Saildrive: Difference between revisions
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[[Image:Saildrive-2.jpg|thumb|Saildrive of [[Volvo Penta]] | [[Image:Saildrive-2.jpg|thumb|Saildrive of [[Volvo Penta|a Volvo Penta]]]] | ||
A '''saildrive''' is a transmission system for a boat whose inboard engine has a horizontal output shaft. The saildrive's input shaft is therefore also horizontal. That input shaft is geared so as to drive a vertical intermediate shaft extending downward through the hull. The intermediate shaft is then geared so as to drive a horizontal propeller shaft mounted on a [[skeg]] outside the hull. | A '''saildrive''' is a [[Transmission (mechanical device)|transmission]] system for a boat whose inboard engine has a horizontal output shaft. The saildrive's input shaft is therefore also horizontal. That input shaft is geared so as to drive a vertical intermediate shaft extending downward through the hull. The intermediate shaft is then geared so as to drive a horizontal propeller shaft mounted on a [[skeg]] outside the hull. | ||
The transitions from horizontal to vertical and then back to horizontal can be seen as a Z shape, and saildrives are indeed similar to the [[Z-drive]] transmissions used on larger vessels. The difference between a saildrive and a Z-drive is that a saildrive's propeller shaft is fixed in place, pointing aft, whereas a Z-drive's propeller shaft can be rotated to any azimuth. | The transitions from horizontal to vertical and then back to horizontal can be seen as a Z shape, and saildrives are indeed similar to the [[Z-drive]] transmissions used on larger vessels. The difference between a saildrive and a Z-drive is that a saildrive's propeller shaft is fixed in place, pointing aft, whereas a Z-drive's propeller shaft can be rotated to any azimuth. | ||
Traditional sailboat transmissions consist of a simple horizontal output shaft extended rearward from the engine, through the stern via a [[stuffing box]]. The saildrive has several advantages over the traditional sailboat transmission: smaller horizontal size, no stuffing box to maintain, and the propeller is mounted horizontally instead of at a downward angle. | Traditional [[sailboat]] transmissions consist of a simple horizontal output shaft extended rearward from the engine, through the stern via a [[stuffing box]]. The saildrive has several advantages over the traditional sailboat transmission: smaller horizontal size, no stuffing box to maintain, and the propeller is mounted horizontally instead of at a downward angle. | ||
Saildrive also reduces [[propeller walk]], reduces vibration, and is more efficient.<ref>{{cite web |url=http://www.boats.com/reviews/all-about-saildrives/ |title=All About Saildrives |last1=Sherman |first1=Ed |last2= |first2= |date= |website=www.boats.com |publisher= |access-date=15 March 2016 |quote=}}</ref> | Saildrive also reduces [[propeller walk]], reduces vibration, and is more efficient.<ref>{{cite web |url=http://www.boats.com/reviews/all-about-saildrives/ |title=All About Saildrives |last1=Sherman |first1=Ed |last2= |first2= |date= |website=www.boats.com |publisher= |access-date=15 March 2016 |quote=}}</ref> | ||
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==History of the saildrive== | ==History of the saildrive== | ||
Among the earliest representatives of the technology was the OMC Zephyr Saildrive, produced from 1977 to 1984. This was a two-stroke gasoline engine to which oil needed to be added on a 50:1 mixture. It was a derated version of the 32 cubic inch engine block used at that time on the OMC Evinrude 25/30/35 hp outboards. | Among the earliest representatives of the technology was the OMC Zephyr Saildrive, produced from 1977 to 1984. This was a two-stroke gasoline engine to which oil needed to be added on a 50:1 mixture. It was a derated version of the 32 cubic inch [[engine block]] used at that time on the OMC Evinrude 25/30/35 hp outboards. | ||
== See also == | == See also == | ||
Latest revision as of 18:01, 13 October 2025
Template:Short description Template:Refimprove
A saildrive is a transmission system for a boat whose inboard engine has a horizontal output shaft. The saildrive's input shaft is therefore also horizontal. That input shaft is geared so as to drive a vertical intermediate shaft extending downward through the hull. The intermediate shaft is then geared so as to drive a horizontal propeller shaft mounted on a skeg outside the hull.
The transitions from horizontal to vertical and then back to horizontal can be seen as a Z shape, and saildrives are indeed similar to the Z-drive transmissions used on larger vessels. The difference between a saildrive and a Z-drive is that a saildrive's propeller shaft is fixed in place, pointing aft, whereas a Z-drive's propeller shaft can be rotated to any azimuth.
Traditional sailboat transmissions consist of a simple horizontal output shaft extended rearward from the engine, through the stern via a stuffing box. The saildrive has several advantages over the traditional sailboat transmission: smaller horizontal size, no stuffing box to maintain, and the propeller is mounted horizontally instead of at a downward angle.
Saildrive also reduces propeller walk, reduces vibration, and is more efficient.[1]
History of the saildrive
Among the earliest representatives of the technology was the OMC Zephyr Saildrive, produced from 1977 to 1984. This was a two-stroke gasoline engine to which oil needed to be added on a 50:1 mixture. It was a derated version of the 32 cubic inch engine block used at that time on the OMC Evinrude 25/30/35 hp outboards.
See also
References
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