Three one-hour workshops for 3rd/4th graders

Hi,

I agreed to do three one-hour workshops for one group of 10 third and
fourth graders (the same children for all three weeks.) The workshops
are during school and will be in a classroom (or outside), visiting
the airport is not feasible. They will be GA focused (although billed
as the "Wonder of Flight).

Now I need to plan the workshops, and I'm asking for suggestions for
activities, with pointers to details if possible. I could easily
lecture for three hours straight, but that's not going to work with
ten 9-year old boys (most likely).

Here are a few of the things I plan to do:

1) I'll bring in variety of airplane parts (prop, cylinder, piston,
instruments, and whatever else I can get.) I'll have the kids sketch
them, which means they'll study the details more. Then we'll figure
out what the details are for (what do the fins on the cylinders do,
for example?)

2) I'll probably start each session by listening to the local ATIS on
the handheld (and perhaps by calling WX-BRIEF for the recording if I
have a speaker phone) and making a go/no-go decision based on the
weather (and maybe I'M SAFE.) That will lead us to learning a bit
about weather.

3) If I can make a crude wind-tunnel with a window fan and build
airfoils to learn something, I'll do so (any suggestions or experience
here would be helpful)

4) We'll make the equivalent of balsa-wood airplanes with cereal-box
cardboard (I don't have the nerve to really use balsa and the sharp
knives required.) I tried cardboard planes at home, and they can fly
pretty well if properly balanced, and they really demonstrate the
downside of an aft CG if not.

5) There will be a chart session with old sectionals (they'll plan a
route somewhere, figure out the heading, look for obstructions, etc.)

6) I may have a hang glider pilot bring in his kite.

Suggestions for other feasible activities or materials you are aware
of?

Thanks for your help.