Paul et al,

The recent TTC engine run postings, turbo compound threads, and my own
efforts have started me thinking about an engine test stand and the
features/performance it should demonstrate.

Obviously a control/instrument panel would incorporate some of the basic parameters like...

oil pressure

oil temp

engine (coolant) temp

exhaust temp

manifold pressure

air/fuel ratio

rpm

throttle position

fuel flow/totalizer

time

hobbs

throttle

mixture

ignition

What other controls/measurements should be incorporated on a basic level?

What about on a more advanced, special situation level (e.g. waste gate position when testing turbos)?

Should it be easily transportable?

And what about safety features (fire extinguishers, kill switches, etc.)? What do you suggested?

Ideally a data acquisition and control system would collect, log, and display the data. I use National Instruments LabVIEW software and hardware (along with other manufacturers like Omega, Interface, Banner, etc.) for such at work. But it looks like other solutions are available through some of the systems discussed in postings here. Personally I'd prefer to use something available and proven in order to get to the engine testing instead of debugging I/O systems (even though I do that a lot with NI LabVIEW!!). What is available and what are your thoughts on that? 

There are many automotive type test stands out there for basic run in testing. But I would expect an aircraft test stand to measure torque and thrust for a prop generated load. Not too many (none???) out there that I saw, but please let me know about any that you know of.

Is there any sort of "standard" test prop that would be suited for initial or comparative testing?

A DIY stand seems more practical from a cost and achieving desired capability standpoint.

Therefore, what would be a good upper limit of each value to start sizing a stand?

Max engine torque = ?

Max engine thrust = ?

Obviously the answers to my questions are very subjective with many variables and personal preferences that could affect the answers. At this point I'm just looking for some rough initial numbers for the upper limits and capabilities that "amateur home builder" folks like us might like to see a stand incorporate.

I think the TTC engine might be representative of such performance limits? Yes? No?

And what are the thrust and torque goals for TTC?

Is anyone else interested in building such a stand?

So put on your thinking caps, let your imagination run wild, and let me now your thoughts on this matter.

Looking forward to your responses!

Warm Regards to All,

Brad Chubb