"Lipoly.de does stock APM and all sorts of bits and pieces for Arducopters etc. Try a search on Arducopter or Ardupilot. Also try http://www.unmannedtechshop.co.uk/ or http://www.buildyourowndrone.co.uk/
Peter"
Tom's Discussions
jDrones AC2830-358 Dynamic Characteristics (replaced by EMP2836/09, 880KV)
Started this discussion. Last reply by Tom Jun 22, 2012. 2 Replies 0 Likes
I'd like to simulate a jDrones AC2830-358 motor using Simulink. I'm guessing, it's characteristics wouldn't be too different of many other engines with similar KV ratio, power and size. In…Continue
Tags: simulation, engine
Propeller drag coefficient from thrust coefficient? (EPP1045)
Started this discussion. Last reply by Tom Jul 14, 2012. 10 Replies 0 Likes
Is it possible to calculate propeller drag coefficient from thrust coefficient? Are they related in any way?I have calculated propeller thrust coefficient by simple approximation using…Continue
Tags: drag, propeller, aerodnamics
A complete list of quadrotor electronic platforms
Started Jan 9, 2012 0 Replies 0 Likes
I've been searching for a list of available hardware I could choose from when building a quadrotor (or hexa / octo / ...). Has anyone passed around a list like that? I'm interested in complete…Continue
Tags: electronics, hardware, quadrotor
Where to buy aluminium profiles like the ones for ArduCopter frame
Started this discussion. Last reply by DaveyWaveyBunsenBurner Jun 28, 2011. 6 Replies 0 Likes
Hi,I already spent many hours searching through the web, so I decided to ask. Does anyone know where (apart from jDrones shop) can I buy 12x12mm 0,5mm thick alu profiles?Regards,TomContinue
Tags: frame
Tom's Page
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Christian replied to Tom's discussion ArduCopter KIT ordering (from EU)"Good morning,
Old Post but maybe someone has information about this: I want to order the Hexa-C Copter from the US to Germany. Is there anyone that ordered a copter (Price $605), I'm just unsure how much the german customs are on this…"
Tom replied to Tom's discussion Propeller drag coefficient from thrust coefficient? (EPP1045)"Drive Calculator data for comparison below.
"
Tom replied to Tom's discussion Propeller drag coefficient from thrust coefficient? (EPP1045)"Thanks, you just made my day. I made two mistakes: was not using slugs/ft3 for air density - but had tried this alone, and was using rad/s instead of RPS - and this was the main problem.
Attached the Excel file I did the calculations in and some…"
Brad Hughey replied to Tom's discussion Propeller drag coefficient from thrust coefficient? (EPP1045)"Just to keep the units consistent, I'm using feet, pounds, and slugs (standard density :: 0.00238). You have the formula correct.
n = rotations per second (RPM/60). So, for the APC 10 X 4.7 @ 6528 RPM:
T = (0.1274) * (0.00238) *…"
Tom replied to Tom's discussion Propeller drag coefficient from thrust coefficient? (EPP1045)"OK. I've done some more calculations and assumed Mr Brandt and Selig were using Imperial units and as C_T is dimensionless, hence:
T [lbf], 1lbf = 4,48222N = 0,4535923kg
rho = 0,074887[lbm/ft^3]
n[rad/s]
D = 10inch = 10/12ft
Also noting that…"
Tom replied to Tom's discussion Propeller drag coefficient from thrust coefficient? (EPP1045)"I just read the UIUC paper (I'm unfortunately very busy these days) and was trying to use the data available in their database. But there is some ambiguity regarding part of the variables and units used. They say to have calculated the thrust…"
Tom replied to Tom's discussion jDrones AC2830-358 Dynamic Characteristics (replaced by EMP2836/09, 880KV)"I'm guessing it's mechanical - I'd like to draw step responses and generally control-theory related analysis and then incorporate it into a bigger quadrotor simulation I'm working on."
"Regarding the inductance, L : That could be determined with a L/C meter or a specification not normally published by the manufacturer (as in most RC folks don't care).
It will be necessary to determine the configuration of the windings of the…"
Tom posted a discussionjDrones AC2830-358 Dynamic Characteristics (replaced by EMP2836/09, 880KV)
I'd like to simulate a jDrones AC2830-358 motor using Simulink. I'm guessing, it's characteristics wouldn't be too different of many other engines with similar KV ratio, power and size. In DriveCalculator's database I found EMP2836/09 (880KV), which I suppose could be used for a decent simulation, or at least as a starting point.I'd like to use a simple mathematical model given in one of the great CTMS…See More
Brad Hughey replied to Tom's discussion Propeller drag coefficient from thrust coefficient? (EPP1045)"Maybe the king of England at the time had big feet and a missing finger? :-)
Anyhow, the best little conversion program I've ever found is free:
http://joshmadison.com/convert-for-windows/"
Tom replied to Tom's discussion Propeller drag coefficient from thrust coefficient? (EPP1045)"Thanks again Brad, I'll read it through. From what I've seen already, it's going to make me understand imperial units better. How could anyone using decimal notation have invented it? :)"
Brad Hughey replied to Tom's discussion Propeller drag coefficient from thrust coefficient? (EPP1045)"Angular velocity is not enough to calculate torque. Since you have power, just use that. From classical mechanics (in imperial units):
Torque (lb/ft) = ((Watts*7.04)/RPM)
Use actual power, not ideal power of course. Here's a…"
Tom replied to Tom's discussion Propeller drag coefficient from thrust coefficient? (EPP1045)"Thank you Brad. The Illinois Database is really great, and probably exactly what I was looking for.
Actually, what I'm trying to achieve is to calculate thrust and drag of a particular (jDrones AC2830-358 + GEMFAN 10x4,5) engine + propeller…"
Brad Hughey replied to Tom's discussion Propeller drag coefficient from thrust coefficient? (EPP1045)"Coefficient of drag (Cd) is an attribute of an airfoil section (or any particular shape) at a particular angle of attack (AoA) and Re. We can use calculus to integrate those values over the entire radius of the blade, but it appears to me your…"
Tom posted a discussionPropeller drag coefficient from thrust coefficient? (EPP1045)
Is it possible to calculate propeller drag coefficient from thrust coefficient? Are they related in any way?I have calculated propeller thrust coefficient by simple approximation using DriveCalculator. I then made some curves in Excel and would like to repeat the same for drag (prop: EPP1045, engine: EMP2836/09 880KV).See More
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- About Me:
- Beginning quadrotor enthusiast
- Tell us a bit about your UAV interest
- vision based indoor quadrotor attitude stabilisation
Comment Wall (2 comments)
- At 11:23am on November 30, 2010,
jaron said… - Tom, it'll be possible to simulate quadrotors with UAVsim (UAV Playground) but I haven't planned it. Nobody has done it so far and it'll need some effort to do so.
- At 11:09am on July 7, 2011,
Developerjasonshort said… You can PM chris to get added. Hopefully we'll find a solution soon to make the list public. It's mostly a technical one.
Jason
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