Motor Kv

[Arsonistwithmatches]

I have an 18x8 propeller. I am trying to make a very energy efficient plane. Would it be worth buying a low kv motor such as this?

https://www.ebay.co.uk/i/3724680903...MIouzP353J5gIVg7TtCh1XkQ3lEAQYAiABEgL1d_D_BwE

 

[Wildthing]

They really don't give any specs on the motor for watts or even different recommended power setups so hard to say.
But just a prop and motor is only a small portion of putting together a power setup. Size and weight of plane, speed or slow flyer, size of esc, what batteries do you plan on running and so on.

 

[mach1 rc]

I have an 18x8 propeller. I am trying to make a very energy efficient plane. Would it be worth buying a low kv motor such as this?

https://www.ebay.co.uk/i/3724680903...MIouzP353J5gIVg7TtCh1XkQ3lEAQYAiABEgL1d_D_BwE

A flying wing would be a great plane for efficiency.

 

[Merv]

I did not see any prop recommendation from the manufacturer, I have no idea if this motor will work with a 18x8 prop.

In general large props turning slowly are more efficient than small props turning fast. That is they will produce more thrust per watt.

 

[skymaster]

is this a gas or electric propeller ?

 

[Arsonistwithmatches]

They really don't give any specs on the motor for watts or even different recommended power setups so hard to say.
But just a prop and motor is only a small portion of putting together a power setup. Size and weight of plane, speed or slow flyer, size of esc, what batteries do you plan on running and so on.

Slow flying glider with solar panels to charge the lipo. This is the lipo i will be using https://www.ebay.co.uk/i/1415017106...MIm46u5NTN5gIVRLTtCh3JywliEAQYASABEgIw4PD_BwE

 

[skymaster]

maybe you should look at a motor that has a gearbox . A small plastic gearbox between the motor and propeller reduces the output speed and increases the torque of the propeller shaft. This allows the airplane to use a larger propeller that produces more torque.

 

[Wildthing]

How large is this glider? What about a folding prop so when you are not under throttle you don't have any prop drag?