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Home of the Spodplane
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Date: 9-7-2023
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Number of Hours: 2.80
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Manual Reference: 24-09
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Brief Description: Upper strake fairings pour foam
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Over the last week:
Mounted the cowlings, and found a couple of nutplates that were off by up to 1/4", and two that were not present at all. Hmmmmm.
My strake fairings are going to be a bit abbreviated compared to the plans. I have never liked the straight line between the cowling and the canopy depicted in the plans, it just looks too 80's. [Timewarp: Seeing the actual article at Rough River in September has greatly reinforced this. I saw a couple that had done the same thing, and I heartily endorse the concept].
Make a dam out of clear coreflute and taped and hot-glued bits and bobs and dig out the pour foam. Sadly, some time since I used it last the pour foam had expired, and both parts had gone rigid! I have had it since my original 2013 parts order, and the shelf life is apparantly much less than 10 years. :)
Found a supplier in Cheltenham www.dalchem.com.au that had a propriety two part rigid foam GPF32 that seemed similar to what I had, and at a reasonable price. The bloke in the shop indicated that the large cell size and ongoing expansion I had noticed in the past was down to inadequate mixing. He said that the first 30 seconds or so you can mix as much as you like and it won't start expanding. I put a wire loop in a cordless drill and mixed the first batch for 30 seconds and poured it in the forms and was astounded at the result. It made a foam that looked just like Last-a-foam, just a little more rubbery in texture. Absolutely almost invisible cell size. Thanks mate!
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Formwork in, but the pour foam is toast...
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Crivens! That looks lovely!
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It's pour foam Jim, but not as we know it...
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