RE: Esky honey bee CP  
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RE: Esky honey bee CP - 4/5/2005 1:33:47 PM   
pwterry


 

Posts: 134
Joined: 11/26/2004
From: Richfield, NC, USA
Status: offline 		This web site has an in flight monitor, the HRpoly-x. I have one, but found I don't need it. My HB2 will not fly at under 10 volts on my 11.1v, 1200mah batteries.

(in reply to casipak)
       Post #: 126

RE: Esky honey bee CP - 4/5/2005 4:42:06 PM   
tnd2000


 

Posts: 346
Joined: 7/6/2004
From: Flushing, NY, USA
Status: offline 		It is normal for the charger to get warm. As long as your battery is cool then it shouldn't be a problem. I don't know how hot is hot so can't really tell if anything is wrong with your charger.
You do not have to worry about charging time. As long as you have a working peak charger, you'll be fine. Charging time varies depending on the state of discharge of the battery. A 2000maH doesn't always require 2 hours to charge on a 1000ma charger. It depends on how discharge the battery is. You should let the battery cool down before you charge it but its ok for it to get warm while it is charging. Again warm is different for everyone so use your own best judgement.

(in reply to pwterry)
       Post #: 127

RE: Esky honey bee CP - 4/5/2005 8:51:28 PM   
casipak


 

Posts: 392
Joined: 5/14/2004
From: Richmond, VA, USA
Status: offline 		I will do that. I was just told that if a battery is charged very fast, in my case 20 minutes, its life gets shorter.

(in reply to tnd2000)
       Post #: 128

RE: Esky honey bee CP - 4/5/2005 10:13:17 PM   
paedbo


 

Posts: 501
Joined: 2/11/2005
From: Bridgeport, CT, USA
Status: offline 		http://www.eflightdesigns.com/cgi-bin/products.cgi?CAT=19


go to the bottom the one i have is there 3 cell monitor with led, its blue color and very small it fits easily on top of my 4 in 1 box.

However i emailed them to asked if they could reverse the circuit so the light comes on when it reaches 9 volts, i thought it was silly that they have the light on the whole time until it reaches 9 volts just so it doesnt cause any extra "power" draw, but the light clearly flickers when you give hard throttle and you notice it, and then i back out of the throttle and the light stops flickering because its above 9 volts again then i just land it.

(in reply to casipak)
       Post #: 129

RE: Esky honey bee CP - 4/6/2005 1:05:48 AM   
bell1684


 

Posts: 72
Joined: 1/29/2004
From: Cranston, RI, USA
Status: offline 		How many guys here actually use a monitor like that? Im just curious..

Ive always been lucky in using my gut instincts to tell me when its time to bring the bird in and charge the battery..till now (knock on wood) ive never had a problem. Ive always tried to be conservative with the flight times, especially depending on the style of flying im doing that day, the conditions, etc.

I think the concept behind the monitor is solid..im just looking for other guys opionions, especially those who have/are using them.


_____________________________

I like flyin' micro electrics cause the nitro guys are too scared to!!

(in reply to paedbo)
       Post #: 130

RE: Esky honey bee CP - 4/6/2005 10:27:40 AM   
batfalcon



Posts: 236
Joined: 2/8/2005
From: Nea Smirni, GREECE
Status: offline 		bell1684,

Having an experience of more than 20 years in RC cars I was relaing on my instict too, but I found out after 10 - 15 flight discharges that the capacity of the 1200 mAh has already dropped to 850 mAh. That is a full charge after discharging using "Triton". I suppose that without noticing I have over discharged the pack during flight.

So I digged in my lab and found out a tiny device made in USA by a firm called "SCI" if I recall it correctly.

casipak & jlb305

Those devices were used on cars to monitor the BEC system. They have 3 leds. One red, one green and one yellow. I will give you as much tech details as possible, cause I can't find any web site to guide you there. The dimentions are approx. 1*1.5 cm. It's inside a clear heat shrink and a cable like the one that servos have. You can plug it in at any free chanell on your receiver. It is set up to read the voltage in the receiver and warn you if the voltage is: Above 6.5 V, between 5 and 6 V, or lower than 5 V. In my (our) project as soon as the red led goes off, indicating voltage lower than 6.5 V, I know that I must land. I must say here that I did not pluged it on a free chanell but in parallel with the power cables. I tried the recommended connections but it did not served my purpose.




