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craiggo View Drop Down
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Joined: 01 Apr 04
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Posts: 1810 		Post Options Post Options   Quote craiggo Quote  Post ReplyReply Direct Link To This Post Topic: Spy photos
    Posted: 09 Jan 08 at 5:01pm
Sorry just read Wes's response to my previous mail and have a comment to make.
From a civil airline point of view, the retro-fitting has to be done very carefully. Extra weight means less range, and range tends to sell aircraft. When retro fitting a winglet the drag reduction benefits increase the available range, but if the wing structure has to be strengthened to deal with the increased wing loading and subsequent bending, then you start losing your range benefit.
The safety factors on the Discus were I assume large enough to allow for the increase wing loading from the winglet.

Anyway well done to Mike, his foils look great, just a shame there wasnt enough wind at Axbridge on New Year to get up on them and show us how fast the Axiom V4 was. I had a pants time in my 700 although I did pass the Musto Skiff who had a 2min headstart on me !!!
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tack'ho View Drop Down
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Posts: 1100 		Post Options Post Options   Quote tack'ho Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jan 08 at 8:47pm

Ouch

just did some online research into winglets, complex is one way of putting it, but in short just build longer wings unless that is structually not feasible in which case add winglets.

NB: adding winglets actually reduces wingtip loadings the increase in weight is purely the weight of the winglet.

NB2: Winglets save fuel and increse range but genrally only in the cruise portion of flight.

NB3: From a physics perspective forget momentum it is really the same thing as inertia.  Remember your Newtonian physics, intertia is the tendency of a body to remain in it's current sate of motion unless acted on by an external force.

NB4: If anybody is actually interested in the physics behind the glider thing PM me, I'll save you the pain of not writing it here!



Edited by tack'ho
I might be sailing it, but it's still sh**e!
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Jack Sparrow View Drop Down
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Posts: 2965 		Post Options Post Options   Quote Jack Sparrow Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 08 at 11:29am
Ummmmm?.....

saw this the other day lurking in a shed.
Farr 3.7 Class Website
Farr 3.7 Building - Facebook Group
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Villan View Drop Down
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Posts: 1768 		Post Options Post Options   Quote Villan Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 08 at 6:17pm
National 12? ( Based on the straight gunnels )
Vareo - 149 "Secrets"
TandyUK Servers
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aardvark_issues View Drop Down
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Joined: 24 Jul 05
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Posts: 505 		Post Options Post Options   Quote aardvark_issues Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 08 at 6:20pm
bit too narrow/shallow for a 12...
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mike ellis View Drop Down
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Posts: 2339 		Post Options Post Options   Quote mike ellis Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 08 at 6:25pm
aren't national tweleves really narrow waterline boats?
600 732, will call it Sticks and Stones when i get round to it.
Also International 14, 1318
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Merlinboy View Drop Down
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Joined: 03 Jul 06
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Posts: 3169 		Post Options Post Options   Quote Merlinboy Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 08 at 6:26pm
Looks like a cherub to me ???
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tgruitt View Drop Down
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Posts: 2479 		Post Options Post Options   Quote tgruitt Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 08 at 6:30pm
Originally posted by aardvark_issues

bit too narrow/shallow for a 12...


Def not an N12, must be a Cherub surely?
Needs to sail more...
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andy_cherub View Drop Down
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Posts: 768 		Post Options Post Options   Quote andy_cherub Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 08 at 7:14pm

Cherub, 14, or SK5 perhaps?

Where was the work shop?
-12ft skiff, Team 'CST Composites'
-Many thanks goes out to all of my sponsors.
Ignore my user name, my views are of a 12ft skiff
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timnoyce View Drop Down
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Posts: 1991 		Post Options Post Options   Quote timnoyce Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 08 at 7:46pm
SK5?! you're jumping the gun a bit there Andy. It's an SK4 
BEARFOOT DESIGN
Cherub 2648 - Comfortably Numb
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