rrTV-PHOTO   New HD TV
HOME   rrTV-PHOTO   GALLERIES   MY GALLERY   HELP-FAQ
myHOME PM pmRR MEMBERS 720 ONLINE 26 EVENTS SEARCH REGISTER  START HERE
 
4 pages [ <<    <     1      2     ( 3 )     4     NEXT    >> ]8781 viewsPOST REPLY
ZoomsHobbies . HeliHobby . Ron’s HeliProz South

.
.
Main Discussion > Average Current Consumption
 
 
AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

I say go to a 6V pack and isolate the RX/gyro/gov. supply line with a 1A schotkey and about 10uf tantalum. Run the servos direct to the battery. Should take care of a lot of problems.

Wolfgang
08-05-2003 Over year old.
HOMEPAGE  
 
 
hyflyr
Senior Heliman
Location: Baton Rouge, LA

One more I guess

The easiest and safest way is too use the KISS principle. A good 4.8v pack and a good ESV. Then just recharge when necessary. For 99% of us 4.8v is fine and provides plenty of headroom. Just don't get carried away and think 4 or 5 flights will always be fine.
08-05-2003 Over year old.
 
 
KCT
Veteran
Location: Ontario, Canada

AirWolfRC

please add:
Rappi112 with 9252's servos, gv-1, 9253 on throttle, gy601, 3000mah nimh sub c pack, installed on a Milli II
4 flights done beating on the tail with 957mah left in the pack

please add: GV-1 for KCT

sluggo usally does 8min flights

Cheers

Kay


That's not flying, that's crashing with style...

TeamBob00, WildCat, Helitron
08-06-2003 Over year old.
HOMEPAGE  
 
 
AirWolfRCrrProfessor - Location: 42½ N, 83½ W -
Kay,

It looks like this data is for Sluggo so I will assume that. I will also use an estimate for energy per flight from a previous post from sluggo "275 to 350 mah".

This chart has been moved to the end of this thread again.

Wolfgang
08-06-2003 Over year old.
HOMEPAGE  
 
 
bluefronted
Veteran
Location: South Africa

My Vigor CS , with 3 X 9402 analogues , 1 x 9101 anal ,GY601 , GV1 ,

2 flights of 20 minutes per flight , it consumes about 450 to 550 ma.
I check this by recharging with a robbe power peak 2 , and see the amps pumped back.My helis are charged until the last half hour before flying , so theres min drainage.

I use 2800mA 4.8 V sub c packs by GP batteries

With the above pack , I have flown dozens of times about 6 to7 flights , almost in succession ,with a Voyager 50 , 3 X 9402 , 1 X 9101 , GY401 9252.The voltage when checked with a 9ZAP ( yes the 9ZAP has a built in voltmeter) and 500ma load was around 4.4 to 4.5
08-06-2003 Over year old.
 
 
Dragon2115
Key Veteran
Location: New England

Quote 
For 99% of us 4.8v is fine and provides plenty of headroom.


The first part I'll agree with, for most a standard 4.8 volt pack will be fine, not great, but adaquate. But make no mistake, a 4.8 volt battery in a system with servos spec'ed for 4.8 volts provides no head room at all after about 10 minutes.

Quote 
I check this by recharging with a robbe power peak 2 , and see the amps pumped back.

Unfortunately this will not give you an accurate answer of the capacity consumed due to charging inefficiencies. Typically you have to put back around 125% of what was actually used when recharging a NiCd battery. So if you used 400 mAh during the flight you will have to put back 500 mAh when you recharge.

Quote 
The voltage when checked with a 9ZAP ( yes the 9ZAP has a built in voltmeter) and 500ma load was around 4.4 to 4.5

That's cutting it awefully close. If the voltage under a 500 mA load was 4.4 - 4.5 volts then under a real flight load of 1.5 - 2.0 amps average current your voltage is down to around 4.0 volts or less. That's getting dangerously close to the cut off point of many of our components like the gyro or receiver.
08-06-2003 Over year old.
HOMEPAGE  
 
 
AirWolfRCrrProfessor - Location: 42½ N, 83½ W -
Here's another update to the chart.

updated & moved down the list.
08-06-2003 Over year old.
HOMEPAGE  
 
 
donlynn
Key Veteran
Location: New Zealand

Edited 20 12 03

Gidday

raptor tt36 v1 390 tanks

3 -9252
1 -3001
gy401/9253
1500 nicads 4.8v (4A) Futaba capable of 4 flights of ~13 min flights of 75 % hard work. I charge after every 1 or 2 flights

343 mah (did this 3 times in a row) mah per charge at 2.3 amp charge rate one flight per charge cycle(triton)

Regards Don
08-19-2003 Over year old.
 
 
AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

Here's another update to the chart.



If anyone has anymore data for the chart, please give the following information;

Heli Type
Servos
Gyro
Governor
4.8 or 6.0V pack
your measured mah per charge
how many flights
average flight time

Wolfgang
08-19-2003 Over year old.
HOMEPAGE  
 
 
rckrzy1
Elite Veteran
Location: Hurst Texas

This bugs me

my XCELL with 9252's and 401/9253 with a 4.8V NiMH 2100 scares me, after 2 flights my 4.8 voltwatch will hang around the top of yellow, bottom of green but bounce occationaly to the top of red. Is this a problem of the NiMh ? I am going to try a NiCd again I think. Before digitals I ran 5 cell packs with 6V reg, I guess the new deal is 5 cell with 5.2 Reg.



Wildcat Fuels
09-16-2003 Over year old.
 
 
Vinnie
Senior Heliman
Location: Miami Beach, Florida

Batteries

I don't know what all of the debate is about.

