Slo-V Flyer

As the title suggests, I bought this Park 450 890Kv outrunner by Eflite this June. The paper manual, and box say the motor is rated for 12amps continous. However, everywhere I searched on Horizon's website states 14 amps continous. I'm wondering if this is an older model I picked up? 12 amps seems a bit too low for use with my Mini Super Sportster, but I've run it cautiously so far with 8-cell Nimh pack using 9x7.5E, 10x3.8SF and 11x3.8SF, and the motor only heats up to about to 100-120'F after a 5-8 minute flight.

I'm wondering if I continue to use the 8-cell Nimh, or say I use a 3-cell lipo OR 10-cell Nimh pack in the future, what sized props I should use for safe operation with my Mini Sportster for just strong aerobatic flying (no hovering or 3D needed). Or maybe if someone can give me a few numbers such as the amp draw using 8-cells and using 3S lipo so that I know I'm not over working anything. The ESC I use is the 20-amp Eflite (not the v2)

Fliprob17

Here is the tech. spec. from the E-Flite website - it should be 14 amp continuous with a max. burst of 18 amps. The safest way to tell what prop is right is to hook up an amp meter or watt meter and measure each prop. individually.

PARK 450 BL OUTRUNNER MTR,890KV Product Specifications
Type: Brushless Outrunner
Size: Replacement for 370 or 400
Bearings or Bushings: Ball Bearings
Recommended Prop Range: 9x6 to 11x3.8 Slow Flyer or 10x5 to 12x6 Electric
Voltage: 7.2 - 12
RPM/Volt (Kv): 890
Resistance (Ri): .20 ohms
Idle Current (Io): .70A @ 8V
Shaft Diameter: .16 in (4mm)
Overall Length: 1.30 in (33mm)
Weight: 72g (2.5 oz)
Diameter: 1.1 in (28mm)
Length: 1.3 in (33mm)
Continuous Current: 14A
Maximum Burst Current: 18A for 15 seconds
Cells: 2-3 Li-Po or 6-10 Ni-Cd/Ni-MH
Speed Control: 20A Brushless ESC

Slo-V Flyer

Thansk for the info but I already have access to that particular data you show. However, lacking funds for a wattmeter to figure out amps, I wanted to know if anyone knows whether there used to be a 450 motor with only 12amp continous rating. Again the continous rating on my box and paper manual is different than the website's info. I just don't wanna fry the motor using anything larger than 9x7.5 prop or 10x4.5 until I can confirm.

gymheart

I'm confused. I'm new to electric. I know that the motors have kv values but am told that has nothing to do with the power of the motor. I'm flying a slow stick with a home-made foam wing with ailerons. It' s a bit heavy because I'm using the power pack from the Park Typhune. it is running the e-flight 450 with the esc from the typhune. It doesn't seem to have enough power and the battery goes out in less than 4 or 5 minutes.....any suggestions.....and....what does the power rating on the esc mean other than it can deliver that much amps to the motor?

Slo-V Flyer

1. You are right, kV doesnt really tell you anything about power, BUT, between 2 motors of similar specs, the lower kV one will generally have more torque, while the higher kV one will sacrifice some torque for more rpms. e.g. Eflite Park 480 910kV, and Park 480 1020 (?) kV. Look for the watts rating, (or if not listed, Volts x Amps = Watts) to get an idea of what kind of power it might put out.

2. What type of battery are you using? 600 mah? 1000 mah? 2000 mah? Nimh? Li-po?

3. What size prop do you have on that Park 450 Motor? I think I have that exact motor and using AAA 8-cell Nimh 650 mah batteries I get about 3-4 minutes of runtime using a 10x3.8 prop.

4. The power rating on an ESC is usually listed as Continous Amps / Max Amps burst (e.g. for 15 secs). And that is all it tells you, besides how many cells it can use. Always try to get one that exceeds your requirements by 25-50% for best efficiency and safety.

Now if you don't mind let's go back to my question about this Park 450 motor I have.

gymheart

Thanks for the quick and helpful reply. My battery is the Typhoon's NI-MH 10.8 v. 1000 mAh......

I'd help you, but obviously I don't know squat!!

Jimmy

gymheart

OOps....forgot....the prop started as an 11x4.7 but I switched it out with a 10x6......

Slo-V Flyer

With the 8-cell 1100 mah nimh I use with a 9x7.5 prop, I get about 5-7 minutes of flight time. So I think with a bigger prop as yours and a 1000 mah batt, 4-5 minutes seems about right.

I don't know about the lacky performance you mentioned though. My Mini Super Sportster is almost 24oz. and flies fine for an 8-cell pack, while you're using 10-cells on a lighter plane (16-18 oz?) so Hmmmm..?? [sm=confused.gif]

Fliprob17

Sounds like it is time to e-mail customer service at E-Flite then. From what I have seen and found, it has always been a 14amp continuous motor.

Slo-V Flyer

Thanks, I'll try and email Eflite for some info about this and clear it up.

PlaneKrazee

My Feedback: (14)

Did you get a response of E-Flight?

Slo-V Flyer

Yes I did receive a response..after about 6 days. Good news is, it IS rated for 14 amps continuous. Nice. [8D]

Now if only I hadn't crashed my Mini Super Sportster on the 10th, and killed the motor, I'd still be flying it today.[]

Oh well such is life... (or just pure crap bad luck....twice..... with a NEW $85 LIPO ruined in the crash as well)