Wolferl
Second Officer
Flight distance : 23793 ft
Austria
Offline
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I'm a bit sceptic here...
The standard battery for the Spark has a capacity on 1480 mAh and 3 cells. That gives you about 12 minutes of realistic flight time. I tried to eCalc a real Spark and got 12.8 min real flight time, which is about right. Also the max RPM is in the correct range (about 12000 rpms).
Now, lets assume, we add another 1480 mAh LiPo battery (plus its weight!) to it, we only get a realistic 18.3 min. real flight time, NOT the 25 min. plus.
Additionally, the Thrust-to-weight ratio goes down to 1.3, so thats a very lame bird now.
See the 2 eCalc sheets attached for reference:
Real Spark:
Spark with double sized battery:
Cheers,
Wolferl
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