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Old May 18, 2013, 08:33 PM
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wingloada's Avatar
United States, MD, Lutherville-Timonium
Joined Apr 2012
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Build Log
Vivace -- Drela Allegro Lite elliptical wing mod

Some of you may have been following, on my blog, my design and prototype build of a modification of Mark Drela's Allegro Lite with an extended 100" elliptical wing that I am calling Vivace. I have decided to make the leap from my blog to the 'public' threads.

Caveat:
I am not an engineer nor an aircraft designer. These modified designs I did for fun from years of building RC planes and gliders. If any of you are interested in following the path and building one, please know that and be prepared to modify the plane as you see fit for better flight characteristics if you find it needs it. If you do so and let me know, I'd appreciate it.

Thanks.

W


-----

Vivace 126" influenced by Dr. Mark Drela's Allegro Lite design with high aspect ratio elliptical flying surfaces. Vivace (lively) is a musical modifier of Allegro (as in Allegro Vivace - fast and lively).

126" larger wing option

Modified 6-23-13 -- Added enlarged tail section proportional to wing increase from original 100" design.
Modified 7-5-13 -- Corrections to the drawings.
Modified 7-15-13 -- Simplified stab construction, added lost foam fuselage for electric version.
Modified 7-16-13 -- Clarified parts for built up stab and fin-rudder.
Modified 7-28-13 -- Minor corrections as prototype build progresses.
Modified 7-28-13 -- Specifications added and outer panel aileron spar dimensions added.
Modified 8-10-13 -- FIxed some mistakes in the electric lost foam fuselage drawing.
Modified 8-14-13 -- Added a lost foam pod with wing pylon fuselage drawing.
Modified 9-12-13 -- Added tow hook details to lost-foam pod.
Modified 9-17-13 -- Some details fixed and added during the build.
Modified 9-20-13 -- Corrected stab airfoil and construction drawings.
Modified 10-7-13 -- Stab construction and flap-aileron drawings updated.
Modified 10-13-13 -- Stab deflections added and dihedral adjusted.
Modified 10-23-13 -- Lengthened electric pod 2" and added wing control deflection templates.
Modified 1-4-14 -- Increased accuracy of the scale measure
Modified 1-8-14 -- Scaled and separated pdfs to print at full scale on 144" X 36" paper
Modified 2-10-14 -- Corrected slightly mis-drawn rib length dimensions.

pdf: http://wkleinsasser.net/download/Vivace_126_pdf.zip

dwg and dfx files: http://wkleinsasser.net/download/Vivace_126.zip

This wing will probably fly best with a fuselage using the Bubble Dancer boom from Mountain Models, or for greater strength, a boom for a Supra.

Materials list:
http://wkleinsasser.net/download/Viv...rials_list.pdf

-----

100" clipped-wing option

Pdfs and drawing files:
http://wkleinsasser.net/download/Viv...ipped_wing.zip

-----

Original Prototype Vivace - 100" Elliptical wing glider/eglider:


Influenced by Dr. Mark Drela's Allegro Lite design with high aspect ratio elliptical flying surfaces. Vivace (lively) is a musical modifier of Allegro (as in Allegro Vivace - fast and lively).

Modified 1-8-14 -- Scaled and separated pdfs to print at full scale on 144" X 36" paper
Modified 1-15-14 -- Updated the revision and date on the drawings to match the update
Modified 1-18-14 -- Corrected mis-drawn spar cap cutouts in ribs W1-W7

pdf: http://wkleinsasser.net/download/Vivace_100_pdf.zip

Drawing files and part cut sheets:
http://wkleinsasser.net/download/Vivace_100.zip

-----

If you have an Allegro Lite and just want to try out the Vivace wing with it,
here is a modification I have drawn that should mount directly on an Allegro
Lite fuselage (the bolt-beam mounting holes should align). I'm not certain that
the Allegro Lite fuselage has room for the wiring from the four-servo wing,
though.

pdf:
http://wkleinsasser.net/download/Viv...e_fuselage.pdf

Drawing file with parts cut sheets:
http://wkleinsasser.net/download/Viv...e_fuselage.zip

-----

For building instructions, I used the Charles River RC site he has for that plane to link to a wealth of information and guidance for the build:
http://charlesriverrc.org/articles/a...egrolite2m.htm

