|Oct 20, 2013, 09:21 PM|
This thing's all but cooked
It was a pretty good weekend, with lots of little problems sorted out.
The biggest job was getting all the right holes in all the right places and sizes in the cowl. The muffler pipes proved particularly tricky to get right. I'm pretty happy now that the cowl is finished and ready for final sanding and priming.
The next job was to sort out the muffler tank pressure. I couldn't get a hold of a tap small enough so after drilling about the right size hole into the muffler box, tried to tap in the pressure nipple from the standard muffler. Just as I thought I was winning, the thing just snapped off. Why I didn't see that coming from 17 miles away I don't know. So I've inserted a bit of fuel pipe instead and will atempt to solder it in place, although I have no idea what the muffler is made of.
The needle valve and throttle connection brought their own problems. The needle required a small hole as it was rubbing against the cowl. The throttle arm is hiding behind the muffler box, so I scratched my head trying to figure out how to connect it. In the end good old music wire was really the only solution, bent into shape to get over the muffler box to the servo. I've found the ideal servo mounting spot, and that will be the next small job to do.
All that is left then is to mount the fuel filler and the battery switch/charger. The fuel valve I will mount to the firewall somehow and have it poking out through a small hole in the cowl. When the tank is full, fuel will simply run out the exhaust, no need to disconnect any lines to prevent flooding. It took me a while to come to that realisation.
There is only one reasonable location for the switch, and that is above the wing in the side of the fuselage. I'll just have to disguise it as best I can.
Once these few tasks are sorted out, it'll be time to apply the finish.
|Oct 29, 2013, 06:05 PM|
Construction is now complete, with a couple of finishing touches remaining for when the time comes. The last month or so has been a bit of a slog to sort out all the mountings, but we're there finally.
I don't think I have a picture of it yet, but the cowl has had about 600 coats of primer from a spray can and it looks pretty good. Not perfect, but good enough. It has had one more hole added in the side for the fuel filling nipple.
The wood finishing has begun in earnest. There is a lot of sanding and filling still to go and I'll be taking my time to get this right.
Now, as far as colours and finish go, well, I still haven't decided on the final schema. There hasn't been enough time to do the research properly, but I will get around to it soon. I have made one decision though, which is that I'll be going for an all metallic finish (apart from the cowl).
|Oct 31, 2013, 08:11 PM|
It's time to fill the shed full of dust. Given the amount of wood and complex shapes in this model, filling and sanding is going to take a lot of filling and sanding.
|Nov 12, 2013, 09:37 PM|
The industrial side of the building is just about completed. Last night I finally gave the model a coat of Eze-Kote sealer and over the next couple of days will apply filler coats.
I'll also be focussing on getting the ailerons and elevators permanently attached, but more on that later. In the meantime I've attached a couple more shots of the model as ready for sealing.
|Nov 20, 2013, 05:30 PM|
No, I haven't been slacking off. Been quite busy lately, and anything I do on this model at the moment produces very little for the eye to register.
So far the wood has had about 3 coats of resin plus micro balloons. This will do for most of the surface, but in some areas the grain is heavily lifted and will require a bit more yet.
The really time consuming part has been attaching the elevators. There has been something of a tragi-comic curse attached to this task which has really tested my patience, and all because I'm doing it out of sequence.
Be warned: make sure you have the elevators attached before the tailpost goes on. I was under the misconception that I could still detach the dry-fitted elevators at this stage of the construction, but it's not so, and I have suffered accordingly.
Basically the inside hinges weren't coming out, so I've had to get covering onto the adjoining edges by trying to work around that hinge, and within the confined space of the elevator and tailplane - about 1cm maximum play at each end.
This has not been fun, and it has chewed up a lot of hours.
But the tragedy doesn't end there. After finally getting it to a reasonable state of acceptability, I proceeded to glue in the CA hinges. It's the first time I've used these hinges (and I must say they are excellent), and I overestimated the retardant time. So I had a slight delay between gluing the first hinge and the next two, and of course the first one set before I had got it into its final position, which meant I had slop in the end of the elevator.
I have to laugh when I think about it. Slicing through the hinge with a knife and trying to get it even with the surfaces; trying to cut a new hing slot with the elevator attached by the other two hinges; and then (and this was the best part), trying to slide a new hinge into the new slots. Goodbye two hours of precious time.
On the up side it seems to have worked, although it is not perfectly positioned, and I did only minimal damage to the finished surfaces in the process. So I think I got a bit lucky in the end, and the elevators are now attached and working. Needless to say I did the other side correctly.
Next up will be the aileron attachment, and then I can finish covering this thing. Thank goodness the ailerons are still detached!
A quick word on how I'm doing the finish. Rather than use a silver paint, which to my mind always looks a bit ordinary, I'm going with the real thing and using an aluminium foil covering. This will require a bit of extra work, but I think it will be worth the effort. I've looked at the products on the market, and don't really get it. They cost a fortune because they have a glue attached to them, which looks like it will only make the job more difficult. They also seem to be quite thick and heavy. And did I mention expensive and very hard to obtain?
So after running a couple of tests I'm going with plain old kitchen foil, which is remarkably thin, exactly the same material (ie - metal), extremely cheap, and of a very high quality. It happily attaches with any sort of glue, and I am just about to try it with the resin as this seems to be the most sensible glue.
The edges are going to take a lot of work to get the curves looking ok, but the main covering should be pretty straightforward. My technique will be to mask of each area to be attached, cut the foil to size using a paper template if necessary, smear the glue onto the wood and lay on the covering. I will probably glue one corner first and let it dry so that there is mounting point for smoothing it out. Soft balsa seems to work nicely for the smoothing. The elevator area was particularly painful because I had to apply the glue directly to the foil, which was a handling nightmare.
I'm going to be a busy with work the next couple of weeks, so progress will be slow.
|Nov 26, 2013, 09:02 PM|
I've found my colour sheme. It's a good match for what I had in mind, and has quite an accomplished history.
Many will recognise it as part of the USAF National Museum collection, painted in the markings of Col. Joseph Laughlin, commander of the 362nd Fighter Group, 9th Air Force.
The only slight detail embellishment is the tail fin extension, which I don't have. But I can live with that. I'll consider adding it.
I've started foiling the aileron area and am stoked with the results. Will add some photos of the process later.
|Nov 27, 2013, 05:52 AM|
Haven't seen any activity from you for a while - how's yours going?
|Nov 27, 2013, 04:15 PM|
Hi Phil the reason is simple i have been very busy at work , and don`t have much time off ,i also have decided to postpone my P47 build , it`s glow powered and i will need some more time to think everything through do not want to rush it, but i will come back to it later in stead i`m having another go at P40 Kittyhawk it`s my second plane i have built but crushed it on maiden . Hopefully this one will have much more luck.
I also have made some progress on my Citabria Pro
|Nov 28, 2013, 12:31 AM|
Here is the method I'm using to attach the alfoil.
1. Cut the sheet to about the right size with a sharp No.11.
2. Trim and shape the piece to approximate the contours.
3. Mask off the glue area.
4. Spread the resin on.
5. Apply the foil, pressing it on securely.
6. Cut it along the masking line with the sharp blade.
7. Remove the excess foil, pulling it away.
8. Remove the tape.
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