HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Feb 01, 2013, 11:42 PM
Registered User
Joined Feb 2013
4 Posts
Mini-HowTo
How to determine the coefficient of drag/lift?

Hey guys im new to the forum, however i have been studying rc jets and they operate for the last 2 years. My question is How is the coefficient of drag/lift found without practical assessment, I.e. wind tunnel experiments etc.
SaundazDiGovt is offline Find More Posts by SaundazDiGovt
Reply With Quote
Sign up now
to remove ads between posts
Old Feb 02, 2013, 02:05 PM
Registered User
Denver, CO
Joined Dec 2005
6,380 Posts
Lots of math, or a few estimations based on previous experience. Hard to get it exact without actual in flight measurements, or computer simulation.

students.sae.org/competitions/aerodesign/rules/aero_nicolai.doc
Roto Rob is offline Find More Posts by Roto Rob
Reply With Quote
Old Feb 07, 2013, 10:38 PM
Registered User
LuvEvolution7's Avatar
St.Catharines, Ontario
Joined Jan 2009
10,377 Posts
there are programs that will do it for you, if you know some of the parameters. there's a new one on the EDF forum by a member that seems to be very good. I haven't spent much time figuring it out, but it looks easy to use.
LuvEvolution7 is offline Find More Posts by LuvEvolution7
Reply With Quote
Old Feb 14, 2013, 11:56 AM
Registered User
Joined Feb 2013
4 Posts
Alright thanks guys.
SaundazDiGovt is offline Find More Posts by SaundazDiGovt
Reply With Quote
Old Feb 16, 2013, 10:42 PM
Too many numbers
United States, IL, Lake in the Hills
Joined Oct 2010
1,830 Posts
I use Solidworks. It does a great job IF you remember to use the correct Reynold's number.
c131frdave is offline Find More Posts by c131frdave
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Lift and Drag Coefficients noodle Modeling Science 23 Oct 04, 2014 04:12 AM
Discussion Figuring out L/D ratio and drag coefficients derp express Modeling Science 10 Jan 28, 2013 04:06 PM
Question Lift & Drag Coefficients for Slow Stick FoamCrusher Power Systems 2 Oct 27, 2003 10:17 AM
How to Calculate AIRCRAFT Lift & Drag Coefficients? green66 Modeling Science 2 Oct 26, 2003 12:37 PM
Maximum lift coefficient from Polar chart.. how ? Pook Modeling Science 6 Sep 20, 2003 08:08 PM