In transit from Virginia to Germany, the fuselage bottom had separated from the 1/4″ plywood sled to which I had it attached.  The sled held the shape of the fuselage bottom to that of the shape of the bottom contour of the sides of the fuselage.  Since I would have to remount the fuselage bottom to its sled so it would be shaped correctly, it follows that I would have to remove it first. So that’s exactly what I did.  However . . .

When I pulled the fuselage bottom off of the sled (it took a lot of convincing!) about a 2″ x 3″ sized chunk of foam ripped off of the bottom side of the fuselage and remained on the sled.  This foam came off the fuselage right under the pilot’s seat pan where the foam is at one of its thinnest points.  It looks as though a fair amount of epoxy soaked through the foam, maybe through a hole, and bonded the foam to the plywood sled underneath.  I tried to pull the foam off and reuse it to plug the divot, but it wasn’t coming off without a fight.  So I simply cut the hole rectangular and made the same shaped plug to fill it in.

Continue reading →

Well, another repair in the making.  Which leads me to somewhat of a philosophical observation that I made to my buddy Marco one day:

Building an experimental airplane is really nothing more than having the wherewithal to continuously fix all the mistakes you make as you build it.

With that point in mind, I spent the entire evening hunched over the back half of the fuselage bottom, sanding off all the dead micro & epoxy.  I’ve got to get to that fresh foam before I can reglass the back half of the fuselage. [Uh, so I got a little carried away last night after the fuselage repair was finished and I failed to take any “before” pics of the back end of the fuselage bottom.]

After I got the back half of the fuselage bottom down to foam, I evaluated the front half of the fuselage bottom surface.  Not nearly as good as I had hoped . . .  that botched vacuum bagging effort really took its toll on this layup.  There were a few distinct areas on the front half of the fuselage bottom that were grossly delaminated.  In the areas of smaller air pockets I simply drilled holes and injected the delams with epoxy via syringe.  The larger delaminated areas I ground out the dead glass and will add an extra ply of glass overlapping about 1″ onto the good skin of the fuselage bottom layup.  It will add a little extra weight, but there is definitely enough good fiberglass on the surface to negate grinding off all that glass down to foam to reskin.  I’ll live with the little bit of added weight.

I guess it’s all part of paying the piper in the game of homebuilt airplanes.

FUSELAGE IS REPAIRED!!! YEAH!!

Whew!  I removed the clamps and nails from the triangular stringers and ALL LOOKS GOOD!  Again, the fuselage is repaired and I can move on! Continue reading →

With the the left side foam prepped for glassing last night, I did a quick crosscheck and cleaned up a few minor rough spots.  I made a 2-ply UNI layup employing the “Poor Man’s Pre-preg” technique.  With plastic sandwiching my 2-plies of UNI glass I would be able to drive out more excess epoxy and easily cut the layup into the shape I needed, which was a somewhat inverted “T” shape… a “T” due to the repaired crack going up the outside of the left side fuselage wall and the subsequent slight “creasing” of the inside fuselage wall glass (running nearly entirely from the top of the fuselage down to the bottom edge).

Before actually laying my 2-ply UNI pre-preg setup, I refloxed any seams and edges on the front seat & instrument panel to fuselage junctions.  I laid up the 2-plies of UNI (crosshatched at opposite 30° angles just like the original layup) and then peel-plied the entire layup. Continue reading →

Now that the fuselage side crack is repaired and the micro has cured, it’s time to move onto inserting the foam pieces to repair the fuselage side walls.

The first step in all this is to PROTECT the foam!  From what?  You may ask.  Well, both micro and flox are wonderful stuff, as is their base component: epoxy.  But all of this stuff should be minimized on any bare foam pieces that will later be glassed.  Layups are finicky endeavors and fiberglass likes sticking to fresh, clean stuff… not old nasty crusty dried up micro, flox or epoxy.  So, to protect the surfaces we tape right along the edge of the foam on each side of the micro seam.  From there on, we just need to ensure we try to not ding or crush the foam, although dings are easily remedied with?  Yes, Micro!

To ensure that the inserted foam lines up evenly with the existing fuselage sidewall, popsicle sticks are placed every few inches to keep the surfaces on each side of the micro junction even. Continue reading →

In preparation for starting back into my airplane building, I needed to get some epoxy.  My initial research held true and I was able to buy a lot of MGS (for some reason MGS in Germany is sold under the name Larit) epoxy and hardener for a LOT less than in the States.  And best of all:  NO SHIPPING FEES!!!

Today I went to Stuttgart and picked up 6.6 gallons of MGS 285 epoxy from the “local” epoxy vendor, Lange+Ritter.  Larit has the same specs as MGS and follows the same numbering scheme.  Luckily I had my documentation from the US in case I needed to double-check any info, considering all the labels are in German.  Also, picked up two 1.3 gal jugs of the slow hardener and one 1.3 gal jug of the fast hardener.

The first step in the fuselage repair is to make foam inserts to replace the crushed foam on the fuselage.  Like I said above, luckily I brought a bunch of spare foam with me.  The one slight issue I have with the foam is that I don’t have any pieces long enough, so I’ll have to micro two pieces together.  No worries . . . let the repairs begin!

Welcome to Germany!

As for the actual build in Germany, I’m starting out with a deficit: I didn’t realize until after I unpacked my fuselage here in Germany that the movers had cranked down too hard on the cargo straps and cracked the lower longerons (stringers) in two places and crushed the foam in the lower middle section of the fuselage (I had briefed the moving crew on how to pack it and tie it down… for some mysterious reason they didn’t listen).  So, while April was a month of preparations, May will be a month of fuselage repairs!