Insulation Complete

 

Today I completed the installation of the styrofoam insulation between the spars. I used 1 1/2 inch think styrofoam that comes with plastic laminated to both sides. I glued it with contact cement. The foam sheet is very rigid and will not conform to the curved contour of the cabin unless it is kerfed. I cut kerfs every inch and a half with my table saw. The kerfs are about 3/4 of the thickness of the sheet. You apply the contact cement to the surface of the insulation and to the wood surface and allow it to dry to a state where it feels is about like the gummed surface of a 3M sticky note. At that point pressing the glued surfaces together bonds them. Contact cement dissolves polystyrene foam so you apply it only to the plastic covering of the foam sheets and try to keep it out of the kerfs and off the edges of the foam.

Here's what the kerfed sheet looks like after I have bonded it to the surface.

Ta da... Insulation has been applied in all the spaces between the spars. Next step is to get all of those electrical wires into channels and then I can put the outer skin on the trailer.

Wiring is Finished

Above are a couple of pictures from the inside of the cabin looking at the electrical panel with covers removed.  There are eight 12V fused circuits. In hindsight perhaps I over killed it a bit on the design of the circuits. I probably could have done the job with only four by clumping multiple devices together on a single circuit. Now that it's done, however, I am very happy with how it turned out and if there is ever a problem with a fuse blowing it will be very easy to isolate because every circuit only has one or two devices on it. I'm also glad I provided plenty of room in the front for placing the fuse box. By spreading things out I was able to keep it looking fairly neat and simple to see what's going on when troubleshooting a blown fuse. In the left picture above, on the far left wall you can see a switch plate that has been connected to the wires but not yet fastened to the wall. Here is a view of it after it has been fastened to the wall:

The wall is only 1 inch thick and I found that the switches are deeper than that. In order to get them to fit I had to make a deeper pocket by adding the thickness of the switch plate. It is made of 3/8 inch plywood. I have a pair of switches like this near both  doors. One switch turns on the porch light just above the door so if you want to get out at night you can switch the porch light on from inside before you open the door. The other switch turns on the dome lights inside the cabin. If you are getting in at night you can reach in and turn on the dome lights before you enter. These switches are located less than a foot from the door so with the door open you can easily reach in to hit the switch. They are also near the head of the bed so that you can easily turn on the dome light from under the covers while you are laying down from either side of the bed.

I wanted to show you what the wiring looks like on the outside. On the driver's side outside wall of the trailer is a waterproof shore power connection which I bought at camperworld. Near  it you can see a yellow romex wire that goes over the top to feed two 110V outlets, one in the galley and the other in the cabin. From the battery you can see a red and a black pair of 8 gauge wires. They travel from the battery underneath the trailer where they enter from below through holes drilled in the framing. All of the smaller gauge black and red wires have now been tested and when I fasten in the insulating foam I will put them all into channels and give them some order. I realize that right now it kinda looks like spagetti. The amazing thing is everything worked when I powered it all up. All the outlets were live, the lights all switched like they were intended, and even the battery tender was wired right and started charging the battery as soon as I plugged in the shore power and turned on the 110V switch.

Progress on the Bench and Electrical

This is the framework I made at the front of the teardrop to house the electrical system. The left compartment will be for 12V system and the right compartment for the 110V system. The shore power will come in through the front of the far right wall. In this picture the hole has not yet been cut. The top blue box is for the 110V fuse and main switch and the box just below it will have a power outlet which will be used to plug in the battery minder/charger.

This is a view of the same area however I have installed the cover and removed the access panels which are held in place with 4 magnets each. I want to point out some components.
1) This little metal box contains a 15 amp 110V fuse.
2) The master 110V switch is in the same unit as the fuse. I found this switch and fuse unit at Lowes.
3) This is a 110V convenience outlet into which the battery minder/charger is plugged. This outlet is wired in parallel with the other 110V outlets in the trailer.
4) This is the battery Minder/Charger. It will charge the battery when the trailer is plugged into shore power. This unit also desulphonates the battery automatically. Cool! It has indicator lights when your battery is low or if a cell is dead.
5) Oops looks like I skipped 5.
6) This is the main switch for the 12V system. This switch is rated for 40 amps it is wired directly to the positive post of the deep cycle battery using #8 wire. It was a bear soldering #8 stranded wire to the terminals on this little switch.
7) This is a 40 amp thermal breaker that automatically resets.
8) This is the 12V fuse box and grounding bus. I will show it in a later post after I have connected the circuits and added the automotive fuses. The grounding bus is connected to the negative battery post with #8 wire.

Here you can see the panel cover with the access panels in place. The panel forms the back rest for the bench. (someday it will have cushions.) I asked Cheri to take a shot of me sitting on the bench. I have plenty of headroom, I was just scrunching down to peer through the door.

