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ViperDog Build Thread

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Old 06-02-2011, 05:32 PM
  #1
sahartman21
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Default ViperDog Build Thread

The UPS man was good to me today! [8D]

He brought a ViperDog kit to replace my Mad Dog. It met it's end at the CAPS race.


The kit comes with a fiberglass fuselage, foam wing cores, and aluminum landing gear.

If you want a ViperDog just order a Mad Dog kit and add comments in the notes to send a ViperDog instead.
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Old 06-02-2011, 05:35 PM
  #2
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Default RE: ViperDog Build Thread

The nice thing about the ViperDog is that the fuselage fits the Viper (Great Planes) wing and tail.

I prefer to build my own so that will be done here in the thread.
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Old 06-02-2011, 05:38 PM
  #3
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Default RE: ViperDog Build Thread

Kevin (Matney's Models) molds a lightweight fuselage that is also very strong.

The nose and other areas are reinforced with carbon fiber and Kevlar.

It weighs a scant 7.4 ounces.
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Old 06-02-2011, 05:52 PM
  #4
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Default RE: ViperDog Build Thread

Kevin has listened to modelers and made a couple improvements to the original Mad Dog fuselage.

1) The tail is widened to allow internal control horns.

2) The nose fits the square back-plate mounts.

3) The landing gear block is reinforced with both carbon fiber and Kevlar.


This model should fill the bill for someone that broke an original Viper fuselage or for someone that wants to build a new model.
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Old 06-03-2011, 06:53 AM
  #5
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Default RE: ViperDog Build Thread

Hey where is the rest of the build???? You wet our appetite and then leave us hanging???





Just kidding Scott, I always enjoy your build threads!!!
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Old 06-14-2011, 08:45 PM
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Default RE: ViperDog Build Thread

Hey Scott where did you go????
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Old 06-16-2011, 08:41 AM
  #7
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Default RE: ViperDog Build Thread

Hopefully I will begin construction this weekend. I've been working extra hours and haven't felt like building when I got home.
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Old 06-16-2011, 09:01 AM
  #8
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yeah, that working for a living sucks..
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Old 06-18-2011, 01:11 PM
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Default RE: ViperDog Build Thread

I used three pieces of 4" x 1/16" x 48" balsa to make each wing skin.

Just trim parts to fit and tape.

Each skin was later trimmed to about 10 1/2" wide. This leaves a little overhang on both sides of the wing shucks.

Both skins were joined with a piece of masking tape. You leave about 1/8" of gap between the skins to allow for folding.
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Old 06-18-2011, 01:18 PM
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Default RE: ViperDog Build Thread

Cut a 6" x 48" piece of 2 ounce fiberglass cloth.

Tear off a 3/4" x 48" section of carbon fiber.

Lightly spray a small amount of 3M 77 adhesive to the sheeting.

Tack on the 2 ounce cloth at the wing fold (like a book).

Tack on the carbon fiber on the bottom sheeting.
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Old 06-18-2011, 01:22 PM
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Default RE: ViperDog Build Thread

Spray some 3M 77 to the shucks and then attach waxed paper.
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Old 06-18-2011, 01:27 PM
  #12
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Default RE: ViperDog Build Thread

Use a razor saw to cut a slot for the carbon fiber vertical spar.

It is a piece of 1/2" x 36" x 0.021" carbon fiber.

Mix a small amount of wing skin epoxy and dab it in place using a disposable brush.

Push the carbon fiber spar in place and dab a little more epoxy as needed.
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Old 06-18-2011, 01:42 PM
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Default RE: ViperDog Build Thread

Some 3/4 ounce fiberglass cloth is laid on the sheeting prior to applying the finishing epoxy.

Mix about 1 ounce of finishing epoxy for each side. About a cap full of 91% alcohol is added to each cup to thin out the epoxy.

The contents are immediately drizzled on the wing panels and then squeegeed out until the epoxy covers.
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Old 06-18-2011, 01:45 PM
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Default RE: ViperDog Build Thread

The sheeting and wing cores are placed between the shucks.

Adjust parts to fit and then temporarily pin the parts together.

Tape the parts together, insuring parts are straight, and then remove the pins.

I used vacuum bags made from 4 mil thick pieces of plastic tarp. Commercial vacuum bags also work fine.

The edges were sealed with inexpensive latex caulking.

A picture of my Vacuum Pump is also shown. It was made from a refrigerator compressor, a few pieces of PVC, and uses a vacuum switch to shut off. It turns off at about 6" of vacuum.

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Old 06-19-2011, 11:56 AM
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Default RE: ViperDog Build Thread

The core was removed from the vacuum bag.

Check to insure that the wing core remained true in the shucks. Adjust if needed.

Trim the leading and trailing edges flush with the shucks.

Use a sanding block to true up the edges.
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Old 06-19-2011, 12:00 PM
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Default RE: ViperDog Build Thread

There were a few dings on one piece of sheeting.

These were fixed by applying a small amount of water to the dings.
A dings absorbs the water and return to the original shape.
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Old 06-19-2011, 12:04 PM
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Default RE: ViperDog Build Thread

A piece of 1/4" x 3/8" x 48" balsa stick was glued on with epoxy.

Masking tape holds parts in place until the glue dries.
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Old 06-19-2011, 12:07 PM
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Default RE: ViperDog Build Thread

Draw a reference line down the center of the balsa leading edge.

I used a knife, razor plane, and sand paper to shape the leading edge.
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Old 06-19-2011, 12:09 PM
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Default RE: ViperDog Build Thread

The trailing edge was shaped with a sanding block.

The wing sheeting was later sanded until it was smooth.
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Old 06-19-2011, 12:11 PM
  #20
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Default RE: ViperDog Build Thread

The wing was sheeted with medium weight wood and came out at 11.1 ounces.

Using light or contest wood will drop the weight a couple ounces.



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Old 06-20-2011, 06:23 PM
  #21
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Default RE: ViperDog Build Thread

Thanks are Looking great!!! Keep up the Good Work!!!!
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Old 06-21-2011, 06:31 PM
  #22
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Default RE: ViperDog Build Thread

I spent a few minutes sanding the seam smooth using a sanding block.

A 3/4" hole is drilled in the front of the fuselage to provide access to the back of the firewall (for blind nut installation).
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Old 06-21-2011, 06:39 PM
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Default RE: ViperDog Build Thread

The location of the wing mounting bolt holes were identified for the fuselage and wing.
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Old 06-21-2011, 06:43 PM
  #24
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Default RE: ViperDog Build Thread

A 3/4" hole saw was used to drill the holes.
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Old 06-21-2011, 06:47 PM
  #25
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Default RE: ViperDog Build Thread

Pieces of electrical tape seal up holes prior to gluing.

Some 30 minute epoxy was used to glue the dowels in place.
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