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Old 30-08-2007, 04:46 PM   #1
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surface-piercing propulsion

Anyone interested in a new surface-piercing propulsion system?
It's simple, cheap and easy to install but your hull needs some minor modification to the running surface

http://www.stormfagel.se/eng/

Oh, forgot to introduce myself. I'm Olli from Germany, new to this Forum and with tons of questions on some hulls and manufacturers in my bag. But I'm not just taking, I'm also willing to deliver videos and pix. They don't have the quality of the Shots in the gallery, then again they are not that bad. Just don't know how yet 'cause I have not invented the computer.
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Old 30-08-2007, 04:56 PM   #2
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Hello,Yes I am intrested in a surface drive ,I looked at your link but could not find a pic or any info about the drive .

Can you post a pic or two from the drive ?

thx sterling
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Old 30-08-2007, 06:43 PM   #3
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Sorry!!!

Here he comes:
http://www.stormfagel.se/galleri/71.jpg
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Old 30-08-2007, 06:57 PM   #4
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Looks very similar to this product:

http://www.yellowfin.com
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Old 30-08-2007, 07:22 PM   #5
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Yeah. The Yellowfin Drive can even adjust the rake. Impressive! Would like to see some of the RHIBs they bolted them on.
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Old 30-08-2007, 10:59 PM   #6
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Boat seems to have very little bow lift, from the videos there seems to be a lot of wetted surface. Speed looks low for the style of boat no rooster tail familiar with surface drives.
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Old 31-08-2007, 12:24 AM   #7
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FWIW I reckon directing the exhaust through the prop hub instead of that cone affair would improve efficiency.
Also feel that the hull is to different (unproven?) to accurately assess performance of the drive system alone.
Also (II), the torques must be monstrous. Typical prop speeds on a 14-16" prop are about 3K rpm. On prop diameter that size could see rpm dropping to half that to keep tip speeds under control, therefore gobs and gobs of torque.
Also (III) interesting is the rear flow control fin. Conventional wisdom puts the prop in as clean, undisturbed flow of water as possible to maximise efficiency (think Volvo leading prop jobbie). That fin in front will be creating some turbulence, reducing efficiency.
Finally, in the clips the props are at best only just breaking the surface of the water - in reality they are running as virtually fully submerged. Hence no rooster tail.
Bet slip is low though.

Just some humble thoughts from an enthusiast.
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Old 31-08-2007, 10:01 AM   #8
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I love the manouverability of the boat in the yellofin video.
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Old 31-08-2007, 01:16 PM   #9
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my boat's prop's piercing the surface at the moment. Only because it's broken though!
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Old 31-08-2007, 01:26 PM   #10
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You wanna get that into prop revs!.......now where's that prop spanner?

That looks nearly as big as the one MrRob has on his Seaquel!

BTW, I've been dying to ask, how did Chaos break it to you that he'd sunk your 24?
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Old 31-08-2007, 01:45 PM   #11
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Here's the spanner
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Old 31-08-2007, 01:46 PM   #12
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Quote:
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Here's the spanner
Does that one float, like those yella merc ones??
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Old 31-08-2007, 01:58 PM   #13
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Yes. it's just the ship that does't!
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Old 31-08-2007, 02:02 PM   #14
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I think they had military use in mind when they created the Storfageln boat.
The exhaust fumes come out beneath the hull in four rows of vents possibly not only to reduce wetted surface but also to make a bad target for temperature-guided missiles. The rear flow control fins keep the water flow to the props clear from those fumes I suppose.
I don’t know if the large overhang or transom notch ( or whatever you call it in English) is enough to keep the rooster tail down or if the propeller is the reason for that. Anyway it has no rooster tail you could spot on radar.
On the videos the performance is not that good for the power but how fast would you go with your buddies crawling all over the deck?

Yust some thoughts. I'm not a naval architect.
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Old 31-08-2007, 04:00 PM   #15
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Quote:
Originally Posted by olli View Post
how fast would you go with your buddies crawling all over the deck?
As fast as it would go, they would just have to hang on.
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Old 31-08-2007, 05:01 PM   #16
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If your avatar shows your boat your friends die young I guess
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Old 31-08-2007, 05:35 PM   #17
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I have had two people fall out of a Picton boat, we hit a ferry wave flat out landed, looked round they were GONE! Broke steering, windscreen and bent the prop I did however find them, long time ago now.
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