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Model Forum / Radio Controlled / Air Models / February 2004lost fome process
ello everyone I am trying to fit a laser 160 v 4stroke engine into a flair giles it will go in but im having probs with the fuel tanks it looks like im goner have to build my own custom tank I think the expanded polysterine plug that is desolved out of the final product is the way to go but i would like mor info befor I atempt this new to me techique can you help? Before you go to that extreme, take a look at the polypropylene containers on the shelf at the local home stores. These are the storage and drink containers that are also available from Tesco and Asda. Many of them can be easily adapted for model fuel tanks. Look for the higher quality ones as the caps will fit better. They come in a vast array of sizes and shapes. Most can be sealed with silicone rubber or a great produce called PFM from Innovative Products in Florida. > ello everyone > I am trying to fit a laser 160 v 4stroke engine into a flair giles [quoted text clipped - 4 lines] > to me techique > can you help? Lost foam/wax tequneque as far as I know is for solid objects not tanks you make an object from foam or wax then cover the object in plastersine or plaster pour the hot liquid in using metal plastic or whatever and it dissolves the foam or wax plug and when cooled you have a solid object the same shape as the plug?? Kevin > Before you go to that extreme, take a look at the polypropylene containers > on the shelf at the local home stores. These are the storage and drink [quoted text clipped - 14 lines] > > to me techique > > can you help? There would be no reason you couldn't wrap it in fiberglas and epoxy. Then use gasoline to dissolve the foam. Personally, I wouldn't want a fiberglas fuel tank in a model! Hmmm. How about vacuum molding some HDPE around it? > Lost foam/wax tequneque as far as I know is for solid objects not tanks you > make an object from foam or wax then cover the object in plastersine or [quoted text clipped - 21 lines] > > > to me techique > > > can you help? RCMW have run a number of articles recently about making CF/Kevlar tanks for turbine models using the lost foam process. Jets often require awkward shaped tanks and this method is reputed to be very successful. Regards Peter > Lost foam/wax tequneque as far as I know is for solid objects not tanks you > make an object from foam or wax then cover the object in plastersine or [quoted text clipped - 21 lines] > > > to me techique > > > can you help? > (everything snipped) > Lost foam/wax tequneque as far as I know is for solid objects not tanks > thanks for the replys The proces I am thinking of involves making a plug from expanded polysterine covering it with epoxy/glass then desolving out the polysterine Leaving a shell of epoxy glass that will fit into the space I have avalable and give me at least 4oo ml The tank also has to go around the wing mounting lug and be shaped at the front to clear the carbs so a square contaner just isnt gonner fit > The proces I am thinking of involves making a plug from expanded polysterine > covering it with epoxy/glass then desolving out the polysterine Leaving a > shell of epoxy glass that will fit into the space I have avalable and give > me at least 4oo ml I read once a long time ago that nitromethane will slowly rot the epoxy so you will be restricted to straight fuel in an epoxy tank. This may be bollocks though - has anyone here actually tried this ? The method suggested does sound like an easy way of getting a specially shaped tank provided the fuel doesn't damage it.  SignatureBoo > I read once a long time ago that nitromethane will slowly rot the epoxy > so you will be restricted to straight fuel in an epoxy tank. This may > be bollocks though - has anyone here actually tried this ? Something in the fuel sure as heck eats away Araldite !!! I made up a refueling bottle for taking small amounts of fuel with me. Used Araldite to secure and seal two pieces of brass tube into the bottle lid. Damned stuff was eaten away within about 3 weeks. That was fuel with 5% nitro and 20% castor. If I remember correctly... I think the Araldite turned black before slowly, but surely, vanishing. Reg For a comprehensive tutorial on the lost foam method of building go to http://www.pjmodelclassics.be/ and click on building methods DB > ello everyone > I am trying to fit a laser 160 v 4stroke engine into a flair giles [quoted text clipped - 4 lines] > to me techique > can you help? I always use 2 X 20oz tanks from Richard Rawle @ Practical models. They include a nice felt filter. On the Swordfish they would not go in side by side unless softened by a heat gun, a dodgy process if overdone that could result in leaks. Next I invented the wine bag tank. take a 1.5 lt. box of wine, drink the contents. 3 lt. is better, Sleep. Next put in a rubber stopper from home wine making kit. Insert two feed tubs and one fill. No need for clunk or a vent tube, worked perfectly in a Cub test model with a 300V, The bag tank was a little two big for the Swordfish space causing creases as it emptied so, I went back to the 2 x 20 oz putting one on top of the other. Once the needles are adjusted it doze not make a scrap of difference to running. But this is a non aerobatics model. Lasers have a strong suck and are not critical on level. one of the reasons they are so popular in scale. You must be able to get two smaller square tanks in the with of a Laser's V? Balsa tanks lined with resin work ok as do lost foam resin tanks but get the correct resin and beware of bits. SignatureRichard Crapp |
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