In the photo above the bench is stowed. You have a good view of the piano hinge, the three metal mounts into which the legs are fastened when the bench is in use, and if you look close you can see the bolts on the top left and right which hold the bench in the stowed position. They bolt into the wall on either side.

The Bench Design

 

In my requirements at the beginning of this build log I said that I wanted to be able to sit up in the trailer. Meeting that requirement involved making the trailer a little taller than most and building a bench. As you can see above I have designed a bench that folds down from the front wall of the cabin. You attach three legs to the bench when you set it down and you move two sections of the mattress up onto the bench to turn it into a padded sofa. This will come in handy on those rainy days when we need a dry place to hold up for a few hours with a good book, a deck of cards, or maybe watch a movie. When the sun comes out again you go back out and resume fishing.

I included the picture to the left, without the cushions, to give a better view of the bench which will be made of 3/4 inch ply with a hardwood lip to keep the cushion in place. Behind the bench there are four cubbys. The lower two cubbys will be for whatever you like... maybe a spare flashlight and a first aid kit. The upper cubbys will have doors on them (not shown) and will house the electrical components such as fuse box, breakers, battery charger and so on.

Thumbnail Ideas for Paint Job

 

 

 

 

I used some of my recent time on airplanes to make these sketches on my iPad using the Brushes app. The Z and double Z at the top are rip offs from looking at old trailers. I think these are nice retro looking motifs. I have seen the blue-on-blue swoosh in the second row on more than one teardrop, often made from two or more different shades of wood. I don't know if I will use any of these but right now I am favoring the Yellow and Red Wave and the abstract Multi-Color Mural designs. If I don't use them at least they occupied a few hours of time on otherwise boring plane rides.

Interior Cabinets are Complete

I pasted the cut away view of the cabinets from sketchup because it is a little easier to see what is going on than the photos below. In order to get the photos I need to sit down on the floor at the far end and hold the camera above my heard right against the wall so I can't see the viewfinder. That explains the kittywampus angle of some of the pics. There are two cabinets with doors on the right and left sides and two openings in the middle. The lower opening has a removable shelf that is sloped for holding a laptop. And when I say laptop I mean "entertainment center". Its what plays movies and music these days so I thought I might as well get with the times and build a place for it here. The small shelf above is for the "sound system". That's where we will set the jambox when we are playing movies or listening to music. If you don't know what a jambox is you should check the link. It puts out great sound and operates wireless from on bluetooth. I can sync it to my laptop or my ipad, its battery powered so I can use it in the trailer or carry it out to the picnic table. I toyed around for a long time with the idea of installing a car stereo system and a flat screen TV but the laptop idea just seemed to make the most sense. It can play DVDs and it can store nearly my entire CD collection of music.

The upper left pic is with the cabinet doors open and the computer shelf stowed. The center pic is with the cabinet doors closed and the upper right pic shows the computer shelf in position and my laptop sitting on it. You can see two openings below the computer shelf. One will have a 110V outlet and other 12V. I have also wired 12V to the back of the upper compartment where the jambox will be. There is another 12V wire pair hanging down from the cabinets. That will be wired to a small electric dashboard heater. An electric heater will draw too much current to use very long but I think it will take the chill out of the air when we get out of bed on cold mornings.

Starting Work Inside the Cabin

 

The pictures above are from the process of gluing together three sheets of 1/8 inch masonite which would become the inner curved front wall and ceiling of the cabin or "headliner". I saw this method described by Mike Schneider in his Generic Benroy plans. I cut the sheets to the inner width of the cabin minus 1/8 inch to give a little room for error. I also cut a 3-inch strip of masonite for each joint. The joints were then glued using gorilla glue by butting the ends together and using the 3-inch strip to overlap each side of the joint by 1.5 inches. I put a strip of glad wrap on the top and bottom to keep the glue from sticking to the garage floor and the boxes. Boxes of canned food were used as weights to do the clamping. I let the glue set overnight. I learned a valuable lesson which will benefit you. Next time I will use waxed paper instead of plastic wrap because, while the plastic wrap protected against glue adhering to other surfaces, the gorilla glue adhered quite well to the plastic wrap so I had a pretty big job of sanding to remove the plastic wrap from the surface. In the upper right picture you see the glue joints after they have been sanded and then covered with bondo. After the bondo set I went over the joints with my orbital sander to produce a smooth and continuous headliner sheet that is 1/8 inch less than the cabin width and a couple of inches longer than needed. This long thin sheet proved impossible for one person to manipulate so, with help of my daughter Sydney, I inserted the sheet for a test fit. I marked the exact length, the removed it and cut it to the correct length. The  final installation was done by applying construction adhesive to the inside of all of the spars then inserting the headliner again and screwing it in place. 

 

In the pictures above you can see the installed headliner from two views. Outside and inside.

I also got started on the cabinet inside the cabin. More to come on this in my next post. Tomorrow is labor day so I hope to have this looking a lot more like a cabinet by the end of the day.