Mouldy Posted October 11, 2007 Author Share Posted October 11, 2007 Ah! My Guru of all things leccy returns! Lipo Sack landed on the door mat this morning, along with lots of other goodies including a watt meter Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted October 11, 2007 Share Posted October 11, 2007 You now have my increasing respect, after all, you have bought a wattmeter...and no self respecting leccy flyer ( or slimer who is openminded enough to try it properly ) should ever attempt to run a setup without one Quote Link to comment Share on other sites More sharing options...
Mouldy Posted October 12, 2007 Author Share Posted October 12, 2007 I Agree whole heartedly and whats more Ill tell you why!My father has been badgering me no end to get back into flying. So around 5 weeks back we walked into Hobby Stores in Southampton. walked out with a Rainbow, an Axi 26020/8 and ESC and two 3S 2100 16C packs, (Impulse, which Im pretty sure is Ripmax).Anyway weve flown it and off the back of that I bought the Ketana. However! As the Ketana isnt yet ready to try the meter, I tried it on the Rainbow and guess what? The whole setup is wrong! Motor is pulling 46A WOT. The ESC is only rated at 35A and if Ive learnt anything at all,(!), the battery is rated at 33.6A discharge.So I have another X70 Sbec pro on the way along with a selection of props to unload the motor to try and relieve the batteries Now am I a good student or what? Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted October 12, 2007 Share Posted October 12, 2007 Ah grasshopper.....you have learned well the mysteries of elecktrickery Here is lesson 2.You have probably got away with not burning out the ESC because of 2 things. a) Most ( but certainly not all ) ESCs can stand short bursts of high current above their rated specs.b) The motor unloads quite a lot in the air, and this will see a consequential drop in current drawn by anything up to 25%. I just hope that the batteries have not been strained too far, and here is lesson 3.Despite a fairly heated argument in another thread some time ago about the merits or otherwise of pushing packs to their limit, ( and yours exceeded them by over 30% static ) I assure you that their life WILL be shortened if you choose to run at or very close too the maximum C rate. FWIW, I personally use packs with a C rating such, that at W.O.T static, the setup pulls around 50% C. So in other words, if I get say 30A at WOT static, I choose a pack with around 60A capability, probably something like a 2200m/a ( popular capacity ) 25C would do me, ( 55A max ) . Finally grasshopper.....beware the man who says his packs are capable of HUGE C ratings, because Confucius he say..... man who flys at 60C stays up for only one minute!Well done grasshopper....now go and have a rest with a cup of coffee and a nice sticky bun Quote Link to comment Share on other sites More sharing options...
Mouldy Posted October 12, 2007 Author Share Posted October 12, 2007 mmmmmmmmmmmmmmm sticky buns!!! ....and now with my newly learned knowledge and newly aquired equipment I can tune for maximum smoke!!! Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted October 12, 2007 Share Posted October 12, 2007 Ah the magic smoke... this is usually only found in the presence of fools grasshopper Quote Link to comment Share on other sites More sharing options...
Mouldy Posted October 12, 2007 Author Share Posted October 12, 2007 talking of which, had a gander at that link I posted to do with Li-Po experiments? Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted October 12, 2007 Share Posted October 12, 2007 come on now mouldy.....have you lost faith in my ability to respond to your postingsOh sorry, it was actually a whole half an hour or so before I responded. must try harder Quote Link to comment Share on other sites More sharing options...
Mouldy Posted October 12, 2007 Author Share Posted October 12, 2007 hehehe! Wasnt my intention to show a lack of faith! Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted October 12, 2007 Share Posted October 12, 2007 You are forgiven grasshopper........Now I am going to shower and get dressed for the day as I have been sitting here typing since I climbed out of my pit about 2 hours ago, as wifey keeps reminding me every 2 mins !!CUL8r after coffee and croissants Quote Link to comment Share on other sites More sharing options...
Mouldy Posted October 12, 2007 Author Share Posted October 12, 2007 enjoy! Quote Link to comment Share on other sites More sharing options...
Tiger E Posted October 15, 2007 Share Posted October 15, 2007 RCM & E Magazine - Winter 2007 issueNigel Hawes seems to be a little confused in respect to the chemistry of Li-Po's. On Page 45 of the abovesaid issue, in the article "Hard Cell" he states the chemistry as being "Lithium Cobalt Peroxide", yet on Page 69 of the same issue, in the article "Electric success!" he states the chemistry as being "Lithium Cobalt Dioxide".It appears the only thing inherently unstable here, is Nigel description of Li-Po chemistry. Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted October 15, 2007 Share Posted October 15, 2007 This may help.....http://en.wikipedia.org/wiki/Lithium_polymer Quote Link to comment Share on other sites More sharing options...
David Ashby - Moderator Posted October 22, 2007 Share Posted October 22, 2007 Thanks Nik, we'll slap his wrist.. Quote Link to comment Share on other sites More sharing options...
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