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Old Apr 04, 2015, 04:12 PM
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Question
Park 480 good match for SR22 Cirrus 50.5 inch?

Hi all,fairly new to electric prop stuff,I recently bought a new in box great planes SR22 50.5 WS and wondeing if anyone has tried or could recomend the E flight Park 480?It says in the manual to use a e flight 10 power but a 480 just came up cheap so hoping it may suit.Cheers,James.
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Old Apr 04, 2015, 06:42 PM
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Sorry but the 480 just won't cut the mustard here. Eflite tend to use minimum sized motors in their arf's, I'd suspect the 10 to be the minimum, a 15 likely better on a 50" plane. If the plane is over 3-4 lbs, I'd be tempted to use a 25 size system. jm2cw fwiw Doug B
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Old Apr 04, 2015, 06:43 PM
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If you go by the 3 watts/gram rule of thumb, the E-flite Park 480 should be able to draw more power than the Rimfire. If you go by the published spec's. for each the Rimfire is about 20% more powerful. I think the Rimfire spec's are a bit overstated.

There are two E-Flite Park 480's. One is 1020 Kv and the other is 910 Kv. Which one are you looking at. The 1020Kv unit can pull a little more amps than the 910 Kv.

I think the Park 480 will Fly your plane just fine. It may not have the performance that you would get if you loaded the Rimfire up with a big prop and went to the max figures as published, but it will fly very well.
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Old Apr 05, 2015, 05:44 PM
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Thankyou for the replies,the motor Im looking at is the 1020kv.I would like it to be slightly over powered than under,is there an ebay combo that would fit/work that I could use?
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Old Apr 05, 2015, 06:17 PM
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Start with what the model needs and how you want to fly it, and then choose an appropriate power system, not just a motor.

Assuming 3lbs as per Tower's claims (maybe a bit optimistic on the light side for a 50" ARF) and looking for good sport aerobatics, you'd want a 300-350W power system. That suggests straight away motors in the 100g class, not the 71g Rimfire .10. It also suggests the 87g Park 480 is on the small side.

To deliver up to 350W, 3S at up to 35A makes good sense, and capacity of at least 2500 mAh will give over 6 minutes per flight while being easy on the batteries.

Tower suggests a 10x7 prop, but is that because it is a good choice for the model, the biggest diameter that will fit, or just the biggest that will work with a Rimfire .10? Will a bigger prop fit?

If you're limited to 10" props, then you will need Kv around 1100-1200 rpm/V in motors around 100g - the lower end of the Kv range in heavier motors that are more efficient at 300W+. The Park 480-1020 will only use about 250W if you're limited to a 10" prop. If you can use an 11 or 12" prop, you'll find a few more motor options in the 100g range, and the overall power system will be more efficient.

The other factor to consider is motor weight. Does it tend to being tail heavy? If so, then motors around 130-150g have plenty of options in the Kv you need and wil run more efficiently and cooler than ~80g motors.

I'd be having a good look at how the model balances and what props fit before choosing a motor - and if the Park 480 is a really good deal - grab it for the next model as it's likely not a great choice for this one.
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Old Apr 05, 2015, 06:50 PM
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It's a sport scale model. If we were looking at an aerobatic plane, maybe 300-350 watts would be right, but I think for scale type performance the 480 would deliver what is needed. I guess it depends on what you want to do with the plane.
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Old Apr 05, 2015, 07:13 PM
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Quote:
Originally Posted by Mike Dubovsky View Post
It's a sport scale model. If we were looking at an aerobatic plane, maybe 300-350 watts would be right, but I think for scale type performance the 480 would deliver what is needed. I guess it depends on what you want to do with the plane.
Good points, especially the last sentence. I'd add "and what it actually weighs and how it balances".
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Old Apr 05, 2015, 07:21 PM
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Yes, if it needs nose weight, better to use motor or battery to get it rather than lead.
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