Stefan:
We didn't have much growing up, either. I can still see my neighbors, with frayed launch wires, rubbing them across the terminals of their car battery, looking back over their shoulder to see the lift off.
I don't remember reading about that technique in any of the Estes catalogs.

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Just completed: Estes Cherokee-E, Estes Multi-Roc.

Current project: Painting the roll pattern on my new Ventris build, gifted me by the estimable Dr. Houchin.