I have been trying to find out what a 300, 400,450,500 size electric motor is. What do the numbers imply and how does one know the wattage of the motor.
How large is a 250 size plane or a 300 size plane.
Any explanation/ link is welcome
regards
Avijit

A quick search : http://www.rc-airplane-world.com/electric-motor-numbers.html

It is the length.

The Bible, I guess:

http://www.mabuchi-motor.co.jp/en_US/product/p_0300.html

The gist, quoted from the link in Reply #1.

Quote
In a nutshell, the majority of electric motor designations refer to the physical size of the motor. For example, 'Park 400' refers to a fairly standard size brushed motor around the 40mm long mark. The chances are that it's actually 37 or 38 mm long, and is, or a variant of, the famous Mabuchi 380 motor.
A '300' size motor would be in the vicinity of 30mm in length, and so on.

Brushless motors are also numbered in terms of their physical size - the ABCD/E numbering system usually gives the stator diameter (AB), the stator length (CD) and the number of turns, E.

Very useful info

As an engineer, when we select motors, what specifies is Torque & RPM, or turning it around, Power (Watts) and RPM (KV being the determinant for DC motors.) Resistance is a useful yardstick in comparing two apparently identical motors, giving an indication of heat build-up at a specific current.

For the modeller, Thrust is also important which is related to the prop used on a particular motor. Current drawn is important in selection of battery & ESC, and determining heating.

I have only entered Electric models a few months ago, and would stand corrected if wrong, as I may well be

Hi All,
Please can I have the link for the most competive seller for ;Himax HC3516-1130 motor _ and a Multiplex or similar MULTIcont BL-55 ESC Speed controller.

I need power system for two planes;
D A a scratchbuilt Depron foamy around 3 pounds//1.25KG
and
MPX ACROMASTER  approx 1.5 Kg plane

If possible want to stick with 3 cell lipos... It seems all these motors are only suitable for a 4 cell set up. My hanger is all geared up for 3 cells but if I have to, I guess I will have to invest in 4 cell packs...!! 

Even though I have been in RC for quite some time, my knowledge on motors and ESC is quite limited so any suggestions and help from the veterans will be welcome.

I have used this NTM Hobbyking motor for my FORMOSA 2 a 800 gram model and it is a Bazooka..

Need a motor like this not too expensive and propels the plane fast enough.... 

Suggestions please

Thanks

Model: NTM Prop Drive 35-36B 1400
Kv: 1400rpm/v            Turns: 7      Max current: 53.94A Max Power: 495W @ 12v (3S) /      Shaft: 4mm    Weight: 117g     ESC: 60A
Cell count: 3s~4s Lipoly    Bolt holes: 18.9mm & 25mm
Bolt thread: M3   PRODUCT ID: NTM3536B-1400
http://www.youtube.com/watch?v=81IzfoTQ29Q&list=PL40C2660F3E6562B1&index=42

Deepak, a 3536-1400 should be adequate for this at 3S. If you still feel it's short, go for a 3542-1250 KV - I used that in my 1.8 Kg Spadstick, and it would go vertical.

http://www.rcindia.org/electric-planes/spadstick-electric-(full-size)/

Thanks Sanj did you get it from Hobby King ? Please can you upload a link where you bought the motor from.
Thanks
Deepak

Just use the search feature in HK. Its in Turnigy and NTM