RE: ........."BELT-CP THREAD"........  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: Allfat
  Printable Version
       



All Forums >> RC Helicopters >> Electric RC Helis >> Esky Helicopters >> RE: ........."BELT-CP THREAD"........
Page: <<   < prev  56 57 [58] 59 60 61 62 63 64 65   next >   >>  

Login
Message << Older Topic   Newer Topic >>
RE: .........&quo... - 5/5/2008 8:43:29 PM   
evdreamer


 

Posts: 2430
Joined: 8/12/2007
From: Lincoln, NE, USA
Status: online 		What is the voltage after a flight? Does your ESC have voltage cut off options?

_____________________________

Since I started this hobby money seems to keep disappearing. :)
T-Rex 450SEV2, Gaui 200 SD

(in reply to droggy)
       Post #: 1426

RE: .........&quo... - 5/5/2008 9:47:44 PM   
droggy


 

Posts: 236
Joined: 3/22/2008
From: surrey, BC, CANADA
Status: offline 		voltage, 3.56, 3.55, 3.67. Instructions say the esc will turn off the motor when main power pack voltage falls under 5.3v. Speen controller equiped with protection functions that take care of correct start and operation of the motor across the whole range of RM, Current, and voltage

_____________________________

walkera 5#10 metal / falcon 40 / belt cp / blackhawk 450SE

(in reply to evdreamer)
       Post #: 1427

RE: .........&quo... - 5/6/2008 1:56:47 AM   
racinron122


 

Posts: 9
Joined: 2/22/2008
From: canton, MA, USA
Status: offline 		thanks for your help. im finding if i just use common sense and stop looking into this hobby to much it makes sense. again, thank you. ron

(in reply to evdreamer)
       Post #: 1428

RE: .........&quo... - 5/6/2008 3:42:38 AM   
Cyclic Hardover



Posts: 7224
Joined: 5/7/2002
From: New Mexico, USA
Status: offline 		From what I understand, it's not wise to let it get that low???

< Message edited by Cyclic Hardover -- 5/7/2008 3:10:45 AM >

_____________________________

Retired Army Aviator - Excuse Me! You sold me a hair with a cake around it!

(in reply to racinron122)
       Post #: 1429

RE: .........&quo... - 5/6/2008 5:10:26 AM   
evdreamer


 

Posts: 2430
Joined: 8/12/2007
From: Lincoln, NE, USA
Status: online 		I am with Cyclic hardover about the voltage. I never let mine get to or under 11.1V. The only time my motor pulsed was when the voltage was too low. And that only happened because I didn't fly for a while and I thought all my batteries where charged up, but the one I flew with.

_____________________________

Since I started this hobby money seems to keep disappearing. :)
T-Rex 450SEV2, Gaui 200 SD

(in reply to droggy)
       Post #: 1430

RE: .........&quo... - 5/6/2008 5:13:29 AM   
evdreamer


 

Posts: 2430
Joined: 8/12/2007
From: Lincoln, NE, USA
Status: online
quote:

ORIGINAL: racinron122

thanks for your help. im finding if i just use common sense and stop looking into this hobby to much it makes sense. again, thank you. ron


Your welcome. I was glad to help out.

_____________________________

Since I started this hobby money seems to keep disappearing. :)
T-Rex 450SEV2, Gaui 200 SD

(in reply to racinron122)
       Post #: 1431

RE: .........&quo... - 5/6/2008 6:02:45 AM   
droggy


 

Posts: 236
Joined: 3/22/2008
From: surrey, BC, CANADA
Status: offline 		Thanks for your help on the battery. I read that you don't overcharge past 4.15v per cell and don't let it get under 3v per cell. I guess that's not true?? won't be flying for a while anyways, pretty heavy duty crash today, all out of spares for now. Have to wait 2 weeks

_____________________________

walkera 5#10 metal / falcon 40 / belt cp / blackhawk 450SE

(in reply to evdreamer)
       Post #: 1432

RE: .........&quo... - 5/6/2008 6:14:39 AM   
evdreamer


 

Posts: 2430
Joined: 8/12/2007
From: Lincoln, NE, USA
Status: online 		Your welcome. I charge my batteries up to 4.21V per cell. From what my balancer manual says 3V per cell is the minimum. I just don't go to that. I am more concerned about how many mAh I use. I usually discharge my batteries to around 75% percent so I have a little cusion so I don't go over 80%. And that keeps me above 11.1V.

