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Old 11-26-2008, 10:03 AM   #1
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Polyurethane Foam

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I am building a glider with a fibreglass fuse. The plans want me to back-fill the tail with foam. I have tried the spray-in stuff but I can't make it work. Everything behind the outer "skin" that forms stays a liquid. An earlier post had suggested a two-part formula sold by tower hobbies but that has been discontinued. Is there anywhere else you can get small amounts of a two-part polyurethane foam? Or is there another solution to back-filling the tail?
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Old 11-26-2008, 10:27 AM   #2
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Re: Polyurethane Foam


You may want to give "Gorilla" or any other Polyurethane glue (such as Elmer's Probond at Home Depot etc.) a try. You put this glue (kind of like corn syrup) in place then "mist" it with a spray of water. The water activates it and then will expand a lot. You should test the expansion on scrap to see how much it expands first.

I would suggest you put masking tape anyplace, or joint, the glue may leak out, this makes it is easier to clean the extra expansion off. The glue usually is finished expanding from 1 to 2 hours and is still sticky and can be wiped off, but is messy. After that it sticks so well that it is almost impossible to get a surface completely clean unless you have protected it with masking tape.

I have also used the aerosol can of spray insulation from Home Depot, it comes with an extension tube to make it easy to get into the fuselage. I used it to put the foam into the tail of a coroplast plane to stiffen the tail - you may want to try this as well. There is a couple of different types so make sure you read the lable to get the one with maximum expansion.

Hope this helps.


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Old 11-26-2008, 07:28 PM   #3
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Re: Polyurethane Foam

YOu need to watch just how much of this stuff you use. I've heard a lot of stories about people being woken up at 4 am by the loud "bang" of fuselages/floats/etc. exploding because it expanded much more than they thought.

Personally, I'd consider it a poor design if it requires this. They should have added an extra layer of FG against the bias instead.

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