Opti-power packs are here ;-)

[Smoothound]

260mAh a minute from a 500 is pretty low in my opinion but I could be wrong. I certainly pull more than that poncing about!!!

[Rctintin]

Picked mine up today, Thanks Andy.

Busy fitting EC5's tonight.

Havent checked the weight difference against my current Turnigy's but certainly a lot lighter that's for sure.

F..K ME!! thats over a grands worth!!

You doing 23 hours a day Taxi driving Tim?

[cjcj1949]

My question about C rating is how is it derived. You say it is based on the current value that a cell can produce without immediate damage. Does this mean that if a cell is used at 25 Centigrade under the same airflow conditions that it was tested under that it will last just 1 flight. I am an Engineer and I was really looking for a way of relating C rating to cell lifetime for a given current load. I know that is only a guide as actual use involves variable current load depending on how hard you fly. I would just like a clear statement on C rating so that a pack can be tested under controlled conditions and the manufacturers claims validated. It would also be good to know the best pack temperature for maximum life. Packs can be packaged so that all cells can operate at the same temperature, and cooling or heating could be worthwhile for more expensive packs. C rating to me should mean the current at which a pack can be used repeatedly. I've found that 25C packs are ok for 10C use. Basic hovering with gentle acceleration. I am now flying using full negative and positive collective with fairly rapid changes, probably gentle 3D and it sounds that 35C will be required.

I agree that C rating is a bit academic at the moment as manufactures seem to use C rating more for marketing than anything meaningful. Tipple cells have been good for the price (for me and those I know), hopefully your cells can take us further forward. It is good to see some feedback and some gaurantees on quality. Especially the crashback.

[PeteStewardson]

Pete,

He certainly is (all paid for however), I look forward to seeing the LOGO kicking arse this weekend!

Might even get my 450 out or my little Macko delta! TREX700 waiting for new ESC from Castle and 550 needs setup completing, 500 ready to rock and trusty 700N waiting to slurp up some more 20SLV.

Andy

Yeah I guess it's a double edge sword. Lucky as he has lots of nice new packs, unlucky as he's on bread & water for the rest of the year

[Guest]

If you have a have a 650 mili amp hour pack, it can deliver a flow of .650 amps’ (650 miliamps) for one hour. If you draw it out faster, it doesn't last as long. So your motor might pull 6.5 amps for 1/10 of an hour, or about 6 minutes. An 1100 mAh pack has double the capacity of the 650 mAh pack, so it should last "about" twice as long.

If you have a 3000 mAh pack - any kind - and it is rated at 10 C that means
it can deliver 30 amps if rated at 30C it could deliver 90 amps.

So if you use a 3000 30C pack you can deliver 90amps continuously in our case you can deliver around 150 amps continuously but plainly the time would be short.

So what about a real life set of data:

One of the top UK 3D Pilots using 2 * 5000 mAh 6S cells (12S) and flying as hard as possible can do the following:-

ACTUAL FLIGHT STATISTICS

Flight Time 4 mins 53 sec


Average Volts across flight 45.07


Min/Max Cell Volts 41.3v and 50.08v


Average Current for flight 45.33 amps


Max burst Current during flight 160.1


Average volts/Cell for flight 3.76


Min Volts 3.43v





Max Volts 4.17

(This was in excel so formatting gone a bit wonky)

This is a typical set of data from a test pilot running 5000mAh 12S setup. We have yet to see any pilot draw more than 50 amps average and the max burst current seen so far is from memory 191 amps for 0.2 of a second.

You can see the average voltage across the flight was 3.76 and on landing the voltage hold was still 3.715V/cell. No real heat in pack and the current being drawn is at around 10C average!

I all cases so far with well in excess of 1000 flights across all testers (fixed wing and Heli) the results are along the same lines except fixed wing currents are generally lower.

I trust this helps?

[Zeeflyboy]

Have you considered some 1S 300mah mCP X cells? Those would sell like candy!

[LaurenceGough]

After having two nano-techs puff after 12 cycles and now practically unsafe at 18 cycles I'm not such a fan of them..

My Hyperion VX's 3300mAh 6S have all been going strong coming up to 100 cycles now with no loss of power.

This morning I received these Optipower packs to test and review from Optifuel.

I will start a new thread after I have acquired cycles on them.

So far I am very impressed with the quality, they appear to be well made packs and made with good quality, flexible wires.

[t-rex pedro]

I received two 3600mAh Rx packs yesterday. I am running an 8v unregulated system so the additional capacity over my normal 2500mAh packs should mean an extra flight or two between charges. Also, the slight increase in weight of the larger pack balances my 700 perfectly.

Cheers

[cjcj1949]

I have a feeling it's not worth testing these packs. I think they are going to be very good. Using them seems a good idea though.

[muscleflex]

F..K ME!! thats over a grands worth!!

You doing 23 hours a day Taxi driving Tim?

Can you say sponsor discount? ;P