Terry Plumridge 1 Posted November 7, 2021 Share Posted November 7, 2021 I am using 2S Lipo and a 10 amp ESC. The bullet connectors on both ESC and motor leads are too big and very difficult to disconnect. Would it be ok to use servo extension lead connectors instead? They are 3 wire and easy to seperate. Quote Link to comment Share on other sites More sharing options...
ken anderson. Posted November 7, 2021 Share Posted November 7, 2021 (edited) hello terry,i wouldnt even think about using the servo lead for a battery,probably overheat and melt. Far better send off for some matching connectors. ken anderson...ne...1...melting dept. Edited November 7, 2021 by ken anderson. link didn't work due to me. Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted November 7, 2021 Share Posted November 7, 2021 You should only have to make that connection once. Depending on the motor and ESC size these could involve a number of different connector sizes 2mm, 3.5mm and 4mm are common. For the sizes that you are speaking of maybe even something finer. Personally I'd consider the wire in the typical servo extension lead far too thin to use for motor power. Those thin wires aren;t really much use for more than a couple of amps. Quote Link to comment Share on other sites More sharing options...
Shaun Walsh Posted November 7, 2021 Share Posted November 7, 2021 If the bullet connectors are too big cut them off and solder on 2mm bullet connectors or MT30 style connectors. The fact that they are hard to disconnect is a good thing, don't want them coming apart in flight ? 1 Quote Link to comment Share on other sites More sharing options...
EvilC57 Posted November 7, 2021 Share Posted November 7, 2021 Or try these. But don’t even consider servo cables or connectors for motor power. Quote Link to comment Share on other sites More sharing options...
MattyB Posted November 7, 2021 Share Posted November 7, 2021 2 hours ago, Terry Plumridge 1 said: I am using 2S Lipo and a 10 amp ESC. The bullet connectors on both ESC and motor leads are too big and very difficult to disconnect. Would it be ok to use servo extension lead connectors instead? They are 3 wire and easy to seperate. Short answer - no, definitely not! Long answer - Wires need to be the right diameter for the current they need to carry. If in doubt consult an online data sheet such as this which gives the rough current capacity if wires of different diameter. Always size with a bit of excess current carrying capacity to avoid any chance of a failure. Quote Link to comment Share on other sites More sharing options...
Geoff S Posted November 7, 2021 Share Posted November 7, 2021 As everyone else has said, definitely don't attempt to use a servo connector for an esc to motor connection. With small electric models I tend to use 2mm bullet connectors but, as the connection is rarely (if ever) disconnected I've also not bothered with connectors at all and simply soldered the wires together once I've determined rotation direction is correct. 1 Quote Link to comment Share on other sites More sharing options...
PatMc Posted November 7, 2021 Share Posted November 7, 2021 On a small model where space is tight you could probably solder the three connections permanently using heat-shrink to insulate the joints, after all you're unlikely to want to disconnect the motor - ESC anyway. First make one permanent joint & two (insulated) temporary joints, check the direction the motor is turning, reverse the temp joints if necessary. When the running direction is established making the joints permanent. 2 Quote Link to comment Share on other sites More sharing options...
Sparks Posted November 7, 2021 Share Posted November 7, 2021 These are quite neat for small Motor/ESC connection 3 way X30 Connector Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted November 7, 2021 Share Posted November 7, 2021 Those look like they are polarised in a block of three - so you would need to establish that the connections were correct for motor direction. Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted November 7, 2021 Share Posted November 7, 2021 9 hours ago, PatMc said: On a small model where space is tight you could probably solder the three connections permanently using heat-shrink to insulate the joints, after all you're unlikely to want to disconnect the motor - ESC anyway. First make one permanent joint & two (insulated) temporary joints, check the direction the motor is turning, reverse the temp joints if necessary. When the running direction is established making the joints permanent. Yup. Perfect solution. If you DO need to disconnect, just a swife of a knife, and a dab of the soldering iron... Quote Link to comment Share on other sites More sharing options...
Terry Plumridge 1 Posted November 8, 2021 Author Share Posted November 8, 2021 Thanks for the replies, all comments duly noted. ? Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted November 8, 2021 Share Posted November 8, 2021 Just an observation but most simple planes are likely to suffer damage from "unwanted contact with the ground" and need to be repaired well before any electric component is likely to need replacing. For security and to save weight, particularly where space is limited, I tend to solder and shrink wrap every 'in line' connection except where the plane has to be taken apart for transport. After all the only thing that must be disconnected after each flight is the battery. Quote Link to comment Share on other sites More sharing options...
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