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Old Apr 01, 2012, 11:03 AM
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Hi all. Can anyone provide detail of the skirt for the SRN6. Im looking in the main for info on the fixing arrangments and also the detail of how to effectivley produce a skirt with fingers, pictures would be a great help. Many Thanks
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Old Apr 01, 2012, 12:08 PM
Barefeet
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Johannesburg
Joined Jul 2006
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I just used mark porters templates and it works great. Haven't tried the fingers but am starting to think about it. And yes, dunno why so few people build hovercraft. They are so satisfying to build and irk well.
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Old Apr 01, 2012, 12:09 PM
Barefeet
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Irk should be work
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Old Apr 01, 2012, 02:22 PM
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Farnham Common, UK
Joined Oct 2009
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100% scale templates for the SR.N6 skirt are available on Mark Porter's web site:
http://www.model-hovercraft.com/srn5/srn5plan.html.
The two photos below show how another builder has attached them using glue for the outside fixing and duvet cover poppers for the inside. Double sided tape would be an alternative for the outside. I hope this helps.
Jeremy
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Old Apr 01, 2012, 02:43 PM
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Thanks for the reply. two questions. one why is there a hole in the base below the lift fan, my understanding is that the air flows out of the sides, along the side ribs and then down into the skirt ?. Second do the seals between the inner and outer edge need to be air tight so all the air from the lift fan goes into the skirt ?
Many thanks
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Old Apr 01, 2012, 04:28 PM
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As I understand it, most of the air is directed under the craft into the area surrounded by the skirt and the pressure created is what provides the lift. The lesser part of the air is directed into the skirt through the slots in the duct which are visible in the photo. The inflated skirt provides the barrier to prevent the pressurised air escaping from under the craft - it does not provide the lift. The skirt does not have to be completely airtight so long as more air enters it than escapes from it. If this explanation is incorrect, would someone please correct me. This is my first hovercraft and I am no expert!

Jeremy
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Old Apr 02, 2012, 07:39 AM
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Hello all. Can anyone point me in the direction of a plan for a lift fan. I would like to make my own rather than buy an aircraft prop. This is the sort of fan im looking to produce. Many Thanks
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Old Apr 02, 2012, 11:42 AM
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Farnham Common, UK
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Hi Pitpup

Chris Curry has used an impeller with his SR.N6 so might have some plans for this. Thinking again about my answer to the question about the hole in the base, might this only be where an aircraft propellor is used? Looking at Chris' impeller, the base of it seems to be solid, so maybe the airflow is different, although I would have thought that you still have to build up pressure under the craft to provide lift. I will be interested to know what you find out. If you are getting on with your build, I hope you will upload some photos.

Progress on mine is slow but steady. I have completed the cabin front windows and completed the perimeter frame on one side. The next step will be to install the decking and cabin roof, both in 0.4mm ply.
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Old Apr 02, 2012, 02:06 PM
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Srn6

the idea of using the fan is the same as what the full size does see http://www.flightglobal.com/airspace...way-13944.aspx but getting an off the shelf prop is easier to do
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Old Apr 02, 2012, 02:31 PM
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Hi Pitpup.

I'm afraid I gave you a bum steer . With a centrigual fan, you do not need a hole.

Jeremy
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Old Apr 03, 2012, 03:18 AM
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My Progress to date

Just a few pics of my progress to date.
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Old Apr 03, 2012, 03:18 AM
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where did you find the fan photos Pitpup?
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Old Apr 03, 2012, 10:59 AM
Barefeet
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Johannesburg
Joined Jul 2006
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I have a few. Made from 2mm ply and shaped balsa blades. Made the blades 25mm long so that the fan plus motor will fit into the available space. It's 140mm diameter with a 100mm hole in the centre. Used the centre cutout to reinforce the bottom plate. Skirt attached with contact adhesive.
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Old Apr 03, 2012, 11:04 AM
Barefeet
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Johannesburg
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Looks like my fan pic is too big. This should be OK. You can see the custom made blade alignment tool that's on it's second fan
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Old Apr 03, 2012, 11:14 AM
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Chris, do you intend fitting fingers to your skirt ???
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