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Discussion
Power Systems for Extreme Flight Fanatics!
This thread is designed to post data, observations, questions and any other banter that is related to power systems (Motor, ESC/ BEC, Lipo, Prop) for Extreme Flight and 3D aircraft.
I have found that every build thread for every different plane contain lots of questions, and information that is discussed and re-discussed over and over. This thread is designed to consolidate this valuable information as well as to stream line the many different build threads out there. HAVE FUN! Please visit here for all results: https://www.rcgroups.com/forums/show...&postcount=267 Also See Here: https://www.rcgroups.com/forums/show...&postcount=269 |
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Last edited by YellowJacketsRC; Sep 12, 2013 at 07:58 AM.
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I bought the Hyperian - Z4020-16 Motor and looks like the Torque and is a bit lighter...
Yeah, I bought it for the MXS 60 inch when it comes out! I'm getting ready! : ) https://www.rcgroups.com/forums/show....php?t=1529103 picture-Vienquach Vox Prop 15 x 6, 57 amps and watts about 1350.00 on Gens 2500mah 6 Cells good luck fred |
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Last edited by Flazo; Nov 04, 2011 at 03:32 PM.
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It's like the amazon of extreme flight power system info.
Way to go Dead. Bravo nicely done!
It would be super hip and cool if the extreme flight build thread owners of the world i.e. the Chris's, Tim's and Flops would point readers to this new extreme flight exclusive power system thread. This would satisfy the curious and avoid the ever present re-discussing of differing opinions, re-sharing data and re-dragging everyone through the same old matches. Then the build threads could focus on the plane. You have created one stop power system info shoppin! It's like the amazon of extreme flight power system info. |
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Last edited by leespaddock; Aug 29, 2012 at 11:40 PM.
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Xoar 15x6 PJN series
Lee,
Thank you for your research and results with the propeller testing. http://www3.towerhobbies.com/cgi-bin...&I=LXAPTU&P=SM is one place to get the Xoar 15x6 PJN series prop. Per the Xoar website, the PJN series is listed for electric and the PJA series is listed for gas. The only difference between the PJN series prop and the PJA series prop that I could see from the Xoar website is that the PJA series prop weighs 41 grams and the PJN series prop weighs 30 grams. See http://www.xoarintl.com/props/model-airplane/PJN.html. If you need a Xoar 15x7, the PJA series prop in a 15x7 is also available at the Tower website. Hope this helps and happy landings! Quote: Originally Posted by leespaddock Great information. Now can you tell me which vendor has a 15X7 and a 15X6 PJN Prop? I have scoured the web and came up dry. I guess as a last resort I could contact Xoar again and back track their wholesale history to their retail vendors, but since Tim just bought 3 of them I thought he could provide that info better than anyone. Lee |
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I was contacted about this thread and it makes a lot of sense! I'll just post some info up here so I can refer back to it the next time it comes up:
Okay, here's my speech on calculating flight times. It works for me and I hope it makes sense I have found that if you have a battery that is (let's pick a round number) 2000 mAh, when your battery is fully discharged, the volts per cell (vpc) is down around 3.2-3.5 (about where the average Low Voltage Cutoff is on most ESC's). I have devised a formula to help me calculate my flight times. Here's what I do: Let's use a round number for this example. The hypothetical battery in this equation will be a 2000mAh battery. I set my timer to count up (counts how long you've been flying) and then takeoff, trim the plane, and land, and right down the flight time. Then charge the battery and look at how many mAh's were put back in. What I do is subtract 25% of the full battery (500mAh is 25% of 2000mAh), and that gives me 1500 usable mAh's (that other 25% gives you a pass or so to go around if you have to, and the plane will still land at about 3.7-3.8vpc which is the ideal voltage to extend battery life). So say you were up for one minute trimming. Say when you charged it the charger put back 500mAh. So now divide 1500 by 500(usable mAh by mAh used) and you get 3. That means that you can multiply your trim flight time (1 minute) by 3 (giving you 3 minutes) and you most likely will have a flight time that won't damage your batteries or bring the volts per cell below 3.7. [Disclaimer: This is just my technique and is what I use to figure flight times.] --Tom K. |
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As far as the glow prop vs. electric prop debate:
Props that aren't made for electric motors are heavier. Heavier translates to more amps, more heat, and slower throttle response. The glow props are thicker at the hub and thicker all throughout so they can handle the power surges of a piston engine, and therefore, when modulating throttle, the electric motor has to overcome more inertial leading to more stress on equipment, i.e. possible magnet problems in the motor, overheating/overamping ESC is possible, and less overall cycles the battery will be able to live to see. --Tom K. |
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Quote:
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Wow! YOu guys sure have jumped on board. Thanks!
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Quote:
--Tom K. |
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the difference doesn't push things up to stress/damaging levels, it's like running an electric prop that's inch bigger without the reward of more thrust... there are things the prop will help and things it wont... throttle pulsing wouldn't be one of those things it helps, but for those who don't throttle pulse will find them pretty darn smooth. Either way electric props are generally very much the way to go, nobody wants to waste watts, but the story of damaging equipment by using gasser props isn't really the case. Lightweight gasser prop on an electric motor can have quite a sexy result.
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Quote:
--Tom K. |
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