Recent content by reidh

Fans (or propellers) are constant volume devices. Given a few assumptions, a fan will move a given volume of air per revolution regardless of air density or temperature. To answer your original question, the volume flow rate for a fan should be independent of altitude. Fans are typically...

Depending on your location, it may be easier and cheaper to send your components to a test lab with an in-house anechoic chambers and staffed with engineers. I know that many of the test labs that formerly catered to the automotive industry are more than willing to branch out to other...

Gerrit, Although I don't think this is specifically what you are looking for, there was a NACA Report 117 from the 1920's that dealt with drag of the Zepplin airships. Regards reidh

SloFlo, SAE has an aerospace specification, AS 567, that covers safety wire. Regards reidh

Drivefast, You can absolutely do this, but like evelrod stated, servicing AN fittings may be easier for future maintenance. -Reidh

I believe that Haltermann products (a Dow Chemical company) makes a gasoline replacement test fluid. We have used Haltermann for reference fuels, its certainly worth giving them a call to see if they can help you. -Reidh

Sum of forces, sum of moments = 0, assuming everything is static.

I don't know where you are located, but Valerie Nelson and Jack Williams (they both used to work for Ford in the cooling system design dept.) teach an SAE course in the USA on cooling system design that may be of help. I can't vouch for their course, but having worked with both of them, they...

Usually a load cell is used, which has an analog output. A signal conditioner is sometimes needed. We have used Revere load cells with good luck, but there are many many brands out there that will work. -Reidh

A simple patent search of ringless piston engines on Google provides a good bit of material on the subject. -Reidh

You should check the ASTM specs for piping for your specific application: ASTM A-53B, A-52F, or A-106 specs could be applicable. Off the top of my head, A-106 is a seamless pipe which is used for high temperature high pressure applications, and may be overkill for you needs. -Reidh

Park Scientific Instruments used to deal with these, although I must admit we decided not to use them. We were tinkering with the idea a few years back, but the cost was prohibitive at the time. -Reidh

Two sensors with one trigger point would work quite well. -Reidh

dgallup is correct. The standard lapse rate is about 1 C for every 1000 ft of altitude change. A quick search of aviation fuel properties should give you a chart for density vs. temperature. -Reidh

I would collect a large series of data points for your inductive sensor, say 20 data points (every half volt if it is a 0-10V output). Perform this test twice, once when you are increasing in distance, once when you are decreasing in distance. Plot both of these and compare the trendlines...