_____________________________

Since I started this hobby money seems to keep disappearing. :)
T-Rex 450SEV2, Gaui 200 SD

(in reply to droggy)
       Post #: 1433

RE: .........&quo... - 5/6/2008 6:22:16 AM   
droggy


 

Posts: 236
Joined: 3/22/2008
From: surrey, BC, CANADA
Status: offline 		so you only discharge to around 3.7 per cell? Where do you order your parts from? I need a bunch of stuff, but evrywhere is out of something and I have to place several orders to several places. Thanks again. Gord

_____________________________

walkera 5#10 metal / falcon 40 / belt cp / blackhawk 450SE

(in reply to evdreamer)
       Post #: 1434

RE: .........&quo... - 5/6/2008 6:34:35 AM   
evdreamer


 

Posts: 2430
Joined: 8/12/2007
From: Lincoln, NE, USA
Status: online 		I just got done charging a battery, I should have double checked my beginning voltage to get the exact reading. I mainly shop at helihobby.com or helidirect.com

_____________________________

Since I started this hobby money seems to keep disappearing. :)
T-Rex 450SEV2, Gaui 200 SD

(in reply to droggy)
       Post #: 1435

RE: .........&quo... - 5/6/2008 6:54:49 AM   
droggy


 

Posts: 236
Joined: 3/22/2008
From: surrey, BC, CANADA
Status: offline 		Do you time your flights, if so, how long do you fly per battery. Thanks for the info on parts, looks like they have everything I need. Vey much appreciated

_____________________________

walkera 5#10 metal / falcon 40 / belt cp / blackhawk 450SE

(in reply to evdreamer)
       Post #: 1436

RE: .........&qu... - 5/6/2008 2:06:45 PM   
chris6414



Posts: 624
Joined: 12/23/2004
From: Warminster , PA, USA
Status: offline 		Remember guys there is science to how long one can fly. It has many variables such as motor/pinion combo, Pitch, battery c rating etc. Electric motors and batteries will last the longest under the least load. Some flyers don't like the minimum so we trade performance for flight duration. Most set-ups with a decent 2200 MAh Battery at 15C+ will yield about 7 minutes of sport flying. This is of course with some mild pitch range like 5-6 degrees at hover and 7-9 degrees at the top with a linear throttle curve. Also, LiPos will dip well below 3.7 volts underload. The stock ESC has a primitive cut-off that kicks in at 9 volts under load. When you set her down though the pack will be around 10.5+ static. Perfectly good discharge. I did some more aggressive idle up setting the other day and set my throttl at half stick to 75% and linear to the top and she really was screaming (stock motor and pinion) and I lost at least 2-3 minutes of flight time. I also have a relatively cheap pack with some age on it and I can tell you it ran much warmer near the end then my better performance packs. So be careful with the cheaper LiPos and aggressive settings as I think this is where you read about certain packs puffing on first use where everyone else(with mild flight settings) is having no issues with them.

(in reply to droggy)
       Post #: 1437

RE: .........&quo... - 5/6/2008 3:43:55 PM   
GTX SlotCar



Posts: 2070
Joined: 10/7/2005
From: Gorham, ME, USA
Status: offline
quote:

ORIGINAL: droggy

Thanks for your help on the battery. I read that you don't overcharge past 4.15v per cell and don't let it get under 3v per cell. I guess that's not true?? won't be flying for a while anyways, pretty heavy duty crash today, all out of spares for now. Have to wait 2 weeks


We're always learning more about how to get longer lifespans in LiPo cells. When you read something about them, it's helpful if the article is dated.
The real (absolute) danger values where damage is likely to occur are 2.65v and 4.25v. Don't drain below the 1st or charge above the 2nd. But, you are better off giving yourself a safety cushion on the lower end, just in case, so we tend to pad the 2.65v to 3v. Like Chris said, there is a difference between static and load voltage.
I've always charged to 4.21 or 4.22v. I like the long flight times. Unfortunately, our cell engineers (and those of several premium batteries) have recently found that if you don't charge them that high, you will get a longer lifespan (more charge cycles) on your packs. 4.15 to 4.19 seems to be the optimum range. I've also noticed that a lot of the new auto chargers only charge to that range now. It's disturbing for me because the choice of longer flight times or longer lifespans is something I don't care to make.

The useful lifespan of a LiPo cell is generally considered to be 80% of its new capacity. The mAh rating on your LiPo pack is when the pack is new. It starts dropping after the 1st use.


_____________________________

Gary
SuperSkids® www.super-skids.com

(in reply to droggy)