Hello my Whoop Friends. UPDATE: Something was wrong with the 75 1002 23k build from my last Pusher video with the Flightcontroller/ESC or the motors. The 1002 23k motors should have more power. I have now converted my tried and tested 75 1102 22k into a pusher and have seen that it has more power. But the conclusion remains the same. The pusher configuration has advantages and disadvantages (they remain about the same). But I found out something new: The efficiency penalty of a pusher configuration seems to be less the lighter the build is. So the difference in efficiency compared to the puller configuration is smaller the lighter the build is (and perhaps also the lower the airflow through the props/ducts).

WARNING: You can burn your ESC`s with Pusher builds! Starting the whoop is sometimes not possible for example outdoors on gravel or in the grass and there is a greater risk of burn an ESC when starting the drone on uneven ground. The Propeller should never stick out of the ducts like on my build with the high pitch props. I modified the hub of the low pitch props with my dremel, that's why they don't stick out of the ducts!

So should you build a pusher whoop? Yes, I still think it is at least not a bad idea to try it out (if you have the resources for it). It's fun to experiment and educational.. Trying out the "side grip" feeling and the "pusher throttle feeling" was a good experience for me and important for my general whoop engineering experience. With every new experimental build you learn to think outside the box and get better at it. I hope I can help some of you with this video to think outside the box and try new things.

I think there will be something more to come from me in this area.. Stay tuned..

3:00 Pictures of the whoop

Footage of my 75 1002 22k in normal puller configuration:
   • RACING PRACTICE with 75 1002 22k and ...  

Advantages and disadvantages of a pusher configuration in short (Updated 11.1.24):

Advantages:
- Nice "side grip" flight feeling
- Good throttle control (at least a different throttle feeling and lower hover point)
- The Throttle is tamed (maybe helpful on a 2S whoop)
- Less or no Prop/Duct in view

Disadvantages:
- Lower efficiency (lower flight times) up to 25% less efficient and sometimes higher! (depends on frame/strut/duct design and weight of the build, lower weight is better)
- Less thrust
- Less topspeed
- More noise
- Difficult to implement in normal whoop frames
- Needs some pid tuning (?)
- Needs a frame with few and thin struts (happymodel V4 frame)
- Often higher weight of the build compared to puller configuration (doesn't have to be but can)
- Starting the whoop is sometimes not possible for example outdoors on gravel or in the grass
- Greater risk of ESC burnout (when starting the drone)
- Poorer cooling. Higher temperature of the flight controller (approx. 75 degrees Celsius). In my case with 25mw vtx transmission power there were no problems. But higher transmission powers could lead to maybe to much heat

Possible uses for the pusher configuration:
- Lightweight 1S whoop build for very narrow and technical indoor tracks with very small gates
- Lightweight 2S whoop (pusher configuration to tame the throttle a bit)

Happy whoopin! Whoop whoop! :-)

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