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Wing Fairing Detail - 6/14/2003 9:01:11 AM   
flianbrian



Posts: 329
Joined: 3/21/2002
From: Suthrun, IL, USA
Status: offline 		I have plans for a pattern plane that include building a wing fairing with 1/32" ply against the wing, and faired in with balsa. A top view of the fairing outline is shown, as well as a cross section at one former.

I understand how this would look along the chord, but I can't quite picture how the front part of the fairing is built. The ply extends slightly forward of the LE. Do I fill in under/behind the ply at the LE also??

thanks......
flianbrian

P.S, --- pictures/drawings would be nice!

< Message edited by flianbrian -- Jun 14 2003 4:15AM >
       Post #: 1

Fairings on non-scale planes - 6/14/2003 11:48:24 AM   
Mike James



Posts: 2464
Joined: 1/19/2002
From: Anchorage, AK, USA
Status: offline 		If it was scale, I'd duplicate what was on the original. But for your typical sport/pattern plane with removable wings, I'd do it like the image attached. It looks a little better, without preventing the wings from being removed easily.

(Excuse the clunky drawing... I did it in a hurry.)

Attachments
Click to see fullsize image.
Click for fullsize



_____________________________

Mike James
RC Design and Building - www.nextcraft.com

(in reply to flianbrian)
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Wing Fairing Detail - 6/14/2003 9:39:21 PM   
flianbrian



Posts: 329
Joined: 3/21/2002
From: Suthrun, IL, USA
Status: offline 		Thanks Mike, that helps a bit.

Here's my own clunky bitmap of what it kinda-sorta looks like. It's the placement of the ply flowing beyond the LE that confuses me. As drawn, the outline of the ply doesn't blend into the wing, which is why I thought blocking behind/under the ply would be needed. Forgive me if my question sounds dumb, but I have only a little building experience and none yet with model airplane fairings. I actually intend to practice this on another plane before I get to the pattern plane.

I'll figure it out one way or the other.


(in reply to flianbrian)
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Wing Fairing Detail - 6/15/2003 10:39:14 AM   
KJohn


 

Posts: 264
Joined: 2/19/2003
From: Medina, OH, USA
Status: offline 		If the existing ply fairing is able to be forced to follow the top of the wing right over and beyond the leading edge then you can try this idea. Looking from the front leading edge of the wingtip draw a line (mentally) right along the forward most tip of the wing 'leading edge' and continue this line horizontally where it meets the fuselage, working forward with the line. This would be the 'bottom' of the 'top fairing section'. If this line cuts through the ply fairing that is curving down the front of the wing then that would be where to cut the fairing material. The top fairing material should stop at that horizontal line and it will sort of become a 'fairing/leading edge' combination.

Now picture cutting a piece of 1/32 ply about 2'' by 2'' (which is oversize at this point) so that it fits in the intersection of the wing leading edge and the fuselage and right along the line we had pictured. This would be used to make the 'floor' of the top fairing. Now looking from abobe the plane and straight down on the intersection that has our 1/32 ply piece picture making a curve such that there is a nice transition from the wing leading edge (from the distance of the top fairing material reaches away from the fuselage) to the front of the fairing material edge that we 'cut' mentally just a few seconds ago. This curve can be mild or severe depending on how you want it to look. Cut that curve in the 1/32 ply and again hold it in place. It will look like we extended the leading edge of the wing yet it will act as the 'floor' of the top fairing material.

Now the idea is to fill the area under the top fairing material, above the 'floor' we made and against the fuselage and it would be filled all the way to the surface of the wing to act as part of the 'wing saddle'. This filler material can be something like microballoons and epoxy.

What we should end up with is a nice smooth transition of the top fairing shape to a flat 'floor' that is horizontal and is an extention of the leading edge. Below that 'floor' the wing begins to turn under. If the plane design allows you to make a 'bottom fairing' then start with the 'in place' 'floor' we installed and follow a similar plan of attack on the bottom.

Since I cannot see the actual intersection of the wing to the fuselage it is hard for me to suggest what you would want to do on the bottom portion of the wing. On most pattern planes there is enough 'fuselage' down there (at the tank compartment) and forward of the wing that the designers generally build up the underside of the wing in the area where it meets the fuselage with some type of balsa block and shapes it to smoothly transition to the underside of the fuel compartment. If so, and if you want to introduce a fairing under there then you will probably have to make a two piece fairing, some of which is in front of the leading edge section (under our 'floor') and some which is under the front section of the wing (alongside the balsa filler block I mentioned that is cemented to the wing).

Also you could look at pictures of other planes that have similar fairings and get a general idea of how that transition area was handled.

(in reply to flianbrian)
       Post #: 4

Wing Fairing Detail - 6/15/2003 7:43:38 PM   
flianbrian



Posts: 329
Joined: 3/21/2002
From: Suthrun, IL, USA
Status: offline 		Kieth,
Very good explanation! I've got a better idea now what can be done.

[SIZE=4]Thanks![/SIZE]
flianbrian

(in reply to flianbrian)
       Post #: 5

Wing Fairing Detail - 7/9/2003 8:33:45 AM   
flianbrian



Posts: 329
Joined: 3/21/2002
From: Suthrun, IL, USA
Status: offline 		OK! Here's what I did just for grins on a 4*40.
If anyone wants specifics, just ask.





(in reply to flianbrian)
       Post #: 6

Wing Fairing Detail - 7/9/2003 4:53:53 PM   
beepee


 

Posts: 751
Joined: 2/8/2002
From: Houston, TX, USA
Status: offline 		flianbrian,

Very nicely done!

Now for the real leason - how do you cover them. For small ones I can see it may not be too hard, but I am curious how you would cover those that get pretty broad toward the rear of the wing, like on a Spitty.

Bedford

(in reply to flianbrian)
       Post #: 7

Wing Fairing Detail - 7/12/2003 10:17:39 PM   
flianbrian



Posts: 329
Joined: 3/21/2002
From: Suthrun, IL, USA
Status: offline 		Didn't really want to put covering in this forum, but...

I suspect with enough patience coaxing swearing shrinking and stretching that you could cover this with even the piece from the fuse side. I chose to cover the fairings seperately. I just finished covering one well using 4 pieces, the seams are hardly noticable, and maybe I'll try the other with just one if I feel ambitious (naaaaaah : )

Secure to top side, come over the edge, gradually stretch and bond, with some cuts underneath to relieve some tension.

(in reply to flianbrian)
       Post #: 8

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