Cr0-Magnon Posted February 25, 2021 Share Posted February 25, 2021 Noob question I know but just picked up a Specna Arms SA-E01 Edge 2.0, which comes with a Gate Aster pre-installed. So far I'm pretty impressed and looking forward to skirmishing it. However whilst the trigger response seems fine, full-auto with a 7.4V lipo battery is pretty lacklustre at 11rps. I don't need 30rps or anything like that but would like to get the most out of it. Is 7.4V still recommended or would it be fine with a 11.1V? Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted February 25, 2021 Supporters Share Posted February 25, 2021 With lame or low speed motors you gotta use 11.1v to get some snap it won't go nutz, just about x 1.55 of what 7.4v speed/rof is so 11rps on 7.4v will equate to around 17rps on similar spec 11.1v might nudge 18rps if lucky as high tpa motors spin a bit more on 11.1v and low tpa motors spin a little less that x1.55 on higher lipo's it is to do with max efficiency/potential of motor being reached on different motors but general rule of thumb is 11.1v is about 1.55 rof over a 7.4v lipo it is going to be a 27tpa/18k motor in there say so 11.1v will kick it up to say 28,000rpm hardly insane rpm - so should be OK though very fast motors like 40,000+ will spin ultra quick & brushes will wear faster putting more juice/volts through it & higher rpm will cause the brushes to wear a bit more but 18rps is not too mental imho & you need it somewhere near that as 11rps is too low when in the thick of it all kicking off and if/when eventually the old stock motor craps out, shove in a better one & 7.4v TL-DR - YOU'LL BE FINE Link to comment Share on other sites More sharing options...
Cr0-Magnon Posted February 25, 2021 Author Share Posted February 25, 2021 Cheers! Link to comment Share on other sites More sharing options...
Cr0-Magnon Posted February 27, 2021 Author Share Posted February 27, 2021 @Sitting Duck - You weren't far off. With a fully charged 7.4, I was getting 750rpm. On a 11.1 it's bumped up to 1200. Which is about perfect for me and doesn't seem crazy fast. Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted February 27, 2021 Supporters Share Posted February 27, 2021 1 hour ago, Cr0-Magnon said: @Sitting Duck - You weren't far off. With a fully charged 7.4, I was getting 750rpm. On a 11.1 it's bumped up to 1200. Which is about perfect for me and doesn't seem crazy fast. 750rpm = 12.5rps 12.5 x 1.55 = 19.375rps it is ROUGHLY about 55% on a 11.1v compared to a 7.4v BUT different batteries/burst/capacity & brand can produce a bit of difference As said torquey 27tpa on 11.1v you get a bit more than 55% crazy speed motors a little bit less as there is a limit to motor performance somewhere between 18rps to say 24rps is about right imho without being a dick - plenty of snap without risk of getting slapped if go a bit nutz twenties is plenty & all that Cyma AK 028 with fixed stock, jam a schottky diode across motor (if you can't be arsed to install a mosfet) and just use 11.1v - snap without going too nutz or chucking loads of money at it if/when she plays up, then consider upgrades & decent 7.4v but 11.1v on lame motor (with diode/mosfet) is an easy cheap boost just bought some of these last week when they were on offer at £6... https://hobbyking.com/en_us/rhino-2200mah-3s-25c-lipo-battery-pack-w-xt60.html?wrh_pdp=1 fucking short balance lead but £6 - c'mon Link to comment Share on other sites More sharing options...
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