ESC choice / RX or bec

[kenghock]

I'm thinking the e aurora and wanted to ask what esc to use. Choices from LHS are
CC ICE 120 HV ~$280
Jive 80HV ~$550

Is the Jive 80 enough for 12S 700 class? Don't really want to spend so much but I've heard of issues with castle reliability which was my other choice.

Thinking to run separate Rx battery. Is bec safe in such high power applications
Thanks
Ken

[Adrianli]

For me, I'll go with CC. I am using three CC85HV in three of my 600size heli. Two yrs old already since the last time it was returned from CC.

Previous firmware was crap, last firmware with Set RPM function, its stable.

[kenghock]

Thanks Adrian.

Are you using RX battery or bec? I was thinking of CC BEC pro but HF has some bad stories about it shorting out servos. WR superbec is 3 times the price though.
Ken

[Adrianli]

Thanks Adrian.

Are you using RX battery or bec? I was thinking of CC BEC pro but HF has some bad stories about it shorting out servos. WR superbec is 3 times the price though.
Ken

For my flybar helis, I use external BEC soldered in parallel with the esc battery wires.

For my FBL helis, I use external 2S lipo Rx battery connected with external linear BEC.

[feudallordcult]

replacement cc100a phoenix has served me well over 100flights thus far. comes down slightly warm after a 6min mild-3d flight. using separate align external 6a regulator with 2s lipo to power the servos. extra weight but I can still live with it. Same goes for the servos on my 6hv. Prob will do the same when I get my 700f3c or 7hv.

[kenghock]

Thanks guys

Why the preference for 2Slipo and BEC combo. I can understsnd going the battery route is safer at expense of weight and BEC is convenience but risk failure.

How do you setup both though? Can you show simple diagram?

If its for redundancy, I like the idea as its better to be safe.

Ken

[erwinseow]

The jive has a very very good bec. You do not need a separate bec if u are using the jive. So the cost difference isnt that much. After you use a kontronik... You wouldn't want to go with any other brands. ;)

[kenghock]

Thsnks Erwin.
I did look at the jive 120 but its double cost of castle 120 plus becpro. I plan to get around the latter's issue with 12S by running off 6S only. There's a link on rr that explains how.

Waiting for adrian and feduallord to show how I can also wire in an Rx battery for additional backup. Also toying with Fromenco DU-CP mark 2 as an alternative to a battery.

My goal is to get the eauroa in the air for under $2500.

[baby_zyklon]

You don't need a buffer pack with a cc bec pro or the jive bec. I had the bec pro powering 8 servos on a 13kg plane. Also had hundreds of hours on the bec pro powering electronics few hundred times the price of the bec itself. No issue at all.

Quite a few reported failure of the bec pro on hv.

$2500 w/o lipo is more than enough if you know where to shop.

[erwinseow]

Hi... For a 12S setup... 80HV is enough.

You can get the Jive 80HV at RCS. Price is quite reasonable. http://shop.radiocontrol-sports.com/...productId=2609

Good luck!

[kenghock]

Thanks guys.

[Adrianli]

Thanks guys

Why the preference for 2Slipo and BEC combo. I can understsnd going the battery route is safer at expense of weight and BEC is convenience but risk failure.

How do you setup both though? Can you show simple diagram?

If its for redundancy, I like the idea as its better to be safe.

Ken

My preference of external 2Slipo and BEC combo is to have a completely isolated power system in case there is a failure to the main battery pack. I still want to be able to auto-rotate to the ground when there is a failure mid-flight.

Once main battery failure, either lipo explore or soldering comes loose, u will lose ur power to the bec also thus no power to the servos for u to react to the situation and let the heli auto-rotate down.

With external 2Slipo and BEC combo, even with failure to main battery pack, I can still control the heli to safely auto-rotate to the ground. This is the same old school nitro heli thinking where external rx battery comes into play when engine is cut. I had a few unexpected auto-rotate situation during my flying experience. I normally use this combo for my more expensive heli setups, mainly multi-bladed scale heli setup.

Those that are for sports flying, an external BEC connected to the main battery pack will do.

Up to you to decide ur preference.

[kenghock]

Thanks Adrian. Just to ask how to do it, wire battery and bec in series?

I think I prefer old school as need to protect investement. To explore the thinking
1) If for emergencies only, then small battery capacity is ok?
2) Use lifepo as the power will hold in case forget to charge
OR
3) If place the BEC first, lifepo will be recharged in flight?

Other problem is I still don't know how to autorotate. Maybe should figure out how I can make a bail out parachute. I saw this on a small cessna. If there's a problem, cut throttle and activate parachute.

[Adrianli]

Thanks Adrian. Just to ask how to do it, wire battery and bec in series?

I think I prefer old school as need to protect investement. To explore the thinking
1) If for emergencies only, then small battery capacity is ok?
2) Use lifepo as the power will hold in case forget to charge
OR
3) If place the BEC first, lifepo will be recharged in flight?

Other problem is I still don't know how to autorotate. Maybe should figure out how I can make a bail out parachute. I saw this on a small cessna. If there's a problem, cut throttle and activate parachute.

Hur??? i dont understand the question in red.


If u use external BEC + 2S lipo, it powers all ur rx, servo and gyro. It is an independent power source. Not emergency only. The 2S lipo capacity I run is either a 1300mah or 2200mah pack. Each flight(8mins), total consumption is abt 150mah.

If u intend to run 2S li-fe directly, check ur servos and gyro able to take the voltage(6.6v).

[kenghock]

Opps vague question, sorry. I wanted to ask what the circuit diagram to use both a BEC and 2S lipo looks like.

1) Do I run the BEC from main battery as a separate source from the lipo? This means the RX then has 2 power sources to backup each other.

2) Would it better to get a regulator in this case?