Wednesday, March 19, 2014

Pneumatic Rivet Puller Malfunction.

Last night while finishing up the right anti-servo tab, the rivet gun jammed and I had to finish pulling the rivets by hand.  Pulling any significant amount of rivets will make you appreciate the air tool.

A big thank you to Bob at Avery Tool.  This gentleman has been extremely helpful with any technical questions.  He quickly guessed that the problem was multiple rivet shanks collecting in the exit tube and jamming up the jaws that engage the rivet shank.  He then explained how to disassemble that section of the tool and clear it.  I did as instructed tonight and the rivet puller is back in business.

You can buy the same (or similar) tools many places, but this type of service after the sale really sets Avery Tool apart.  I highly recommend them.

The completed assemblies are starting to add up.  So far to date:


  • Vertical Stabilizer
  • Rudder
  • Right Anti-Servo Tab
  • Left Anti-Servo tab
Next up....  The Horizontal stabilizer.  This piece appears to be a bit more involved than its predecessors.  This seems to be the theme while building this kit.  The skills you learn in one section are built on for the next.  For the most part, I am very impressed with the development of the kit and its plans/assembly manual.

Build time to date:  56.3 hours

Sunday, March 16, 2014

Moving Forward.

The Rudder

The Rudder is complete.  There was really only one challenge in completing the Rudder assembly.  The area where the upper hinge brackets mount to the rudder spar is assembled using some larger solid (squeezed) rivets.  The lengths are longer than the smaller solid rivets used up until this point.  While trying to squeeze these rivets, the shop head side (the side that does not have the factory finished head) kept squeezing off the the side. I probably had to drill out 10 solid rivets before I recalled reading a post on the Vans Airforce website a few months ago that appeared to apply to my situation.   That evening I spent some time relocating the forum post and the next day I went to the hardware store and purchase some 1/8" inside diameter clear plastic tubing; the kind you might see as fuel line for a remote controlled airplane engine.  By placing a small section of the tubing (slightly longer that the shop head side of the rivet that protrudes through the material to be riveted) over the shop head side of the rivet, the rivet shank it held on center when the rivet is squeezed together.  Additionally, the rivet tool surface contacts the tubing prior the the shop head of the rivet and when squeezed applies pressure to the the base of the materials to be riveted together; thus ensuring a tight contact point of the pieces prior to expansion of the rivet.  Thanks the Lord for engineering type guys that have built aircraft before me.  This simple modification of the process is something I would have never figured out myself.

Some pictures of the rudder.






The Anti-Servo Tab(s)

An anti-servo tab, or anti-balance tab, works in the opposite way to a servo tab. It deploys in the same direction as the control surface, making the movement of the control surface more difficult and requires more force applied to the controls by the pilot. (source wiki)

Basically, the anti-servo tab(s) moves in the opposite direction of the elevator in order to balance the control forces when pulling the nose of the aircraft up or pushing it down.  My Cessna does not utilize this counterbalancing system for the elevator control.  It instead uses a section of the elevator that is controlled by a trim wheel.  Without the use of the trim wheel, the control forces required to make elevator inputs can be substantial.  My guess is the use of the anti-servo tab(s) aids in the balanced feel of flying the Vans RV-12.

There are two tabs (a left and right).  They are mirror images of each other.  I have completed the left and am in the process of the right.   Picture below.

  
Spring has sprung!

The shop is getting a bit warmer.  In a month or so, the temps will begin to become an issue. I need to explore ways to cool things down before summer arrives.  Mackenzie and Allia don't seem to mind the warmer weather though.



Wednesday, March 12, 2014

Back in business.

Yesterday my friend Pedro came by and helped me skin the VS assembly.  There were a few key points where his extra set of hands came in useful aligning some key holes on the leading edge of the assembly.  Took about an hour and half and we are now back to the point where the wheels fell off the bus last month.  So basically a month delay and another $300 plus dollars and it is time to start moving forward again.




Sunday, March 9, 2014

Replacement parts arrive.

The replacement parts arrived Friday afternoon.  I unpacked, inventoried and began work Saturday.  Before I knew it six hours had passed and the VS (part deux) was well underway.  Another three hours today and we have a completed skeleton.

This time I went ahead and mounted the upper rudder hinge bracket prior to skinning the assembly.  I had to make some minor adjustments to the mounting holes in order to get he bolt holes to line up on the rear spar and the brackets.  for the life of me I can not figure out why Vans has this step after the entire assembly is buttoned up rather than earlier when a problem could be addressed much easier.

