Fun, Learning, Friendship and Mutual Respect
START  HERE


Unregistered
Go Back   HeliFreak > R/C Helicopter Support > Gaui Helicopters > Hurricane 550


Hurricane 550 Discussion and support of the Gaui Hurricane 550


Reply
 
Thread Tools Display Modes
Old 07-11-2008, 01:13 PM   #1
Drew816
Registered Users
 
Posts: 694
 

Join Date: Feb 2008
Location: Columbus, Ohio, USA
Default My new favorite thingie, a Tx Lipo!

http://www.helifreak.com/showthread.php?t=80243

$20, these battery kicks A$$!!! 12.6 volts, charge it up on your normal Lipo charger and talk about voltage hold, phew! My old Nicad for my Futaba 9CHP was an 11.2 volt that with 20 minutes of flying drop to 9.8-10.2 volts; huh?!? So I've done 20 minutes of flying so far with the Lipo battery and it went from 12.6 to 12.5; OH YEAH!!!

I'll report long term on this but I'm pretty pumped; and considering a replacement NiCad is $40, why would you bother?!?
Drew816 is offline        Reply With Quote
Old 07-11-2008, 01:47 PM   #2
Mikej
Registered Users
 

Join Date: Feb 2007
Location: UK
Default

I have just bought a 2400mAH Nimh for 9.95 (about $20) - I did think about a lipo but I have got to the field twice recently to find that I had either left the DX7 truned on in it's bag or possibly had swtiched it on as I put it into the case. In both cases the battery was so flat that the Tx would not even switch on - I hate to think what might have happened had it been a lipo
Mikej is online now        Reply With Quote
Old 07-11-2008, 02:33 PM   #3
gpach
Registered Users
 
Posts: 256
 

Join Date: Oct 2007
Location: Calgary, Alberta
Default

Just got the 1800 for my DX7 and am getting the same results. No more draining of the battery sitting on the bench unused and about 40 mins and its back to 100%.

I did think about the TX being left on mike. Not a good thought. So far have never left mine on by mistake but it may be a good practice to unplug the battery when not in use.
gpach is offline        Reply With Quote
Old 07-11-2008, 03:02 PM   #4
ICCA
Registered Users
 
My HF Map location
Join Date: Jan 2008
Location: Yuma, Az / Westport,Wa
Default

Quote:
Originally Posted by Mikej View Post
I have just bought a 2400mAH Nimh for 9.95 (about $20) - I did think about a lipo but I have got to the field twice recently to find that I had either left the DX7 truned on in it's bag or possibly had swtiched it on as I put it into the case. In both cases the battery was so flat that the Tx would not even switch on - I hate to think what might have happened had it been a lipo
That has been my fear also. I would like to try a lipo, but will only do so if I can have some kind of a low voltage cut off. The Tx has a warning, but that does no good if I'm not there. Is this kind of device out there?

Dave
__________________
I Can Crash Anything :o

AZE-CP-L; Trex 450 SE-V2, 401/9650; H550 XES-CF, 401/9254,Z20A-980KV; EP200SE ( stock Gaui NOW) ; Beam E4 401/9257,Z10A-3700KV; Mini Titan 325SE; Futaba 9CHP on 2.4G. + ETNZ Sailboat!!
ICCA is offline        Reply With Quote
Old 07-11-2008, 08:18 PM   #5
kahn10
Registered Users
 
Posts: 2,188
 

Join Date: Jun 2007
Location: new zealand
Default

it wouldn't be to hard to make one but it would leave you with another big problem.the low battery alarm in your tx (unless adjustable) is set up for nicads/nimahs safe lipo cut outs way higher........so no beep beep no warning and NO TRANSMITTER

marco
kahn10 is offline        Reply With Quote
Old 07-11-2008, 08:39 PM   #6
ICCA
Registered Users
 
My HF Map location
Join Date: Jan 2008
Location: Yuma, Az / Westport,Wa
Default

Quote:
Originally Posted by kahn10 View Post
it wouldn't be to hard to make one but it would leave you with another big problem.the low battery alarm in your tx (unless adjustable) is set up for nicads/nimahs safe lipo cut outs way higher........so no beep beep no warning and NO TRANSMITTER

marco
This is true, but if I'm flying, I SHOULD be aware of the voltage. They don't drop that fast. When it's on a shelf, or in it's case, who cares if it shuts off.

Dave
__________________
I Can Crash Anything :o

AZE-CP-L; Trex 450 SE-V2, 401/9650; H550 XES-CF, 401/9254,Z20A-980KV; EP200SE ( stock Gaui NOW) ; Beam E4 401/9257,Z10A-3700KV; Mini Titan 325SE; Futaba 9CHP on 2.4G. + ETNZ Sailboat!!
ICCA is offline        Reply With Quote
Old 07-11-2008, 10:15 PM   #7
mjdee14
Registered Users
 
Posts: 2,695
 
My HF Map location
Join Date: Aug 2007
Location: Nashville , TN, USA
Default

Where are we getting these batteries for $20 ???? plz post a link..

