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Old May 04, 2014, 07:16 PM
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Seattle, USA
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Build Log
The Parallax - Build Thread

At the suggestion of the designer mopar_man, this is a thread for your experience building the Parallax, an asymmetrical park flyer.

Terry Dunn's Parallax (3 min 25 sec)


The model was featured in the May 2014 issue of Model Aviation:
http://www.modelaviation.com/parallax

Plans are available from the Model Aviation Plans page:
http://www.modelaviation.com/plans

Clear canopy available from Park Flyer Plastics

Data for the 100% version (from the plans):

Wingspan: 32 in.
Length: 33-1/2 in.
Weight: 14-17 oz.
Wing Area: 161 sq. in.
Motor: 100-200 watt outrunner
Battery: 3S 800-1300 mah
Servos: 4 * 9g servos
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Last edited by jeffsch; May 04, 2014 at 07:46 PM.
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Old May 04, 2014, 07:23 PM
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Gallery

<Reserved for pictures of finished models>
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Last edited by jeffsch; Jul 01, 2014 at 09:35 PM. Reason: Add a picture of a great model!
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Old May 04, 2014, 07:37 PM
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Seattle, USA
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A 1/4" foam build

The Parallax is such a cool model, I had to build it.

I didn't have a ready source of 1/2" foam to hand, so I adapted the plans for 1/4" foam; it makes the build a little bit more complicated, but the plans are so straightforward that I don't anticipate any problems.

Here's my progress up through getting the fuselage framed up.
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Old May 04, 2014, 08:02 PM
Terry Dunn
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United States, TX, Lubbock
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Thanks Jeff,
I'm looking forward to seeing how you and others interpret the plans. Looking good so far.
Terry
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Old May 04, 2014, 08:47 PM
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Hey Jeffsch, what in the world are those triangular things you are using to hold things in place? They look magnetic too.
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Old May 04, 2014, 08:57 PM
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Seattle, USA
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Magnetic right angle triangles from Harbor Freight. I use them overtop of a galvanized steel building sheet, and they work great at holding parts in place.

http://www.harborfreight.com/4-3-4-q...lder-1938.html
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Old May 04, 2014, 08:59 PM
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United States, LA, Blanchard
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welders use them to hold parts a a perfect 90 degree angle. so there has to be a metal plate under the plans..
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Old May 04, 2014, 09:41 PM
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Singapore, Singapore
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Oh man, I've been doing it wrong all these years. I didn't even know they existed. What a clever little doohickey. Thanks, I shall hunt around and see if I can get it locally. The side of one of my old computers is steel and should do nicely as a flat ferromagnetic surface.
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Old May 04, 2014, 11:43 PM
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ekees's Avatar
Medford, Oregon
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Quote:
Originally Posted by mopar_man View Post
Thanks Jeff,
I'm looking forward to seeing how you and others interpret the plans. Looking good so far.
Terry
Me too! As a noob builder from plans, I hope to learn a lot from this build thread.
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Old May 06, 2014, 09:34 AM
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Seattle, USA
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1/4" foam build progress

I glued the bottom of the fuse onto the sides. (No picture.)

The pod is going together in the same was as the fuse.

I put the first former 2" from the front of the pod, two formers to support the wing, the last former where the pod begins to taper in the back, and another former or two to help shape the front of the pod.

Each former is a rectangle, the width of the top-view at a given location on the plans, the height of the side view, and with notches cut out of its corners for the doublers. (Took longer to describe than to do it.)
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Last edited by jeffsch; May 08, 2014 at 10:05 AM.
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Old May 07, 2014, 09:58 PM
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Bakersfield, CA
Joined Apr 2008
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Terry - this build seems to be a bit different than the one presented in the AMA magazine. I ordered the plans and just got them today. Will start to build soon.

Richard
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Old May 07, 2014, 10:15 PM
Terry Dunn
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United States, TX, Lubbock
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Quote:
Originally Posted by RJD1234 View Post
Terry - this build seems to be a bit different than the one presented in the AMA magazine.
You're right. I build my fuselage and pod assemblies with 1/2" blue foam, so I don't need the formers and doublers that Jeff is using. Apparently many folks have trouble finding the 1/2" foam in their corner of the country, so they're substituting with the thinner stuff you see here (which needs the formers). Use whichever method you're more comfortable with (or have materials for).

I'll try to add to the thread with a build matching the plans.

Terry
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Old May 08, 2014, 09:58 AM
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Richard, you're right. I couldn't (easily) source the 1/2" foam so am going with thinner foam (Model Plane Foam actually). Looking forward to seeing some other builds!
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Old May 08, 2014, 10:05 AM
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Seattle, USA
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1/4" foam build progress

Glued the bottom onto the pod; saving the top until after the wing is in and servo wires are run.

Glued a chunk of pink insulation foam onto the front of the pod and shaped into a nose cone. It takes longer for the glue to dry than it does to shape the foam blank, and the results are quite satisfying.
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Old May 08, 2014, 11:19 AM
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Bakersfield, CA
Joined Apr 2008
588 Posts
Terry, Jeff - thanks for the replies!! It would be great if a build thread was presented as per the plans. But this is cool too.
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