tapkoote

John here is one article I subscribed to. http://www.rcgroups.com/forums/showthread.php?t=1321258 Since this just a one time use I want to keep cost down, I know of a guy bagging hulls for carbon fiber his vacuum system alone is over $1200 there are a few who get about the same gauge reading from these pumps I'm in the process of locating the material I need Thanks again Tap

thank you John I'm sure these guys use gauge pressure because they speak of holding 25 to 28 inches for 4 hours on model air plane wings and the pump I want to use isn't capable of more than 5 inches hg I'm sure if they used absolute pressure it would crush the styrofoam Thanks for the help Pat PS think I'll test it on a coffee can first

I'm a retired hobbyist, with a basic under standing of math, science, physics I want to glue a thin wood veneer on to deck of a radio controlled hydroplane. I want to clamp it with a clear plastic vacuum bag system. the hull is giber glass but basically hollow. The pump will produce 5 "hg, just under 2 1/2 pounds per square inch. this is the part I can't get my mind around. The hull is 50" X 24", lets say 1200 square inches. At a half pound per square inch, am I applying 600 pounds of force to all sides of the hull? Thats like having two great big guys stand on my little boat. I've tried other forums, hope you can help. Tap Otto von Guericke, (1602-1686), a German physicist, born in Magdeburg, performed a famous experiment: the "Magdeburg Hemispheres". These were two halves of a large, hollow metal ball. When all the air was sucked out of the ball, two teams of eight horses couldn't pull them apart, because the pressure of the Earth's atmosphere created a very large force on the ball. You may have seen a smaller version of this experiment in school.