To anyone,

I am just wondering general rules of thumb for changing stuff on a Thunder Tiger 40 between three different variables:

1. Larger diameter x Small pitch Prop vs. Small diameter x Large Pitch Prop
2. Lower head with thinner shim than stock (0.014-0.017 vs 0.003 to 0.005)
3. Colder or hotter plugs

Hear is the fixed parts.

1. Course is short - 2 poles at 400 ft.
2. Plane is relatively draggy compared to a Q500 - Club 40 Sky Raider Mach II or LA Racer 40
3. Plane is relatively heavy compared to a Q500 - 4-1/2 lbs.

OK, let me add the last variables of weather:

1. Hot, and humid vs. Cooler and dry (75% humidity vs. 25% humidity), 0 to 600 ft above sea level.
2. Windy vs. Calm (15mph vs. 5mph)

What should be the rules of thumb for the first three items based on the second three fixed items to account for changes in weather of the last two items?

Any input is appreciated.

Thanks,

Mike W