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Help configuring Airtronics RDS8000 for electric flight

Old 03-08-2009, 12:18 AM
  #1  
ezra
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Default Help configuring Airtronics RDS8000 for electric flight

I am a total newbie. New to RC and new to electric flight so please excuse me if this is obvious.

I just got a Airtronics RDS8000 for use on a new Piper Cub trainer, I have been building for myself to learn the hobby. I am having a hard time figuring out how to hook-up the Airtronics 8CH 2.4GHz FHSS Receiver for use with electric flight. I have read the manual twice but the instructions provided are completely for gas engines; it never mentions electric motors or ESCs.

I attached a screen-shot of the page which explains the channels and what they should be used for.

Can someone tell me how should I hook up my ESC, motor, and battery?
What channels should I use?
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Old 03-08-2009, 01:02 AM
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Sky Sharkster
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Default Radio, Motor Hook-Up?

Hello Ezra, Welcome to Wattflyer!
Here's a link that should help;
http://www.ampaviators.com/index.php...d=50&Itemid=27
And it looks like the elevator goes to channel 1, the aileron to channel 2, the throttle to channel 3 and rudder to channel 4.
If you're right-handed, you will want the elevator on the right transmitter stick, the vertical movement. The side-to-side movement of the right Tx stick is the main lateral control. In the example I gave you, this would be the ailerons, but some flyers prefer the rudder here.
On the left-hand transmitter stick the vertical movement will have a ratchet, this is for the throttle. Stays where you put it, doesn't return to neutral. The side-to-side left-hand Tx stick is either aileron or rudder.
None of this will work without a battery, of course. On electrics, most of the time the supply to the receiver and servos is supplied by the motor battery (there are exceptions).
So, you'll need to hook up the motor battery to the ESC and the ESC (speed controller) to the "throttle" position of the receiver.
The battery and ESC muct have matching connectors, here's a photo of a couple of popular brands, the larger ones are Deans Ultra and the smaller ones are called "BEC". This is a two-wire connection.
The motor-to-ESC connectors are usually "Bullet" type, available in several sizes (diameter). For brushless motors, this is a three-wire connection.
If you are testing the system with the motor attached, REMOVE The Prop!! This is a very painful lesson otherwise.
Any questions, fire away, lots of helpful folks here.
Good Luck!
Ron
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Old 03-08-2009, 01:39 AM
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ezra
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Default Thanks for your help, one question?

Thanks for your help...

I mostly was confused because the receiver has the label for channel 8 as "8/B" implying that the battery is supposed to be attached to channel 8.

Based on your post and the link I should hook the ESC into the throttle channel and the battery and motor will be hooked into the ESC. Is this correct?

Will the Receiver be able to draw power from the throttle channel even though it is not Channel 8, and channel 8 is labeled "8/B"?

Thank you so much for your help.
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Old 03-08-2009, 05:43 AM
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BradT
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Yes, Ezra, the rx will draw its power through the throttle channel, via the esc, provided the esc has a "BEC" (Battery Elimination Circuit). The blurb in the esc packaging will tell you that info. Any of the channels could be used for rx battery input, it doesn't have to be the one labelled B, assuming you were using a seperate rx battery, which you don't need with most e-power systems.
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Old 03-08-2009, 08:50 AM
  #5  
CHELLIE
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Hi Ezra And Welcome to Wattflyers, What Motor, ESC and Battery will you be using, and how many servos, will it be a 3 channel or 4 channel with ailerons, The reason I ask, is to make sure your BEC in your ESC will handle the electrical load, BEC = Battery Eliminator Circuit, ESC = Electronic Speed Control, if you are only using rudder, elevator & throttle, a 2 amp bec should be fine, if you are using ailerons 4th Channel, then it would be best to use a 3 AMP Bec in your ESC, the AMP rating is normally less than what is written on the ESC, so its best to use the highest bec rating as possible, and some times, it even better to use a UBEC, the newby is not normally aware of this, so I thought i would give you a little insite, as to prevent any Problems, Take care, Chellie

http://www.wattflyer.com/forums/showthread.php?t=31071

http://www.wattflyer.com/forums/showthread.php?t=39138
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Old 03-08-2009, 06:36 PM
  #6  
ezra
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Default ESC and BEC

Thanks for the info of ESC and BEC. I didn't know anything about the BEC until reading your post so it was alot of help. I actually haven't yet bought a ESC, battery or prop.

My current configuration is like this:

Airplane:
Nitro Planes Red J-3 Piper Cub
Wing Span: 49.6in/1260mm
Wing Area: 286sq in/18.6 sqdm
Take-off weight: 2.30 lb/1050 g
Length: 31.7 in/805 mm
Engine: 2 Stroke 15-25 class or 480 electric motor (not included).
Radio system required: 4 channel with 4 servos (not included)

Receiver:
Airtronics 8CH 2.4GHz FHSS
Receiver Type: 92824z 8 Channel, FHSS, "Z" connectors
Dimensions: L: 1.85", W: 1.08", H: 0.61"
Weight: 0.53 oz
Receiver Power Supply: Four Cell, 4.8 volt

Servos (4 - Elevator, Rudder, L Aileron, R Aileron):
HiTEC Micro Feather HS-65HB
Motor Type: 3 Pole
Bearing Type: Top Ball Bearing
Speed: 0.14 / 0.11 sec @ 60 deg.
Torque: 24.99 / 30.55 oz.in (4.8v/6v)
Size: 0.92" x 0.45" x 0.94"
Weight: 0.39oz

Motor:
E-flite Park 480 Brushless Outrunner Motor, 1020Kv
Type: Brushless outrunner
Size: Park flyer
Bearings or Bushings: Ball bearings
Wire Gauge: 16
Recommended Prop Range: 10x7 to 12x6
Voltage: 7.2 to 12
RPM/Volt (Kv): 1020
Resistance (Ri): .06 ohms
Idle Current (Io): 1.10A @ 8V
Continuous Current: 22A
Maximum Burst Current: 28A (15 sec)
Cells: 6–10 Ni-Cd/Ni-MH or 2–3S Li-Po
Speed Control: 25A to 40A brushless
Weight: 87 g (3.1 oz)
Overall Diameter: 35mm (1.40 in)
Shaft Diameter: 4mm (.16 in)
Overall Length: 33mm (1.30 in)

So what should be my requirments around the ESC and the BEC in the ESC?

