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Old 09-24-2018, 09:26 PM
blaplante blaplante is offline
Join Date: Jan 2010
Location: Southern California
Posts: 82
Question Sport Aviation - Glattli RV - wing/fuselage intersection

Page 58 of the Sept 2018 Sport Aviation caught my eye... the article on Bill Glattli's RV 3 noted that he built a different wing/fuselage fairing, based on his experience with doing the same on his RV-6 and gaining 7 mph.

This video also got me looking at the 6 and noticing that the fuselage starts to taper before the trailing edge of the flap. Seems like there is something to gain here and Glattli says "... I think is worth the relatively small amount of work involved".


But... I just can't visualize how to taper this back into the fuselage correctly. The video mentions needing to create an 'after body' to do this. None of the photos of Glatti's 3B show the area in detail.

What would be great... does anyone have a photo of the trailing edge wing/fuselage area on RV-6A N51WG? Or you've seen it and can describe?

Thank you
RV6A in phase 2 as of April 2016
Donation made Sept 2018

Last edited by blaplante : 09-24-2018 at 09:30 PM. Reason: corrected 6A to 6
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Old 09-25-2018, 02:12 PM
F1Boss's Avatar
F1Boss F1Boss is offline
Join Date: Aug 2006
Location: Taylor Texas
Posts: 732
Default Look backwards!

Have a look at the root fairings on the DC-3 and Spitfire (to name only a couple examples). The DC3 had to climb to a specified altitude on one engine, and the Spitfire had to retain energy in an aerial battle. Both goals used the same thoughts: smooth out the airflow at the wing root, along with other facets. Both goals were met - as we now know.

Now, the fairings on those planes might be exaggerated a bit, tho I would think both were highly optimized for the task at hand. Those fillets had to be rather large.

The AR5 has smallish fillets, but Mike knew where the canopy had to be relative to the wing, so it seems his fillets ended up smaller than the dramatic parts on the transport and fighter.

I produced wing root fillets for the F1, but as far as I know, none were tested without those parts attached. I did sell some of those to other racers, but again I did not get any feedback regarding speed. One fella did say the plane felt more solid at lower speeds - but what does that mean regarding performance?

I also recall one fellow producing fillets that bulged as opposed to the std sort of fillet - seems I heard they worked, or did not - at about the same frequency.

So it seems you have to specify to yourself what the use of the part is to determine it's size, but it does seem to provide at minimum a better climb rate, or lower drag at high alpha angles.

If you proceed, please let us know what your opinion is after installing the parts.

"Not everyone needs a Rocket. Some folks, however, shouldn't live life without one.
You know who you are."
Budd Davisson, 1997
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Old 09-25-2018, 03:59 PM
az_gila's Avatar
az_gila az_gila is offline
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 9,855

Not very clear but some shots of Bil Galatti's RV-6 are here. Look closely for the fairing -
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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Old 09-25-2018, 04:40 PM
terrye terrye is offline
Join Date: Feb 2010
Location: Vancouver, BC, Canada
Posts: 752
Default Wing root fairings

This has been discussed before:
If you go ahead be aware that there may be a negative effect on the stall characteristics. Test carefully.
Terry Edwards
RV-9A (Fuselage)
2018/2019 VAF Contribution Sent
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