I will skin the assembly this week and be back where I was a month ago.  I'm guessing this will not be an isolated incident of 2 steps forward and one step back.  Building an airplane is a marathon not a sprint.  A fellow builder gave me a good piece of advice in the form of a question.  How do you eat an elephant?  .....one bite at a time.

Sunday, March 2, 2014

New Parts for the VS Assembly on the way!

Getting the parts.
It took a while, but the new parts for the VS assembly "Part Deux" are on the way.  Van's has a reputation for being very good at support after the sale.  I am hoping that my recent experience is an isolated incident.  I waited 3 business days for a response to a tech email question and over a week for a replacement parts order to be processed.

The knee.
In the mean time, I experienced another setback with my right knee.  While nursing issues with my meniscus for a few months, it popped again last week and left me semi-crippled (and squealing like a child) for the second time in 60 days.  My amazing wife successfully managed to have my surgery pushed up to this past Friday (initially scheduled for mid April).  Friday I had the surgery and appear to be healing well.  Worked out to be a good use of the building downtime.

New hours of operations.
I'm looking forward to getting the replacement parts in and cranking back up the assembly plant.  In the interest of continued marital bliss, I am going to make a voluntary self-adjustment to the operating hours of the assembly plant.  Regular operations will be on Tuesdays and Thursdays after work.  Build will also take place other times when opportunities present them self w/o interfering with family time.  Anyone who wants to help, or just stop by and visit to take a look, is welcome to swing by on Tuesday or Thursday evenings.  I'll be the guy limping around (in the near term).

Tuesday, February 18, 2014

Highs and Lows of Aircraft Building

The Highs

Friday evening my brother-in-law hung out with me in the garage as I riveted one side of the VS skin to the VS skeleton.  It was quite a sense of accomplishment to remove the last cleco and pop the last rivet on one side.



Saturday I took Carice's Uncle John Glancy for a ride in the Cessna.  It was a nice day but breezy.  On takeoff, winds were 290 16 knots gusting to 27 knots.  Not a big deal for departure on 27L, just kept it in ground effect a bit longer to build up airspeed incase of a gust drop.  We took a nice flight  south off the coast.  Visibility on the Vero Beach reefs was top to bottom.  Mental note - good time to get some lobster.  Came back to MLB over the river for a left base entry for 27 left.  Winds were 300 16 knots gusting to 27.  Flew final at 75 instead of 60 and landed with two notches of flaps instead of 4.  Nice landing.  Managed to take a first time C172 passenger up and keep him comfortable from takeoff to landing.  Success.



Once safely on the ground we made our way to the Cunningham aircraft manufacturing facility (the garage) to show off the plane build.  We pulled a few rivets on the other side of the VS.  I ended up finishing the riveting of the VS saturday afternoon.  I was a happy aircraft builder!

The Lows

Sunday there was one final step in order to be able to set the VS assembly aside and move onto the rudder.  I had to bolt the upper and lower hinge brackets to the rear spar.  No big deal I thought.  Long story short, some how I cross threaded and/or stripped two of the bolts and they would not tighten to the torque settings called out.  they just kept spinning when fully inserted into the nut plates (riveted to the other side of the spar - inside the VS assembly).  I decided to remove them and check the threads.  No luck, the bolts will not back out.  They just spin.  Very frustrating!

I decided the only hope of getting these bolts to unscrew was to open up the skin I just riveted on (it looked so pretty) to access the back of the bolts.  I hoped that if I placed pressure on the back side of the bolts, the threads might catch and I could unscrew the bolts.  about half way through drilling out the rivets I need to in order to peel back the skin, my drill bit walked of the top of a rivet and placed a nice scar on the skin.  Frustrated, the next rivet I drilled out was drilled off center and I wall-erred  out a rather large oval from what used to be a circle (this is very bad).

At this point I stopped and took some pics to send to Van's builder support.  I was hoping to salvage the assembly some way.

Tuesday (today) I still have not heard back from Van's on my email.  I gave the benefit of the doubt that they were closed for President's Day yesterday.  I was surprised (and disappointed) that I did not receive a response today.  None the less, I opened up the rest of the skin on one side and tried my technique to remove the bolt.  It did not work.  I then began trying to drill out the bolt.  These bolts are HARD.  It was eating drill bits.  Bottom line, I have decided to order new parts and rebuild the assembly in its entirety.  It would just bug the crap out of me if I didn't anyway.





