I am very interested in buying this little devil : cap 232


Problem is that i don't know wether or not this plane can be equipped with lipoly cells. I know li-poly's only handle 3C current draws so you always have to compromise between weight and numbre of cells in parallel.

Actually my question doesn't only concern this little cap but goes for all electric planes : Is there a weight - size - motor combination that just doesn't fly well on lipoly because it needs too much parallel cells thus weighing too much?

for example: smaller foamies with larger wing sections seem too be doing very well on simple speed 300's and li poly's. But once more power is needed because of weight gain from the plane thus needing a stronger possibly brushless engine with larger current draw, could it be that poly's aren't the best choice performance wise ?????



Pfff i hope i made myself clear

My main problem actually is that i don't want to pay more for the cap if it turns out it can't be flown AND prop hanged on li poly's like simple EPP foamies do like the cobra and the eagle....eventough both just have a brushed motor and the suggested setup for the cap is a brushless.

Maybe i should just go for the durability and low cost of the foamies but this little cap looks so good.

I have never flown electric and li-poly technology finally made electic appealing to me. I really like the idea of flying several 5 minute flights on one charge wothout the need for trickle charging.

Also, when coupling several li poly's in parallel...doesn't that implicate the need for longer charge times? Or do you normally take the risk of charging them parallel with the danger of rendering a pack unbalanced?

My ideal would be one hour charging , 20 minutes flying. Is that possible on ANY of the higher performance electrics, foamie or fiberglass fuselage????


ALOT of questions , again i am new to electrics but it sure looks more interesting then say 2 years ago.

Hi,

The JanR CAP 232 is indeed a beauty! Since it is a small wingspan high performance aerobat...make sure that you have the experience to fly it properly!

As for using Lithium Polymer to power, the answer to your questions are mostly all "yes".

Lithium power outperforms NiCd and NiMH technologies because the weight to power density is so much improved. In other words, you always win the weight to power battle when you pick Lithium Polymer technology.

So, what's the catch? Pricing. You'll pay more for this technology...at least today.

The JanR CAP 232 is recommended by Hobby Lobby to use an AXI 2808/16 brushless motor that draws 20-22amps. The recommended 7-cell, 1700mAH pack weighs 9.7oz.

To replace the pack with Lithium, you need to deliver 20-22amps continuous, or, at the very least, peak short term.

For one example, the Kokam 1200HC cell delivers 6amps continuous and about 10amps peak short term. A 2-cell Lithium pack in series can replace a 6 or 7 cell NiCd pack. Therefore, a 2s3p pack of Kokam 1200HC cells will provide 7.2 volts under load and deliver 18amps continuous or 30amps peak short term.

The good news is that the 2s3p Kokam 1200HC pack weighs only 6.4oz and gives you a total capacity of 3600mAh. This is a 3.3oz weight reduction over the 7-cell 1700mAh pack and double the flight duration!

The baqd news is that the cost is $108 compared to the $59 for the 1700 pack.

Finally...yes, you can charge the whole pack together within an hour and fly again.

Regards.

wow

Check the "Wattage Cap 232". Its only $99.00 and nicer...