Particularly, I used modified steps from James Osborne's online Allegro Lite Construction Guide, which gives excellent step-by-step instructions for his Allegro Lite build (up to the point where it drops off but by then you'll likely know how to finish).
http://www.charlesriverrc.org/articles/allegro-lite-construction/introduction

-----

I have created a model of the Vivace 100 and Vivace 126 for the X-Plane flight simulator.
http://wkleinsasser.net/download/Vivace_100_Xplane.zip
http://wkleinsasser.net/download/Vivace_126_Xplane.zip

Here's a link to a file that explains how to fly these in x-plane:
http://wkleinsasser.net/download/x-p...directions.pdf

----------------------------------------

I have completed the prototype 100" version and today I began work on the larger wing version with an 126" span.

I'll post building photos and comments as I go. Thanks to all who have already helped with the design and trimming setups.

As always all suggestions for improvements are welcome.

W
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Old May 18, 2013, 09:34 PM
volare est vivere
ray foley's Avatar
United States, OH, Toledo
Joined Jan 2005
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Hi there from Toledo

Magnificent, Bill, simply magnificent!

ciao -rjf
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Old May 20, 2013, 12:58 AM
Registered User
Romania, Dolj, Craiova
Joined Sep 2007
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I have a question, do you consider a good idea to use rohacell instead balsa for shear webs ?
I have a surplus of rohacell, and compressible behavior seems superior to balsa, at less weight.
What about same material for ribs, with a tow of carbon on edges?
Any cons, assuming price of material is not an issue ?
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Old May 20, 2013, 08:22 AM
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United States, MD, Lutherville-Timonium
Joined Apr 2012
817 Posts
I have only used end-grain balsa for shear webbing so I cannot offer any advice on rohacell.

W
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Old May 20, 2013, 08:52 AM
Little Red Plane
United States, TN, Knoxville
Joined Dec 2012
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Did you use a longer tail boom or the original length?
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Old May 21, 2013, 06:19 AM
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United States, MD, Lutherville-Timonium
Joined Apr 2012
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I used the original Allegro boom. With the 126" wing I'll probably need a new fuselage with a Bubble Dancer boom, though, or rig up a slip-over boom extension for the tail.
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Old May 31, 2013, 09:47 AM
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United States, MD, Lutherville-Timonium
Joined Apr 2012
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Outer panels

Work continued on the 126" wing this week. The spar/rib construction for both outer panels is complete. The outer panel bones weigh in at 1.6 oz each and the center main panel bones come in at 5.2 oz. The beefier center spar might be overdesigned. The resulting weight for the full wing spar and ribs is 8.4 oz. Mark Drela's Bubble Dancer RES wing has similar spar-rib structure and the Bubble Dancer plan calls for 1.8 oz. for outer panel spar+ribs+joiner+glue and 5.3 oz. for the main panel spar+ribs+joiner+glue so I think I'm building pretty close to my weight targets so far. Of course, this is a full house wing so it will weigh more in the end than the RES Bubble Dancer wing but the principal structure is on target.

I also built the ply joiner boxes and installed the outer panel joiner boxes while building up the spar and ribs for those panels. Once the main panel joiner boxes are epoxied between the spar caps, each of the joiner boxes will be double wrapped in 1.5 oz. biased fiberglass prior to all the spars being wrapped in aramid tow. The joiner boxes for the main panel will be epoxied in place with a brass sleeve running the full length of the joint (from rib W9 to W11) while the wings are aligned on the board to ensure the exact alignment and sweep of the outer panels. After that the brass sleeves will be removed and replaced with the shorter one for the main panel boxes along with the bent aluminum joiner rod all to be epoxied into place in the boxes while aligned but that will be later when the wing panels are fully built. When I did that step building the Houston Hawk wing, I nearly epoxied the joiner rods into the sleeves from some epoxy that had slid to where it was unwanted -- nearly permanently fusing the wing together. I pulled them apart just as the epoxy had solidified but in time to save having built an 11 ft. span one-piece wing.


W
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Old Jun 01, 2013, 06:51 AM
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Launceston Tasmania
Joined Mar 2004
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Hi W,
This looks great, it's a more pleasing planform than the original.