Thx

I am also tired of the DX7 running down so fast.....seems like I charge it after every session....
__________________
Blade 500x , dx8

Two retired Gaui 550 hurricanes (Sold)
mjdee14 is offline        Reply With Quote
Old 07-11-2008, 10:28 PM   #8
gpach
Registered Users
 
Posts: 256
 

Join Date: Oct 2007
Location: Calgary, Alberta
Default

I didnt get mine for $20.00. Went with the Kong 1800 mah packs from RH. Was less than 1 weeks worth of smokes.
gpach is offline        Reply With Quote
Old 07-11-2008, 11:01 PM   #9
daijoubu
Registered Users
 
My HF Map location
Join Date: Jun 2007
Location: Canada
Default

Quote:
Originally Posted by ICCA View Post
This is true, but if I'm flying, I SHOULD be aware of the voltage. They don't drop that fast. When it's on a shelf, or in it's case, who cares if it shuts off.

Dave
Still doesn't explain the guy on our local field that crashed into the golf course because his transmitter batteries were dead. We SHOULD do lot's of things. I still like warnings for when we don't do them. Piezos are pretty cheap. LEDs and meters worked for a long time. Any cutoff circuit could have a warning added.
daijoubu is offline        Reply With Quote
Old 07-11-2008, 11:05 PM   #10
mjdee14
Registered Users
 
Posts: 2,695
 
My HF Map location
Join Date: Aug 2007
Location: Nashville , TN, USA
Default

OK....for you elrical types....."twigitts" as we called them in the Navy.....

isn't 2400 mah....2400 mah whether it's being supplied by mnh or lipo? or is the real difference that your using a higher voltage on the lipo and therfore takes MUCH longer to get down to the tx cutoff voltage...

Kind of think I answered my own question......

Just wonder if we would burn up the TX
__________________
Blade 500x , dx8

Two retired Gaui 550 hurricanes (Sold)
mjdee14 is offline        Reply With Quote
Old 07-11-2008, 11:21 PM   #11
daijoubu
Registered Users
 
My HF Map location
Join Date: Jun 2007
Location: Canada
Default

2400mah is 2400mah, but the cutoff voltage for Nickel batteries is 1v per cell. Your transmitter uses 8 cells. Cut off voltage is 8v. Mine will start beeping at 8.5v because the discharge curve gets pretty steep at that point. LiPO cutoff is about 3.3v per cell. A 3s pack has a 9.9v cutoff. At 9v you may damage the pack. KP claims they can run much lower... down to 2.2v per cell. That's a 6.6v pack voltage which should trigger our warning alarms.
daijoubu is offline        Reply With Quote
Old 07-11-2008, 11:59 PM   #12
kahn10
Registered Users
 
Posts: 2,188
 

Join Date: Jun 2007
Location: new zealand
Default

the other thing is transmitting has quite a high power usage.spent more than 15 years with an r.t. strapped to my hip and lots of that time looking after a giant pile of them(god i hate them)i think having a lipo tx pack is an awesome idea.but with the way lipo voltage drops off at the end its possible that having an inline cutoff could go horribly wrong(the opposite to horribly right).ie rather have the low power alarm go off and accidently over discharging your tx pack(horribly right) than stop transmitting and totally lose control of one very angry flying lawnmower(horribly wrong)
kahn10 is offline        Reply With Quote
Old 07-12-2008, 06:51 AM   #13
Graeme67
Registered Users
 
Posts: 273
 

Join Date: Feb 2008
Location: Sunshine Coast Australia
Default

Mate there is no way I would want a LV cutoff on my TX. I can see things going pearshaped with that scenario very quickly. The main advantage of a LIPO is the low weight - just what we want in a birds. I can't see the point in a TX. The standard 1500mah Nmh that the Dx7 comes with lasts me nearly 2 weeks of flying most days. When the LV alarm goes off I bring her straight in. It doesn't happen often as I charge her up once the voltage gets down to 9.5V.

Cheers
Graeme
__________________
Gaui Hurricane EP 550 Pro
Z20 980kv Gaui 50A ESC GY401+S9254, DS821 (cyclics) 2 x 3S1P 3200mah Kong Power (6s),
Dimension Eng SportBec, Eagle Tree V3
Spektrum DX7 (Mode 2), Phoenix sim
Graeme67 is offline        Reply With Quote
Old 07-12-2008, 09:03 AM   #14
mjdee14
Registered Users
 
Posts: 2,695
 
My HF Map location
Join Date: Aug 2007
Location: Nashville , TN, USA
Default

After reading everything and several posts on other sites and Horrizons tech page....I just decided to order a larger standard type battery.....2600 mah for 24.95 plus shipping....about $30....that should uffice...and not burn up the tx in the process...

I have never left my tx on yet ( = knock knock)

but I could see it happening and runing a good pack.