The next build day I will move onto the Horizontal Stabilizer (HS).

Thursday, February 13, 2014

Vertical Stabilizer - ready to button up.

Tools, tools, tools.

Remember those tools I was talking about?  Well one of the tools I need to de-burr/smooth the edges of the large aluminum skins is a "double edge de-burring tool".

  I ordered it online sunday evening so it should have shipped Monday.  I was expecting to receive it on Wed after work, but no luck.  Now it is Thursday evening and I have hit a stalling point.

The VS is all ready to button up with about 150 blind pulled rivets each side.  Problem is that I need to de-burr the edges of the skin before riveting it together.  Here are a few pics of the skeleton going into the skin and the assembly cleco'd together (a cleco is a temporary spring loaded fastener).  This is as far as I can go on the VS assembly until the tool arrives.







On to the Rudder.

Without being able to go any further on the VS, I decided to move onto the Rudder.  The rudder is the aft extension of the VS that pivots left and right from the rear spar of the VS.  This is linked to footpedals in the cockpit and controls the airplane's horizontal L/R movement.  Anyway....

The rudder assembly goes together much like the VS assembly.  The main spar is matched up with some spar caps.  These are smaller pieces that nest into the main spar to provide additional support for areas where hinges mount or areas that will carry a higher stress load.  They can be seen in this photo along with a hinge (temporarily mounted with clecos).


Additionally, the rudder spar has a control horn attached to the bottom of it.  This is where the control linkages will eventually connect the rudder to the cockpit control pedals.


From this point, the rudder ribs will attach, perpendicular to the rudder spar, to create the skeleton of the rudder.  The skeleton will then be slipped inside the rudder skin and riveted together; similar to the VS assembly.

Seems simple and straight forward.  The devil is in the details, or should I say de-burring.  Every hole has to be final drilled, then de-burred.  Every spar and rib has to have all edges smoothed and de-burred.  This is because fine cracks along the edges can turn into small cracks over time, which can turn into large cracks.  You can get the point from here.

Truth is, this aircraft will not be aerobatic and will be flown more like a sport sedan than a race car.  The stress loads I will eventually place on the aircraft will likely never give it an opportunity to present a problem.  However, I am one of those people that believe in planning for the worst case scenario and enjoying when it doesn't happen.

Another road block.

The next step calls for the rudder spar to be test fit to the pivot hinges on the rear spar of the completed VS assembly.  Well, no completed VS assembly, so no way to do this.  I can't move forward with the rudder until it passes the test fit.  Once the spar caps and hinges are riveted into place, it would be a royal pain to have to change/adjust it.

I could move onto the next assembly or start cleaning up all of the rudder ribs in preparation for later steps that involve them, but the anal retentive side of me is starting to get sketchy about moving too far past multiple uncompleted steps.

Carice's Aunt, Uncle and Cousins are coming into town for the weekend tomorrow.  There has been talk about taking the boat out on the river, so I will be taking a few days off building.  Hope everyone has a good "Hallmark Holiday" aka Valentine's Day.

Tuesday, February 11, 2014

The Vertical Stabilizer


February 11, 2014

The Vertical Stabilizer

Well, this evening things really started coming together.  The skeleton of the VS went together fairly straight forward.  The real time consumer is de-burring all of the holes and the edges of all of the ribs.  Once that was done, it was simply attaching some more nut plates and riveting the skeleton together.








Although it appears close to complete, there are still quite a few steps to complete and a ton of nut plates to install on the interior of the skin.  I dimpled all of the nut plate screw holes today and that went well.  Before I can attache the skin I need to de-burr the edges.  I am waiting for a special tool to make that task manageable.  It should arrive in a day or so.  Then final drill, de-burr and rivet 150+ rivet holes for each side of the skin.  Right now everything is very flimsy, but once the skeleton is riveted together with the skin it will be rock-solid.

Can't forget to fly!

Sunday Carice and I flew the Cessna up to Deland and picked up Mackenzie from my Mom's where she spent the weekend.  It really doesn't save that much time to fly to Deland vs. drive, but it is a lot more fun.  Mackenzie rode in the co-pilot seat for the first time (on the way home) and flew the plane for a while while watching an airborne sunset.  Momma was in the back seat doing the iPhone thing.



Monday, February 10, 2014

Building the RV-12


2/10/2014
Building the RV-12

How we got here.

