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View Full Version : Whats the difference between inrunner motors and outrunner motors?


Lancifer
07-22-2008, 12:02 AM
Hello folks..ok so im going to build a plane over the winter months to come this year and i was wondering whats the difference between outrunner motors and inrunner motors? What should i use if im building a bigger plane? Im a newbie to this and i have successful flights with my Cub and my parkzone Spitfire and my girlfriend is getting me a Spektrum DX7 for christmas so i want to build a plane but i need to gather info and what i need to purchase to fully get my plane running as i usually buy RTF models so i never have to build anything except put the wings on and charge the battery and then im good to go so i definitely need alot of info. . Thanks:tc:

GreenAce92
07-22-2008, 12:18 AM
Inrunners produce higher rpms, less torque though, they have the spinning part on the inside

Outrunners they spin on the outside, more torque less rpms...

so basically
Outrunners no gearbox(some do however have gearboxes like Blade 400)
Inrunners gearbox...

inrunners are also used for high speed planes because of the insane rpms lol

thats all i know pretty much lol
good luck on your build

nice girlfriend ;)

Drewed
07-22-2008, 01:35 AM
In other words...
Inrunners : the magnets are on the shaft ( INSIDE ) and the windings are on the outside ( housing. ) OR the INner part is spining.

Out runners : The magnets are on outside ( housing ) and the winding are in the middle.

GT5500
07-24-2008, 04:44 PM
Most of the info is right, however while inrunners do produce higher rpms, the 400 size motors are available in the 1800-2200kv rpm range which means they can be used for a lot a 400 class planes without the need for a gearbox. For example my Minimag uses a 2000kv motor with a 6x4 prop which gives excellent performance without the need for a large prop, so inrunners are not only used for high speed applications without gearboxes.

Lancifer
07-24-2008, 06:09 PM
Thanks guys that does help. There is a review on here just about getting started when building an aircraft. I was actually thinking of getting this baby right here...NorthAmerican AT-6 Texan 160 - 82" Nitro Gas Radio Remote Controlled ARF RC Airplane..so its a nitro plane and i want to convert it to electric. Heres a link..http://www.raidentech.com/noamatte1608.html. I need to get a motor and dont know if it should be inrunner or outrunner and also ill need to get a ESC and ill have a Spektrum Dx7 that im getting for christmas and i was also thinking of using a 4 point prop as well. So do you think that this can be converted to electric even?? Let me know guys as i need to start picking out all of my pieces.

pd1
07-24-2008, 07:39 PM
The T-6 can be converted to electric.

I would check out the price of the motor, batteries, esc and charger before buying the airframe.

It's not the best set up for a beginner.
Could be pretty expensive.

Just my .02
Paul

ron_van_sommeren
07-25-2008, 09:36 PM
The T-6 ... .... It's not the best set up for a beginner.
Could be pretty expensive ...

To put it mildly. It's a disaster waiting to happen, don't do it, you will not 'fly' more than 5 meter and go home with a rather unelegant kit. Expensive, frustrating, crashing. Dangerous too, imagine an electric motor for this size plane all of a sudden comming to live!!! (While you are kneeling in front of it, spinner pointing at your wedding tackle). Start smaller in electrics, maybe foamies? Have a look in the beginner subforum, that will give you some idea about suited trainers. Trainers have high wings for stability. Forget about scale looks for now and get some experienced help (flying instructor) if possible. Join a club?

Have you read this already?
http://www.wattflyer.com/forums/forumdisplay.php?f=3
-> Everything You Wanted To Know About Electric Powered Flight

Prettig weekend ;) Ron

ron_van_sommeren
07-26-2008, 01:24 PM
... Outrunners they spin on the outside, more torque less rpms ...
... inrunners are also used for high speed planes because of the insane rpms lol ...

Not quite :D :)
http://www.rcgroups.com/forums/showthread.php?t=863071
http://www.rcgroups.com/forums/showthread.php?t=787391

384km/h video:
http://media.rc-network.de/showphoto.php?photo=3413
Full 15min version Dachau Speed Cup, electric and IC
http://verein.rc-network.de/10js/dachau_2008.avi

construction:
http://www.powercroco.de/12N10P3520speedscorpion.html
http://www.powercroco.de/reparaturen.html

Prettig weekend ;) Ron

Lancifer
07-26-2008, 03:26 PM
To put it mildly. It's a disaster waiting to happen, don't do it, you will not 'fly' more than 5 meter and go home with a rather unelegant kit. Expensive, frustrating, crashing. Dangerous too, imagine an electric motor for this size plane all of a sudden comming to live!!! (While you are kneeling in front of it, spinner pointing at your wedding tackle). Start smaller in electrics, maybe foamies? Have a look in the beginner subforum, that will give you some idea about suited trainers. Trainers have high wings for stability. Forget about scale looks for now and get some experienced help (flying instructor) if possible. Join a club?

Have you read this already?
http://www.wattflyer.com/forums/forumdisplay.php?f=3
-> Everything You Wanted To Know About Electric Powered Flight

Prettig weekend ;) Ron
Thanks Ron..i have read most of the beginners stuff and i have some flight time under my belt also. Im gett a Aileron trainer first and then i can get this one here. Im still in the decision making as i need to get oneto build while its snowinghere in Canada! Any suggestions on a great kit to buy???Anyone??????

pd1
07-26-2008, 03:57 PM
Mountain Models makes some very good kits.
Good for building and flying.
I have not had any, but there are a lot of people that swear by them.
I haven't heard anyone swear at them either.

Paul