I switched to the 5030 prop after flying with the floats to get a baseline on water & land. Here's some non-scale flying, to demonstrate the low-end grunt of the 5030 prop.

First flight with the 5030 prop. To say that climb-rate is much improved would be an understatement. Thrust-to-weight is just over 1:1.

Eflite UMX Carbon Cub w/GWS 5030 prop - non-scale flying (13 min 44 sec)

Here's another clip. I condensed it down to mainly power-climbs, 'power-loops', torque-rolls, hanging on the prop - and a few touch & goes.

Eflite UMX Carbon Cub w/GWS 5030 prop - power-climbs, torque-rolls, hanging on the prop. (4 min 9 sec)

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