Today I sanded the sides of FU-ST-9, the balsa block at the very back, seen in the image below, to run smooth along the outer edges of the pieces it is glued between. I also glued some balsa pieces under FUH and to the back of former 10 (F10) to provide some additional support to the joint where FUH buts up against the former. Medium CA glue was used for this task.
I then moved on to prepping the side of the fuselage for the first balsa sheeting by making sure there were no glue gobs present and sanding down any bumps. We then lined up the FU-SH-2 piece of balsa, which is 51 inches in length of 3⁄32” x 4″ balsa to see how it’d fit with the sheet flush to the back of the fuselage. This sheet wasn’t quite long enough to reach to the front.
Wednesday I made more headway on the build, working together with Peter. First we removed the balsa block from tail that was temporarily glued in place to help support FUH. Then we moved on to this sessions main goals.
From a session by myself I had already prepped the FUBs to be glued in by sanding them and continued this session by ensuring the fit of FUDA (landing gear block) by trial fitting it with the FUBs in place and doing some directional sanding to get the outter edges to flow with the curve of the fuselage. During all this trial fitting we do have the firewall (F1) clamped in place, but not glued yet.
For the FUG pieces of 1⁄4” x 3⁄8” hardwood, to be the servo mount for the rudder, elevator and throttle, I placed it in and made a line with a pencil to mark the length and then sawed it off and repeated for the second piece. The measurements in the instructions are to make it 35⁄8”.
Once we were happy with how all the pieces (FUBs, FUGs & FUDA) were going to glue in place I mixed up a batch of glue. I started by:
Peter came over this afternoon and we made progress on building the aircraft. Today we completed Step 3 and made progress on Step 4. If anyone is curious, for the fuselage there are 11 steps total of which Step 10 is a biggy.
Peter brought over a bunch of balsa block scraps we could use for positioning/stabilizing the doublers (FUAs) along the balsa stringers. We started by figuring out what we would need and where, including heights, and making them. Used some CA to glue pieces together, then cut them out and sanded so they’d fit flush to the sides. You can see the pieces we made in the featured image at the top. We also slid some pieces underneath the stringers, as they are raised off the surface, to ensure the balsa stringers are snug to the top of FUAs.
Oh yes, technically it is the top as the fuselage is getting built upside down, encase you’re wondering.
This morning Peter came over and we tackled the remaining formers. We were very pleased with how the previous session set.
We started this session by completing Step 3 of the instructions; I use that term loosely with this build. The final result can be seen in the featured image above. I mixed up a batch of 30 minute epoxy and started with placing glue along the edges of former 5 (FU5). For all the pieces I avoided placing glue along the bottom notches as at this point we did not want to glue the doublers (FUA’s) to the balsa stringers. Once that was done we lightly clamped the piece in place.
Next, I placed glue along the edges of FU6, and during this process realized I never placed glue along the front and back of the tabs sliding into the doublers so backtracked and did that for FU5 and carried that process through to FU6 and onward as want to make sure there is glue on every surface that is in contact with part of another piece. We then lightly clamped FU6 into place. This procedure was then repeated for FU3/4 and FU2.
Yesterday, Peter was over and we got to work assembling the fuselage by determining what we can get done in which sessions. What we essentially got done this day was Step 2 (minus installation of former 10). I did start by sanding the excess glue off formers 3&4, previously glued together, drilling out the wing dowel bolt holes (so the dowels will fit through nicely), and cutting out the excess glue from the three slots in the top of the formers.
In order to get the back formers glued into place we had to assemble the formers (except the firewall F1) and doublers at the front as well, clamped into place to aid in determining spacing of the back formers. I marked the centers on formers 7 through 9 (F7-F9) using my centering ruler. The balsa stringer is elevated off the table when slotted into place in the doubler so we used some excess 1⁄4” x 1⁄4” balsa along with an excess 1⁄8” ply piece wedged under the stringer near the front (in the image below) ensuring everything was flowing from front to back correctly. I did have to do some very light sanding of one balsa stringer end at the back to ensure a proper fit with the tail piece (FUF).
It is neat, how if you have everything lined up and straight the placement of the formers is just where they fit (that is where the balsa stringer fits properly in the left and right slots on the bottom of the former). The diagram based instructions tell you nothing about measurements of where things should be.
Wednesday Peter came over after we both had some time to contemplate what we were missing the session before. Due to my lack of experience I would have been hard pressed to come up with the correct answer; however, Peter determined what the diagram was trying to tell us and that was…… *drum roll please*…. a scarf joint!
As you can see in the featured image above the length of the balsa stringers needed to be extended/strenghtened via a scarf joint. The way this work is you want the joint to be 8 to 10 times the length of the thickness. In this particular case we are using 1⁄4” balsa and Peter made the joint length 12 times the thickness. Which is 12x1⁄4“=3”. This is cut at an angle from the top at the measurement to the bottom at the end of the balsa stringer (repeated for the piece that is going to fit on top).
We re-pinned everything down and in the next session, hoping, we will actually glue what we trial fitted last time into place. This session, however, we did some more sanding to make sure all the pieces were ready.
To ensure the balsa stringers are flush with the outer edge of the doubler we measured and cut a 1⁄4” x 1⁄8” piece out of the bottom corner of former four so half the stringer width fits underneath.
Lastly I glued formers 3 and 4 together using 30 minute epoxy and clamped it into position, as seen in the image below.
Next time will hopefully be getting the formers and doublers glued into place on the stringers.
