Pit Bull Construction
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Pit Bull Construction
Some of the recent discussion about Scat Cat got me looking for something similar. The Scat Cat is no longer available.
I wanted a low wing model that would fit full size radio gear.
A Matney's Models "Pit Bull" short kit fit my needs fine.
The kit consists of fiberglass fuselage, foam wing cores, plans, and landing gear.
You will also want to purchase glass cloth and Skin It epoxy when ordering your model.
I wanted a low wing model that would fit full size radio gear.
A Matney's Models "Pit Bull" short kit fit my needs fine.
The kit consists of fiberglass fuselage, foam wing cores, plans, and landing gear.
You will also want to purchase glass cloth and Skin It epoxy when ordering your model.
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RE: Pit Bull Construction
I chose to use the sheet metal style landing gear.
The plans did not show the installation so I marked them up based upon discussions with Kevin.
Two pieces of half ribs are installed in front of the carbon fiber strips. They are shown approximately 4" and 5.5" from the wing center section.
The plans did not show the installation so I marked them up based upon discussions with Kevin.
Two pieces of half ribs are installed in front of the carbon fiber strips. They are shown approximately 4" and 5.5" from the wing center section.
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RE: Pit Bull Construction
In this photo is the beginning of the vacuum bag.
It is made from a piece of 4 mil thick piece of plastic tarp.
The bag will later be sealed with latex cauking.
It is made from a piece of 4 mil thick piece of plastic tarp.
The bag will later be sealed with latex cauking.
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RE: Pit Bull Construction
You mix about 1.5 ounces of epoxy per wing half.
The picture shows laying the fiberglass cloth on a wing half.
It is a 5" wide piece of 2 ounce fiberglass cloth that joins the top and bottom skins together.
This will later become part of the trailing edge and ailerons.
The picture shows laying the fiberglass cloth on a wing half.
It is a 5" wide piece of 2 ounce fiberglass cloth that joins the top and bottom skins together.
This will later become part of the trailing edge and ailerons.
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RE: Pit Bull Construction
Here I am taping a wing half with skins between the top and bottom wing shucks.
By taping the parts are held in place until put in the vacuum bag.
By taping the parts are held in place until put in the vacuum bag.
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RE: Pit Bull Construction
Install the vacuum tube, rope, and paper towel prior to closing the vacuum bag.
Apply some latex caulking around the edge. Fold the tarp over to make a bag.
Turn on the vacuum pump. It should pull down to 6" of Hg vacuum and turn off.
Apply some latex caulking around the edge. Fold the tarp over to make a bag.
Turn on the vacuum pump. It should pull down to 6" of Hg vacuum and turn off.
#12
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RE: Pit Bull Construction
Helpful suggestion,,, insure that the surface is completely flat with no bumps prior to pulling vacuum and placing weights on the "wet" cores. Placing weight on the wings during the bagging process on an uneven surface can induce warpage.
BV
BV
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RE: Pit Bull Construction
In about 24 hours the epoxy is dry.
Turn off the vacuum pump and remove the skins from the shucks.
Remove the tape and get ready for the next step.
Turn off the vacuum pump and remove the skins from the shucks.
Remove the tape and get ready for the next step.
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RE: Pit Bull Construction
One of the reasons I chose the "Pit Bull" was because full size servos can be used in the model.
Below is a sketch showing one way to install the servos.
Below is a sketch showing one way to install the servos.
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RE: Pit Bull Construction
Shape the leading edge of the wing with a sharp knife.
Next use a razor plane and then finish with sanding paper.
I typically just try to get two similarly shaped leading edges.
Next use a razor plane and then finish with sanding paper.
I typically just try to get two similarly shaped leading edges.
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RE: Pit Bull Construction
Join wing halves with 30 minute epoxy.
I taped the joint so that resulting edge is relatively smooth and doesn't require much sanding.
I taped the joint so that resulting edge is relatively smooth and doesn't require much sanding.
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RE: Pit Bull Construction
Make a servo tray out of 1/8" plywood.
CA a couple balsa strips just below the line that was drawn earlier.
Test fit the servo tray and when it fits properly glue it in place using Goop or Shoe Goo.
CA a couple balsa strips just below the line that was drawn earlier.
Test fit the servo tray and when it fits properly glue it in place using Goop or Shoe Goo.