Three days of messing with new lipolys on helimax
What a change. This is like a new heli
I can hover like never before. Not sure why???

Current is good.

Not sure ???

LiPo can deliver higher current and voltage, thus more power and better control in the end. It probably also increased your head speed, which will also stabilize the heli (to a point).

markzr7,

Which Lipo and charger did you end up going with?

just upgraded to a LIPO DN brand 3s 1350mah 20c 11.1 volt[8D]


http://www.readyheli.com/DN_Power_3S...p20c13503s.htm

the helimax cp rocks now, 10 minute flight times, increased main roter head speed. and the battery weighs more, not sure how much I will have to get out the gram scale and weight it.

the battery is longer so it moves the C.G. of the heli towards the nose a little so it needs more foreward trim on the radio to hold a hover, I like the way it flies

Are you able to put your canapy on ????
With my common sense 3 cell no go

YES indeed, the canopy fits on the Heli with the LIPO installed

OOps! Bought the wrong size Lipo.

I've found that 69-70mm is about the max length a Li-Po can be and still fit under the canopy.

I agree with the 70mm dimension the DN is

Weight: 116 grams w/ attached balance connector and attached jst connector
Size: 24mm x 35mm x 66mm

20C formula.

I'm running DN's as well, but 15C's, and they too measure 69mm with the wire and they just fit with the stock motor. When I switched to BL motors the can diameter on the main motor shrank to 20mm giving me more room for the pack which was and added bonus.

LIPO DN brand 3s 1350mah 20c 11.1 volt

I have 2 of these packs now, I bought another I am so pleased with the first one.

12 minute flight time on the AXE CP and the cells have 3.2 volts left in them when I plug them into the balancer.

I flying figure 8's and ovals and boxes, nothing fancy.

I got 30 minutes of flight time in tonight

Question on using lipo batteries on the axe cp. Cutoff voltage on most ESC's is 2.8 or 3 volts. I have no idea what the cutoff voltage is on the axe ESC, if there is one. It would not be a good idea if the ESC cut off a 3 volts if you were five or six feed off the ground! If you run an lipo till it will no longer lift off or even slows down, how do you know if you have drained the battery down below the 3 volts per cell? Using a volt meter after the battery has been removed from the chopper does not put a load on the battery. The last post said his balancer showed over 3 volts per cell. My balancer just has a green and red LED. It tells you nothing.

I prefer ESCs that you can disable the cutoff or set it to an absurdly low value on helicopters. You just don't have enough momentum in a heli to want to have the motor cut off without your control.

The best way to calibrate your flights is to use a good charger that will tell you how much charge is going back into the battery, then you can increase or decrease your flight times to get the right discharge. Timing your flights so that you use 80% of the capacity is a good rule of thumb.

Most people use a timer or LV alarm with Li-Po's. The Axe's OE ESC cuts off voltage too low to be useful with a Li-Po. Don't trust it to cut your voltage.

Also the Axe has kinda generic electronics (not many options). Even my $20 BL ESC from United Hobbies has an adjustable cut-off as well as a soft-cut feature. Right now my ESC cuts out at about 9.3 volts under load and since soft-cut is selected the heli just settles to the ground slowly when LV cut off is reached. I also time my flights with the 7C's timer.

Of course these settings are for the main ESC. For the tail ESC you want it to have an adjustable LV cut-off too, but set it as low as possible so the tail doesn't cut out.

Thanks osterizer and Heliko. Thats what I figured. I have a 3 cell 800 mAh Li-Po. I have flown it several times but not very long at a time. I think for now I will stick with the stock batteries. Thanks to Heliko I have three batteries. I will stick to using the Li-Po in my fixed wing airplane for now.

About those Lipo's, I hear ya Brother!! I bought a couple of Thunder Power 1320's. They're an 11.1 v 3 cell setup and I get about 12 minutes or better of solid flight time. I got the hover thing down and I'm flying my Axe all over my l house where I have high ceilings. I still keep the tail facing toward me tough since I'm just getting the hang of it. I haven't had a chance to fly it outside yet. It's been very windy being as it's hurricane season; I live in Florida. But I can terrorize my cat though! It's like Vietman!!


EM