Matt's RV-7 Project

The replacement brake hoses arrived from Sacramento Sky Ranch and I got them installed in the airplane. Hooray, everything fits!

Here's another photo of the passenger side. I don't know why I took this – nothing has changed on this side.

Remarkably, none of these hoses touches or rubs on any other hose when the pedals are moved back and forth. I really lucked out here.

I went ahead and torqued all the fittings in the brake system, along with the fuel vent fittings on the fuselage sides (the vent fittings on the floor need some work before I can put them in). I used a little dab of torque seal on some fittings here and there just to remind myself that I have indeed torqued them down.

I bolted the rudder pedals in for good, and riveted the rudder pedal brace to the firewall. These rivets were tough to squeeze because the parking brake valve was almost entirely in the way. Wish I'd riveted this piece on before I permanently installed the valve. Oh well, I made it work in the end.

I spent most of the day studying at the library, but I got a few things done on the plane this evening. I safetied the autopilot servo mounting bolts, double checked the aft elevator pushrod length, and torqued a bunch of nuts in the area of the elevator bellcrank. Doing the safety wire took a long time – I always seem to need multiple tries to get safety wire put on right.

If you look closely, you can see the washer that I put between the two halves of the bellcrank, where the autopilot servo's pushrod pivot bolt goes through. If you don't do this, you can't properly torque the nut because the two halves of the bellcrank just smoosh together when you tighten it. A set of washer wrenches is invaluable for little tasks like this. Or, if you haven't built your bellcrank yet, make your F-635B spacer large enough to fill the space where the servo's bolt goes through.

Then I reinstalled the fuel vent lines and torqued the fittings through the fuselage sides. I didn't install the vent fittings on the belly yet, as I'm waiting on some brass screen material to arrive first.

This photo is a reminder to myself that I need to drill out the nutplates on the seatbelt attach brackets and replace them with the dimpled kind, since I'm using countersunk screws wherever possible on the cockpit floors.

Okay, so I decided to tear out the Aeroquip hoses that I had going from the brake reservoir to the passenger's brakes and replace them with the stock nylon tubing instead. I couldn't find a way to anchor the top end of the Aeroquip hoses, and I was worried about broken fittings.

One interesting new skill required for working with the nylon tubing is inserting the brass ferrule in the end of the tube. I dunked my tubes in boiling water to soften them up (no, I'm not cooking meth here).

…then smashed the ferrules into place by pressing them down against a hard surface (in this case a pair of pilers that were handy).

Here's my method for getting the brass sleeves in the compression fittings all the way down onto the end of the tube. First I start with the sleeve plus three of the brass nuts and a long socket:

The long socket is used so there's enough grip area to turn it by hand, and the extra brass nuts are just used as spacers. Once you get it threaded, you can smash the brass sleeve into place by cranking down on the nut to force it home.

I suppose this method only works for one end of the tube, but that's all I needed here. At any rate, after you get it squashed into place, the sleeve sits in the cavity at the end of the angle fitting:

This is a photo to remind myself how the various pieces of the Nyloseal fittings at the top end go together. The same basic setup will be used elsewhere for the pitot/static lines:

Here are the finished lines. I am keeping the Aeroquip lines that go between the passenger and pilot side brake pedals, since they look like they will work well. Still, this whole saga of playing around with alternate kinds of brake lines has been time-consuming and expensive. It's probably not worth it to deviate from the plans here after all, but now that I'm finished with I ain't changing back!

Next, I spent some time fabricating the rigid lines that go between the parking brake valve and the firewall fittings. This took some bending artistry – luckily it came out very nicely:

Here's another shot of the bottom end. The right-hand brake line jogs to the left so that it won't get in the way of the pilot's right brake pedal.

After that, I primed and painted another batch of interior parts. It was a little windy outside to paint, but in Kansas you don't get many days that aren't.

I also drilled a hole for a snap bushing in the left side of F-705, symmetrical to the other one I installed on the right side for the power supply. This one will be for antenna wiring and also for my ELT, which I think I'll probably end up putting on the floor aft of the pilot's seat.