Mike downs 1 Posted December 28, 2023 Share Posted December 28, 2023 Advice requested for the following i I am building a 4 motor set up and when trying out have the following results set up as follows 4XA2212/6T motors props. 6X4 ESC 4 off bog standard 40 Amp unbranded ( from China) battery 3700 3 s wheh hooked up to a watt meter here are the results A 63. W 570. V 11.1 an I right In thinking that I need 80 A ESC’s Any comments and advice great fully received Quote Link to comment Share on other sites More sharing options...
Outrunner Posted December 28, 2023 Share Posted December 28, 2023 Your 40A ESC's are big enough. The 63A figure is shared between 4 controllers so each one is is seeing 15.75A What model are they going in? Quote Link to comment Share on other sites More sharing options...
Martin Gay Posted December 28, 2023 Share Posted December 28, 2023 Mike, Outrunner beat me to the same reply! Quote Link to comment Share on other sites More sharing options...
Mike downs 1 Posted December 28, 2023 Author Share Posted December 28, 2023 Many thanks guys. I have built a flying wing 4 Quote Link to comment Share on other sites More sharing options...
Outrunner Posted December 28, 2023 Share Posted December 28, 2023 Wow! Quote Link to comment Share on other sites More sharing options...
Futura57 Posted December 29, 2023 Share Posted December 29, 2023 12 hours ago, Mike downs 1 said: Many thanks guys. I have built a flying wing It's only a 'flying' wing if it flies 🤣 Good luck with the maiden flight. Quote Link to comment Share on other sites More sharing options...
Mike downs 1 Posted December 29, 2023 Author Share Posted December 29, 2023 It flies well enough with the set up of 5x3 props,I was hoping for a bit more by putting 6X4 props on. Hence the question to the forum. Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted December 29, 2023 Share Posted December 29, 2023 Mike downs 1 Just a point that can occur with electric multi motor designs. Where is the battery in relation to the motor ESCs? If the wire length between the battery and any ESC is over the provided wire length of the ESC and battery (about 10") then you are going to be putting an additional strain on the ESC's input capacitors due to inductance spikes. The longer the wires and the closer to the ESC's amps limit the worse the effect is. Failure tends to be time related so it can work well enough but it can also fail at any point and always when under load i.e. most likely when in flight! If the wires are really long it is possible to add additional capacitors but they have to be of the right type. There is no such limitation on wire length ESC to motor. I try to make sure the ESC(s) are as close to the battery as practical in both single and multi motor arrangements with appropriately long motor wires. In one rather extreme case they are no less than 45" long! 1 Quote Link to comment Share on other sites More sharing options...
Futura57 Posted December 29, 2023 Share Posted December 29, 2023 25 minutes ago, Simon Chaddock said: Mike downs 1 Just a point that can occur with electric multi motor designs. Where is the battery in relation to the motor ESCs? If the wire length between the battery and any ESC is over the provided wire length of the ESC and battery (about 10") then you are going to be putting an additional strain on the ESC's input capacitors due to inductance spikes. The longer the wires and the closer to the ESC's amps limit the worse the effect is. Failure tends to be time related so it can work well enough but it can also fail at any point and always when under load i.e. most likely when in flight! If the wires are really long it is possible to add additional capacitors but they have to be of the right type. There is no such limitation on wire length ESC to motor. I try to make sure the ESC(s) are as close to the battery as practical in both single and multi motor arrangements with appropriately long motor wires. In one rather extreme case they are no less than 45" long! Useful info for us all. Thanks 👍 Quote Link to comment Share on other sites More sharing options...
Mike downs 1 Posted December 30, 2023 Author Share Posted December 30, 2023 The two out board nacelles are 14” apart and the inboard nacelles are about 10”. hmm I will have to think about this. Thanks for the heads up. Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted December 30, 2023 Share Posted December 30, 2023 This was the first plane, a Depron EDF, where I had to seriously consider the length of the motor wires. To get the battery well forward to clear the duct inlets I placed the EDF right at the back, literally. This meat the distance between the motor and battery to achieve the correct CofG was about 32". Aware of the battery to ESC distance limitations I placed the ESC right behind the battery compartment with its cooling fingers out in the air steam. The length of the wires lead me to use lacquered solid copper wire (magnet wire) as for a given amp capacity it is only half the weight of the flexible silicone insulated wire normally used. Of course the fact that it is also a great deal cheaper has nothing to do with me using it.😉 I now tend to use magnet wire on all my multi engine planes but then they are all foam lightweights. 1 Quote Link to comment Share on other sites More sharing options...
Mike downs 1 Posted January 2 Author Share Posted January 2 Smart looking model! Quote Link to comment Share on other sites More sharing options...
Mike downs 1 Posted January 14 Author Share Posted January 14 As a point of interest you say that I should divide the amp reading by 4,does that apply to the Watt reading as well? Quote Link to comment Share on other sites More sharing options...
Christopher Wolfe Posted January 15 Share Posted January 15 Total Watts from battery 570. So just over 140 Watts per motor+ESC. * Chris * Quote Link to comment Share on other sites More sharing options...
Mike downs 1 Posted January 16 Author Share Posted January 16 Many thanks folks….just waiting for better weather now😀 Quote Link to comment Share on other sites More sharing options...
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