Now I can use the 2600 pack in the tx and keep the stock 1500 charged and in my field box....in case I have a really great day of flying and need it. I can fly thru 7 sets of packs on the hurris and have plenty of power left with the original pack....it's just if I start adding planks into the picture.
__________________
Blade 500x , dx8

Two retired Gaui 550 hurricanes (Sold)
mjdee14 is offline        Reply With Quote
Old 07-12-2008, 12:33 PM   #15
Drew816
Registered Users
 
Posts: 694
Thread Starter Thread Starter
 

Join Date: Feb 2008
Location: Columbus, Ohio, USA
Default

I'm not sure what the original batteries Mah was 'supposed' to be, but in all fairness it was a few years old. Regardless my battery would go from a complete charge to unusable in 35-45 minutes of total use. It had developed such a NiCad memory that it was pretty well worthless; however I'll keep it charged and in my kit so should I ever need a backup it's available.

So I got a 2500 mah replacement for $20, HALF the price of the original with more power and it's a Lipo. Advantages we already know, disadvantages, correct the Tx alarm is going to no longer be 'functional' but I charge my Tx like I recharge my flying Lipos so I don't ever expect to show up at the flying field with a dead or depleted Tx battery (if I do, see the above). I check my power on all my equipment before I fly and the T9CHP radio as Voltage right there so if I get into Lipo trouble territory I'll have to remember to swap. But I've never gotten to the Alarm point on my Tx anyway. Plus I jumped from 11.1 volts to 12.6 AND more Mah to back it up as well as it being lighter (hey, makes for a lighter Tx so that's a nice side benefit!) and cheaper.

We'll see, perhaps someday I'll report back I screwed the pooch, didn't check voltage and planted my bird; let's hope not, but I'll take a cheaper, lighter 2500 mah battery anyday over what I had! I wonder it there's a way to setup your radio to give an earlier warning? I'll have to check that out...

Happy Flying!
Drew816 is offline        Reply With Quote
Old 07-12-2008, 01:04 PM   #16
Mikej
Registered Users
 

Join Date: Feb 2007
Location: UK
Default

Drew,

It's not the low voltage cut-out bit that worries me but the behaviour of lipos when and over-depleted - from my understanding if a lipo gets drawn down too low then it can get volatile and can catch fire ?? When I left my Tx switched on and it went completely flat, after a minute or two of charging I turned the Tx on to check that it still worked and the voltage reader was 6.6V - wouldn't want to take a 3S lipo down to that.

Hope it never happens.

Cheers,
Mike.
Mikej is online now        Reply With Quote
Old 07-12-2008, 01:33 PM   #17
kahn10
Registered Users
 
Posts: 2,188
 

Join Date: Jun 2007
Location: new zealand
Default

not 100% sure mike but i think if you over discharge them all they are is ****ed.its to rapidly discharging them that makes them vesuvius.and i reckon your battery cover popping off as they swell would give ya that hey ....somethings going on feeling
kahn10 is offline        Reply With Quote
Old 07-12-2008, 04:35 PM   #18
Mikej
Registered Users
 

Join Date: Feb 2007
Location: UK
Default

Quote:
Originally Posted by mjdee14 View Post
After reading everything and several posts on other sites and Horrizons tech page....I just decided to order a larger standard type battery.....2600 mah for 24.95 plus shipping....about $30....that should uffice...and not burn up the tx in the process...
My $20 2600mAH arrived today, charged it up ready to go - I can't believe that I've finally found something that I can buy cheaper than you septics - I'm gonna buy another to or three of them to celebrate
Mikej is online now        Reply With Quote
Old 07-12-2008, 08:45 PM   #19
Drew816
Registered Users
 
Posts: 694
Thread Starter Thread Starter
 

Join Date: Feb 2008
Location: Columbus, Ohio, USA
Default

I concur, I don't think 'over discharging' them is going to cause an eminent EXPLOSIVO crisis; I guess in theory it 'could' but if it were all that common Lipos would have been pulled from the general market place a long time ago as how many knuckleheads have left stuff plugged in way too long with their equipment after all?!? I know I have on occasion.

I agree with Marco, you might killed you Tx Lipo if you let it get too low but other than that the threat of killing my $20+ investment... BUT unplugging it might not be a bad way to go for 1) safety's sake in case you're right MikeJ and 2) to insure it's not accidentally knocked into the ON position and then discharged to death.

Here's a Common Sense RC Tx pack by the way, no additional warnings or anything which may not mean anything but...

http://www.commonsenserc.com/product...products_id=32
Drew816 is offline        Reply With Quote
Old 07-12-2008, 10:08 PM   #20
mjdee14
Registered Users
 
Posts: 2,695
 
My HF Map location
Join Date: Aug 2007
Location: Nashville , TN, USA
Default

[quote=Mikej;cheaper than you septics - [/quote]

Septics ?? is that the Queens English? I'm getting the feeling it's not a term of endearment....
__________________
Blade 500x , dx8

Two retired Gaui 550 hurricanes (Sold)
mjdee14 is offline        Reply With Quote
Reply




Unregistered
Go Back   HeliFreak > R/C Helicopter Support > Gaui Helicopters > Hurricane 550


Hurricane 550 Discussion and support of the Gaui Hurricane 550

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


Copyright © 2004-2015 by RCGroups.com, LLC except where otherwise indicated. The HeliFreak.com logo is a trademark of RCGroups.com, LLC.