Thread: Build Log Polaris Seaplane Parkflyer
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Old Feb 03, 2012, 08:05 AM
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Canada, ON, Ottawa
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Originally Posted by Lockey View Post
Thanks Glen, its 1m wingspan, hopefully will run on the same gear (motor etc) as the Polaris

It sounds great. I'll be watching with great interest.

Here's the data on the Electrifly RTF model, which flies well. It's the same size as yours, so gives a target for the weight.

Wingspan: 39.5 in (1005 mm)
Wing Area: 234 inē (15.1 dmē)
Weight: 24-26 oz (680-735 g)
Wing Loading: 14.8-16.0 oz/ftē (45-49 g/dmē)
Length: 33.5 in (845 mm)

Here's the data on the motor used in the Electrifly Seawind. At 54g it's just slightly bigger than the usual Polaris 2212-6. Notice that it has much lower KV (950) than the Polaris motor (2200). This suggests that the model uses a larger, slower turning prop, such as the 8x6 mentioned below (compared to 6x4 for Polaris). I would expect the 2212-6 to do the job, but a 2212-10 (KV 1450) might be more efficient, turning say an 8x4. That would allow you to use a smaller, lighter battery of about 1500-1800 mAh.

Rimfire 400 28-30-950
Motor Diameter: 1.1" (28mm)
kV Rating: 950 rpm/V
Weight: 1.91oz (54g)
Input Voltage: 7.4-11.1V (2-3S LiPo)
Max. Constant Current: 14A
Max Surge Current: 20A
Max Constant Watts: 155W
Burst Watts: 220
Suggested Prop Sizes: 8x6
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Last edited by Daedalus66; Feb 03, 2012 at 08:14 AM.
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