# How do you size an electric RC airplane motor?

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Electric motor power is stated in watts. 750 watts = 1 horsepower. An easy way to estimate power needs for RC hobby applications is to use 100 watts per pound for sport flying, 150 for aggressive aerobatics, 200 watts per pound for 3D flying.

## What size electric motor do I need for my RC plane?

It is accepted by most in the hobby that 100 Watts/lb is a darn good “estimate” for the power required for an average sports/aerobatic RC airplane. If you plan to fly high alpha 3D maneuvers you’ll want to bump that up to maybe 150-200 Watts/lb. You may want to lower this number for a high lift trainer type airplane.

## How do I choose the right motor for my RC plane?

If you select a motor with a higher kv and a smaller propeller the speed of the thrust will be higher, and as a result your plane will fly faster. For your first plane I recommend a motor kv between 850kv and 1500kv. The next factor to considering a motor is size.

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## How do I know what size prop for my RC plane?

If choosing a three or four bladed propeller, over a two bladed one, a very general rule of thumb is to decrease the prop diameter by an inch and increase the pitch by an inch, but on some models fuselage and ground clearance issues might dictate which propeller size you can and can’t have on the model.

## Which electric motor is equal to what glow engine?

60 size engine equals around 1200 watts and a . 90 size engine equals about 1800 watts of electrical power. When considering a 4-stroke glow engine, the conversion factor is around 1500 watts per cubic inch.

## What size electric motor do I need?

General rule of thumb: you need at least 2 lbs. of thrust for every 100 lbs. of fully-loaded boat weight (people and gear included).

## What do the numbers mean on RC electric motors?

Generally, the first two numbers indicate the diameter of the entire can of the motor OR the diameter of the stator (the inner part of the motor) only. … Similarly, the second pair of numbers can indicate either the height of the entire motor, or only the height of the stator.

## Which motor is used in RC plane?

There are two main different motor types used in model aircraft: The brushed and the brushless. containing a stator and a rotor.

## How do you size a brushless motor?

Typically the best place to start when sizing a brushless DC motor is matching motor size (diameter, length). Diameter ranges from 13 mm to 30 mm. Brushless DC slotted motor diameter and length are specified in inches.

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## Is 3 or 4 blade prop better?

A 3 blade propeller usually offers top speed performance while a 4 blade propeller provides maximum thrust and smooth cruising operation. Four blades have some features of their own, though. They often provide more lift at the stern which will help accelerate the hull, especially if it is stern heavy.

## What pitch prop is faster?

The lower the prop pitch, the better your hole-shot. However, this comes at a price: top speed. The lower pitch makes the engine reach maximum rpm at slower speeds. Conversely, a higher pitch will deliver greater top speeds, but slower acceleration.

## How do I choose a propeller size?

Propeller size is expressed with two numbers, diameter and pitch, with diameter always stated first. Diameter is two times the distance from the center of the hub to the tip of any blade. Smaller prop diameters generally go with smaller engines, or with fast high performing boats.

## What is a 540 size motor?

540 has a diameter of 36mm. 380 has a diameter ~28mm. 280 has a diameter of 24mm. The S, L or XL after the numbers refers to the motor length.

## How do I change my Nitro RC to electric?

How to Make a Gas RC Into Fast Electric RC

1. Step 1: Take the Engine Off. First you will have to take the engine, speed controlling servo, battery case, and fuel tank off. …
2. Step 3: Build a Motor Mount. You will have to build a motor mount. …
3. Step 4: Add Tension. …
4. Step 5: Install the Electronics.
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## Is a higher kV motor faster?

Kv describes the RPM (revolutions per minute) a motor does per Volt that is put into it. Generally speaking the more Kv a motor has, the more RPM and more power. For example, a 9000Kv motor would be faster than a 2200Kv motor.