

Feb 26, 2013, 01:43 PM  

Hi Joan,
You can find a lot of high quality wind tunnel performance tests of the sort of propellers you will be using at this website. http://www.ae.illinois.edu/mselig/props/propDB.html You could use a force sensor to measure thrust directly. You could do glide testing. This is much simpler and cleaner than measuring while under power. Plus  propeller slipstream flowing over model increases total drag. No wind glide ratio is equal to lift/drag. Lift ~weight for shallow glide angles. So if the advance is equal to ten units forward for each one unit of descent, then drag ~ weight/10 Speed and glide angle measurements can be easily documented and analyzed photographically. Of course once you have drag and flight speed measured, the coefficient is calculated as you indicated. 
Feb 26, 2013, 05:08 PM  
United Kingdom, Glos
Joined Feb 2009
523 Posts

Have a look at the sensors and data logger from SMModelbau for the Multiplex M Link, Graupner Hott and Jeti radio control systems http://www.smmodellbau.de/shop/ I've just bought one of the Unisens E multisensors to work with my Multiplex M Link telemetry set up, I haven't used it yet but it's a very neat package. The Unisens E and GPS logger may give all the information you are requiring, have a read up on it, it maybe that you can use it as standalone with your existing equipment and just read it out after you've landed.

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