Thanks for sharing the PDFs. The airframe would look lovely with a semi-transparent covering.

Chris.
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Old Jun 01, 2013, 03:58 PM
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United States, MD, Lutherville-Timonium
Joined Apr 2012
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Sanding the CF spar cap edges round

So here I am at the stage of the wing build I least enjoy. Before I can wrap the spars in Aramid (tedius, but not unfun) I must first round the edges of the CF spar caps so the edge can't cut through the wrapping. I have to round the edges of the spar caps on each of the four edges for the full length if each space between the ribs and that will take a while, all the time creating a small environment of CF dust. I have thought about using a sharp xacto knife and carving the CF rather than sanding it round. I could have rounded the edges before the build, but it's too late for that now.

Does anyone have good advice for best practices when rounding the spar cap edges for aramid wrapping? Sanding and cutting thick carbon fibre makes me anxious because of the dust produced and the potential for health issues from breathing it in.

W

p.s. I know that balsa dust is also no great thing to be exposed to either.
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Old Jun 02, 2013, 01:26 AM
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I wouldn't worry about an 90 degrees edge of anything cutting kevlar It's a mess to cut it with the sharpest tools available.
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Old Jun 02, 2013, 03:03 AM
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Ideally, sand carbon with water to minimise airborne dust but without that option, sand it outside...slowly...and wear gloves and a mask if you're especially concerned.

Chris.
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Old Jun 02, 2013, 03:25 AM
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What thickness are CF spar caps? found width only in the article.

... LE: found 0,014" = 0.35mm
Still no issue for cutting aramid, not sharp enough.
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Old Jun 02, 2013, 06:38 AM
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Spar cap thickness:

Center section: 0.060 top, 0.030 bottom x 1/2"

Outer panels: tapered 0.030 - 0.014 top and bottom x 3/8" (1/4" at tips).
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Old Jun 23, 2013, 02:55 PM
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Quote:
Originally Posted by wingloada View Post
Some of you may have been following, on my blog, my design and prototype build of a modification of Mark Drela's Allegro Lite with an extended 100" elliptical wing that I am calling Vivace. I have decided to make the leap from my blog to the 'public' threads.

Caveat:

I am not an engineer nor an aircraft designer. These modified designs I did for fun from years of building RC planes and gliders. If any of you are interested in following the path and building one, please know that and be prepared to modify the plane as you see fit for better flight characteristics if you find it needs it. If you do so and let me know, I'd appreciate it.

Thanks.

W


-----

Vivace - 100" Elliptical wing glider/eglider prototype design:

Influenced by Dr. Mark Drela's Allegro Lite design with high aspect ratio elliptical flying surfaces. Vivace (lively) is a musical modifier of Allegro (as in Allegro Vivace - fast and lively).

pdf: http://wkleinsasser.net/download/Vivace-100_Elliptical_glider.pdf

Drawing files and part cut sheets:
http://wkleinsasser.net/download/Viv...Elliptical.zip

-----

126" larger wing option

Modified 6-23-13 -- Added enlarged tail section proportional to wing increase from original 100" design.

pdf: http://wkleinsasser.net/download/Vivace_126.pdf

This wing will probably fly best with a fuselage using the Bubble Dancer boom from Mountain Models rather than the Allegro boom that is used for the 100" wing.

-----

100" larger area clipped-wing option

pdf: http://wkleinsasser.net/download/Viv...ipped_wing.pdf

-----

If you have an Allegro Lite and just want to try out the Vivace wing with it,
here is a modification I have drawn that should mount directly on an Allegro
Lite fuselage (the bolt-beam mounting holes should align). I'm not certain that
the Allegro Lite fuselage has room for the wiring from the four-servo wing,
though.

pdf:
http://wkleinsasser.net/download/Viv...e_fuselage.pdf

Drawing file with parts cut sheets:
http://wkleinsasser.net/download/Viv...e_fuselage.zip

-----

I have completed the prototype 100" version and today I began work on the larger wing version with an 126" span.

I'll post building photos and comments as I go. Thanks to all who have already helped with the design and trimming setups.

As always all suggestions for improvements are welcome.

W
I only see the PDF file 126 ", you have the zip file?
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