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Old Sep 09, 2005, 09:18 AM
Maurice
mpodder's Avatar
Bakersfield, Cal.
Joined Jul 2004
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Wingtip shape?

I've got a new S-15 coming from Wowings. I downloaded the instruction off the website, to get ready for the build and noticed that the option was given to leave the tips squared, as the pics of the prototype, or round them like say the Halfpipe.

What do you think?

Maurice
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Old Sep 09, 2005, 11:22 AM
Confirmed Chronic
screamin' eagle's Avatar
Pacific Palisades, CA
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Aerodynamic considerations aside, rounded wingtips look better to my eye, and are less likely to sustain damage.
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Old Sep 09, 2005, 11:25 AM
Ninja of the Nasty
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Joined Jan 2004
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yeah, squared tips will crease on a crash and just be sitting there floppy creating drag i feel anyhow... i like rounded tips..

JOe
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Old Sep 09, 2005, 11:35 AM
Maurice
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Bakersfield, Cal.
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Quote:
Originally Posted by KingOfTheHill
yeah, squared tips will crease on a crash and just be sitting there floppy creating drag i feel anyhow... i like rounded tips..

JOe
Thanks! Then how much of a curved tip? Just enough to take off the point, like a Gulp SR or full elipse like the Half Pipe. Also I've seen some tips that curve the tip of the aileron as will.

What do you think?
Maurice
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Old Sep 09, 2005, 11:45 AM
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Again my unprofessional opinion, but I take off as little as possible because what's left won't have a proper leading edge - it will need to be sanded down to approximate an airfoil shape. The kit will probably come with a template. Rounding the elevon helps a lot with the appearance that the wingtip is rounder than it is. Looks better IMO.
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Old Sep 09, 2005, 12:03 PM
Maurice
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Bakersfield, Cal.
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So more like the Gulp or M60. That's the way I'll go then and I'll probably round the aileron tips as well.

Thanks again
Maurice
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Old Sep 09, 2005, 02:24 PM
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There is a good art. in the Quiet Flyer Sept 2005 about wing platforms and wing tips. might help. If not..Just go and beat on a cowbell and your design will come to you.

Gene
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Old Sep 09, 2005, 05:42 PM
Frigate
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Haiku,Hawaii
Joined Dec 2004
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I rounded the wing tips on my Skua,a bit, and trailing edge a hair.
It cartweels great (:-)
You might want to wick some CA on to the elevon tips.
Dave
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Old Sep 09, 2005, 05:52 PM
Maurice
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Bakersfield, Cal.
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Quote:
Originally Posted by kawika
I rounded the wing tips on my Skua, It cartweels great (:-)


You might want to wick some CA on to the elevon tips.
Dave
Thanks Dave. Any tips on the Skua?

Maurice
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Old Sep 10, 2005, 12:51 AM
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Well, the more you round the better the lift distributions gets but the more you hurt the airfoil accuracy. I think that ala halfpipe is the way to go, since you can get the airfoil "close" by eye and it's ver very accurate when cut from epp as it is.

--Alex
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Last edited by raptor22; Sep 10, 2005 at 01:33 AM.
Old Sep 10, 2005, 01:32 AM
Frigate
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Haiku,Hawaii
Joined Dec 2004
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Maurice-
You are gonna love the way your s-15 flys. I'm really enjoying my Skua.
The instructions are very complete. Just take your time.
One word of caution........If you are going to use thinned goop on the S-15 be careful not to get it in the seam between the wing panels. I was very generous with the thinned goop in front of the cg (I drew a pen mark so I knew where to goop.)The outer wing panels are pre glued with hot glue before they cut the spar slot. Well it seems that the toulene melts hot glue, so my Skua started coming apart at the seams. Once the thinned goop dried I was able to glue everything back together with goop. I would use goop to glue all the foam parts as well as the spar.
When you balance the plane ,use the forward cg measurment Kye gives you to start with.You can then move it back as you get everything dialed in.This is common sense, but I had just built a Moth before building the Skua so I started with the rearward speced cg.(big mistake). Its a little tricky getting everything dialed in just right ,but well worth the effort.
Enjoy-

Dave
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Old Sep 10, 2005, 04:10 PM
Maurice
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Bakersfield, Cal.
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[QUOTE=kawika]Maurice-
You are gonna love the way your s-15 flys.
If you are going to use thinned goop

I'm going to use Worldtex (Rebagged Solortex by Horizon). You can mail order it from Horizon or have your local hobby shop order it.

When you balance the plane ,use the forward cg

I plann on putting the ballast tube. The plans, I downloaded, say to make your CG decision before installing or wait till later and cut every thing back open to install it later. So I need to be on to begin with. Any suggestions?

Here's some pics of the plane on the website and how I plan to change the tips and fins.

Maurice
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Old Sep 11, 2005, 04:44 PM
Frigate
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Haiku,Hawaii
Joined Dec 2004
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mpodder-
I rounded my wing tips about like yours. I did notice that most of the pics of the UK skuas had straight tips. I don't think it matters to much either way.
I used ultracote on mine, but what ever works and is easier to get .
The skua didn't come with a ballast tube, so I don't have any first hand experience with that . I would put the tube between the forward and aft recommended cgs.
As with most wings its usually hard to get the ballast sealed in the wing and covered, (and be spot on)since you don't know how much lead you are gonna need until your done covering. With mine I put several pieces of flat lead sheet in the battery bay as recommended,and also ended up tapeing a bunch more to the bottom of the nose. I didn't want to cut into the nose and weaken the structual integrity.
Don't be shy about emailing Kye with questions,he is a super nice guy and will usually get back to you within 24 hrs. Since this kit is so new, he's the guy who knows the S-15 the best.
Dave
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Old Sep 11, 2005, 06:36 PM
Maurice
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Bakersfield, Cal.
Joined Jul 2004
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Thanks for the response Dave. I'll let you know how it goes and may do a build thread on it when it gets here.

Maurice
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