RunRyder RC
 11  Topic Subscribe
WATCH
 2 pages [ <<    <     1     ( 2 )    >    >> ] 2381 views POST REPLY
Scorpion Power Scorpion Power
Helicopter
e-
Electric Motors-Controllers-ESC
Other › kontroniks and buffer pack
04-11-2011 02:13 AM  6 years agoPost 21
Gernejr

rrKey Veteran

Miami, Fl

My Posts: All  Forum  Topic

What do you think a minimum buffer pack size could be , only looking for enough power to auto in if lost power?
I was using about 400mah on 8v setup when i use to run battery flight pack. Figuring from time of losing power to landing may be max time of 10 seconds. Would you think 100mah should be enough ?
I running DC-UP cricket and it will run system 1 maybe 2 second now(on bench),That's just capacitor.
I ordered 4.8 125 mah pack to test today.

Do you think running Knotronik HV80 ESC at 6v will hurt the 4.8v buffer pack or should it be good to keep the buffer pack charged?

Sponsored by Visa

PM  EMAIL  GALLERY  Attn:RR
04-11-2011 02:25 AM  6 years agoPost 22
jbdww

rrElite Veteran

Round Rock, Texas

My Posts: All  Forum  Topic

I would think you would need a buffer pack that will get you threw one flight as you will not know when the BEC fails, unless you can do something that turns the RPM down on the rotor disk.

Skids Up
http://www.jbdww.com
http://twitter.com/jbdww/

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
04-11-2011 02:44 AM  6 years agoPost 23
Gernejr

rrKey Veteran

Miami, Fl

My Posts: All  Forum  Topic

I guess i figure if the BEC quit in the Knotronik esc then the speed control would quit too , forcing you to auto in.
Have you heard of the BEC quiting and still letting the speed control able to work?

Sponsored by Visa

PM  EMAIL  GALLERY  Attn:RR
04-11-2011 03:04 AM  6 years agoPost 24
jbdww

rrElite Veteran

Round Rock, Texas

My Posts: All  Forum  Topic

I think the BEC and the ESC are two different circuits, so there could be a point that only the BEC would fail.

Skids Up
http://www.jbdww.com
http://twitter.com/jbdww/

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
04-11-2011 06:22 AM  6 years agoPost 25
Band1086

rrElite Veteran

Kennewick, Wa. USA

My Posts: All  Forum  Topic

The main rotor quit at about 3.5 mins on my TR 700 the other day, but the bec was still working, which saved it. Jive 80 no buffer pack.

PM  EMAIL  GALLERY  Attn:RR
04-19-2011 10:45 PM  6 years agoPost 26
Gernejr

rrKey Veteran

Miami, Fl

My Posts: All  Forum  Topic

This is for the guys who want enough battery to Auto in if there should be problem with flight power/BEC.

First I only tested this on 2 FBL setups all using HV80 esc and bec.

#1 Futaba BLS 253 cyclic and BLS 251 tail with Futaba GY750 FBL what a super efficient setup . With BEC set @ 5.6 and using 4.8 NiMH 125mah pack will run the setup for about 1 minute.. Battery pack weights 12 grams. Tested on Fusion 50 ,Trex 700,Avant 90. Tested on bench holding pressure on the blades from moving easily.

#2 JR 8717's on cyclic and Outrage BL 9188 with Skookum 720 . First the Sk720 does not like voltage under 5 volts. So I'm running BEC at 6 volts but with 4.8v 125 mah pack and Fromeco DC-UP cricket last about 15 second before servo response slowed down. I have ordered 6.0 NiMH 180mah pack (around 20g) which should be good for full minute. The Cricket by itself is only good for 1 to 2 seconds but keeps voltage very even in flight. I can check this though Sk720 replay. Tested on Trex 700 and Fusion 50..
Understand this is only to have enough power to auto in if you lose power to motor. I don't know about anyone else but when I've lost power it's amazing how fast i can Auto my heli in..

The battery were ordered from cheapbatterypacks.com . We did test on 4.8 125mah battery on first charge they charged up to 5.9v and 165mah. Then when load tested drop to 5.2v..

One thing I learned from this is how efficient the BLS servo really are..

(UPDATE)
I receive the 180mah 5 cell 6v pack wieght in @ 24.5 grams on my 700n with SK720 and 8717's and 9188 . Battery first charge was at 220mah 6.9v . Now after doing a full flight and unplugging the 12s packs I was able to run my electronic for full minute before showing any sign of slowing down. So if i lose BEC power should have not problem Autoing in.

Sponsored by Visa

PM  EMAIL  GALLERY  Attn:RR
WATCH
 2 pages [ <<    <     1     ( 2 )    >    >> ] 2381 views POST REPLY
Scorpion Power Scorpion Power
Helicopter
e-
Electric Motors-Controllers-ESC
Other › kontroniks and buffer pack
 Print TOPIC  Make Suggestion 

 11  Topic Subscribe

Monday, September 25 - 12:43 pm - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online