Guys, here is some advice from a REALLY old (1970's) Pylon race (MOM) pilot:
One problem with the pilot/spotter combination is that the spotter is supposed to warn the pilot exactly when to turn, but how do you do it really well?
We found that a sudden "TURN" command from the spotter and a pat on the shoulder is ALWAYS too late. The pilot cannot anticipate the turn unless he uses another trick. (later)
Better is, as the model gets close, the spotter says: "Aaaaaand TURN!: with the "Aaaand" part pre-warning the pilot he's going to turn. That way you can get some really crisp turns.
Occasionally, but not often, we used to have races with no spotters. In this case, a good trick is to fly some laps up and down the course. On the downside, normally, on the right-side turn, watch the model carefully, and when you get the turn just right, line up the model with some kind of marker - a rock, bush, something visible which you can use as a signal to turn. In the race, as soon as the model passes the marker, turn. You'll be really consistent, and if your marking is accurate, you'll lose little time. Of course, you can use this with a spotter too, as a warning that a turn is imminent.
...I have to get over to the USA next year...Green? I'm like a St. Patrick's Day bloody elf!
Cheers,
Doc.