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08-21-2018, 05:00 PM
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Join Date: Oct 2009
Location: Edson, Alberta, Canada
Posts: 483
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Such things are a blessing!
Great news on your wife and being able to continue the build with her!
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Dave Cobb
[color="Red"]=VAF=2019 Donation - and a bit extra for great work![/COLOR="blue"]
Empennage RV 7 - Tipper
Wings complete
Dynon installed and running
Fuse closer to completion, Canopy complete
AME reviewed and repaired O-320-Lyc installed
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08-21-2018, 06:04 PM
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Join Date: Nov 2006
Location: Savannah, GA
Posts: 1,029
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Thanks everyone! Things are progressing nicely and the fuselage is now ready to flip. I just need a cradle to set it in... so I'll work on drawing that up and work on fabricating it this week.
Now if we could only beat some sense into the insurance company so they'll stop dithering and pay the rest of the bills... 
__________________
RV-7ER - finishing kit and systems installation
There are two kinds of fool in the world. The first says "this is old, and therefore good"; the second says "this is new, and therefore better".
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09-11-2018, 07:13 AM
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Join Date: Sep 2018
Location: El Paso, TX
Posts: 8
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go tech!
Great looking future airplane!
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11-20-2018, 12:28 PM
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Join Date: Nov 2006
Location: Savannah, GA
Posts: 1,029
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Got some coworkers over with promises of beer, and we mounted the wings last week.
Today I checked rigging.
Incidence is a hair high (bubble is touching the forward mark) but it's even on both sides, all the way out (no twist).
Edge distances are good.
Triangulation is dead on to 1/32".
Both wings are swept forward 3/8" at the tip.
The flaps touch the bottom skin perfectly.
Close enough for government work!
Now there's a couple days' break for Thanksgiving and for my aft bolt drilling tools to arrive. Going to crack a cold one...
(And yes, that's our old stove back there... perfect for baking parts post-painting...)
__________________
RV-7ER - finishing kit and systems installation
There are two kinds of fool in the world. The first says "this is old, and therefore good"; the second says "this is new, and therefore better".
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11-21-2018, 07:58 AM
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Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 1,530
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You do realize with those forward-swept wings you're going to need a fly-by-wire control system to keep that twitchy airframe from departing straight-and-level, right?

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Bill Boyd
Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD reserved - under construction
donating monthly to the VAF - thanks, Doug
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11-21-2018, 12:51 PM
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Join Date: Feb 2005
Location: 20km outside of Zurich, Switzerland
Posts: 468
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Forward swept wings ... need to trim the rear spar.
Hello
I had also forward swept wings, but not that much.
Mostly it comes from the rear spar, that is not trimmed enough like it is in the plans. The spar is touching the fuselage side skin. This pushes the wing forward.
Maybe you want to check the rear spar and fix it before you build on.
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Dominik
RV-7A, TMX-IO-320, FM-150, Sensenich FP
Flying since 28. April 2016
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11-21-2018, 02:28 PM
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Join Date: Nov 2006
Location: Savannah, GA
Posts: 1,029
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Quote:
Originally Posted by swisseagle
Hello
I had also forward swept wings, but not that much.
Mostly it comes from the rear spar, that is not trimmed enough like it is in the plans. The spar is touching the fuselage side skin. This pushes the wing forward.
Maybe you want to check the rear spar and fix it before you build on.
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The tolerance for sweep per the Mothership is 1/2in. I'm within tolerance, so I'm not going through this exercise again. Tolerances exist for a reason.
__________________
RV-7ER - finishing kit and systems installation
There are two kinds of fool in the world. The first says "this is old, and therefore good"; the second says "this is new, and therefore better".
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11-22-2018, 04:15 AM
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Join Date: Nov 2006
Location: Savannah, GA
Posts: 1,029
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Quote:
Originally Posted by Bill Boyd
You do realize with those forward-swept wings you're going to need a fly-by-wire control system to keep that twitchy airframe from departing straight-and-level, right?

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Well, technically forward-swept wings don?t automatically make for an unstable airframe, from the pilot-controllability standpoint at least. That?s a function of change in pitching moment with respect to change in AOA and all that. The Hansa Jet had mild forward sweep, and (as far as I can tell) had conventional natural stability characteristics.
Now, forward-swept wings typically are unstable aeroelastically and are much more prone to a phenomenon known as ?divergence?. Essentially, as the wing generates more lift, it wants to twist nose-up. Twisting more nose-up menas it generates more lift, which makes it want to twist even more nose-up... and very quickly your wing twists itself up and off the airplane. You deal with that by making your wing really, really stiff (which is what the X-29 did using tailored composites).
At least, that?s what I remember from aeroelasticity class 
__________________
RV-7ER - finishing kit and systems installation
There are two kinds of fool in the world. The first says "this is old, and therefore good"; the second says "this is new, and therefore better".
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11-22-2018, 07:50 AM
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Join Date: Jul 2016
Location: Worland, Wyoming
Posts: 1,365
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I definitely agree with you, 3/8" sweep would not worry me in the slightest. Just out of curiosity though are your rear spars hitting the rivet pointed out in this picture? I put flush rivets here (someone said there may be interference here) to avoid this but I'm wondering if it was necessary.
rear spar rivet by Jereme Carne, on Flickr
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Jereme Carne
PPL
RV-7A Emp. done
Wings done
Fuselage done
Finish kit almost done
Exempt but gladly paying!
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11-22-2018, 09:37 AM
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Join Date: Nov 2006
Location: Savannah, GA
Posts: 1,029
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Quote:
Originally Posted by jcarne
I definitely agree with you, 3/8" sweep would not worry me in the slightest. Just out of curiosity though are your rear spars hitting the rivet pointed out in this picture? I put flush rivets here (someone said there may be interference here) to avoid this but I'm wondering if it was necessary.
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The left side is; I'll trim it when the wings come off to eliminate contact but I'm not messing with it just to fix something that's within tolerance.
__________________
RV-7ER - finishing kit and systems installation
There are two kinds of fool in the world. The first says "this is old, and therefore good"; the second says "this is new, and therefore better".
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