Simple Aerodynamic Formulas: mass/thrust/aoa/speed

[othmanskn]

http://www.rcgroups.com/forums/showthread.php?t=458466&page=2#post5342672

Post 24 is a sample of YASIM FDM (Flight dynamics modelling),

which requires a more realistic relationship between
mass, thrust, angle of attack and speed, in order to converge.

Since I don't have these data conveniently for a particular model, I'd like to see their relationships in the form of graphs so that I can input various combinations into YASIM in order to see their flight behaviour in the Flightgear enviromentment.

If someone can point me to good resources, it should be faster for me. I used to calculate these relationships using kinetic theory but I found the errors compared to xfoil to be so much, more than 300%, that I'm pretty sure will not make YASIM converge.

[Ollie]

Getting airfoils polar data below reynolds number of 100k to 60k is not easy nor accurate.

Read the article "Theory, Testing, & In-Flight" by Camille Golidesaline published in Quite Flyer, April 2006.

About simple (?) aerodynamic theories for reynolds numbers below 10k, read:
http://links.jstor.org/sici?sici=0080-4622(19840224)305%3A1122%3C1%3ATAOHIF%3E2.0.CO%3B2-O

How are low and speed and size small model limits applied to your progam?

[othmanskn]

Getting airfoils polar data below reynolds number of 100k to 60k is not easy nor accurate.

Read the article "Theory, Testing, & In-Flight" by Camille Golidesaline published in Quite Flyer, April 2006.

About simple (?) aerodynamic theories for reynolds numbers below 10k, read:
http://links.jstor.org/sici?sici=0080-4622(19840224)305%3A1122%3C1%3ATAOHIF%3E2.0.CO%3B2-O

How are low and speed and size small model limits applied to your progam?

I'm not sure if I understand your question but my program, YASIM is not well documented and there is no mention of limits on the available documentation but its source code should be available.

I believe I find some info from the nasa site which provides foilsim, which is better than xfoil because it can model many shapes and densities, even gave examples of conditions at MARS but that is low pressure areas but higher reynold numbers.

But then we have lots of data from RC hobbyists who can estimate its flight behaviours for us.

[Ollie]

Do you want to only use "simply" aerodynamic theories and limit to some RC sizes, speeds and configuritions?

How do you define aerodynamic theories?

Why do you find the limits? Ask NASA about foilsim's limits! Ask Dr. Drela about xfoil. Go to the source!

See:
Simple ( one taper and no control areas and any airfoil)
http://aero.stanford.edu/WingCalc.html
Or complex
http://www.amadistrictii.org/cjrcc/wing2/wing.html
Just soaring
http://rc-soar.com/tech/perfanal.htm
http://my.athenet.net/~atkron95/pcsoar.htm
http://www.charlesriverrc.org/articles/flying/markdrela_ds.htm
http://www.wfu.edu/biology/albatross/atwork/dynamic_soaring.htm
http://www.sloperacing.com/results/ds-speeds.htm
Or
http://www.liftworx.com/pages/redherring.html
Vs
http://www.gws.com.tw/english/product/airfly/magician.htm
http://www.globalhobby.com/public/gallery/157100.asp

You want to all to roll up the whole aerodynamic enigeering subject in your program?

[Ollie]

There's more.

The "smallest" R/C aircraft (so far)?
http://www.plantraco.com/hobbies/product_butterfly.html

Do you want to cover this R/C model for your program?