$32 here in Missouri
> On Aug 26, 2015, at 10:11 PM, Bill Masquelier via KRnet <krnet at > list.krnet.org> wrote: > > I just checked on the price of extruded polystyrene at Whitecap- it is $76 > per sheet (2" x 4' x 8'). Does that sound anything near appropriate? It > sounds about 4 times as expensive as I would have thought! > Bill Masquelier > >> To: krnet at list.krnet.org >> Date: Sat, 22 Aug 2015 20:29:04 -0700 >> Subject: Re: KR> Foam, peel ply and tank vents... >> From: krnet at list.krnet.org >> CC: billmasq at hotmail.com >> >> Colin >> I was avoiding extruded polystyrene since I couldn't find it here in >> Southern California but since you brought it up again I have found that it >> is available near here (near French Valley) in Temecula at Whitecaps: >> http://www.whitecap.com/shop/wc/building-materials/insulation-materials/extruded-polystyrene-insulation >> >> so if anyone else here in SoCal needs it it does exist!! >> Thanks Colin and best on your trip over the Bearing Straits and beyond :) >> BillM >> >>> To: krnet at list.krnet.org >>> Date: Sat, 22 Aug 2015 23:23:19 +0100 >>> Subject: KR> Foam, peel ply and tank vents... >>> From: krnet at list.krnet.org >>> CC: colinhales at hotmail.com >>> >>> Several thoughts gents, >>> Bill, high there, I'll write soon, but continuing, unless you want to use >>> wing tanks, remember that Styrofoam is a much better product than Urethane >>> foam which I would NEVER ever use. >>> It crushes and has no rebound unlike polystyrene foams, so if you drop >>> something on your wing skin or someone kneels on it, the Urethane foam >>> crushes and a void is left behind the glass as it pulls away from the glass >>> skin. Styrofoam has a bit of bounce and give and this doesn't happen. Also >>> Urethane is open cell and you have to add the heavy layer of Micro balloon >>> slurry to seal it before adding the glass cloth and trying to wet it out. >>> If you want to still use Urethane foam, you can now get a closed cell type. >>> Any open cell foam can and will absorb water over time and you never know >>> about it. Even white polystyrene foam is not water tight enough and water >>> gets between the molecules over time, unless it is well sealed. >>> So personally open cell Urethane foam is just a bad idea all round. >>> I've squeezed water out of Urethane foam on a hovercraft, if you get water >>> on your plane with open Urethane foam, it goes in and you will never get it >>> back out. >>> If you want to use stub wing tanks, and have the outer panels dry, then by >>> all means use Urethane foam for the stub wings but use Styrofoam for the >>> outer wing panels. >>> Here is an article of other types of Styrofoam. The don't like the standard >>> blue foam much but they are hot wiring it. We are not. >>> https://www.flyingfoam.com/content/why-we-hate-blue-foam >>> >>> A typical good supplier of blue foam I would say is, >>> http://building.dow.com/en-us/products/styrofoam-brand-residing-board-us-only/?sc_itemid=320ebb4f-f0ab-47e7-a5b6-334429f8dec8 >>> Next, peel ply. >>> A good cheap source of peel ply is called 'Ceconite', you know the stuff >>> they stick on fabric aircraft? Go grab a load of off cuts from a fabric >>> shop or buy some, its as good as the peel ply you can buy, no silicones >>> obviously, and it comes in 6 foot wide strips in case you want to cover >>> large areas. It comes in different grades of light or heavy that will give >>> you different surface textures depending if you want to add on to the glass >>> or simply have a smooth surface ready for applying fillers and top coat >>> paints. >>> Fuel, >>> As for fuel sitting in vent pipes. If you can see the fuel sits in the pipe >>> or presume it would do in the dip, that is fine . The air will bypass the >>> fuel so don't worry about that, there is 'little' to 'no' head of pressure >>> in the pipe, any slight difference in pressure will move the fuel along. My >>> only comment on this is that you better make sure the vent pipe you are >>> using or going to use is happy to have avgas or mogas or regular gasoline, >>> whatever you intend to use sitting in it for long periods of time. Some >>> nylon pipes go brittle when immersed in fuel for long periods. Just food >>> for thought. >>> Sorry I'm going to miss the Kr gathering, I went through Mc.Minnville a >>> week or two ago on my way up to Alaska. It is a brill place to visit, town >>> is lovely, the puce Goose and the rest of the Museum is top rate and >>> Graham, Northwest Air Repair is a great host, so please pass on my regards. >>> I'm now in Anchorage, eyeing up the Russians and seeing what can be done to >>> continue. >>> Cheers Colin. >>> _______________________________________________ >>> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. >>> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org >>> please see other KRnet info at http://www.krnet.org/info.html >>> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change >>> options >> >> _______________________________________________ >> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. >> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org >> please see other KRnet info at http://www.krnet.org/info.html >> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change >> options > > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options
