convore.json/groups/nyc-robotics/lico-nanotech-6-amp-hour-battery-could-it-be/messages.json

[{"user_id": 4330, "stars": [], "topic_id": 41110, "date_created": 1309786118.4310651, "message": "This is 7.2", "group_id": 9523, "id": 1559635}, {"user_id": 4330, "stars": [], "topic_id": 41110, "date_created": 1309786141.2225161, "message": "Volts. What motors are we using? http://www.hobbyking.com/hobbyking/store/__17265__Turnigy_nano-tech_6000mah_2S2P_65~130C_Hardcase_Lipo_Pack.html", "group_id": 9523, "id": 1559636}, {"user_id": 31902, "stars": [], "topic_id": 41110, "date_created": 1309794173.4834211, "message": "@jasonaloy Did you order the motors?", "group_id": 9523, "id": 1560466}, {"user_id": 31506, "stars": [], "topic_id": 41110, "date_created": 1309897862.3202801, "message": "I've already ordered the motors, which should be arriving in a week or so. They're rated for 2-3s cell (7-11V). Each motor should draw around 10A full load. http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=6457, http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=5428", "group_id": 9523, "id": 1570201}, {"user_id": 4330, "stars": [], "topic_id": 41110, "date_created": 1309898010.6866519, "message": "We need a xenon difluoride battery! Who's rich?", "group_id": 9523, "id": 1570253}, {"user_id": 31506, "stars": [], "topic_id": 41110, "date_created": 1309898556.458426, "message": "DARPA!", "group_id": 9523, "id": 1570343}, {"user_id": 31902, "stars": [], "topic_id": 41110, "date_created": 1309901782.8764889, "message": "Also, at maximum current draw from the motors (40A) we're well within the capacity of the battery.  However, a good point is made in the comments about the impact of the packaging on the max discharge rate.", "group_id": 9523, "id": 1570742}, {"user_id": 4330, "stars": [], "topic_id": 41110, "date_created": 1309900786.7755389, "message": "ALL of their money!!! (rubs hands together & cackles).... Oh wait... That's tax money, so it's kinda ours...", "group_id": 9523, "id": 1570635}, {"user_id": 31902, "stars": [], "topic_id": 41110, "date_created": 1309900193.6548591, "message": "Excellent!  Now, let's work on a scheme by which we get them to give us some of their money.  Oh, wait.... ;)", "group_id": 9523, "id": 1570565}, {"user_id": 31902, "stars": [], "topic_id": 41110, "date_created": 1309900745.3844371, "message": "@jasonaloy Cool.  With 10A motors and that battery, my back of the envelope calculation says we should get between 9 and 18 minutes flight time depending what current the motors require to just maintain altitude.  Also, we'll stay well within the battery's discharge parameters.", "group_id": 9523, "id": 1570630}, {"user_id": 31902, "stars": [], "topic_id": 41110, "date_created": 1309900890.2658319, "message": "Haha.  @MickChagnet referring to the hobbyking link for the 6000mAh LiPo.  Am I horribly off in my estimate?", "group_id": 9523, "id": 1570644}, {"user_id": 4330, "stars": [], "topic_id": 41110, "date_created": 1309900816.7751939, "message": "\"THAT\" battery?", "group_id": 9523, "id": 1570638}, {"user_id": 31902, "stars": [], "topic_id": 41110, "date_created": 1309901107.076174, "message": "The calculation was a flight time of (in minutes):  (6 Ah) / (4 * x) * (60 min/hr)  where we assume the 4 motors together pull 4*x A from the battery, or x A each if they're pulling equally.", "group_id": 9523, "id": 1570665}, {"user_id": 31902, "stars": [], "topic_id": 41110, "date_created": 1309901167.828537, "message": "The numbers I gave are for x = 10A (9 min) and x = 5A (18 min)", "group_id": 9523, "id": 1570675}, {"user_id": 4330, "stars": [], "topic_id": 41110, "date_created": 1309901907.4304831, "message": "Hmm.. You're accounting for the necessary voltage remaining, in order for the LiPo not to die?", "group_id": 9523, "id": 1570758}, {"user_id": 31902, "stars": [], "topic_id": 41110, "date_created": 1309902320.2203791, "message": "Indeed.  Based on what I already know, I'd try to approach it in terms of power discharged, but I'm not sure what the horizontal axis is on a discharge curve anyway.", "group_id": 9523, "id": 1570809}, {"user_id": 31902, "stars": [], "topic_id": 41110, "date_created": 1309902124.6967871, "message": "Nope, that doesn't fit on my envelope.  Also not sure what that voltage is, haven't looked up the discharge curve for that battery, and don't know for sure how to calculate a time estimate from that info anyway.", "group_id": 9523, "id": 1570782}, {"user_id": 4330, "stars": [], "topic_id": 41110, "date_created": 1309902179.1499591, "message": "Yeah, little bit more than Ohm's Law going on there, methinks.", "group_id": 9523, "id": 1570792}]