Chapter 18 – Canopy
In this chapter we finally start to make the boat look like a plane…..or at least something other than a boat………
The first step is to mount the hinges for the canopy on to the fuselage. The picture below shows this step. I used a level to make sure the hinges were aligned properly with each other so there won’t be any binding when the canopy is opened.
The plans give detailed steps on building a jig and constructing the turtle back but I purchased the turtle back from Featherlite. I figured this piece is a highly visible part of the plane and any flaws are easily detected. Featherlite also uses Kevlar honeycomb between the glass layers. It is stronger, lighter in weight, and they vacuum bag the whole thing so the surface is very true. It will require very little fill before paint. It also saves about a month in labor for me. Here is a shot of the turtle back in place on the fuselage.
When I sat in Nat’s plane, I found my head was pretty close to the canopy. Nat is considerably shorter and doesn’t have this problem. He has given me recommendations on how to increase the headroom. It is very easy and all you have to do is raise the front of the TB by about an inch. This will give me about 2” more head room where the canopy is in relation to my noggin. In the picture below you can see the sliver of foam under the TB.
The TB is actually cut in two once the canopy is add so the rear most window and portion of the TB are permanently mounted to the fuselage. The TB gets cut between the two side windows and the front window and canopy are designed to open to the side. Again an ingenious way of marking out this cut line is shown in the plans. You simply measure back a certain distance from the front and mark on the bottom of the TB, next a second measurement is placed further back on the top. A straight board is placed between the two points and a ruler is placed on the board and points are marked along the tangent of the board. It worked very well. The pictures below shows this.
Next, comes the installation of the side windows. See the FAQ’s in the archives for an easy way of doing this. I did have to do a little math and subtract the height difference created by the foam insert so the windows wouldn’t look like they were sloping down hill. I ordered my canopy and side windows from Todd Silver at Todd’s Canopies. It came very well boxed and the quality seems first rate. The side windows come oversized so the builder can opt for larger windows if they wish. The front windows are large enough and I don’t plan on too many people in the back for any long flights so I opted for the plans size. The windows are installed by inserting them between the fiberglass layers. First you cut the hole in the TB and I used my dremel with a small grinding stone to clear out the honeycomb ¾” all the way around the perimeter of the window. Next, a slice of glass is removed from the inside layer of the TB and the window is slid in and bonded with flox. The picture on the left shows one window taped and the outside edges sanded and ready for install. The picture on the right shows them held in place during cure.
For some reason while I was working with the windows, all I could think of was working on the plastic Revell models when I was a kid. No matter how careful I tried to be, I still always managed to get the glue on the plastic windows. This invariably ruined the whole project. I can report that all 4 windows are in place and no “glue” is on them. Now all I have to do is protect them from “glue” and scratches for the next two years of additional building……..Oh boy!
Here’s the completed window install…..
Some builders that have completed their projects have said that the fresh air vents are ineffective in allowing enough air into the cockpit. It’s because the composite construction is a much tighter fit than aluminum with its joints and seams. The air simply has no place to exit the plane. I added an exhaust vent that another builder suggested. It is incredibly simple yet effective. I installed it in the back portion of the TB where it will be out of sight. The install involves cutting a small vent on the outside of the TB and the inside uses an adjustable vent just like on your Kraft parmesan cheese dispenser. I used some urethane foam as a spacer because you can’t mount a flat piece of aluminum to the rounded side of the TB. Here are the pictures of the outside and inside portions of the vent.
Next, onto permanently attaching the TB to the fuselage and building the canopy frame.