In 1997 when I was working towards my Private Pilot License, I was bitten by the Experimental Aircraft Bug and decided that one day I was going to build an aircraft and fly it!  The past 16+ years have taken many twists and turns.

OK I'm going to build a Zenith Zodiac or maybe not.

In 2005, I was registered for a rudder building workshop at the Zenith Aircraft factory and was going to begin building a Zenith Zodiac.  After some thought I decided that the timing was not right.  My responsibilities were growing with a newborn (Mackenzie) at home and career opportunities at CIA.  I decided to table the build before it started.  Shortly after that I stopped flying for a number of years.

Man I want to start flying again.

Fast forward to early 2012.  I was in NC spending some time at the cabin with Carice and Mackenzie.  After making multiple 10 hour drives each way, I decided it was time to start flying again.  I went down to the Murphy-Andrews airport (RHP) and found a flight instructor.  Throughout the following summer I spent some time becoming proficient again and learning the nuances of flying in the mountains.  I obtained my medical and started looking for a plane to purchase.

Man it would be cool to have your own plane.

In June I purchased a 1963 Cessna 172D, from a family in rural NJ, off eBay (yes I bought a plane off eBay).  The transaction was handle sight unseen through an escrow agency recommended by AOPA.  I hired a certified aircraft appraiser to make a complete appraisal, and report, prior to closing the transaction.  About a month later, my friend Troy Townsend (a pilot for US Airways-now American Airlines) met me in Philly.  We drove up to Jersey, picked up the plane and flew it to the cabin in NC that same day.  We spent the next day waiting out a hurricane that was blocking our route home to MLB.  After waiting for a hole in the clouds to depart through, the following day was a smooth flight home VFR over the top to MLB.  That trip in itself was a life experience and a great memory forever.

OK I'm going to do it!

Once flying again and now the proud owner of a "well seasoned" but sturdy & dependable certified aircraft, I quickly started thinking about building.  In mid 2013 I began my standard multi-month research phase again.  This time there were two aircraft that caught my eye; the Zenith (later model of the same plane I was going to build before) and the Van's Aircraft RV-12.  I decided to visit the annual Seabring Light Sport Aviation Expo in hopes of flying both the factory demo aircraft.

Let's go fly these bad boys.

On January 16, 2014, I arrived at MLB, at sunup, to fly the Cessna to Seabring.  It was a very cold morning  Following a few minor mechanical issues (leaking gas collator drain valve and a weak battery due to the cold weather), I departed and flew to Seabring for my first ever fly-in aviation event that I arrived by aircraft instead of by auto.  There are special arrival procedures and the number of aircraft converging at the same time can make it a bit intimidating.  I was one of 6 aircraft converging on the field simultaneously.  You had to keep your head on a swivel.  Once in the established pattern it was basically a game of follow the leader.

After getting the Cessna tied down, I made my way directly to the Zenith booth (they were still setting up) and spoke to the Owner of the company.  I scheduled a test flight for about an hour later in the morning.  I then made my way directly to the Van's booth and viewed an absolutely beautiful factory built version of the RV-12 that was being delivered to its new owner.  I was given a demo flight time slot in the early afternoon.  Now I can go check out all of the cool stuff at the show.

Flying the Zenith.

At 11:00 AM I showed up for my demo flight in the factory demo.  After a briefing and waiting on the UL Power engine oil temps to warn up, the Demo pilot made a take off and remained in the "demo pattern".  Before handing over the controls in level flight, he warned me that flying an LSA (Light Sport Aircraft) was a bit different than flying a Cessna 172.  He said that it required much less control input.  Once I took the controls I know why he did that. There is a world of difference between flying a C172 and a Zenith.  The folks at Zenith would probably take exception to this, but I found the controls to be so sensitive they are almost twitchy.  After making a few rectangles in the sky, at a demo pattern altitude, I began to get the feel and smoothed out the control inputs.  The aircraft flew different than I had anticipated, but was not a disappointment by any means.  I handed the controls back over to the demo pilot, he landed and I thanked him.

