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Efficiency test, what setup is best??

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Old May 31st, 2014, 17:12   #16
SuperHog
 
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Your Lipo better not drop below 3.5V, or it will get damaged. Although 3.0V is the safest lowest voltage, an airsoft gun is like an on/off switch when it fires and will easily pulled the voltage suddenly from 3.5V down to 3.0V during firing.

A fully charged Lipo will last you all day up to 10+ mags easily. I always bring a second Lipo pack but never had to use it.
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Old May 31st, 2014, 19:19   #17
ThunderCactus
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My 1200mah sticks last about 1200-1400 rounds in my ptw
But the same battery would easily last 5000 rounds in my 249

I don't care how long your gun lasts on a battery, I want to know how long it COULD last. When you're forced to use tiny 800-1200mah lipo's, you tend to want to squeeze every bit of efficiency out of the gun.
When I build a new LMG or rifle, I have a choice between a high and low gear ratio, and I have absolutely no idea which one is actually more efficient right now on semi or full.
My assumption is that a high amperage setup on a 7.4v lipo would ultimately net better battery efficiency at the same rate of fire on full auto, and a low torque setup would likely net better battery life on a semi-auto rifle, but unfortunately I don't have either gun with that setup to try it myself, and few people seem to keep track of their battery life.

As far as the testing of the gun, with the watt meter we're testing with fully charged batteries. It's more accurate as a basis for comparison. Whether you test over a day, or just in x rounds at home, just include the test procedure so we can run the same test.

BBs/mah may seem like a rough calculation, but as long as your mag count is accurate, it accounts for any variation in voltage and amperage since you're calculating your efficiency over the life of the battery.

If your point is that a high amperage setup might end up drawing too much current for the battery to handle; 1) that has nothing to do with this test, and 2) your point is moot because no one in their right mind would continue to purchase and run their gun off that battery since it would suffer from over-current draw and eventually fail, so it's not an issue.

So can we stop theorizing and just do some testing already? lol
My watt meter is on order, but I ordered some new batts as well, waiting for those to come back in stock. They're the popular ones so I don't think it should be a long wait.
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Old May 31st, 2014, 22:59   #18
SuperHog
 
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What about using the Xcortech X3300W.
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Old June 1st, 2014, 00:22   #19
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Last weekend, my new batteries lasted in excess of 2000 rounds with an M140. With the Orga loss, I get 405-410 fps, but in another PTW it gets about 445 fps.

I changed batteries when I thought it was way overdue, actual count could be higher.

They are 11.1V 1200mah branded Valken. OE manufacturer unknown.
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Old June 1st, 2014, 17:43   #20
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PTW M130 cylinder running 422fps last night genuine Tack motor.

1400 mah systema PTW branded battery lasted my in excess of 2000 rounds ~15 or so mags. Went from fully charged 4.2v on each cell down to ~3.76
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Old June 1st, 2014, 18:22   #21
ThunderCactus
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That will come in handy when I decide to put ptw internals in an LMG lol
The voltage reading means nothing though, do you remember how many Mah you put back into the battery?
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Old June 1st, 2014, 18:45   #22
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Yes.

My battery have been "fully" charged since 2013.

I run gaz guns ever since.
yup
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