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newbie question...

Old 05-03-2011, 02:30 PM
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-=-johnnyB-=-
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Default newbie question...

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What happens if i run (the listed specs below) on a 4s 2200mAH instead of a recommended 3s lipo on a 60amp ESC???:


Delta-V 480 65mm EDF System, 4800Kv
Key Features

* Designed for high current 3S Li-Po batteries capable of up to 60A batteries
* Ideal high current 3S option for the E-flite® F-16 DF
* Includes 65mm Fan Unit with installed BL480 Ducted Fan outrunner motor
* High-performance, efficient design EDF
* Injection molded, fiberglass-filled nylon
* Factory-balanced 65mm 6-blade rotor design
* BL480 4800Kv DF Motor is ideal for up to 650 input watts

Overview

This system is the recommended high current 3S choice for E-flite’s F-16 400 DF. The included BL480 Ducted Fan Brushless Motor, 4800Kv (EFLM1555DF) is purpose-built for this Delta-V 480 65mm EDF and together will provide great power 3S performance.

Performance Data (Measured Using BL480 4800Kv Motor)
Static Thrust: 1.6 lb on 3S (11.1V)
RPM: 45,000 on 3S (11.1V)
Watts: 565 on 3S (11.1V)
Current: 56A on 3S (11.1V)


BL480 Ducted Fan Motor Specifications

Kv: 4800 (rpms per volt)
Io: 3.1A @ 10V (no load current)
Ri: .023 ohms (resistance)
Continuous Current: 45A*
Max Burst Current: 58A*
Cells: 3S Li-Po
Brushless ESC: 60A

Delta-V 480 65mm EDF Unit Specifications

Rotor Diameter: 65mm (2.5 in)
Shroud Outer Diameter: 68mm (2.7 in)
Shroud Length: 42mm (1.65 in)
Weight: 30g (1.05 oz)
Overall Weight: 112g (3.95 oz) (motor and EDF unit)

*Data measured using included BL480 DF Brushless Motor

Actually i am not using on an an eflite plane. I intend to use it on another F16. Will it fry my ESC if i use a 4S?
Old 05-03-2011, 03:26 PM
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rvnrcer
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Default RE: newbie question...

ESC should be OK, as long as it will handle 4S, but I think the motor will smoke. Also, is there enough room in plane for 4S pack? If you can program a throttle curve or adjust the end point down so you are not running maximum RPM you may be OK.

Hope this helps.Keith
Old 05-03-2011, 10:22 PM
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172amd
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Default RE: newbie question...

This system is the recommended high current 3S choice for E-flite’s F-16 400 DF. The included BL480 Ducted Fan Brushless Motor, 4800Kv (EFLM1555DF) is purpose-built for this Delta-V 480 65mm EDF and together will provide great power 3S performance.

Performance Data (Measured Using BL480 4800Kv Motor)
Static Thrust: 1.6 lb on 3S (11.1V)
RPM: 45,000 on 3S (11.1V)
Watts: 565 on 3S (11.1V)
Current: 56A on 3S (11.1V)

You have the performance numbers for 3s, 56 amps, 565 watts, 45000 rpm! On 4s the motor will TRY to spin that fan at 80640 rpm, your 2200mah pack voltage will sag under load. That load will be much greater than your 60amp esc's rating. Your 4s 2200mah pack will have a hard time maintaining more than 3 volt/cell under this load. Choose a motor with a lower Kv for 4s.
Old 05-05-2011, 11:19 AM
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heavy metal thunder
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Default RE: newbie question...

I think 172AMD says it right. With such a high KV rating the motor is going to try and turn faster and when it can't, the excess draw from your battery will be wasted to produce heat. Not good for the motor or ESC.
Old 05-05-2011, 05:23 PM
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-=-johnnyB-=-
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Default RE: newbie question...

very well said guys. thanks for the info. i really pick up a lot of stuff in the forum.
anyways, i tried this set up 4s 2200mAH on this 4800kv motor. the jet flew fine with noticeable increase in speed but not impressive as to how i expected it.
the drawback of my experiment, the battery went hotter than usual when i was flying with a 64mm 4100kv (as expected), i mean, really really hot. (also maybe due to the outside temp of 87deg. the flight time was reduced by a minute on 60-75% of throttle.
the esc was warm which was usual from my previous set up.
i am using this set up on a bananahobby F16 by the way (the cheap one). the original set up was 64mm 4100kv 4S and i think my parkzone cub flew faster.
also, the fan blades were ripped appart due to a tiny rock that was sucked in by the intake on the second flight.
Old 05-06-2011, 06:56 PM
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ACES&8s
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Default RE: newbie question...

I use a 28-47 9 turn 4900kv inrunner on a HET 6904, four-blader with a 3 cell. 4 cell scary!! lol

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