RE: Fairings at the wing root  
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All Forums >> RC Airplanes >> Aerodynamics >> RE: Fairings at the wing root
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RE: Fairings at the wing root - 7/26/2008 11:33:21 AM   
pimmnz


 

Posts: 559
Joined: 11/9/2005
From: Auckland, NEW ZEALAND
Status: offline 		The fairings will make no difference to the a/c aerodynamically other than to tidy the airflow a bit around the wing fuselage junction. Adding a bit to the wing tips, provided the extensions follow the taper of the wing, will make no difference to the MAC. So, nothings changed, then.
Evan, WB#12.

(in reply to iron eagel)
       Post #: 26

RE: Fairings at the wing root - 7/26/2008 12:19:16 PM   
N1EDM



Posts: 1984
Joined: 7/19/2002
From: Brockton, MA, USA
Status: offline 		You pose an interesting question about the fairings being part of the fuse or the wing. I think they'll be part of the wing because of their airfoil shape, but the lift probably won't be enough to affect the flight characteristics very much. That's just a WAG on my part...

Nice job on blending in that first fairing. Is that the finished fairing or are you going to put in a 'rain gutter'? (i.e., sand the surface concave)?

Bob

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AMA 4307 Club Saito Member #61
An expert is someone who has been doing it for 15 minutes longer than you.

(in reply to iron eagel)
       Post #: 27

RE: Fairings at the wing root - 7/26/2008 6:32:41 PM   
iron eagel



Posts: 1325
Joined: 7/15/2004
From: Middleboro, MA, USA
Status: offline 		last night as I looked at the fairing on the airplane I really started to think about how such a large fairing would effect the aerodynamics of the airplane and became concerned enough to ask about what these effects might be. Both replies thus far have helped to calm my fears.

I am curious about if they are considered part of the fuselage or a lifting surface. For the moment I am looking at them as being part of the fuselage and proceeding as such.

Bob,
Thanks.
As far as sanding the concave into the fairing, perhaps a bit, but not all that much as pimmnz observed they are intended to tidy up the airflow around the fuselage wing junction. The picture shows the fairing just sitting there it is not blended into anything at this point. As far as blending all I am going to do is add fillets around the fairing where it meets the fuselage and the wing, and call it good. The other part of my question was how to treat the joining are between the widest top part of the fairing and the top of the fuselage on the canopy hatch/canopy front.

< Message edited by iron eagel -- 7/26/2008 6:49:00 PM >

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The Wrights never crashed, they only had hard landings. I 've had some hard landings myself. AMA EAA AOPA revver #185

(in reply to N1EDM)
       Post #: 28

RE: Fairings at the wing root - 7/27/2008 5:38:42 AM   
BMatthews



Posts: 9015
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		Sorry to bust your bubble but they aren't all that large. Certainly not enough to need to factor in any changes for wing area or concerns about lifting fuselage area.

With a model that may have aspirations to flying in a 3D mode with harriers and hovering you won't want to use really big fairings anyway. If they are really large it'll move the inner edges of the ailerons out and slightly reduce the ability to use the prop blast for control.

What your present fairings will provide is possibly a cleaner flow over the inner aileron area. I guess time will tell.

< Message edited by BMatthews -- 7/27/2008 5:40:50 AM >

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(in reply to iron eagel)
       Post #: 29

RE: Fairings at the wing root - 7/27/2008 5:53:48 AM   
iron eagel



Posts: 1325
Joined: 7/15/2004
From: Middleboro, MA, USA
Status: offline 		Thanks Bruce!

Where they are just over 22 inches long and 3/4 of an inch thick I figured that they may be a issue as far as COG or alike.
The neat thing is that they look cool and make a real nice transition from the fuselage to the wing if nothing else. But they do stiffen up the fuselage sides some and weigh in a 0.4 oz each so I am not adding a hole lot of weight with them and I had already chopped out a lot more than that out of the fuselage already.

I am still in a bit of a quandary of how to join the fuselage top hatch to the fairing as far as blending could you see what you think about that. It is about 1/4 of an inch above the base of the canopy hatch and around 2/3 as high as the hatch.
Would it be better to blend the fairing into the fuselage to or the fairing into the fuselage in your opinion.

_____________________________

The Wrights never crashed, they only had hard landings. I 've had some hard landings myself. AMA EAA AOPA revver #185

(in reply to BMatthews)
       Post #: 30

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