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Archive for January, 2012
Posted by Tsavah | Jan 29, 2012 @ 03:31 PM | 8,991 Views
About a year ago I came across a thread that had a post that mentioned using the kitchen oven to "bake" a fan fold foam (FFF, also known as Blu-core) wing. The model wasn't going to be all that big and would normally be classified as a small park flyer. It was also going to be a design with a short, wide wing with an elliptical shape. I was thinking at the time the design was a bit small for what I was wanting, but the idea a simple flat wing shape could be heat (thermal) formed into an airfoil shape caught my attention. As time passed I continued to look for threads that discussed the details of thermal forming FFF board into a curved shape, be it a wing or fuselage. A few months ago I got the idea to cold-roll various foam board types into a tube for a number of projects I had in mind. Since I kept finding more posts discussing thermal forming FFF, and a few that mentioned other types of foam board, I started looking for the methods used. I needed details about the process, the temperatures used, any devices, or jigs constructed for the purpose, and what advantages or disadvantages the end result might have.

The details are; bake the FFF at 200 degrees F for 20-30 minutes and the foam will develop a hardened skin, giving the finished product stiffness similar to Depron. If the foam has low spots, some, or all of the low spots will disappear, or be harder to notice. The soft spots in a sheet of FFF will stiffen and the sheet will have a more uniform
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Posted by Tsavah | Jan 01, 2012 @ 08:03 PM | 6,489 Views
I woke up thinking it would be a good idea to make a thread dedicated to a series of foam fliers (all electric builds) that are as easy to build as it can possibly be. The focus would be helping a new person interested in building their first foam, all electric flyer of the larger park size. There are plenty of threads dedicated to smaller park flyers, but I'm not finding many that use 1/2” insulation foam. I think it is possible to build 36” or larger wing span flyers without a lot of expense, relatively speaking. Since most of the larger park flyer kits offered to beginner RC pilots tend to be priced in the $120 - $250 range without radio gear, the first project build should be less. If insulation foam products are used as the basic building material, the goal of a cheap, easy to repair first RC flyer should be obtainable for less then $20 in foam board, glue, and other miscellaneous materials. Since some hobby shops are offering a motor, esc, propeller, and sometimes a LiPo battery pack as a package, it should be much easier for the beginner to start off with a working system and make fewer purchase mistakes. As most of us will remember, the first expensive purchase will be a radio, unless we can make a deal with someone that has one they are no longer using.

One issue that will make it difficult to keep the initial purchases low for a first time RC builder/pilot is the investment decision about a battery pack charger. I find it hard to recommend a
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