_____________________________

Michael

(in reply to bell1684)
       Post #: 131

RE: Esky honey bee CP - 4/6/2005 12:31:14 PM   
casipak


 

Posts: 392
Joined: 5/14/2004
From: Richmond, VA, USA
Status: offline 		I usually land with around 9.7 volts and I was told that real damage to the battery occurs at around 3 volts. The heli won't run on 3 volts so you have to fly till the battery discharged completely every time to do some light damage?

(in reply to batfalcon)
       Post #: 132

RE: Esky honey bee CP - 4/6/2005 12:54:11 PM   
batfalcon



Posts: 236
Joined: 2/8/2005
From: Nea Smirni, GREECE
Status: offline
quote:

ORIGINAL: casipak

I usually land with around 9.7 volts and I was told that real damage to the battery occurs at around 3 volts. The heli won't run on 3 volts so you have to fly till the battery discharged completely every time to do some light damage?


Pack WILL BE DAMAGED if the voltave drops below 3 V PER CELL. So for the 2 cell (7.4 V) pack, 6V is the bottom limit.


_____________________________

Michael

(in reply to casipak)
       Post #: 133

RE: Esky honey bee CP - 4/6/2005 1:25:29 PM   
jlb0305


 

Posts: 145
Joined: 3/23/2005
From: Baltimore, MD, USA
Status: offline 		and for a 3 cell its 9V min... plus thats operating voltage not the voltage under no load.

has anyone used the lithium poly safety guard? it says it prevents over charge and over discharge... but for discharge it just shuts off and doesnt give a visual or sound warning beyond this.

I think that $10 battery monitor sounds good... best of all i found it for $3 S&H in NJ... so only about 1-2 days shipping for me!!!

(in reply to batfalcon)
       Post #: 134

RE: Esky honey bee CP - 4/6/2005 10:24:51 PM   
casipak


 

Posts: 392
Joined: 5/14/2004
From: Richmond, VA, USA
Status: offline 		Thanks for the help with the battery. I guess I'll get that monitor thing.
I was landing near my esky box and I came too close so the main blade broke. The metal rod came out and some wood chipped off. I think it's fixable but if I never fix it, I wanna buy blades from heli-hobby. Are they in U.S.? Should I get PE blades or balsa or plastic?

P.S.- I heard that with PE blades, a more stable hover can be achieved and basically, the whole heli stables up but 3d can't be done with them

< Message edited by casipak -- 4/7/2005 12:20:35 AM >

(in reply to jlb0305)
       Post #: 135

RE: Esky honey bee CP - 4/7/2005 4:10:55 AM   
casipak


 

Posts: 392
Joined: 5/14/2004
From: Richmond, VA, USA
Status: offline 		I found this self build kit charger for 18 bucks with a power supply included.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=34056&item=5967917580&rd=1

(in reply to casipak)
       Post #: 136

RE: Esky honey bee CP - 4/7/2005 6:17:06 AM   
batfalcon



Posts: 236
Joined: 2/8/2005
From: Nea Smirni, GREECE
Status: offline 		I have ordered 2 sets of PE blades from www.heli-fever.com last Friday (04/01/05), but haven't received them yet in Greece . From what I heard, normal flight is more stable than the symetrical wooden blades, since the PE ones are semisymetrical, and of course inverted flight is out of the question. But who cares about that? It's going to take me some years to be ready for inverted . Till that I can practice without braking the bank .

About that little BEC Guardian I was telling you about. I suppose I can post the firm here:
"SCI International Servo Input-Plug System" Toll free 1-800-673-9563, SCI Power Corporation P.O. Box 13099, FL 34278 USA.
Don't know either how much it costs now, or the web address if any. So if any one finds out any of these, please post them.


_____________________________

Michael

(in reply to casipak)
       Post #: 137

RE: Esky honey bee CP - 4/7/2005 12:17:46 PM   
jlb0305


 

Posts: 145
Joined: 3/23/2005
From: Baltimore, MD, USA
Status: offline 		When I just did a search it came up as a charity organization and I knew that wasn't what I was looking for...

< Message edited by jlb0305 -- 4/7/2005 12:18:19 PM >

(in reply to batfalcon)
       Post #: 138

RE: Esky honey bee CP - 4/7/2005 12:21:37 PM   
casipak