Flying the RV-12

At 1:30 pm, I showed up for my demo flight in the RV-12.  This flight was quite a bit different.  We did not utilize the "demo pattern".  Instead, we took off and exited the airport vicinity in order to be able to really fly the aircraft through different phases of flight.  The demo pilot lifted the plane off the ground.  As soon as a positive rate of climb was established, he handed the controls over to me.  I immediately felt the difference in this aircraft and the Zenith.  While very responsive (much more so than the Cessna), the controls were smooth and balanced; not the least bit twitchy.  We flew for about 20 minutes before heading back to the field.  I put the aircraft through climbs, descents, shallow turns, steep turns.  The demo pilot then demonstrated stalls for me.  I was thoroughly impressed.  The "RV Grin" was firmly planted on my face.  My decision was made. 

OK, I know which plane to build now what?

After heavily researching the RV-12 building process for a few days, I decided to order the kit.  On January 21, 2014 I ordered the Empennage/Tailcone kit.  Knowing that it would show up in 10 days or so, it was time to get to work.  Many hours were spent clearing out the garage.  My friend Rob Olivares helped me build a 4'x8' work table, on rolling castors, that would survive a WWII bombing raid.  My awesome wife, Carice Cunningham, helped me with the dreaded yard sale.  Roughly 30 man hours later, we had a legitimate (well not really) aircraft manufacturing facility (also known as part of a three car garage) that doubles as the garage for my wife's car. 

Now I need some tools.

While most people have "basic hand tools", and all the kit manufactures say that their kit goes together with basic hand tools, DO NOT BE FOOLED.  The term "basic hand tools" means something all together different to normal people than it does to crazy people like me that build airplanes.  The "basic hand tools" kit I purchased in order to build the RV-12, was right around $1,700.  This was about 2x what I was figuring on.  Additionally there were a few items that were not included in the kit.  While not 100% necessary, it sure would be a pain in the butt to build without them.  They totaled right around $300 more.  While I could likely have skinned this cat in a less expensive manner, with the little knowledge I had at this point I decided to rely on the experience of the professionals.  If I ever take on another build project, I will surely know what I am looking for and locate used tools for a fraction of the cost.  Nothing in aviation is cheap and it is all relative I suppose.  The tools showed up a few days after placing the order.  I spent about an hour or so  unpacking, inventorying, and getting familiar with some of them.  They are all nice and high quality.

The kit is being delivered.

On Wednesday February 5, 2014, at roughly 11:30 AM, the kit was delivered.  Crating was excellent.  The crate was roughly 3' wide x 9' long x 1' deep.  Van's does an amazing job packaging the plethora of components into the crate.  It is like a giant Tetris puzzle.  My only complaint is some of the packaging tape they use to secure parts was so high tack that it is almost impossible to remove without removing the protective film on the metal skins.  That evening, my friend Craig Boileau came over and helped unpack, and inventory, the components included in the kit.  Everything was there.  We were able to store most of it put away in a half-way rational manner.

The plans.

That same evening I spent about two hours reading all of the introductory information in the plans/assembly manual.  There is a ton of information in there and the plans are extremely thorough.  Although some of the diagrams look a bit like optical illusions.  With all of the reading under my belt it was time to go to bed.

Let's build!

Thursday February 6, 2014, after work, was the first official day of the build.  For some reason, when building an airplane, simply tasks like final drilling a series of pre-drilled holes become stressful.  It really is silly when you think about it.  I have no doubt these aircraft are over engineered and have safety factors built into the designs.  The designers have to know that guys like me, putting these things together, may not necessarily be rocket scientists; although I'm sure some builders are.  In another build blog I read a very good motto to sum it up...."you are building this thing to fly to Memphis, not to Mars".  I have to remind myself of this.  I also have to remind myself, from time to time, that I want it to make it to Memphis.  Anyway, the first night's build consisted of putting together a few brackets that I believe will be used to attach the rudder to the vertical stabilizer.

Vertical Stabilizer.

Saturday afternoon I spent about 4 hours working on the rear spar.  This consisted of match drilling a ton of holes in various parts, and de-burring the holes and edges of the parts.  The de-burring and smoothing is a pain in the butt and it has to be completed on every part.  By the time I finished this I had placed a few blind rivets as well as a hand full of solid rivets.  I thought I was getting pretty proficient at this riveting thing.  Wrong!

Monday (today), after work I spent a few hours continuing to work on the VS skeleton.  I came to a step where I had to install some nut plates with solid rivets.  Three of the first five rivets I totally messed up and had to drill out and replace to continue.  Drilling out a blind rivet is a piece of cake; a solid rivet...not so much.  I am going to continue to work on the VS assembly and will likely post another entry once the bigger pieces start getting assembled together (it starts to look like something).