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I have a system that I want to insulate. I have several types of insulation avaliable and thus want to eveluate them. I also have the time constant for the systems (which was determined from testing). How do I go about incorperating the insulation properties to reflect the change in time...

Thanks daveleo for the suggestion. I'm going to get started on that type of analysis imediately If anyone can suggest a good FREE fe 2d thermal programs it would be appreciated. Thanks people.

Thanks for the advise. I've got one more question. How would you deal with a multiple material layer where the conductivity was very different. For example Hot Air IIIIIIIIIIIIIIIIIIIIIIIIIIII CCCCCCCCCAAAAAAAACCCCCCCCCCC Cold Air Where I = Insulation...

Hey people, i need some assistance. I have a system that is exposed to a hot airflow. We have tested the system and know the thermal time constant. We now want to use a insulative paint to increase the time that the system can be exposed to the airflow. I tried to approach this problem using...

Hey People, I've been using that wonderful little program by Microsoft (don't we all love them!!) called excel and naturally am having a few problems. I have a data spreadsheet with several time related columns (ie hours, minutes, seconds). I would like to merge those 3 columns into one time...

Hey people. Does anyone have a good electronic reference for lift curves for various aerofoil sections? I normally use theory of wings but currently do not have access to it. Thanks for the help

Hey people, I think i'm driving myself mad here. I'm struggling with the following conversion: Original Units: BTU/[hr*ft^2*deg_F/ft] Desired Units: W/[in*deg_C] I've given it a go a couple of time and gotten very different results. So i figure i'm missing something. Now i know this is...

Hey people, Once again i'm after some assistance. I've got a rather simple system system of heated bodies. I want to figure out the heat transfer but have the problem of a faulty memory (probably caused by all the beer). Anyways, I currently don't have access to my texts or if anyone knows...

Hey people, I've got a thermal problem with some equipment on an aircraft. My boss has asked me to investigate the use of heat pipes as a solution. My memory of thermodynamics is rusty at best so if anyone can recommend any web sites for me to brush up on my theory (especially if they have any...

I've been using afgrow to do a fracture analysis. When it come to the material i prefer to use the nasgro equation model but i've come across the problem that the material i'm after is not in the material database. Anyone know a good reference (preferably a free web site- but beggers can't be...

Hey all, I'm looking for S-N curves for AL 7075-T6. I've looked at MIL-HDBK-5 and unfortunately the Kt value does not go high enough for me (the highest is 5.0 and i'm in the region of 8.0). Naturally i'd prefer any electronic resources but then again anything would be better than nothing at...

This is a general interest thing, so this question doesn't get anymore in depth than this: Does anyone know where i could find a good paper on the relationship between wing separation on a biplane and the wing performance?

astroclone, From my understanding the equation you have posted is correct. The difference is that yours allows for the radius between the center of gravity and the point of interest to change (thus the 2 * [w] X [rdot] term). This of course goes to zero if the distance is fixed, reducing it to...

Greg, That is the same conclusion I had come to. I just really wanted comfirmation before i moved on. Cheers.

Rigid Body Dynamics: The situation is an aircraft performs a manouver which involves rotation about all 3 axis. The result of this manouver is that any point offset from the center of gravity (CoG) experiences an acceleration that is the combination of the linear accelerations of the CoG and a...

Here is the situation. A helicopter was performance tested at full power. The maximum velocity was recorded (accounting for atmospheric conditions). The helicopter was then modified, adding a FLIR turrent to the nose. The post-mod helicopter was the performance tested. The result was that the...