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Old 20 September 2006, 05:10   #1
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Infinitely Variable pitch surface drive

Saw this on the Southampton Boat Show programme last night fitted to a rib.

They showed film of the rib pirouetting on the spot and being berthed sideways. Who makes it? looked like an Avon or a Humber but the film was taken from a pc and quite low res. I was rather impressed.


It's not another one of Turbodiesel's toys is it?
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Old 20 September 2006, 08:44   #2
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Not one of these was it?

http://www.q-spd.com/models.htm

They were at the 2004 show exhibited by Bruntons

http://www.bruntons-propellers.com/news/
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Old 20 September 2006, 14:37   #3
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If it was the one that I'm thinking of it's not actually a surface drive, but it is fully variable.

The one I saw at the show is fitted as a pair of drive units, even on a single engine installation, and uses hydraulics to change the blade pitch controlled by some very clever electronics. As the pitch of each blade is controlled separately you can get some very cool manouevering!

They reckoned on going into production sometime next year, with prices comparable to an outdrive (although I have my doubts about that). Can't for the life of me remember the name of the company but I'll try to find out.

John
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Old 20 September 2006, 16:34   #4
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Actually I was wrong, it is a surface drive . . .

It's the Yellowfin VSD www.yellowfin.com (thanks to a well known speedboat captain for the reminder!)

Definitely one to watch with interest

John

PS Videos of it in action here: http://www.yellowfin.com/corp_vsd_in_action.html
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Old 20 September 2006, 17:56   #5
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That's the one. Cheers John.
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Old 22 September 2006, 05:23   #6
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Very clever

Had a look at this system about 18 months ago. Was top secret then. Looks very clever and should be very efficient as there are no components causing drag - no rudders even!
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Old 22 September 2006, 08:53   #7
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The Rib is a Valiant ST-PT 650.
Petter
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Old 22 September 2006, 11:33   #8
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Does look like it has great potential - would love to see some pics of it. I bet they will take the development so far and then sell out to a bigger company.
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Old 22 September 2006, 15:55   #9
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Quote:
Originally Posted by Petter
The Rib is a Valiant ST-PT 650.
Which RIB? The one in the videos is a Ribcraft.

John
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Old 22 September 2006, 15:58   #10
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Quote:
Originally Posted by codprawn
Does look like it has great potential - would love to see some pics of it.
It's a very impressive piece of engineering. Rather a lot to go wrong if they don't get it right though (not to mention the 4 squillion lines of code that it needs to run it!).

I hope they do well though. I really want to have a go on one!

John
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