Originally Posted by waynemia
Low torque digitals are fine as long as you only need low torque on the plane.
72MHz vs 2.4GHz - Just RF frequencies.
The real difference is in the data modes. As the computers have improved, new communications modes. Frequency hopping started in amateur radio quite some time ago.
Sometimes the frequencies used are just a matter of the FCC and world frequency allocations for various purposes which, in part, is based on the band-width of the data modes used.
In general, as the data rates increase, the bandwidth increases. Dealing with a channelized band, there are restrictions to how much you can increase band-width before you have channel to channel interference.
Bandwidth and Resolution seems to be the drivers that are really increasing with these products. Radio resolution really helps take advantage to the digital servo for more refine movements. Freq is just the carrier... Not a lot of people bother to look beyond that to Wayne's point.
My buddies Turbine Jet, doesnt need a lot of through, a lot of torque, but fair speed and accurate centering are key. A trainer plane just needs enough torque to carry and speed and centering are not critical.
I got to see a set of servos in a large scale plane, very very strong and fast digital servos. The amazing part.... They were silent, even under a load, nother but hinge is heard.