll go on with this and keep you updated if anything new.
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