Last edited by ezra; 03-08-2009 at 06:44 PM. Reason: Corrected mistake in specs
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Old 03-09-2009, 12:02 AM
  #7  
CHELLIE
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Good, We Caught you Just In Time

use this motor its the turnigy 3542c 1100kv $21.00

http://www.hobbycity.com/hobbycity/s...nner_(Eq:_2820)

and use this ESC its a 40 amp with a 3 amp bec $34.95

http://www.hobbycity.com/hobbycity/s...idProduct=2165

and use this lipo. 3700mah 20C 11.1v 20C $46.99

http://www.hobbycity.com/hobbycity/s...0C_Lipoly_Pack

There, we just got you a powerful Power system for $ 102.94 thats very reliable and powerful, dont worry about it having to much power, as you can always throttle back, and using it at half throttle, will extend your flight time, you should get about 8 mins of flight time from this power system,

Now for the servos

Use the HXT 9 Gram Servos, they are very very strong, and your 3 amp Bec will power them very well, use 2 servos for the ailerons, if your going to use ailerons, mount the servos near the rudder and elevator, then run, servo extention wires to the receiver, a DX6i spectrum radio will work great, or a 6 channel computer JR Radio, with a BERG receiver, dont use JR receivers with e Power, they dont like e power and will glitch like mad,

http://www.hobbycity.com/hobbycity/s...ec_Micro_Servo

$ 3.65 they are sold out right now on these servos, but they get them in quick all the time, i normally buy 8 at a time, so i dont have to wait if they run out of stock


18"" servo extensions $ 1.10 get about 6 of these

http://www.hobbycity.com/hobbycity/s...on_(JR)__26AWG


y connector for aileron servos $1.68 get one of these

http://www.hobbycity.com/hobbycity/s...ad_30CM_Length
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Old 03-09-2009, 12:09 AM
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CHELLIE
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your E Flite motor will work OK, get the turnigy 40 amp ESC with the 3 amp Bec, the Hitec 65 servos are good, and your 2.4 radio is good,

use a Zinger wood nitro prop, 12x5 with motors this big, nitro props work great, a 12x5 wood prop works better than a 12x6 APC plastic prop, IMHO

the 3700mah 3 cell will work great for you, a 2500mah wont give you very much flight time.
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Old 03-09-2009, 04:03 PM
  #9  
ezra
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Default Thanks for the help, confirmation and question

Thanks for all your help Chellie!

I am mostly going to take your advice. This is what I am planning to order, let me know if this will work with my current setup.

Turnigy 12x5 Cherry Wood Prop
http://www.hobbycity.com/hobbycity/s...12x5_propeller

Turnigy Sentry 40amp Speed Controller
http://www.hobbycity.com/hobbycity/s...eed_Controller

Rhino 3700mAh 3S 11.1v 20c Lipoly pack
http://www.hobbycity.com/hobbycity/s...0C_Lipoly_Pack

One more question:
What is a good charger/Balancer that I could get for cheap to use with this setup. I need something that can charge from a wall socket or from a 12v battery. Do they make charges that can do both?

Thanks
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Old 03-10-2009, 04:43 AM
  #10  
CHELLIE
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Originally Posted by ezra View Post
Thanks for all your help Chellie!

I am mostly going to take your advice. This is what I am planning to order, let me know if this will work with my current setup.

Turnigy 12x5 Cherry Wood Prop
http://www.hobbycity.com/hobbycity/s...12x5_propeller

Turnigy Sentry 40amp Speed Controller
http://www.hobbycity.com/hobbycity/s...eed_Controller

Rhino 3700mAh 3S 11.1v 20c Lipoly pack
http://www.hobbycity.com/hobbycity/s...0C_Lipoly_Pack

One more question:
What is a good charger/Balancer that I could get for cheap to use with this setup. I need something that can charge from a wall socket or from a 12v battery. Do they make charges that can do both?

Thanks
The Plush or the Sentry ESC are great, I use the Plush myself, get the programing card too, about 6.95, you dont have to get it right away, but it helps if you ever accidently reprogram your ESC, by having the throttle in the wrong position when hooking up your lipo to ESC, also get a 11x6 prop so you can try different size props for your plane, you might like the 11 or the 12 better, you just have to try a few props and see, That 12x5 Cherry prop looks very very nice

http://www.hobbycity.com/hobbycity/s...11x6_propeller



Here is a nice turnigy Charger for not to much money, $23.95 and its a Balance charger, judging by the reviews, everyone likes it, it will charge 2 to 4 cell lipos, if you want the best charger, the cellpro 4 is the best of the best, its a little pricy, but its the safest charger on the market.

http://www.hobbycity.com/hobbycity/s.../Charger_2S~4S

The Turnigy 420 is a simple and easy to use balance charger which can handle 2 to 4 cells and charge at a rate of 2A.
With an input voltage of around 12v you will be able to use wall adapters or a car battery to power this unit.

this power supply should work great for you, you will need about a 5 amp wall charger, smaller wall chargers wont work for you, $9.99

http://www.hobbycity.com/hobbycity/s...A_Power_Supply
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