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CarbonXtreme . Midland Helicopters . HeliProz

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Audacity Models Pantera 50 - Tiger 50 > Servo draw
 
 
bclong211
Senior Heliman
Location: Columbia ,SC

Building Pantera # 2- What is the rule of thumb for figuring the total amp draw of the three cyclic and tail servo/gyro? The servos have a max no load rating of 500 mah for collective and the tail is a 9254. I have a 3 amp regulator I am trying to use if it is sufficient.

I meant to do that!!!
04-16-2008 03:43 AM
 
 
TONYVAL
Senior Heliman
Location: Keyport, NJ - USA

Bill
I dont think a 3 amp reg would be sufficient for a 50, regardless of what servos you are running

I ran the align 3a reg on my raptor 30 with std servos, a 401 with dig servo, and it was OK

you might look into the new castle 10a regulator. they are inexpensive, programmable, and come from the factory set to 4.8 v, which is nice

I think they are around $20

here ya go:

http://www3.towerhobbies.com/cgi-bi...?&I=LXSWL3&P=ML

I am running one on a 50 titan now, works just fine
04-16-2008 11:17 AM
 
 
MartyH
Veteran
Location: Lawrenceburg, Indiana

No, no way I'd try to use 3amps on a 50 size heli. I use the Arizona by Fromeco. I think its a 7 amp and then Align the claimed 6amp for their 600 size machine and even though it wont really handle 6amps, it has been enough for the 50 size helis. I'm not familiar with what Tony is doing but that might work too and the price sure looks good.

Marty,
8 Raptors, Hawk Pro
EVO 50&90, Knight 3D
2 Audacity Panteras & Tiger 50
04-16-2008 11:47 AM
HOMEPAGE  
 
 
bclong211
Senior Heliman
Location: Columbia ,SC

I have the arizona on Pantera #1 but was trying to save weight and use something I had on #2. I guess the CC 10 amp looks pretty good!

I meant to do that!!!
04-16-2008 10:46 PM
 
 
The Dude II
Senior Heliman
Location: Martinsville, IN - USA

Gents,
Take a look in the Radio/Gyro section of RR.

For Example:

If you stall a Futaba 9155 (192 oz @ .13 @ 6VDC - my own test/measure) you'll draw over 2.5 Amps on 1 servo.

1 Futaba 9252 stalled @ 6Vdc is ~ 1.5 amp.

Equivalent might be 8717 from JR in power consumption.

Now, I doubt that ANY 50 in ANY pilot's hands would draw even near 7.5 amps (continuous). The mechanics just don't allow it (disc size & loading).

If you're serious 3D...run a good size NiCad or Nimh pack...or certainly step-up your flying to the Fromeco or Duralite products.

6 - 7 amps continuous should be more than enough.

it really tied the room together
04-17-2008 12:29 AM
 
 
bclong211
Senior Heliman
Location: Columbia ,SC

The Dude

What lightweight regulator do you use to achieve this 7 amps? Battery is not an issue- I am using a 3200mah lipo to balance the tail weight out.

I meant to do that!!!
04-17-2008 01:08 AM
 
 
The Dude II
Senior Heliman
Location: Martinsville, IN - USA

I've been using the 2 of the Fromeco Arizona's with 2600mAh Li-Ion for 2007 and now into 08'.
Pantera #1 is setup with 3x 9252, GV-1 & GY-611 and new to this season FASST (8ch).

#2 same but 3x9155.

I've just purchased an EagleTree flight data recorder...currently getting plane data...but aim to "look at" heat sink temps in flight as well as battery & servo voltage once the helis are flight-ready again.

To quote the Fromeco website:

http://www.fromeco.org/Products/02F...02/Default.aspx

Translating Power

The Arizona Regulator is rated in Watts, because the current limit moves, based on load. These limits are affected by battery voltage "droop" as it is loaded, and the voltage setpoint of the adjustable output. Current limits are shown to the left (based on power)*, for a regulator with the adjustable voltage at 6V (red), 5.5V (pink), and 5.0V (purple). Note that the higher output voltage means the regulator does not have to work as hard, and therefore the current limits are higher.

*using 2s2p Li+ pack, 4800mA-h Relions, and based on no forced convection



Keep in mind...I use CF Boom, boom supports, vertical and no horizontal fin on the back-end to lighten the tail...so I can carry less overall weight up front.

it really tied the room together
04-17-2008 08:47 AM
 
 
bclong211
Senior Heliman
Location: Columbia ,SC

The arizona is just too heavy for this heli. I want something light.
Who has used the CC 10 amp?

I meant to do that!!!
04-17-2008 11:53 AM
 
 
jrvander
Senior Heliman
Location: Mystic, CT

I use the CC 10A BEC and a 3S 1800 mAh LiPo pack in my Pantera. Servos are S9252 with a gy401-9254 combo on the tail plus GV-1 and a recently installed CarbSmart(still can't figure that one out).
The BEC is set at 5.8v and I have a step-down diode for the tail servo.

The weather has just turned fly-able recently so I haven't done any testing with the Eagletree but after three 8-minute flights I have to put back about 600 mAh in the LiPo.

The Arizona regulator really isn't too heavy for any 50 sized heli and it'll work just fine if that's the way you want to go. I just happened to have a 3S LiPo sitting around and a CC10A, so I decided to give it a try for myself.

As far as balance, alot of people seem to have issues achieving balance with the longer tail boom but I haven't seen this problem. I do use the longer radio tray (can't remember the part number off hand) and it balanced perfectly with an 1800 LiPo pack strapped underneath and a 149DP receiver above. Besides the GV-1 which sits on top of the elevator servo that's all there is. Heavy packs aren't necessary to balance the model im my experience.


- Jon

Jerry wins!
04-17-2008 01:32 PM
 
 
TONYVAL
Senior Heliman
Location: Keyport, NJ - USA

I am using the cc10 on my raptor 50 with a 401, my only other digi servos on it are on the gyro and collective

It works well out of the box and is light. You can also use higher voltage lipos with it, I use an apogee 2s2p 2000 ma pack with it. Although I have heard of people frying them at voltages above 11.1 volts

I also use an arizona reg on my tiger with all digi servos, and like that as well

Not sure what you are doing, but will that extra ounce of weight make that much of a difference in the end?
04-17-2008 03:45 PM
 
 
MartyH
Veteran
Location: Lawrenceburg, Indiana

Bclong211, the Arizona is too heavy for a Pantera?! Have you used one? An Arizona can eliminate your switch assembly and in some cases you can get rid of a servo extension or two and it allows you to use a lighter or higher capacity battery. It is definiately NOT a heavy system.

Marty,
8 Raptors, Hawk Pro
EVO 50&90, Knight 3D
2 Audacity Panteras & Tiger 50
04-17-2008 06:51 PM
HOMEPAGE  
 
 
bclong211
Senior Heliman
Location: Columbia ,SC

Well my purpose for building #2 Pantera is to go very light and more agile. I have the arizona on #1 and agree it is a great regulator- Just doing something different on this one.

I meant to do that!!!
04-17-2008 09:44 PM
 
 
billm
Key Veteran
Location: Liberty Lake, WA

The Arizona reg is the way to go. You could always get a smaller battery pack. You also have to put into play the flight recorder and all the goodies. So If you drop your pack size to offset the recorder your golden for data capture. Once you have data in hand and you understand what you want to learn. Remove the logger.
Durring beta testing of the first ET logger (V1) five years ago it was a brick!

My name is Billm. Cough, and I'm a Heli Holic
04-18-2008 01:47 AM
 
 
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Audacity Models Pantera 50 - Tiger 50 > Servo draw
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