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TOPIC: Aermacchi AM 346 for TSP L-2

Aermacchi AM 346 for TSP L-2 1 year 1 month ago #1906

  • Terry Kidd
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]Here's the first chunk of the 3D printed version.



Hopefully I'll get something printed next week.
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Aermacchi AM 346 for TSP L-2 1 year 1 month ago #1908

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I progress slowly with my 'low-tech' M-346. The air intakes with the bluefoam side cheeks were glued in place with 'UHU-POR', and after a lot of filling with lightweight filler, shaping and sanding, sanding and shaping, they f ended up looking 'not too bad'.



It took a long time to get to this point as I wanted to ensure the intakes matched each other (not easy) and were not too out of character of the 'real' M-346.:ohmy:

This then leads to a consideration of what to do about the painfully-sounding 'rear end treatment. Initially, I thought a simple 1.5 mm balsa profile (as per Rob's plan) would be OK:



But it's all too obviously out of keeping with the rest of the model. :woohoo:
Given my new expertise with bluefoam, I carved a '3D' insert:



This weghed 0.3 grams .... not too bad, and it looked not too out of character in place:



Whether it will withstand the hot TSP L-2 exhaust remains to be seen ..... or should I fit a Jetex 50 instead?

Decisions, decisions. :unsure:
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Aermacchi AM 346 for TSP L-2 1 year 1 month ago #1909

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I'm fairly sure the exhaust will melt the foam somewhat unless you line the front slope with balsa as a down thrust plate. Perhaps do a test with a dummy rig to find out.

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Aermacchi AM 346 for TSP L-2 1 year 1 month ago #1910

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Thanks for posting the view underneath Roger. It does look good. (I'll need to copy this for my 3D printed version.)

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Aermacchi AM 346 for TSP L-2 1 year 1 month ago #1911

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Hi Terry,
Noting Howard's apprehensions that hot motor exhaust will melt foam plastic (true!) I sorta expected your 3D printed M-346 to be 'fully formed' (with no cut out for a motor) and the motor itself to be carried in a substantial 'weapons pod' under the model and well away from the vulnerable plastic surfaces. Here's Howard's foam F-4 Phantom:



the pod with the motor (a Rapier L-2) is mainly balsa and lined with foil.



This arrangement worked well:



I'm sure Howard will be happy to supply further details. B)
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Aermacchi AM 346 for TSP L-2 1 year 4 weeks ago #1913

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As a lot of the M-346's fuselage is bluefoam, my preffered finish of 'two coats diluted cellulose dope rubbed down followed by a covering of tissue (also applied with traditional dope) was not an option. Instead I brushed on a couple of coats of Deluxe Eze 'Sand 'n' Seal (with lots and lots of rubbing down with 240 grade carborundum paper) and stuck down the tissue with Eze dope diluted to 40% with water.
It all went OK (though I much prefer the old dope/sanding sealer) and took two thin coats of thinned acrylic paint well. :)

Time to glue in the motor mount and stick protective foil to vulnerable surfaces.





TSP L-2 motors are of course larger than Rapier L-2s, but that can't be helped.

The canopy is as characteristic of the M-346 as the prominent intakes, so I marked it out carefully (a couple of times :woohoo: ) and applied the base colour.



More later ...... :huh:
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