My second plane was a Tiger 60 ARF. In fact, I just sold it to a fellow club member after having it for over 5 years and flying it often. Good second plane, or third, or whatever, for that matter.

Anyway, I used standard Airtronics servos, which I believe are the same torque rating as the Futaba's you mentioned. And it flew just fine. I also used the standard 4.8v 800 mah battery that came with the RD6000 radio, which I also believe is the same size as just about every other standard setup that comes with the radio.

Now, with that said, there is absolutely nothing wrong with adding a little torque to the elevator rudder and ailerons. The cost difference is not that great, and it gives you some assurance that it will work with authority, but I wouldn't worry about it for your son for now. If you want more authorty later on you can do one of two things: swap out to a 6 volt battery pack, or go to higher torque servos. Your call. Either way, it isn't that much of a job to swap. The battery, of course, is the easiest to do, the servos will take a little longer.

As a note, I have been pretty consistently using a Venim 1200 mah 6 volt (five cells) NiMH battery pack in my planes. The brand name is only mentinoed because that's what I can get at my Local Hobby Shop. He stocks the Venims, so that's what I get. If he had Eveready's, I get those, so brand name isn't all that big a deal. The reason I use the larger batteries is because I like the servo response of the 6 volt pack, and I want the higher capacity because I have been swapping out the Airtronics system with the new Spektrum DX7 2.4 GHz system. They tend to draw a tad bit more current (not much more, but slightly more) and I don't want to get into the threshold of reboot that the DX7 RX has (and I understand all the other 2.4 Gig receiver processors go through at low voltages) even though I never NEVER allow my RX batteries to even come close to those thresholds.

Best of luck with the build and keep us informed via this forum as to the progress of the build.

CGr.