Understanding EPS Foam

It is not uncommon for budding hobbyists to be afraid to ask questions that they feel they should know. This can be especially true when you are speaking to experienced hobbyists EPS Planewho can at times seem to be speaking their own language. You will often hear acronyms used as frequently as actual words and when you are in a full discussion or listening in, it may be difficult to even know where to begin asking questions. One of the acronyms that could be useful to know, especially in regards to your foam R/C aircraft, is EPS.

CAEPS stands for expanded poly styrene. This type of foam is much like your beer cooler type of foam. It is extremely light weight and is great for producing a nice surface for moldings in things like the wings and fuselage. The beads are very small and pack together tight to produce a nice flush looking surface. The downside to this type of foam, however, is that you can’t just use a regular CA type of glue. EPS requires a special, foam safe glue. Also, it is very prone to dents and dings, or “hangar rash” as many hobbyists call it. So, on the one hand, you have a foam that is not very resilient or durable, but on the other hand, this foam is great for low weight impact on the model, along with providing a nice overall look.

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6 Responses to Understanding EPS Foam

  1. Pingback: Merry Christmas, Understanding Foam, Trainer Planes, Prop, eRC Inside, Stampede 4X4 | Hobby Express Blog: Your Home For The Best R/C Topics, News, And Information On The Web

  2. Ron Laisle says:

    Soooooo, was there supposed to be a point?

  3. Ron E says:

    Great, but tell us “the rest of the story”.
    How many foams are used for model planes? What are their characteristics, good and bad? Which ones to avoid? Are some hard to get?
    That would really be helpful!

  4. Jim Hinton says:

    Good basics article, it would be nice to expand on this and cover the other types of foam commonly used in RC.

  5. Tom Edwards says:

    It also breaks very easily limiting is use to maybe thick reinforced fuselages

  6. Darren Graham says:

    I agree, its a good starter article, but what about all the other acronyms that you mentioned in the beginning? There are many types of foam and I wish I knew more about them. Also how about a an article about electric aircraft motors? All the descriptions and metric designations make them hard to compare.

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