Are they compatible with my eachine e61?

no,they will not fit the e61. you need 0615 motors.

Anyone know if these can be waterproofed somehow for an underwater drone?

I have not seen it done with these motors, but if you were to try I would suggest using MG Chemicals - 419D-55ML 419D Premium Acrylic Conformal Coating. I do not think these motors have a waterproof seal on the output shaft so you would be taking a risk.

How many motors are there? One 'set' would be 4 motors. Are there 12 (3 sets) of motors?

Yes there are 3 sets of 4 motors. A really great deal. I purchased them for both my 65s and 65s lite. They work great.

How many hours will these motors run?

I don't have an official answer for these motors. I typically have to replace a motor every 4 or so hours of flight time. So, my guess is about 8 to 12 hours of flight time. This is pretty typical for brushed motors.

3 Sets 7x16mm Motor 19000KV Brushed Motors with Jst1.25 Connector for Micro FPV Tiny Whoop Beta65S Frame and Eachine E011 Frame

Product ID: 86983769

Details

Brand
BETAFPV
Speed
19000 RPM
Voltage
3.7 Volts
Material
Iron
Item Weight
2.95 Grams

⚡19000KV Power

📏7x16mm Size

⚖️2.95g Weight

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1883924₫

Duties & taxes included

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
BETAFPV
Speed
19000 RPM
Voltage
3.7 Volts

Description

🚀 Elevate Your Flight Experience!

COMPLETE SET - Includes 3 sets of motors (6CW + 6CCW) for a full upgrade!
PRECISION FIT - Designed specifically for BETAFPV Beta65S and Eachine E011 frames.
EASY CONNECTIVITY - Equipped with JST 1.25mm 2-Pin connectors for seamless integration.
UNLEASH THE BEAST - Transform your micro whoop into a high-speed monster with 19000KV power!
FEATHERLIGHT PERFORMANCE - Weighing in at just 2.95g, these motors won't weigh you down.

The BETAFPV3 Sets 7x16mm Motor 19000KV Brushed Motors are engineered for micro FPV enthusiasts, offering a powerful upgrade from 17500KV to 19000KV. Weighing only 2.95g each, these motors are designed for optimal performance with specific frames, ensuring a perfect fit and easy installation.

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