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Model Forum / Radio Controlled / Air Models / June 2004Here we go again: Fuel foaming in tanks due to vibration
I screwed up and followed the instructions mounting the tank in my new bird without wrapping in foam, and now the vibration is causing air bubbles to enter the carb. I have heard that dishwashing soap and Armor All can help. What really works and how much is needed? > I screwed up and followed the instructions mounting the tank in my new > bird without wrapping in foam, and now the vibration is causing air > bubbles to enter the carb. > > I have heard that dishwashing soap and Armor All can help. What > really works and how much is needed? Forget the additives and install the foam wrap. It really works ;-) Dave I agree. Why have to add something that doesn't need to be in the fuel to make up for bad design? -- Paul McIntosh http://www.rc-bearings.com > > I screwed up and followed the instructions mounting the tank in my new > > bird without wrapping in foam, and now the vibration is causing air [quoted text clipped - 7 lines] > > Dave If you can't correct the lack of foam padding, you might try a DuBro sintered bronze "Filter Klunk" in your tank -- the sintered bronze tends to break up the bubbles in the fuel. DO NOT ADD ARMOR ALL! Cheers -- \__________Lyman Slack_________/ \______AMA6430 IMAA1564___/ \____Flying Gators R/C______/ \__Gainesville FL _________/ Visit my Web Site at: http://www.LymanSlack.com > > I screwed up and followed the instructions mounting the tank in my new > > bird without wrapping in foam, and now the vibration is causing air [quoted text clipped - 7 lines] > > Dave I wish that I could. The tank is in a tight compartment that is sealed. > > I screwed up and followed the instructions mounting the tank in my new > > bird without wrapping in foam, and now the vibration is causing air [quoted text clipped - 7 lines] > > Dave What will you do if it starts leaking? -- Paul McIntosh http://www.rc-bearings.com > I wish that I could. The tank is in a tight compartment that is sealed. > [quoted text clipped - 9 lines] > > > > Dave Rekit the engine pod and nacelle..... I REALLY hope it doesn't leak. > What will you do if it starts leaking? > [quoted text clipped - 16 lines] > > > > > > Dave I don't know why, but I have never had problems with bubbles. I have mounted tanks wrapped on occasion, but usually not wrapped. I have one plane that I have the tank wrapped in foam and it produces the same amount of foaming in the tank as it doesn when it isn't wrapped. No bubbles come down the line though. Are you sure the bubbles are coming from the tank? I have used the sintered clunks occasionally, but I prefer Hayes tanks and they don't fit in their small holes. John VB > I screwed up and followed the instructions mounting the tank in my new > bird without wrapping in foam, and now the vibration is causing air > bubbles to enter the carb. > > I have heard that dishwashing soap and Armor All can help. What > really works and how much is needed? Sometimes you can attack the cause...vibration. Make sure your prop and spinner are really on balance, try a three blade prop, soft mount the engine, try a different engine, doubling the firewall occasionally works, and also one of thoes Harry Higgly crankshaft weights. Phil AMA609 > I screwed up and followed the instructions mounting the tank in my new > bird without wrapping in foam, and now the vibration is causing air > bubbles to enter the carb. > > I have heard that dishwashing soap and Armor All can help. What > really works and how much is needed? I have seen some pack the tank in too much foan, and having trouble wit foam...my best installs involve a foam base to set the tank on, then velcro wrap. Very minimal contact with plane then, and no foaming Sometimes more is not always best. Mar +------------------------------------------------------------------- |Filename: tank 2.JPG |Download: http://www.rcgroups.com/forums/attachment.php?attachmentid=238804 +------------------------------------------------------------------- -- mcrabby31 If all attmempts at mechanical cures fail, ArmorAll works great. I have an ARF with a no-foam tank installation and a vibrating engine (STG51) and use ArmourAll as an easy way to stop foaming. I've used it a LOT with no problems with glow plug life, engine problems etc.. At one time, I routinely added it to my gallons of fuel when I was adding extra castor. I've burned at least a couple of cases that way with no problems. Now, I'm more cautious about fuel tank mounting and don't really need it. Add one drop at a time to your fuel jug, shaking vigorously each time. In a gallon jug, after somewhere around four drops the foaming after you shake the jug will suddenly and completely stop. Good flying, Bob Scott |
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