[NorseHammer]

I've been flying my Sniper on some older 8C 324P 6000 mah Kokam packs and 12C 3s2p 4900 mah Tanic Packs. This means heavy parallel packs to feed the 40 amps draw of my HET 2 wind motor. The plane flys well at high speed but drops like a rock when you throttle back, so I've ordered a pair of Polyquest Li-Po 2100mAh 3-Cell 20C packs to reduce the weight the sniper carries aloft. I'm wondering what the "C" rating is for some of the other packs Great Hobbies lists and what success anybody has had with them?
Should one treat these packs with no advertized "C" rating as 8C untill told different or what?

The three brands available from GH but without advertized "C" ratings are listed below

PRL4524 — LiPoly 3-Cell 2200mAh from Prolux
THP21003S - LiPo 2100mAh 3-Cell 11.1v 16GA From Thunder Power
HIF220L3 — LiPoly 3-Cell 2200mAh From HiFlight

Curiouse Northern EDF Flyer

[rdespins]

I don't want to stir the futaba/JR type of pot, but from my LONG and intensive searches over the internet, Thunder Power Prolites are the best cell for power to weight ratio while holding the best voltage under load.

http://parts.rctoys.com/rc-toys-hobb...under%20Power/

its a Canadian site with US prices. I believe you can get free shipping. Make sure its the ProLites. If I recall they can do 12C continous 20C burst.

You won't be disapointed. They cost more for a reason.

Ron

[can773]

Originally Posted by rdespins

I don't want to stir the futaba/JR type of pot, but from my LONG and intensive searches over the internet, Thunder Power Prolites are the best cell for power to weight ratio while holding the best voltage under load.

http://parts.rctoys.com/rc-toys-hobb...under%20Power/

its a Canadian site with US prices. I believe you can get free shipping. Make sure its the ProLites. If I recall they can do 12C continous 20C burst.

You won't be disapointed. They cost more for a reason.

Ron

I would agree with Ron about the Prolites.

When ordering from Draganfly in Saskatoon (the website above) dont do it through the cart...

First drop an email to Adam for best pricing....its usually well worth it

adam.g@sasktel.net

[Tomahawk]

First drop an email to Adam for best pricing....its usually well worth it

Does he deal in Canadian funds also or just US funds?

Chris

[can773]

Originally Posted by Tomahawk

Does he deal in Canadian funds also or just US funds?

Chris

Chris,

They always deal in US funds, but trust me you wont get them anywhere else cheaper

[Tomahawk]

Thanks for the reply Chad.

I know some Canadian vendors list their products in US funds like Icare. If you send them an email they will give you a quote in Canadian funds.

Chris

[Rob]

I have to second the deal on the prolites from RCtoys. Drop Adam a email. trust me you wont be disapointed with the price he will quote you. i have 4 prolite 3CELL 2100mAH comming and a cc 45 amp ESC for what i thought was a great price .

[NorseHammer]

It comes down to weight for me on this particular application, I want to be able slow down and land at a reasonable speed for me. The HET 2 Wind sucks up 43 AMPS WOT which I want to have fun with for most of the flight, then slow down and land without banging up the thing to much more than I already have. The packs I fly with now weigh too much at 450 grams and are so big that I can't get them back far enough in the plane to have things bablance anywhere near the C of G, the plane is nose heavy with my old packs and a little unresponsive, I feel that the 2100mAh 3-Cell 20C Polyquest's 183 Grams and small size will allow the plane to balance on the C of G be a little more lively and slow down for gentler landings. The 4000mAh 3S2P 11.1v Prolites at 255 grams and Length: 185 mm, Width: 50 mm
Height: 17 mm would still be problem although they would definately give me improvement over my older packs. They will work well in my larger prop plane though, so I'll probably get them for that application.

[can773]

Originally Posted by NorseHammer

It comes down to weight for me on this particular application, I want to be able slow down and land at a reasonable speed for me. The HET 2 Wind sucks up 43 AMPS WOT which I want to have fun with for most of the flight, then slow down and land without banging up the thing to much more than I already have. The packs I fly with now weigh too much at 450 grams and are so big that I can't get them back far enough in the plane to have things bablance anywhere near the C of G, the plane is nose heavy with my old packs and a little unresponsive, I feel that the 2100mAh 3-Cell 20C Polyquest's 183 Grams and small size will allow the plane to balance on the C of G be a little more lively and slow down for gentler landings. The 4000mAh 3S2P 11.1v Prolites at 255 grams and Length: 185 mm, Width: 50 mm
Height: 17 mm would still be problem although they would definately give me improvement over my older packs. They will work well in my larger prop plane though, so I'll probably get them for that application.

Not really fair to compare a 2100 to a 4000 pack....

I think a 3s2p 2650 Prolite would be a more fair comparison at 168 grams and would work within your discharge rating (provided that your 42A is only bursting and not use all the time).

If you are flying WOT and pulling 42A continuous your cycle life is going to be low on either pack.

[NorseHammer]

Its 20c vs 10c continous, that is the problem. Prolites are only a 12C continous battery albeit a very good 12C battery. When they become available (it can't be very far down the road either) at 20C or thereabouts so we can get the 40+ amps continuos out of a 2100 or 2200 mah pack it'll be a day to celebrate for sure. The Comaprison that is important for this particular application was weight of packs actually capable of delivering 40+ amps continously. That meant compring some 3S1p packs to 3S2P packs fair or not, its what the parameters are. As has been pointed out the 4000 mah Prolite will deliver the power and at 255 grams its a pretty good alternative. I'll buy one of these packs as well. My EDF planes are most often goining to be flown WOT for that jet speed thrill. The planes are sleek and beg to be flown fast. This enthusiast or as some believe nutcase who owns them don't want to stooge around the patch at lower thottle settings until its time to land. Its an adreneline rush keeping up with these fast movers that has its own at times ex$pen$ive satisfaction. There are hotter motors out there that will draw more amps such as the New Hetrc edf 2W-20, 700 watts of power just think, feed it from a 4 cell source capable of delivering 45-50 amps and drive a wemotec mini fan and it'll give a thrust of 1300gr.

The only light single 4 cell packs that I know of that'll deliver 40+ amps continuos are the 20C 3200 Kokam at 410 grams, and the polyquest 2100mAh 4-Cell 20C at 235 grams BUT (some of you gotta love this but) your suggested Prolite TP4000-4S2P weighs in at only 338 grams so for a small 103 grams added in weight compared to the polyquest or compared to the Kokam for a 72 gram savings one gets added duration.

At the begining of all this rdespins wrote:
I don't want to stir the futaba/JR type of pot, but from my LONG and intensive searches over the internet, Thunder Power Prolites are the best cell for power to weight ratio while holding the best voltage under load.

So on that note just remember it turns out that there are some very competitve choices available out there, and they get better and better as time goes on, it's all to our benefit.


FYI LiPo battery data

Thunderpower is at
http://www.thunderpower-batteries.co...batteries.html

Polyquest is at aahttp://www.aircraft-world.com/prod_datasheets/polyquestxp.htm

Kokam is at
http://www.fmadirect.com/new_applica...3200/index.htm