# Questions tagged [efficiency]

Efficiency signifies a peak level of performance that uses the least amount of inputs to achieve the highest amount of output. It minimizes the waste of resources such as energy while accomplishing the desired output.

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### how to calculate the efficiency of hybrid drones?

I'm looking at this new kind of drones: https://www.xer-tech.com/drones/x8/ And I'm trying to calculate the overall efficiency of the powertrain. The numbers I'm getting don't really match up to the ...
1 vote
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### I am confused on how to measure thrust for a propeller and would like some help

For my science project, I am measuring the power and efficiency of different propellers. I was researching thrust stands and that seems to be the best way to measure thrust. I already have a brushless ...
1 vote
80 views

### Is 1 large propeller more efficient than 2 smaller propellers (if both cover the same area)?

Is there a reason in efficiency to prefer 1 large propeller over 2 smaller propellers, when both cover the same area? With same area, I mean i.e. $r_{small} = 1$ \$ A_{small} = \pi * r^2 = \pi * 1^2 =...
1 vote
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### Should I use a tandem wing for my RC aircraft?

I am designing an RC airplane. My goal weight is under 10 lbs so I'm designing parameters based off of a 10 lb weight to allow for some overshoot. I also would like the wingspan to be around 4.5 ft ...
53 views

### Error in the explanation of Ingenuity: The Mars Helicopter by NASA members?

I was watching this video by Veritasium on Youtube, where he talks with NASA engineers about the Mars helicopter. At the attached timestamp they talk about how a completely overlapping rotor ...
291 views

### Influence of propeller blade shape and tip shape on its behaviour?

Newbie here, still learning how to fly and having to buy new propellers. Of the various properties to be chosen among, there are two that have me a bit baffled: symmetrical vs. undercambered and ...
792 views

### How to choose the most efficient (thrust per watt) motor+propeller setup for a drone?

I'm designing a quadcopter weighing around 250 grams, while maintaining a thrust-to-weight ratio of 2:1 Optimize: Maximize the thrust-per-watt for the motor+propeller pair Constraints: weight of each ...
71 views

### If AUW is 90 grams, will 4500Kv motors be better than 7500Kv?

I have a build that is 90 grams and runs great with 7600Kv motors. My question is, if everything stays the same and I put on 1204 4500Kv motors on it, would I get more flight time? More power or ...
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### Why are larger propellers generally more efficient than smaller ones?

In almost every case, long-range drones use larger propellers than other drones that don't need to travel very far or don't need to fly for very long. I have heard that a major reason for this is ...