#21
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Nose segments
The aircraft engine air intake is in the nose.
A little aerodynamics for you guys: The air entering an engine has to be treated right or else all sort of separations, boundary layers and inefficiencies occur. So the simplest way was to wrap a nacelle around it and sling it under the wings like an Me-262. That OK for a twin engine configuration, but for a single engine it has issues. A example of a single engine with a nacelle is the Heinkel He-162 with the engine on top. The problem with an engine on the top is that if the pilot has to jump out ( there were no ejection seats back then ), he would be sucked in or hit on the way out. Engine pod on the bottom also had issues. That placement made a good vacuum cleaner ...... So for a single engine aircraft, you had either a nose intake, or side intakes. There are examples of both. The nose intake being very simple however meant that the pilot had to be on top of the air duct. Also, you want to keep that duct short. Therefore you got a tubby and pudgy looking plane. Later on when further developments of the jets came out, the pilot sat in a tub and the air past on either side of the cockpit like the Mig 15 / 17 / 19 / 21 or the Suchoi 7/9/17/22 series planes. Also the early Dassault Ouragan and Mystere ( must have been noisy ? ). Sample of intake routed around the cockpit is this Suchoi ( taken by me at the Cracow aviation museum in Poland. The round cone in the nose was a fairing to house a radar ( the TA-183 did not have one ). OK, done with the lesson. Here is the build The extreme nose is a grouping of conical like sections. I glued them first. Then there is a rounded bulkhead in the nose. Its center is removed for the intake sub assembly. I decided to glue the nose minus the intake sub assembly to assure a better fit. Once dry, I glued the intake. There is a very thin ring that is added to the intake. The inlet will need some treatment later to make it smooth . For now her it is. Isaac
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#22
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I'm impressed how you and the kit manage to get the courves so smooth... looks very good!
BTW: doesn't the intake cone also control the airstream into the turbine? Can be wrong, but I remember having read that at least on some planes the cone can move for- and backwards to narrow or widen the open area and influence airspeed inside!? Best regards, Thorsten |
#23
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Quote:
Some engines that you see like the Jumo 004 on the Me-262 or the other engines had a static cone ( looks like a spinner, but did not rotate or move ) on the engine itself. This was a fairing for the starter as well as a smoother intake at the engine compressor face. None of the Luft 46 aircraft with nose intake and the engine in the back had that bullet nose to control flow. Isaac
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#24
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Thanks for the claryfication! :-)
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#25
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Vertical tail
The tail is the prominent feature of this aircraft. It sits on top of the rear section right above the engine. It slopes aft very sharply and supports a T tail horizontal surfaces. The reason for the highly swept back tail was to get as long of a moment arm for the elevator instead of elongating the fuselage itself. In reality, the plane looked much faster than it could fly being powered by the early jet engines.
Assembly There is the internal framed structure that is mated to the tail skins. The skin comes in 3 main sections that make the fuselage to the vertical fin fairing. I pre-mated the sections and then started gluing to each other ( not the vertical fin yet ). I decided to mate the forward edge of the fairing to the forward frame that will mate with the aft fuselage section. I then glued it to the frame. Then I added the vertical fin. The rudder has internal frame and soft wire to act as rudder hinges. Once complete, I drilled the holes in the fin to insert the soft wire. Then attach the entire assembly to the back of the plane. The fit was reasonably well for such a complected fairing. Note: I would strongly suggest this method over ones in which the frame is glued to the aft fuselage and then you try to skin it over. Cheers Isaac
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#26
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Wings
The wings on this aircraft are shoulder mounted, but not on the very top like the Soviet La-15. They will need to conform to the curvature of the upper fuselage.
Sub assemblies The sub assemblies consist of one piece wing skin that is bent around the leading edge and mates at the trailing edge. Then you have the aileron and wing tip. The structural support is a wedge like center section that slips into the fuselage cut out. Each wing spar is a box construction with additional front and back flat stiffeners. I decided to glue all these structures onto a cardboard. When assembled and glued it makes for a super strong assembly ( make sure it is flat and not warped. Start by gluing the wing skins joining at the trailing edge. I decided not to cut out the flaps as it just added to the complication. However, dropping the flaps is OK if you wish to do it correctly. I purposely did not glue the spar yet since it looked kind of too long. I glued the inner wing rib sections only. There is a cant to them as the fuselage slopes away on top. When dry slip in the spar and stop where the inner rib matches the wing skins inboard. Then cut the spar to size, leaving room for the outer rib. Now you can glue the outboard rib to the wing outboard. When dry, then check the wing spar to see if it matches. Then glue in place ( make sure it is inboard of the wing skins so you get a good fit with the fuselage. The wingtip assembly is over-simplistic, but does the job. Ailerons have an inner stricture and also soft wire that act as hinges. The mating aileron bulkhead is also glued onto cardboard, cut and then drilled to accept the soft wire hinges. All fits well. Cheers Isaac
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#27
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Horizontal tail surfaces
The horizontal stabilizer sits on top of the vertical fin in a T shape form. The surfaces do have a noticeable dihedral.
That is done with the internal ribs and spar structure for each side. They mate in the center to form the correct dihedral. The parts are all easy to make and are self explanatory. They consist of the frames, external skin/surfaces, elevators and soft wire for hinges. Pictures here Thanks Isaac
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#28
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Very impressive work. You are really coming along on this. I like the flaps. I look forward to seeing it all come together.
Jeff |
#29
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Tail attached
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#30
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Wings attached
The wings are dry fit first. All was well and no adjustments needed.
The box spars fit into the center section wing box and provide strong support ( I used cardboard ). Once the wings are glued, attach the wing root fillet. Isaac
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