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ProModeler Scorpion Power
HelicopterMain Discussion › Safe low voltage lipo. Are we selling ourselves short coming down at 3.8v per cell ?
05-02-2017 02:34 PM  3 months agoPost 81
Pistol_Pete

rrProfessor

Seffner, FL

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I have them set to go off if one cell hits as low as 3.4v.
That is great!
But for now when I use them, and hear the alarm, I'll drop down the head speed and it'll stop and I'll finish the pack out taking it easy without setting the alarm off again.
You got it!

Much better than relying on ESC cut off as it does not monitor individual cell voltage. The discharge graphs posted by wjvail (thanks) depicts why clearly.

~~Enjoying the hobby one flight at a time~~

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05-02-2017 02:49 PM  3 months agoPost 82
joshreynolds777

Senior Heliman

Willis, Tx

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Thanks Pete !
I'm learning.
I dunno what the frac I'm gonna do without this site.
I'm getting cold sores over it.

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05-06-2017 07:28 PM  3 months agoPost 83
heliraptor10

Key Veteran

kokomo, in-US

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Had a raptor e550 that I flew with a lipo alarm. Crashed it twice when it became unresponsive near the end of the timer.

Best guess was a brown out.

That's when I started using the timer exclusively,
Between that and always going into throttle hold to start,
Pack discharge became predictable.

My Goblin 500
Pulse 6s 4500
Comes in at 3.80 per cell at 5 minutes.

Timer all the way,
Don't push your packs,
Get more packs...
That's how I fly...

I'm usually a little jittery by the time I land at 5 minutes... So pushing for another minute doesn't seem worth it.

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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05-06-2017 11:52 PM  3 months agoPost 84
joshreynolds777

Senior Heliman

Willis, Tx

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Lol. I hear yah. Five minutes usually suits me just fine unless I'm really putting around.

What do you mean "throttle hold to start"
?

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05-06-2017 11:56 PM  3 months agoPost 85
heliraptor10

Key Veteran

kokomo, in-US

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3d mode.

I guess I'm saying it wrong...

Idle up is what most call it.

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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05-08-2017 02:35 PM  3 months agoPost 86
Pistol_Pete

rrProfessor

Seffner, FL

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Had a raptor e550 that I flew with a lipo alarm. Crashed it twice when it became unresponsive near the end of the timer.
Best guess was a brown out.
That's when I started using the timer exclusively,
Sorry to say I'm reading setup issues.

Setting the Lipo alarm to go off before ESC goes into cut-off could have avoided those crashes.

Tx timer can be set to go off before LiPo alarm as a means to let you know whats coming next so technically you get three warnings.

Brown out occurs when voltage dips below 3.8V

~~Enjoying the hobby one flight at a time~~

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05-08-2017 02:53 PM  3 months agoPost 87
Richardmid1

rrProfessor

Leeds, England

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Brown out occurs when voltage dips below 3.8V
That's a BEC/RX lipo issue though, not ESC LVC issue.

60% of the time, it works every time!

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05-08-2017 03:08 PM  3 months agoPost 88
Pistol_Pete

rrProfessor

Seffner, FL

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What do you mean "throttle hold to start"
You may, as a safety habit, start and end your flight with throttle hold engaged. This eliminates any possibility of heli spooling up if you accidentally bump your throttle stick.

If using SET RPM mode in your Castle ESC, your throttle curve numbers should look like;

Normal 0-30-30-30-30
Idle Up1 70-70-70-70-70
Idle Up2 100-100-100-100-100

Some do not use the first ZERO 0 on normal mode and instead use all 30.

This obligates you to start with throtle hold engaged since the ESC wont arm until it gets its expected low signal.

Another advantage of using all 30 in NORMAL mode is that you can also use a linear PITCH CURVE which will allow you to fly inverted at your lowest head speed without worrying about shutting down motor when throtle stick goes to lowest down position.

~~Enjoying the hobby one flight at a time~~

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05-08-2017 03:53 PM  3 months agoPost 89
Pistol_Pete

rrProfessor

Seffner, FL

My Posts: All  Forum  Topic

Brown out occurs when voltage dips below 3.8V

That's a BEC/RX lipo issue though, not ESC LVC issue.
FWIW, the ESC LVC and the brownout sentences are not in the same paragraph.

http://www.saidsimple.com/content/100835/

Troubleshoot what I cut and pasted in reference to his posting and see if it makes sense to you.

I'm here to help if needed.

~~Enjoying the hobby one flight at a time~~

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05-08-2017 04:44 PM  3 months agoPost 90
heliraptor10

Key Veteran

kokomo, in-US

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This was years ago

No troubleshooting necessary

I just brought it up as an example. To me, the low voltage alarm (it was an external monitor light that changed color) became an excuse to keep flying longer.

I would do a pass and see that things were in the green and keep going.

So just like I got rid of my radar detector (because it had become an excuse to speed),
I quit using the low voltage alarm.

I've been using the timer exclusively and I've never been happier. I've only forgotten to set it a couple times in hundreds of flights, and those went fine because of the "timer" in my head.

