Indoor version of the vintage ACRO Special - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 03-24-2019, 10:44 AM   #11
Dutkoski
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Re: Indoor version of the vintage ACRO Special


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Turtle deck bonded in place and sanded. Turned out quite nice.

Decided to make a vacuum form mould / plug, for the access hatch and canopy. It's a single item since there will be no actual cockpit interior. The canopy section will be simply painted. If the model flies exceptionally, then perhaps I'll make a clear canopy from the same mould and insert it from underneath.

The mould is made from pine, sanded to shape. The canopy section was shaped using the Dura Grit Mushroom Shaping Wheel, with the 60 grit version, took just a few minutes to rough it out.

I used automotive body filler to attach the canopy section to the forward deck and also used it to blend in the gaps. Bonds is my best friend for doing this as it adheres very well to wood and sands ver smooth blending in the gaps.

Once I fine sanded it to 150 grit finish, I apply a generous coating of polyester resin. This gets sanded also with 150 grit sand paper. If you do not put a coating on the wood to seal the surface, then the hot plastic will really grab hold of the mould. Seperating them after moulding can be quite difficult. Also, for opaque plastic, it is sufficiently smooth. But, for clear canopies, you should go up to 320 grit wet sand paper.

Well, that's it until May, my wife and I are packing the suitcases for our trip to California. Have a great April guys.
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Old 03-25-2019, 06:40 PM   #12
DarthAnal
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Re: Indoor version of the vintage ACRO Special

Glad to hear that you and your wife are taking some quality time in a warm climate. Enjoy your trip!
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Old 06-10-2019, 05:10 PM   #13
Dutkoski
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Re: Indoor version of the vintage ACRO Special

Going to finish this project up now. The master plug had been shaped and two coats of polyester resin applied. Then sanded down to a 220 grit finish. I then attached stand off edging that had a slight positive angle to the bottom edges and both the front and back. These are needed so the hot plastic will get drawn down past the bottom and ends of the master plug and a crisp edge will be formed.

After trimming, the hollow and light hatch section was test fitted and the results were satisfactory.

The balsa interior structure will get cut and fitted, then with the structure secured to the fuselage, the formed plastic will get bonded to the framework.

I could also vacuform a clear canopy from the same master plug and cut away the white styrene. The canopy would then be inserted from the inside and bonded in place, but then I would need to make a cockpit and pilot, all creating weight, so I think I'll just leave it with a painted canopy.
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Old 06-11-2019, 07:44 AM   #14
Dutkoski
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Re: Indoor version of the vintage ACRO Special

In preparing for adding the 3/4 oz cloth, I coated the wings and fuselage last night with a skim of my favourite filler material ....... general purpose drywall compound. Being only slightly heavier that balsa filler for the amount that is left after sanding, it works great. Adheres to balsa and foam and sands really easily.

So, this morning I sanded both the wing and the fuselage using 180 grit sand paper glued to a foam sanding block.

Very satisfied with the results. The main access hatch was framed up and fits pretty nice. Put it on the scale, all of .9 oz. very light, yet strong and ridged. It's just over 12" long and 1.5" wide.

Today's task, fitting in the retracts and main gear. Making the wing hold down and the main hatch hold downs. I think the hatch will be secured with a dowel at the front and a couple of small magnets at the back, keeping it simple.
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