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Shane Crawford

Foam

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Would be nice if Wicks and Spruce provided the manufacturer's part number for the foam! That way people in other countries would be able source the products from their local distributors... Also, without this information how do people in the States know exactly what they are getting?!

Edited by Shane Crawford

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The foam specifics (H45 PVC, Urethane, Last-a-foam) are in the plans of the aircraft you are building so that you can get the foam from any source and not be tied to any specific vendor.  Which foam product are you having trouble finding? I don't know for certain that the foam Spruce or Wicks ships to me is correct, but I trust them.  I then verify that the foam they ship matches the description of that foam in the plans.

It would be "nice" if they shared their sources, but a company makes money by finding a source for a product and then reselling that product in small quantities for a higher price.  For example, Garmin charges $400 for their GTP 59 OAT probe (needed for the G3X), but if we had Garmin's source we could buy the probe for less than $50.

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Thanks for your reply. Was looking specifically at the Styrofoam / polystyrene foam for the wings. Trying to find out if I can source most of the materials locally before starting - Australia is a long way from most places, so it would be un-economical to freight large objects regardless of weight $$$.

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I expect you can find this foam in Oz from an insulation company.

https://dctech.com.au/wp-content/uploads/2018/12/Styrofoam-LB.pdf

Dow blows various weights, densities and types of Styrofoam.  The stuff we want is 2 lb/ft3 extruded large cell, closed cell (rigid) Styrofoam (polystyrene) but I don't know the compressive spec.  A recent cozybuilder's post, mentioned "Styrofoam LB-H-XP", which weighs 20-70kg/m3 (1.2-4.39 lb/ft3).  Here are the specs   http://msdssearch.dow.com/PublishedLiteratureDOWCOM/dh_0944/0901b80380944976.pdf?filepath=xenergy/pdfs/noreg/291-71625.pdf&fromPage=GetDoc   and another reference for high compressive-strength foam

https://stars.berkeley.edu/assets/files/styrofoam_MSDS.pdf

I don't know a reference that shows both weight and compressive strength but I suspect that if the foam is about 2 lb/ft3, it's compressive strength will be OK.  Can't swear to that.  The first URL above says their foam has a minimum compressive strength of 300 kPa (43 psi).  The Cozy plans don't specify a compressive strength.

This boat dock billet is very close to 2 lb/ft3   https://store.eastcoastlumber.net/products/dow-dock-float-billet-10x20x96|102096B.html

In the early days, builders used boat dock billets but I believe there was a caution about buying foam with voids.  Personally, I think it all comes from the same Dow process so if the foam-type and weight are satisfied, it will be usable.  If you find some foam in Oz, post it because this question comes up from time-to-time.

Oh, yeah, when you talk to the dealer, you want to "build some surfboards".  🙂

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