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I use an old Astro Flight nicad varaible rate charger to power my hot wire cutting bow. Works really well and can be found at swap meets for next to nothing. Mike |
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Last edited by CarreraGTSCS; Sep 21, 2020 at 07:00 AM.
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Now that the wing cores are done, I decided to tackle the fuselage, just so that I can see the whole picture soon. First step is to print out the plans, 18 pages, and assemble them, Next, I’ll start cutting foam.
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No, it will only be in two sections - front and rear, about 50+60 cm each, and each section split in two sides. Cut out with a normal saw and then cut/sanded/sculpted to the right form. The internals will then be cut out with a hot wire cutter.
Nose cone will be done separately and so will the tail gunners turret. I hope to make the nose cone such that it can be pulled out with the battery on a sliding tray inside. |
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Colorized photo of 617 squadron survivors...
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Yesterday I got one side chopped out of the foam. At the beginning it does seem a bit daunting to make that square box into a nice rounded Lancaster fuselage side, but once the two beveling cuts are made, it really is simple - grab a piece of 60-grit sandpaper and work your way through it. Takes about an hour for each block.
Pro tip: keep the vacuum cleaner close at hand and make sure you have extra filter bags for it Planning to do the other side this weekend and then add balsa formers at the ends as well as a keel where the two sides join. I still have to figure out exactly how to anchor the wing spars in the foam, but the general idea is to cut the inside as a square, such that some sort of plywood can be attached to the inside, let the spar go through the ply and in that way spread the load. Battery tray then slides in between these two inner plywood sides and pulls the nose cone in place. |
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Getting there - most of the major parts are well in progress!
Fuselage weight is 276 g before hollowing it. |
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How are you going to cover the fuselage ?
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Good show Jorn!
And with all that dust we have another use for those face coverings we now all have to hand Its an ill wind .... What weight of glass / layup are you thinking of putting on the outside of the fuselage? Alec |
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Last edited by balticS2; Sep 26, 2020 at 05:45 PM.
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The fuselage will get a treatment of 40g/m2 glass and epoxy - and at least a top and bottom keel to add some strength.
The irony of the masks But actually I didn’t wear one here. The foam dust is coarser than balsa dust and prefers to cling to the table instead of floating around the room. It may look very dusty, but in fact it is very living room safe |
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"The foam dust is coarser than balsa dust and prefers to cling to the table instead of floating around the room. It may look very dusty, but in fact it is very living room safe".
Wow, I've just checked back through this thread and you are working on the living-room table!!!!! You sure have a gem quality wife there Jorn. |
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Weight is pretty good for a model that size. Lots of models end up with airframe weight being 1/2 the flying weight.
So, you are having a center keel on the balsa halves or fore and aft fuselage have balsa bulkhead formers where they join? It makes a huge mess but John Morgan, RIP, would use a wire wheel in a dremel tool to hollow his fuselages. Creates a snowstorm of white foam pieces / powder. Looking good, shape is coming together. |
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The general fuselage approach is:
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Yes, weight looks pretty good right now, but estimated lower bound is still 3500 g. That is with approx. 500 g landing gear incl, mounting plywood, servos and wheels, approx. 450 g battery ... and so on with tail gear, feathers, motors, servos, battery tray, glassing and paint etc.
Unfortunately experience has shown that I end up with a, hmm, “fudge factor” of about 25% ... so it is more likely to be at least 4000 g. |
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