Quadrocopter/tricopter NAV Lighting Ideas
Lets start a Quadrocopter/Tricopter Lighting Concept thread ...
Here's mine ...
I wanted to come up with a removable concept for Quadrocopter NAV lights for night flying only. Something that can be removed when flying during the day. The universal problem flying quadrocopters is orientation ... and it is even harder to track in the dark. I customized this solution for the X-3D Brushless Quadrocopter ... but, this can easily be adapted for other X and Y configurations as well. This is what I came up with.
Epilespy Warning: contains fast blinking lights
Raining outside so test was done in tight quarters inside the garage.
The first part shows the different manually selectable sequencing light patterns.
The CF Ring El/Glow Wire is switchable ON/OFF via the Transmitter.
The light booms also highlight the florescent tape on the props.
Front orientation is easily visible via el/glow wire along the top front boom and all LEDs ON underneath. Rear pattern = all LEDs blinking, Left/Right pattern = LEDs strobing outward.
Happy with the results ... Gives it a nice Close Encounters look.
More info here ... http://forum.xufo.net/bb/viewtopic.php?t=8065
Lets see what others come up with ...
Last edited by tend2it; Dec 30, 2007 at 04:51 AM. Reason: added warning
@joeling - looks cool and really BRIGHT!
Finally got around to weighing my removable NAV Lighting Boom ... it came out to 55grams ... not too bad at all.
For any platform of any size and weight, the flight time is the result of:
time = whkg / (1000*R / eff_gw) * 60, where
whkg = battery energy density, in Watt hour / kg, ranging from about 150 for the high C packs to 270 for LiIons. 10C Multistars are 185.
R = ratio between AUW and battery weight
eff_gw = motor/prop efficiency, grams per Watt, taken from mfr data.
Be aware to get from table the efficiency for the intended thrust, and for 50% throttle !
Efficiency greatly depends on load, so don't use efficiency stated for 1kg, to compute flight time of 2-3 lg platform !
Also, don't use values for more than 60% throttle, the platform will be unstable, no more room for motors to do their control job....
As I wrote, this formula works for ANY size platform and energy source, lets do the math for some particular cases:
Case I Ph2
battery wh/kg = 5.2(Ah)*11.1V/0.37(kg) = 156wh/kg
R ratio between AUW and battery = 1250/370 = 3.4
propulsion efficiency = 11g/W
time = 156 / (1000*3.4 / 11) * 60 = 30 min
Case 2 the 129 min record
battery wh/kg = 266Wh/kg - typical LiIon energy density
R ratio between AUW and battery = 3.4/2 = 1.7
propulsion efficiency = 14.1g/W
time = 266 / (1000*1.7 / 14.1) * 60 = 132 min
And finally, my 30 min case
battery wh/kg = 165, I use a Zippy Compact, having a bit more energy than the average LiPo
R ratio between AUW and battery = 0.75/0.195 = 3.8
propulsion efficiency = 11g/W - using Phantom 2 clone
time = 165 / (1000*3.8 / 11) * 60 = 28 min
As you can see from the above, reasonable precision of all estimations, proving this formula is valid for any configuration, so now you have a tool that should tell you what is wrong in your setup, and where to work to improve flight time.
The biggest unknown for most users is the propulsion efficiency, for this reason I think is mandatory to not buy stuff without manufacturer precise specification of this parameter.
renatoa is offline Send a private message to renatoa Find More Posts by renatoa
The motors and ESCs you have will determine how many cells (3S, 4S, etc.) you can use. With that being the case, a 4S LiPo will give you a longer flight time than an equivalent capacity 3S LiPo.
|Category||Thread||Thread Starter||Forum||Replies||Last Post|
|Mini-HowTo||LED Lighting Ideas....including Gemini||questtek||Foamies (Kits)||3||Dec 04, 2006 12:09 PM|
|Discussion||Scale nav lighting for helis?||Mark Wood||Electric Heli Talk||4||Apr 28, 2006 09:52 AM|
|Nav lighting system||jswayze||Micro Helis||0||Sep 29, 2005 03:38 PM|