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Old 22-01-2012, 13:21   #1
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Velvet Drive

Hello , probably my question look stupid but please I need help .
Have boat with two engine man-bussing 145 H/P each. Both eng. rotation's
CCW , if observer stay behind engine's .
Have two velvet AS 7-71 C ( opposite )
Wish , that port engine and drive rotation by left hand , stern - right hand.
if observer stay behind prop.

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Old 22-01-2012, 13:42   #2
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Re: velvet drive

Both your engines rotate left hand now and you want port propeller to be left hand rotation and starboard propeller to be right hand rotation. Is that correct?
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Old 23-01-2012, 11:15   #3
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Re: Velvet Drive

Hello , You are right . I wish , that one velvet drive 1.91:1 rotation normaly , so opposite ,one (port ) rotation how engine - CCW
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Old 23-01-2012, 11:46   #4
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Re: Velvet Drive

http://www.kp44.org/ftp/VelvetDriveI...tionManual.pdf

Kaban: The link above explains the install of the Velvet Dr and how to set up for rotation. Essentially, there is a pump plate that can be mounted to the main housing in 2 positions, corresponding to the CW or CCW rotation of the output shaft. This pump plate has arrows showing the direction of rotation. Mounting the pump plate (with the arrow in the direction you want to go at the top) is all you have to do.
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Old 24-01-2012, 05:35   #5
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Re: Velvet Drive

Greetings and welcome aboard the CF, Kaban.
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Old 24-01-2012, 07:20   #6
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Re: Velvet Drive

Thank You , but my question how modify velvet drive 1.91:1 , normaly it is opposite rotation , I nedd that imput shaft rotat.CCW and output CCW .
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Old 24-01-2012, 08:25   #7
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Re: Velvet Drive

Sorry, but most Velvet Drives only rotate the direction the engine turns. The hydraulic pump on the front of the VD is adjustable for the engine turning direction so it will pump. This does not change shaft rotation.

With the exception of the Velvet Drive CR-2, which is no longer in production, otherwise RH in - RH out, LH in - LH out.

To have opposite turning props you need a LH turning engine on the port side of your boat and a RH turning engine for the starboard. You may wish to refer to www.marinegears.com.


Tom
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Old 24-01-2012, 13:01   #8
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Re: Velvet Drive

If I'm understanding correctly there are a few ways to do this and none are easy or inexpensive. You can remount the engine with the rear facing forward and drive the gearbox with the nose shaft, often an imposibility. Install a crankshaft reversing timing cover that employs gears instead of a timing chain. Install a reversed camshaft, starter and waterpump and run the engine "clockwise looking forward". Or do what is more common recently, run one gearbox in reverse. I much prefer the older method of reversing the crankshaft rotation but this requires a $pecial adaptor plate and cover with core$ponding gear$. This could be acomplished with the engine in place. Of course the starter and velvet drive pump must be reversed for it to work.
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