Re-starting Avro Arrow build - Page 18 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 03-13-2016, 10:34 PM   #171
larry baraniuk
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Zero Launch System


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I still plan on bungee launching my twin 70 mm edf because the airfield I fly on is hard on landing gear. I think that landing gear is another a hobby in itself.
Something that I'd really like to make a project is to build a Zero Launch system. Anyways , here's some pictures of the original concept.





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Old 03-14-2016, 12:38 AM   #172
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Re: Re-starting Avro Arrow build

Ok, so I'm a kid at heart, I couldn't wait until tomorrow. So, steel spatchula and lots of pry sticks and started seperating the shells. To my surprise, the top half came off almost too easily. It is about 1 1/2" deeper than the bottom half and figured it would be the harder side to remove. So lifted it off and checked it out. The mould turned out beautifully, the details and panel lines are all perfect, couldn't be happier.

I attached legs to the front and the rear of the plug so the mould was off the table. Then with a wooden block up against the plug, began tapping the block with a hammer. Went around three times before the mould dropped away. Again, the mould turned out great.

So tomorrow, I guess I will hose the moulds down with the garden hose and clean them up. The mould, unfortunately, isn't quite done. I now have to make the huge access hatch it the top half. The hatch will be big, I hate those tiny hatches that you cannot get your hands into easily.

Here are some pictures
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Old 03-14-2016, 12:40 AM   #173
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Re: Re-starting Avro Arrow build

Getting the bottom half off the plug.
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Old 03-14-2016, 12:42 AM   #174
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Re: Re-starting Avro Arrow build

The bottom portion of the mould
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Old 03-14-2016, 12:44 AM   #175
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Re: Re-starting Avro Arrow build

LOL... little setbacks, but looking really good.
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Old 03-14-2016, 01:28 AM   #176
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Re: Re-starting Avro Arrow build

Very Nice !
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Old 03-16-2016, 04:10 AM   #177
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Re: Re-starting Avro Arrow build

Quote:
Originally Posted by Dutkoski View Post
Go bigger, with the power the newer 70 mm fans produce you can get away with bigger, just keep the model as light as possible. I see your model is basically solid foam, you get alot of extra weight doing it that way. What are you using as a finish, is it epoxy?
.
I put 2 layers of light weight fiberglass cloth with aeropoxy and then I melt the foam



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Old 03-16-2016, 09:52 AM   #178
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Re: Re-starting Avro Arrow build

I remember reading about that style of building in a British magazine or Jet International, a chap built a large turbine powered Supermarine Swift I think. Did basically what you did then poured gasoline or thinners inside to melt out the foam. It was a fairly big model, so what a mess that would have been.

I rather do the scratch builds the way I do them as I can control the amount of foam easier. Plus, I just like building that way. I have all tge hot wire tools too, so making sheets of foam any thickness, down to just a couple of milimeter thick is very easy.

But, when it comes to building master plugs to make fiberglass parts, it's hard to beat wood. I had a friend who used foam to make the master plugs, but he told me the issue with that is the small dings that occured when moving it around.

My problem at this moment is what to do with the master plugs once the moulds are made. I still have all the master plugs and moukds from all tge models I designed and manufactured over the years, my garage and other storgae soace is filling up fast. I just can't bring myself to cut them up and get rid of them and I won't give them away.

I'm so sentimental, huh.
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Old 03-16-2016, 11:47 AM   #179
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Re: Re-starting Avro Arrow build

John - If I may ask a question...

I have a multitude of skills and talents that I have picked up over the years - but making Moulds and applying fiberglass to them is not among any of my experiences.

Just How did You gain the talents needed to do such quality work on making up Fiberglass projects on this Scale??
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Old 03-16-2016, 03:00 PM   #180
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Re: Re-starting Avro Arrow build

Really,you just start,and surprisingly,you get skills and experience,after a while.I was a patternmaker for 30 years,so making moulds became a fact of life,but I had to start,in order to finish.I made wooden plugs,because it is much easier to control the finished mould.Nowadays,you can have the cnc'd mould in a quarter of the time it would take.
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