Yesterday Peter came over to assist with getting the fuselage situated. He brought a china marker (white) to make a straight line on the table, providing a center point for the fuselage. I marked the center on the bottom of each former so that we could ensure the fuselage is center properly.
The very tail piece was center and pinned into place at the far right (matching the diagram instructions) and two 1⁄4” x 1⁄4” balsa stringers were pinned in place. Based on the diagram I figured the spacing would be determiend by this step as they do not state how far each former needs to be from the next. When we placed all the pieces together as shown in Step 3, FU 2-10, and campled them into place (no gluing, this is purely a dry run) we determined that this was not the case and to top it off couldn’t figure out how the stringers were to fit into the slot of the front side pieces (FUA’s) as from what we could tell the outer edge should be smooth; however, the stringers definidfely protruded at the front… even though we never cut it down to size, this wouldn’t have mattered for this case. We did, however, move the ‘front assembly’ back and forth along the stringers to see if we could make sense of the situation. The side panels of the aircraft are to be 51 inches long so we were trying to get all the numbers to work out based on the lenth of the tail wheel plate at the back of the fuselage, the stringers (FU-ST-1 – which are suppose to be 377⁄16” in length), and FUA’s (believe these to be the doublers for added support to the engine block, etc. at the nose of the aircraft). We seemed to be 2″ short and didn’t think this was accounted for by the forming/fitting of the side panel to the formers.
These steps are critical and need to make sure everything is positioned correctly along the stringers and at right angles; because if it is off at the back it will only get worse as you move towards the front, each step along the way exacerbating the situation (that is potential twisting/warping of the fuselage). You can see how we left things in the image at the top. We decided to pause and let things perculate for a while. If you are not sure then don’t proceed. Will likely get some additional input from other modellers before moving forward… stay tunned.
What I did get done this day, besides contemplation and discussions around the fuselage, is gluing what appears will make up the landing gear block (FUD & 2 FUDA’s stacked on top) glued together by mixing up some 30 minute expoxy. You can see them clamped together drying below:
In conclusion, though this day was not as fruitful as we were hoping, troubleshooting/problem solving and discussing with our fellow aeromodellers is part of what this hobby is all about!
With luck, I’ll be able to make more progress later this week.
Today I made some more progress on the fuselage of the aircraft. I started by cutting, from 1/4″ x 1/4″ balsa stringer, two pieces for cross braces in former 7 which was 21⁄16” and in former 8 which was 15⁄16“. Once cut I used medium CA, placed on the ends of the balsa and top and bottom where it wil be making contact with the former.
I inserted the balsa piece into the former and pinned in place (the pins kinda seemed uncessay as medium CA dries very quickly). I did this over wax paper to minimize my chances of getting glue onto the pinning surface of the workbench. The result is seen in the bottom left picture.
Next I cut out formers 3 and 4 out of the 1⁄8” ply and sanded the exterior perimeter, except the curved (bottom) portion of FU3 as nothing will be gluing here. The idea behind sanding (to my knowledge) is to remove the laser burn and create a surface for the glue to more easily stick… also removes the rough jut outs from where I cut the tabs holding the pieces into the main ply sheets.
Lastly I cut out the two FUDA’s and removed the plastic wrap around a bundle of pieces to get FUD. The two FUDA’s are going to get glued together and then glued to FUD. Looking ahead in the instructions these pieces when inserted into the bottom of the fuselage between formers 2 & 3 are going to make up the mounting point for the landing gear, as the wires will be recessed inside… stay tuned for when I get there (Step 10)! You can see them sanded in the featured image both along the external perimeter as well on the internal perimater for the FUDA’s.
That concludes another building session… stay tuned as I plan to get steps 1 and 2 fully completed soon!
Winter is upon us again… that means it is back to building season! This build is going to take on a bit of a different dynamic as a big thank-you goes out to Peter & John for helping me build a workbench in our mudroom. I’m excited to be able to go at my own pace from home and see how well I do as it’ll be less structrued and me troubleshooting alone along the way… that said the guys are not far away if I require assistance!
Speaking of, on Nov. 17th Peter came over and graciously leant me some tools to get me started. We looked through the kit, explorered the manual, came up with a game plan as to how to approach this build and interpret the diagram based building instructions. Mr. Aerodesign approaches things differently. More thoughts on this in a future post once I have more experience.
The aircraft I’m building is an Aero 3D, which should allow me to get into 3D flight (also good for smooth flying) as the thick airfoil and oversized control surfaces give this aircraft exceptional flight caracteristics, supposedly and what I’m hoping to find out! 🙂
Throughout my posts I am going to describe the pieces as I think they are with the labels Mr. Aerodesign provides in the manual, i.e Former 7 (FU7).
While Peter was there I cut out a half dozen pieces from the two 1/8″ ply sheets to start the rear of the fuselage. Specifically formers 7-10 (FU7-10)
On Nov. 18th I gave all the aforementioned pieces a light sanding to remove the ‘laser burn’, which helps the glue stick. Need to make sure you don’t oversand; otherwise, where the 1/4″x1/4″ balsa stringers fit into, or other parts go together, will be to loose.
I skipped step 1 as it requires some gluing, but will prep those pieces and do some gluing once my supplies arrive!
Had a bout of inspiration today… thinking it is time for me to come up with a better logo design for my personal blog/website (this site).
I was thinking what are the key elements DWCR (or maybe just DR) and two words that make up the majority of posts…. aeromodeller and developer.
Now the only question is…. can I do it up myself… graphics are definitely a week point for me. Which is why my current image on the homepage is lacking a professional look and why for a side project I have no app icon for yet.