How to go from rpm to hp or W.

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In summary, the conversation was about finding the maximum speed of an O.S 61FX RC airplane motor with a 13x6 propeller that can reach 10400rpm. The discussion also mentioned that this calculation may not be exact and suggested checking the manufacturer's website. It was clarified that the maximum speed mentioned refers to the forward speed of the airplane without any load or weight.
  • #1
boyongo
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Im trying to get the Hp or W for the O.S 61FX RC airplane motor that has a propeller size 13x6 that give 10400rpm. The reason for this is to know the max speed that it can obtain discarding the weight and everything.
 
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  • #2
The propeller has a 6 inch "pitch". At 10,400 rpm that translates into 86.67 feet / second or 59.1 mph in a no load situation. Actual max speed of the rc model will be much less.
 
  • #3
Can't you look it up on OS's website? Calculating will be inexact...
 
  • #4
Just to be sure @ rcgldr we are talking about forward speed (velocity that the airplane is going to be traveling without any load and discarding the weight of the plane)?
 
  • #5
boyongo said:
Just to be sure @ rcgldr we are talking about forward speed (velocity that the airplane is going to be traveling without any load and discarding the weight of the plane)?
It would be better to say that if the plane were in a steep or vertical dive (and could achieve 59 mph speed with no power in a dive), that would be the speed where the prop would not experience a forward or backward load (only a torque load).
 

What is the formula for converting rpm to horsepower?

The formula for converting rpm (revolutions per minute) to horsepower (hp) is: hp = (rpm * torque) / 5252, where torque is measured in pound-feet (lb-ft).

Can you explain the relationship between rpm and horsepower?

Rpm and horsepower are closely related because horsepower is a measure of the rate at which work is done, and rpm is a measure of how quickly an engine is rotating. As rpm increases, so does the amount of work that can be done, resulting in a higher horsepower output.

Is there a difference between horsepower and watts?

Yes, there is a difference between horsepower and watts. Horsepower is a unit of power commonly used in the automotive and mechanical industries, whereas watts is a unit of power used in the electrical industry. However, they can be converted using the formula 1 hp = 746 watts.

Do all engines have the same horsepower at the same rpm?

No, not all engines have the same horsepower at the same rpm. The horsepower output of an engine depends on various factors such as engine size, design, and efficiency. Two engines with the same rpm can have different horsepower outputs.

What are some factors that can affect the conversion of rpm to horsepower?

The conversion of rpm to horsepower can be affected by factors such as engine size, design, efficiency, temperature, and altitude. These factors can impact the engine's performance and, therefore, affect the horsepower output.

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