When I bought my Fury Extreme kit, I asked the sales guy to pick out everything else I would need.

He threw some 9252s, 9253s, a GY401, GV1 into a box.

I told him I also needed a couple of receiver batteries. He gave me two flat sub-C NiCad packs with 3000 mAh capacity. I've never run out of power during a flight.

I hear a lot of talk about thicker gauge wires, NiMh packs, etc... but why has no one simply used larger cells? Don't tell me weight - I'm running a .91 C-Spec. I suspect I could put my 12 volt lead acid battery in the thing and the helicopter wouldh hardly notice (well maybe a little).
10-19-2003 Over year old.
 
 
AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

The main concern here is how many flights you can get before you have to recharge your battery pack. I don't like having to charge a pack after only 4 flights or so. If I can get 6 or more flights out of a charge, that's much better and more like a full day of flying.

Wolfgang
10-19-2003 Over year old.
HOMEPAGE  
 
 
w.pasman
Elite Veteran
Location: Netherlands

KTC

great measuerments, much better than the ones I had on my webpages (they are probably somewhat outdated )

http://graphics.tudelft.nl/~wouter/...ocs/servos.html

Can I add your results there?

Furthermore your results are apparently with only one loaded servo (heli standing still)? as you find more than 1.5A when you hold the servo. So that makes up for 5*1.5 = 7.5 A if all servos were fully loaded! What happens with the scope images in that situation, I suspect it's a lot worse. And what about in-flight situations?
10-19-2003 Over year old.
HOMEPAGE  
 
 
KCT
Veteran
Location: Ontario, Canada

w.pasman

sure, I got no problem with that. If I remember correctly I measured 0.85 A on a JR8231 and 1.5A on a GY-601 gyro/servo combination near stall.
Well, the scope screenshots are taken with different conditions. I tried to load up all the servos at one time using some stiff foam. I guess that is as close as it get's. And that is on the ground with more or less static load.
What happens in the air is just speculation but I can imagine that the system will see very high current peaks for fractions of seconds depending on flying style of course

Some time ago I have seen a device at Conrad Electronik that would record how many mAh have been consumed and what the peak current occured. Unfortunately they don't carry it anymore.

Cheers

Kay


That's not flying, that's crashing with style...

TeamBob00, WildCat, Helitron
10-19-2003 Over year old.
HOMEPAGE  
 
 
donlynn
Key Veteran
Location: New Zealand

Gidday

If anyone has a spare digital storage oscilloscope I'm quite happy to strap her onto the rappy 30 and take her for a strop round the paddock .

Regards Don
10-20-2003 Over year old.
 
 
w.pasman
Elite Veteran
Location: Netherlands

AirWolfRC

I'm a light flyer, mainly F3C figures. I have the following

Raptor50V2
9250 with Robbe 3D gyro in tail, rest analog 9202 and 3001 on throttle
no governor
4.8V 4cell 1700 pack
130mAh/flt
10min/flt
13mah/min
0.8A.
Usually I get 6 flights from my pack, and at the 7th the gyro gets very wobbly. I have than 800mAh or more left in the pack.

BTW can I also put your table on my webpages? That makes a nice overview of all those servo issues.
10-20-2003 Over year old.
HOMEPAGE  
 
 
Twobeers
Key Veteran
Location: Toronto, Canada

I've got the same 2700mah packs in all my stuff except 2 of my aircraft. First thing I do when installing the deans connectors is chop off a foot of the servo type lead coming out of the battery. Yes you can get quite a lot of resistance in that little wire and the resistance only increases as the wire heats up. Heat up you ask. Don't believe me? Run the battery down, and hook it up to your charger thru the regular Futaba or JR connector and charge it at 1 1/2-2A and put your fingers on the wires and connectors about 10 minutes later. Bet you will suprised at the heat coming from the wire. Another thing you can do is at the switch. Pull the switch out, unsolder the charge lead and toss it or put it aside for something else. Remove the black wires from the switch and splice together. Bridge the right and left terminals of the switch together, red wires only (you have now virtually doubled the current capability of the switch.)

I lost my infamous tag line.
10-20-2003 Over year old.
 
 
AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

W.Pasman, It looks like your F3C type of flying is sure evident in your current consumption.

The rest of us do 3D and the current consumption shows it.

I have no problem if you want to post my chart on your site.

Wolfgang
10-20-2003 Over year old.
HOMEPAGE  
 
 
donlynn
Key Veteran
Location: New Zealand

Gidday

Twobeers, Have you seen the newer Futaba h/d rx switches ?
I measured mine, at a couple of amps draw the loss through the switch was only around 100 mv total. They are almost twice the physical size and heavier wires.

I agree with you that the Futaba plugs are the limiting factor in a high charge rate, mine start to warm at 2 -2.5 amp.

Regards Don

added 31 /12 / 03

brand new switch yet to be fitted, including the wires , voltage measured at the gold terminals of the futaba connectors.
10-21-2003 Over year old.
 
 
w.pasman
Elite Veteran
Location: Netherlands

Great, I copied the most important values on my webpage.

http://graphics.tudelft.nl/~wouter/...ocs/servos.html

Thanks!
10-21-2003 Over year old.
HOMEPAGE  
 
 
4 pages [ <<    <     1      2     ( 3 )     4     NEXT    >> ]8781 viewsPOST REPLY
Century Helicopter . MTA Hobbies . Model Rectifier Corp

.
.
Main Discussion > Average Current Consumption
 PRINT TOPIC Advertisers 

Subscribe to This Topic

Saturday, January 10 - 1:39 am - Copyright © 2000 - 2009 runryder.com | email | link to rr | runryder needs cookie