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I'm looking for the properties of flame, burning and smoke of asphalt cement which is popularly used in pavement. Please advise if you know. Thank you in advance.

Ferdo, You might misunderstand my question. My questions were about landing gear structure strength to ground loads (drag/friction, normal/vertical). When we design landing gears, what are structure strength (design and ultimate loads) standards/limits?

mogorzalek, I don't think your question is properly defined. L/D is associated with angle of attack. Generally speaking, L/D increases with angle of attack up to stalling angle of attack. The maximum L/D will be reached around of the beginning of stall. However, the conclusion is based on the...

To prevent underground moisture penetrating into top pavement, I heared that a layer of a moisture barrier can be applied just beneath the pavement. This technique might have been used at Tennis Courts. Do you know where I can find the technical information about the moisture barrier and the...

If there are drag and vertical loads acting on aircraft wheels, what is the design and ultimate standards/limits for civil aircraft? Are they usually 0.8g in drag and 1.5g in normal?

To test our product, we are considering to conduct small aircraft wheel test. First, we need find the wheel rims for Beech 1900, Learjet 35 and Saab 340. Because of budget limitation, used one will be prefered. Do you know where I can find them? Thank you very much in advance.

styrofst, Your question is too broad. You are asking an engineering major. Any way, you might want to visit the web site www.deskeng.com to get some senses. Best Regard, Jack

cuky2000, Thanks for your answer. According to the info you gave, the concrete is electrically conductive - with the range 0 - 10^5 Ohm-cm. Is it right? Thanks Jack

Does any one know what's the surface resistivity (electrical property) of cement or concrete? Could it be 10^15 ohm? Thanks

I'm confused by the definition of Pneumatic Area inside a landing gear (LG) strut/shock absorber. One article said it's the section area of OD of an inner cylinder. However, I thought it's the section area of ID of an outer cylinder. If the OD of the inner cylinder and the ID of the outer...

To detect if there is any water within 2 to 3 feet under dry surface, what portable devices you suggest me to buy? And where I can buy? Thanks

Does any one over there know how can I convert a 3D wireframe file created by AutoCAD LT to a (*.stl) file format? Can any 3D modelers such as SolidWork, Solid Edge, etc. do this work? Thanks Jack

Does any one over there know how can I convert a 3D wireframe file created by AutoCAD LT to a (*.stl) file format? Can any 3D modelers such as SolidWork, Solid Edge, etc. do this work? Thanks Jack

Is anyone over there who knows how aircraft discharges itself before touching down on the runway? I think when aircraft flies in sky or pass through a static charged cloud, the aircraft could be fully charged because of friction or through direct transfer. The fully static charged aircraft could...

Thank you very much, Ron and Ginger. If there is no cement left for continuous reaction with water, will the concrete have a constant strength? I thought that if the concrete constantly contacts with water such as bridge fundation, the strength would eventually decay over long period of time...

Thank you very much for your answer. However, after the concrete is fully cured, the strength of the concret under wet and dry conditions should not be the same? You cannot imagine that a concrete building in raining day is stronger (may be weaker) than sunshine dray day's.

I alway think that fully cured concrete has different strength under different wet conditions. Is it true or not?

With the keyword "Aeroacoustics", you can find lots of books in these web sites: www.amazon.com, www.booksamillion.com. Or you can use a search engine to find more.

I do'nt think water has natural frequency, because water is not a elastic material. You may talk about the thing in molecular level?

I added black pigment powder into polyurethane fluid and painted on a epoxy treated surface. After the paint dryed up, there were a lot of cracks on the paint, which obviously is not good. I want no crack on the paint. What I should do? Thanks