RunRyder RC
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 1403 views POST REPLY
Home✈️Aircraft🚁HelicopterThunder TigerOther › battery question
01-14-2006 06:01 PM  13 years ago
Topic Vote0Post 1
boatman63

rrNovice

toledo ohio

MyPosts All Forum Topic
battery question
i have a raptor50.ben flying with regular servos, a gy240 gyro,jr1100 batt.was geting 4 flights.then put jr ds811 servos in it and then got 3 flights with full charge.then put gy401 and s9254.now i only get 1 flight.do i need beter battery?what do you guys suggest?
thanks.
SHARE  PM  EMAIL  Attn:RR  Quote
01-14-2006 06:02 PM  13 years ago
nivlek

rrProfessor

Norfolk England

MyPosts All Forum Topic
Get a minimum of a 2AH sub C nicad pack .At the end of the day , it gets dark .
SHARE  PM  EMAIL  Attn:RR  Quote
01-14-2006 06:25 PM  13 years ago
Andreas

rrVeteran

Sweden

MyPosts All Forum Topic
I agree. Sanyo 2400 Nicd cells are nice.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-14-2006 06:37 PM  13 years ago
vavavoom

rrVeteran

London, England

MyPosts All Forum Topic
I fly a Raptor 50 with the 401/9254 combi and digital servos. I use a 1700mah Nicad and lasts for about five or six flights.
In my opinion I would stay away from Nimh packs, Sub C cells may also be too heavy.
## Inteligence is knowing a tomato is a fruit...Common sense is not putting it in a fruit salad
SHARE  PM  EMAIL  Attn:RR  Quote
01-14-2006 07:24 PM  13 years ago
boatman63

rrNovice

toledo ohio

MyPosts All Forum Topic
thanks. going to hobby store to see what i can find.
SHARE  PM  EMAIL  Attn:RR  Quote
01-14-2006 08:43 PM  13 years ago
robhurlin

rrKey Veteran

Pretoria, South Africa

MyPosts All Forum Topic
I have the JR 1900mAh NiCd pack on my 90 and it is GREAT. Usually cycles at 2100 mAh. I use only about 380mAh per flight cruising and throwing around. I have 3 Hitec 6975 digitals with 401 & 9254 on tail and GV1 & 9253 on throttle! I tried the NiMH 2800 pack but threw it out - I used about 800 mAh per flight & etc. NiCd or LiPo with big regulator is the only way to go!
PS: I have the same setup on my 50 as Vavavoom and have the same endurance.
Rob.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-14-2006 08:46 PM  13 years ago
AirWolfRC

rrProfessor

42½ N, 83½ W

MyPosts All Forum Topic
Go to http://www.AirWolfRC.com and click on the "Average Current Consumption" link.

Wolfgang
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-15-2006 09:15 AM  13 years ago
ausheli

rrApprentice

Kalgoorlie, the gold capital of Australia, Western

MyPosts All Forum Topic
In my opinion I would stay away from Nimh packs, Sub C cells may also be too heavy.
old school of thought man, read this

http://www.hangtimes.com/rcbattery_faq.html
Drill it, Blast it, Bog it
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2006 09:59 AM  13 years ago
LogoHeli

rrVeteran

Brisbane, Queensland, Australia

MyPosts All Forum Topic
Any pack with about 1900 to about 2500, will serve you well.

Otherwise you can convert to Li-Po + a regulator. Something like a Duralite 1900mah or 4000mah battery+ of course a regulator, charger, tester, etc. They come in packages, so it makes it easier to buy.

With the duralites, you can get a whole weekend of flying from one charge, so it works out pretty handy.
heli+ground/heli+tree/heli+bush=not good
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2006 05:34 PM  13 years ago
satwelsh

rrApprentice

South Wales UK

MyPosts All Forum Topic
I am running 2X4.8 volt 2500Mah in parallel which is good for maybe 10 flights or more and gives me added comfort that if one goes down i still have one running and no crashes
SHARE  PM  EMAIL  Attn:RR  Quote
01-15-2006 08:19 PM  13 years ago
robhurlin

rrKey Veteran

Pretoria, South Africa

MyPosts All Forum Topic
Satwelsh, are your two packs isolated from each other (using a matchbox, regulators, diodes etc), or hard wired in parallel? If they are hard wired together and one goes down your system will only keep going if the failed battery is open circuit. If the failed battery shorts or has a dead cell or goes flat it will pull the other battery down and you may not have enough power to keep flying. If they are isolated from each other I would be interested in knowing how.
I have read hangtimes FAQ as recommended by ausheli but I would still rather isolate the packs from each other just in case one goes wierd on me. We avoid NiMH because of the higher resistance and not for reliability. I will try the idea of 5 cells though - it sounds promising. I have also found NiMH to use much more of it's charge for the same heli setup - probably because of the higher internal resistance and it's poor ability to handle high current peaks. Our RC radio repair guy (40 years in electronics & RC) flies jets and will not touch NiMH - even the latest generation! He goes exclusively with NiCd for high current demand applications.
Rob.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2006 08:56 PM  13 years ago
SRH990