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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05-08-2017 05:51 PM  3 months agoPost 91
Pistol_Pete

rrProfessor

Seffner, FL

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Thanks for response. Figured your issues have been solved and the "troubleshooting" is meant for others to learn and apply where needed.

When I read LiPo "alarm", I assumed it was the most common "audible" used as posted earlier in this thread. The one you were using are the visual "lit fuel gauge" (fixed)

What I did find odd is that your heli became unresponsive and your best guess was a "brownout" and that by just eliminating LiPo "fuel gauge" and relying exclusively on Tx timer, all is well. It left me wondering about the ESC LVC setting which cut power to motor but not servos.

A BEC issue as stated by Richard would have still been an issue regardless of Tx timer and ESC LVC setting.

Hope this helps clarify my post.

~~Enjoying the hobby one flight at a time~~

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05-08-2017 06:39 PM  3 months agoPost 92
EEngineer

Elite Veteran

TX

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"Brown out occurs when voltage dips below 3.8V "

Closer to 3.5V. Depends on the RX/FBL.....

And such an occurrence need only be for microseconds.

Logo 600SXs, 700XX, 800XX

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05-09-2017 10:09 AM  3 months agoPost 93
heliraptor10

Key Veteran

kokomo, in-US

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I've been misinterpreted enough recently that I just wanted it to be clear that I didn't even have that Heli anymore.

I didn't want to get people asking me if I figured it out fixed the issue...lol.

My second best guess was a static discharge due to over tension on the belt and all the tensioning rollers on the raptor. There's a lot of argument about that subject whether or not it really acts as a van der graf generator or not, whether to ground the boom,... silicone spray...

And it all became moot when I had a friend resolder my esc. He did the positive negative battery leads backwards and it fried when I hooked it up. (I made it a point to learn to solder after that)
I was already down to wooden blades and a metal boom (my beautiful carbon fiber perished in the previous crash)
So in my head this was some sort of final straw, wherein I decided to sell her as opposed to fixing her.

I've never had this problem with other helis, belt or no, tensioners with and without. One thing that was different about the raptor,
The tensioners were plastic, whereas every other heli I have experience with, they were metal.

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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05-09-2017 05:35 PM  3 months agoPost 94
EEngineer

Elite Veteran

TX

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"And it all became moot when I had a friend resolder my esc. He did the positive negative battery leads backwards and it fried when I hooked it up. (I made it a point to learn to solder after that) "

Is he still your friend?....

Has nothing to do with soldering, but a lot to do with attention to detail....

Logo 600SXs, 700XX, 800XX

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05-10-2017 12:56 PM  3 months agoPost 95
heliraptor10

Key Veteran

kokomo, in-US

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We drifted apart when I quit drinking.

And yes
It was something I could have prevented if I had double checked. Hence the fact that I took responsibility and decided I needed to be able to do it myself.

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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05-10-2017 05:02 PM  3 months agoPost 96
EEngineer

Elite Veteran

TX

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"I took responsibility "

To bad your "friend" didn't, huh?

Logo 600SXs, 700XX, 800XX

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05-10-2017 07:29 PM  3 months agoPost 97
heliraptor10

Key Veteran

kokomo, in-US

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Well it was my fault for not double checking his work.

We had a talk about that early on, owner ship of models and working on them and flying each other's stuff.

It can get complex, and feelings can get hurt if you don't have any frame of reference. If I was flying one of his models that he asked me to fly to check something then I would not be responsible. If it was flying it just because I wanted to and I did something stupid, then of course it would be on me.

I only crashed one thing of his

A T-Rex 600.

He bought the kit and assembled it all by the book and asked me to fly it. I tried to convince him it would be just like his little 450 only easier. He insisted I do it. And with the cause of the crash it wouldn't have mattered.

He assembled the flybar seesaw cage inverse.
I did not catch it when I inspected.

I spooled her up slow in normal mode as was my usual way... Any time I got near any kind of throttle for lift it started to shake,
So killed it and said, " Something's not right"
He says, "that's just ground effect. goose it"
He got into helis because of me,
But at this point I had 2 years of experience and he had 1 so it was no longer like he knew nothing.

So I goosed it.
it threw it self sideways into the ground.

I felt horrible,
And pretty dumb when I realized what had happened.

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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05-10-2017 07:47 PM  3 months agoPost 98
EEngineer

Elite Veteran

TX

My Posts: All  Forum  Topic

"He did the positive negative battery leads backwards and it fried when I hooked it up."

How did it get off the ground with a "fried" ESC?....

Logo 600SXs, 700XX, 800XX

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05-11-2017 12:37 AM  3 months agoPost 99
heliraptor10

Key Veteran

kokomo, in-US

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2 different helis

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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05-11-2017 02:09 AM  3 months agoPost 100
EEngineer

Elite Veteran

TX

My Posts: All  Forum  Topic

You didn't mention that in your post....

Logo 600SXs, 700XX, 800XX

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ProModeler Scorpion Power
HelicopterMain Discussion › Safe low voltage lipo. Are we selling ourselves short coming down at 3.8v per cell ?
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