The motor you referenced is similar to what you need, but too small to fly the model you want to get going.

OK - here is the 'e-stuff' I used to get my Grandson's going - the model was an own-design, roughly the same size as RM-Jr.

Motor - Suppo 2217-6 (A brushless, "outrunner" motor)
ESC - Suppo 30 Amp. (The ElectronicSpeedControl - you need this even if you only want to run at one speed)
Battery - 3s1p, 1500 mah LiPo (lithium polymer battery, 3 cells of 1500 mah and at least 15C)
Timer - Will Hubin timer

Assuming you don't know what all that is or where to get it here are two suppliers that have this stuff at reasonable prices:

www.lightflightrc.com
www.bphobbies.com

Email Will Hubin at:
[email protected]

They have the specified motor (though BP Hobbies calls it a BP 2217-6) and the speed controls (Again, BP or Suppo brand - same speed control). The motors are about $20, the ESC's are also about $20.

Both places will also have the batteries - you will want two or three as you cannot 'fast charge' these cells like Nicads. They are available cheaper from some Hong Kong based shippers but you will need to know what you want and how to order it - you will also need a Paypal account for just about all of the above (or a credit card). I can't tell you how much these will cost but roughly $20 each, delivered is a ballpark figure.

The "Timer" is the device that lets us fly these systems control-line and not need an RC receiver/transmitter - in it's most basic form, it turns the motor on for a specified amount of time and then turns it off again. The time is adjustable generally from about 1 minute up to about 7 minutes. Most have some other features and Will Hubin can actually custom program a unit to do exactly what you want it to do. It costs about $20 delivered also. There are other brands but the Hubin Timers use a small screwdriver to set the various parameters, while the others you have to get into "Programming" mode and learn how to set the program to do what you want.

The above system will allow about a 4 minute flight per battery (charge) or as I did to get the boys trained, a couple of shorter flights per battery. There is higher end stuff available, but this is about the minimum as far as expense and performance goes to fly that size plane. The batteries are the real heart of the system and they are getting better and less expensive.

In addition to the above, you will need a "Balancing Charger" for LiPo batteries and some kind of power supply to run it off of - again, you will find it easier to charge batteries at home and take them to the field - fly them - and bring them home to recharge. We have done some field charging, but it is more hassle than it is worth. The chargers are available (for smaller batteries like these) for about $25-$40 but be sure that it is a "Balancing" charger or that you get a separate "Balancer" - this is necessary to protect the batteries. The power supply for the charger should also be available from the same place you get the charger - I know that LightFlight RC and BP both have the chargers and power supplies and usually some kind of package deal.

I realize that the above represents a fairly hefty initial outlay (Somewhere around $150 probably) but once you have the above in hand, you won't need to buy fuel or glow plugs and you will have the power to do basic maneuvers on 52-55 foot lines.

Hope this helps - Feel free to ask any follow-up questions