rrKey Veteran

Birmingham, UK

MyPosts All Forum Topic
I'm using a 2 cell 1500mAh lipo pack with a 5V regulator on my Raptor with virtually the same setup, this easily give 3 flights before charging. I tested the setup before moving to lipo and found it was pulling 2.8A with 3 servos stalled so well within the lipo range. The advantage I find with the lipo is that top-up charging is no worry, the pack will provide 16A at 7.4V and is regulated down to 5V so the voltage remains steady.Steve -Trex 700N, Trex 600N, Raptor 550E, 450SE, Mini Titan, Logo 5003D, Beam E4
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2006 09:51 PM  13 years ago
AirWolfRC

rrProfessor

42½ N, 83½ W

MyPosts All Forum Topic
I have also found NiMH to use much more of it's charge for the same heli setup - probably because of the higher internal resistance and it's poor ability to handle high current peaks.
There are some NiMH cells that have very low internal resistance. They can handle the higher currents. The average current chart on my home page shows a couple of them. But they don't have the long history of NiCd. Time will tell.

Wolfgang
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-16-2006 07:56 PM  13 years ago
robhurlin

rrKey Veteran

Pretoria, South Africa

MyPosts All Forum Topic
Thanks Wolfgang, I found your tables very interesting and helpful. I see the two NiMH cells you list with low internal resistance are both specified by SANYO as high discharge cells(http://www.sanyo.co.jp/energy/engli.../twicell_2.html). It is interesting to note that their internal resistance is similar to the Nicads you list. Did you calculate the internal resistance from your measurements or is it listed somewhere?
Our local supply of SANYOs has not been too good lately. If I can't source those cells locally I will try bringing them in.
What I really need for my fun fly plank is a low resistance NiMH weighing about 13g. I am using gp950 AAA cells at the moment but they also seem to suffer from high internal resistance. Any ideas?
Rob.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-16-2006 08:00 PM  13 years ago
AirWolfRC

rrProfessor

42½ N, 83½ W

MyPosts All Forum Topic
The only way to get lighter is to go LiPo. A 2s1p 2000 pack with a regulator would be the lightest possible, if weight is the primary goal.

Wolfgang
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-16-2006 08:17 PM  13 years ago
helibird

rrKey Veteran

St. George, UT

MyPosts All Forum Topic
I use a 3s 1320ma lipo pack with a UBEC, get 6 flights with a little room to spare. On my other bird I went with a 3s 900ma lipo and get a solid 4 flights. This is on a Rap50, 3x 9252, TJpro w/ 9254, GY601 w/9251. Doesn't get a lot higher consumption then that! (guess I could get the airtronics servos) .

Haven't weighed it yet but the 900 ma w/ the UBEC is really light.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-17-2006 04:33 AM  13 years ago
robhurlin

rrKey Veteran

Pretoria, South Africa

MyPosts All Forum Topic
I tried the E-flite Apache 700mAh 2s1p Lipo with a regulator from the LHS. Total weight was under 50g but I got occassional glitches. I could try it again and move the regulator far away from the Rx. It was right next to the Rx - would this cause glitches?
If this doesn't work I will have to order a light weight regulator like the MPI 0.6oz unit. The UBEC looks cool too! How much does it weigh?
Small nicads of 400mAh capacity used to be available so I could find out if they are still around and then charge after every 2nd flight (PITA!!).
Nothing powers the servos like AA nicads. The AAA NiMH and lipo/regulator both gave me a much slower response on the servos (all digital minis). The AA pack weighs around 100g & I need 50g or less (got to retain 1st place in veterans class!). The lighter stuff still works fine, it's just that the servos respond a little slower to the snap roll and spoiler switches.
Any other ideas would be gratefully received!
Rob.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-17-2006 08:22 AM  13 years ago
nivlek

rrProfessor

Norfolk England

MyPosts All Forum Topic
I could try it again and move the regulator far away from the Rx. It was right next to the Rx - would this cause glitches?
Yes , most definately .
At the end of the day , it gets dark .
SHARE  PM  EMAIL  Attn:RR  Quote
01-17-2006 10:24 AM  13 years ago
PaulJC

rrElite Veteran

Hertfordshire UK

MyPosts All Forum Topic
Small nicads of 400mAh capacity used to be available so I could find out if they are still around and then charge after every 2nd flight (PITA!!).
Realistically a 400mah Ni-Cd would only have enough juice for one flight, now that would be a PITA:d
I fly a Raptor 50 with the 401/9254 combi and digital servos. I use a 1700mah Nicad and lasts for about five or six flights.
I want that battery, my 2400mah Sub-C will only go 5 flights max.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-17-2006 12:42 PM  13 years ago
satwelsh

rrApprentice

South Wales UK

MyPosts All Forum Topic
Hi Robhurlin
If you do a search on here somewhere there is an article about running two batteries in parallel, which states that if using two batteries and two switches both batteries would have to die for there to be a complete failure. If one just goes completely dead it will not draw enough current from the other one to flatten that one. There is also a topic on nicads v nihmn
SHARE  PM  EMAIL  Attn:RR  Quote
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 1403 views POST REPLY
Home✈️Aircraft🚁HelicopterThunder TigerOther › battery question
 Print TOPIC  Make Suggestion 

 8  Topic Subscribe

Saturday, September 21 - 4:07 pm - Copyright © 2000-2019 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online