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ViperDog Build Thread

Old 07-10-2011, 02:53 PM
  #51  
sahartman21
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Default RE: ViperDog Build Thread

I'm planning to place the control horns inside the fuselage.

Slots are cut out for wire control horns.
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Old 07-10-2011, 02:58 PM
  #52  
sahartman21
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Default RE: ViperDog Build Thread

The tail surface was cut in half and the angle was applied with a sanding block.

I used another model's tail as a jig. Some plastic wrap was applied first and surfaces were tacked in place.

I checked the angle based upon the plans before making the final glue joint.
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Old 07-10-2011, 03:00 PM
  #53  
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Default RE: ViperDog Build Thread

A small amount of baking soda and CA glue was used to fill the gap.

This was later sanded smooth with a sanding block.
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Old 07-10-2011, 03:03 PM
  #54  
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Default RE: ViperDog Build Thread

Two layers of 1.4 ounce fiberglass cloth were applied at the seam.

Some Skin It was squeegeed onto the surface. Set this out of the way to dry.
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Old 07-10-2011, 03:07 PM
  #55  
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Default RE: ViperDog Build Thread

Some 1" square pieces of 1/4" thick aircraft plywood were cut out.

I used Shoe Goo to glue the plywood parts in place. Shoe Goo is very strong and vibration resistant.

A few clamps were used to hold parts in place until the glue dries.
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Old 07-10-2011, 09:56 PM
  #56  
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Default RE: ViperDog Build Thread


I usaully put the center reinforcing pieces on first then the 3/4 ounce over the whole wing. This way the seams of the center pieces are hidden. any reason you do it the other way around??

ORIGINAL: sahartman21

A layer of 3/4 ounce fiberglass cloth is laid on first.

The center sections are reinforced with additional layers of 2 ounce cloth.

There are three layers on the bottom - 9'' wide, 6'' wide, and 3'' wide.

The top has a 6'' wide piece and a 3'' wide piece.

I prefer to apply the wider pieces first. Later apply the more narrow pieces.
Old 07-11-2011, 05:27 AM
  #57  
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Default RE: ViperDog Build Thread

If you put the narrow pieces on first, you can cut through the material of the wider ones as you sand preparing for paint, etc - which means you might as well not have the wider ones there.
Old 07-12-2011, 04:21 PM
  #58  
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Default RE: ViperDog Build Thread

The wing is temporarily attached with masking tape to allow drilling the wing bolts.

Confirm that the wing is on square by checking the measurements. Both sides should be equal distance.
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Old 07-12-2011, 04:26 PM
  #59  
sahartman21
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Default RE: ViperDog Build Thread

Drill and tap the holes for nylon bolts.

Install all the bolts prior to countersinking the heads. A large drill bit was used in the reverse direction to perform this function.

Remove one bolt and then countersink the head. Reinstall the bolt and repeat.
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Old 07-12-2011, 04:30 PM
  #60  
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Default RE: ViperDog Build Thread

The following pictures shows the finished installation.

The fiberglass fuselage fits well to the wing. It is also very strong as evident by the carbon fiber in the nose area.
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Old 07-16-2011, 11:51 AM
  #61  
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Default RE: ViperDog Build Thread

Control horns are made from 4-40 threaded pushrods and a Dubro #180 ball link.

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Old 07-16-2011, 11:54 AM
  #62  
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Default RE: ViperDog Build Thread

The control horns are tacked in place with some CA. This holds parts in place until the epoxy mix dries.

Some micro-balloons and Skin It is mixed.

It should be the thickness of toothpaste.

Apply to one side and set on a flat surface to dry. Do the other the same way.
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Old 07-16-2011, 06:38 PM
  #63  
sahartman21
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Default RE: ViperDog Build Thread

A Dremel tool is use to do the initial shaping on the filler.

A sanding block finishes the job.
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Old 07-16-2011, 06:40 PM
  #64  
sahartman21
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Default RE: ViperDog Build Thread

Use some coarse sandpaper to sand the tail surface and fiberglass.

This is needed to insure there is a good glue joint.
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Old 07-16-2011, 06:44 PM
  #65  
sahartman21
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Default RE: ViperDog Build Thread

Align the model until the wing is set at zero incidence.

Place the tail surface in the V and check the incidence with a string level.

I then mixed some 5-minute epoxy and glued the tail surface in place. Continue to verify that it stays aligned until the epoxy dries.
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Old 07-16-2011, 06:46 PM
  #66  
sahartman21
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Default RE: ViperDog Build Thread

Some 2 ounce fiberglass cloth was applied to strengthen the joint.

A small amount of Skin It was applied to the cloth.

Set it out of the way until dry.
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Old 07-17-2011, 11:27 AM
  #67  
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Default RE: ViperDog Build Thread

A small amount of polyester filler (Bondo) was used to smooth out a couple areas.

Sand the fiberglass first to provide a surface for bonding.

Mix the filler, apply, and let dry.

After a few minutes it is ready to sand.
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Old 07-17-2011, 11:30 AM
  #68  
sahartman21
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Default RE: ViperDog Build Thread

I attached the wing and took a few pictures out in the yard.

It won't be much longer to completion.
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Old 07-17-2011, 11:32 AM
  #69  
sahartman21
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Default RE: ViperDog Build Thread

A 4 ounce and 6 ounce tank were test fit to determine where to install the radio.

A 424 model uses the 4 ounce tank and the 426 model uses a 6 ounce tank.
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Old 07-17-2011, 11:37 AM
  #70  
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Default RE: ViperDog Build Thread

A couple rails were located on the fuselage side for support to the servo tray.

The tray was cut out of 1/8" thick aircraft plywood.

Drill holes for the servo screws prior to installing the tray.
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Old 07-17-2011, 11:41 AM
  #71  
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Default RE: ViperDog Build Thread

The servo tray was glued in place with Shoe Goo. This stuff really holds the tray in place.

Some Velcro was applied to the receiver. Shoe Goo was applied to the back side of the Velcro prior to attaching it to the fuselage.

Set this out of the way and let dry.
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Old 07-18-2011, 06:48 PM
  #72  
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Default RE: ViperDog Build Thread

Tape the motor mount in place and drill holes for the blind nuts.

I also drilled out the mount (1/4" diameter hole) for a 426 style engine kill.

Here is a thread that provides more information on setting up the kill for the 426 engine:

http://www.nmpra.org/phpBB3/viewtopic.php?f=12&t=2826
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Old 07-18-2011, 06:51 PM
  #73  
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Default RE: ViperDog Build Thread

I install the blind nuts through the hole in the firewall.

The blind nut is held with a hemostat and the screw is pulled up tight.
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Old 07-22-2011, 05:57 PM
  #74  
Kevin Matney
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Default RE: ViperDog Build Thread

Looks like some thing i would have made . Looks Great!!!!
Now it you paint RWB It would look like some thing I made!!! LOL
Old 07-23-2011, 09:59 AM
  #75  
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Default RE: ViperDog Build Thread

Pushrods were made from the 1/8" carbon fiber rods.

A piece of aluminum tubing was glued on first.

Next some rubberized CA was applied to the rod.

The threaded end was threaded on by using an electric drill.
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