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Sunday, April 5, 2015

Fuselage-11

April 5, 2015

Happy Easter
15 hours- 613 hours total-
Since the last post I've made quite a bit of progress. It will be difficult to tell from the photographs, but progress none the less.

Over the past two weekends I've attached the vertical stabilizer, the stabilator, the AST and the pitch trim assembly. Each had their separate challenges. I'll start with the vertical. I found that it was best to follow assembly directions. Surprise! Don't tighten the mounting screws until you're got all screws started. It makes it much easier to line everything up. I had problems with one nutplate assembly. The forward lower left. I tried and tried to get the bolt started, but no. Final had to remove the assembly. Removed the offending nutplate, slightly enlarged the bolt hole and then reattached the nutplate. Easy, but time consuming. After that everything fit and I torqued the assembly.

Then it was on to the stabilator! This is really a two person job. Unfortunately I didn't have two people to help. I did have two jackstands, loned by a friend and fellow RV-12 builder. These stands, one on each side, hold the stabilator in place while mounting. Earlier in the instructions for the stabilator build you're instructed to temporarily glue wishers to the inboard and outboard attach points on each side of the stabilator. The reason you do this is to align the stabilator so that when it's mounted there is equal space on each side of the tailcone. For some reason I didn't do this- guess I thought I'd do it later. Had I followed the instructions I don't know if it would have made a difference! Warning- there is very little room to work. The mounting hinges are in close proxcimity to the aft tailcone bulkhead. I used two nails bent at 90 degrees to temporarily attach the stabilator. I inserted the nail from the opposite side of the bolt entry. I slowly backed out the nail as I inserted the bolt and associated washers. It took three or four attempts to get it right, center the stabilator and switch out washer sizes. AN960-10 and 10L. Took me two days to install. Sometimes you just have to walk away.

It was at this point that I decided to move to something a little easier. My first aircraft service bulliten. 14-12-06, F-1206F Bearing Bracket Cracks. Cracks were discovered on Van's demonstraor model after years and many hours of flying. I was at a point in the assembly that made installation of this service bulletin a no-brainer. I have pictures of the replacement assembly prior to installation and then once installed. Pretty simple compared to the vertical and stabilator install. 




The best was yet to come- installation of the pitch trim assembly. Actually that part was pretty easy. The tough part was installing the ES-00047 minature connector pins into the connector body. Crimping the pins onto the 26 gage wire was okay. But trying to lock the pins in the connector body was pure madness!! They only fit one way. Van's doesn't tell you. Just says, if it won't snap in place romove and rotate 90 degrees, I finally got them installed a few broken lines later.

Pictures don't really do the install justice. I've got to do something with the wire bundle. One wire is about an inch shorter that the rest, so when you twist the wires it looks a little crappy.
 Picture of the pitch tirm linkage prior to installation of the electric pitch tirm.

Sunday, March 22, 2015

Fuselage 10

March 22, 2015

33 hours - 598 hours total
Over the past two weekends I've spent a lot of time working on the airplane. The wife has been out of town, so I've spent nearly all my free time at the hanger. So I'll walk you through the progress to date.

Following completion of the lower fuselage section it was time to assembly the rollbar. Looks pretty simple, and it was, just a lot of work. The roll bar is made of two forward, two aft curved pieces of material. The forward and aft curved pieces are held together with two plates containing 24 rivets each. The forward and aft curved assemblies are then held together with one inner-diameter metal strip and one outer diameter metal strip. Again the metal strips hold the forward and aft pieces together. Everything needs to be cleco'd in place. final drilled, disassembled, deburred, reassemblied with clecos and then finally riveted together.

 Example - metal plate joining two curved elements of the rollbar,
 Finished assembly- approximately 88 rivets on the inner diameter, LP- 4-3's and approximately the same number of rivets on the OD, except CS 4-4 countersink rivets.
 The rollbar is attached to the lower fuselage via two mounting blocks.

 Rollbar temporarily installed to the lower fuselage. There is a significant amount of match drilling to the rollbar mount brackets,
A couple of pictures of the completed installation.

Next part of the assembly was to install the baggage compartment bulkhead and rollbar support. The baggage bulkhead is currently attached to the baggage floor structure. When the aft cone is attached the bulkhead will be riveted/attached to the fuselage skins.


 As you can see, I've gone back to sections 10 nd 11 of the build to install the vertical stabilizer and rudder and the stabilator. More to come- decided final assembly would require another day, one where me brain was functioning a little clearer.



Sunday, March 8, 2015

Fuselage 9

February 2015 through March 7, 2015

20 hours, with approximately 565 hours invested in the project. The last couple of months have been a blur and my documentation of the build has suffered. I hope to do a better job moving forward.

You should be able to notice some differences in the background of these pictures. I've moved once again. This time to a hanger at KAVQ to complete the project. All the subassemblies are reunited- tailcone, rear control surfaces and wings. Yesterday I completed section 23 of the build the lower fuselage assembly. I feel pretty good about the quality of the build.

MOVE DETAIL TO COME

This is a view of the lower left fuselage assembly. All stiffeners installed. You can see the wings in the background.

 A couple of picutres inboard left side. I decided to prime the interior lower side skins, but keep the floors unprimed.

 Right side ready to skin.
 A view of the hanger- T-30 size. Large enough......actually a huge amount of space compared to the garage.

 Picture of the right-side wing cut-out and stiffener.
 Both fuselage side skins installed.




 Pilot and passenger vent system installed.

Fuselage - 8

March 8, 2015

Post of progress January 25 - 27 2015 25 Hours Total 545 hours


 







25 hours

Fuselage - 7

March 8, 2015

I've really done a poor job keeping this blog updated. So, I'm going to attempt to get caught up again. The last time I updated the blog was early January. I've made some good progress. I'm going to make three updates. This post covers activity between January and January 24, 2015.

25 hours- Total project time 520 hours [approximate]