I've already gotten some great input from people like Rocket and others.
I've tweaked a few of the zip this evening:
ah_p51d.zip
(engine redone)
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ah_f4u1c.zip
added BANG for cartridge starter and engine redone for bigger ballz)
ah_f4u1d.zip
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ah_C47a.zip
(minor changes. decrease gear volume and pitch.)
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ah_190a8.zip
(engine redone for bigger ballz)
Any more comments or suggestions are welcome.
Regards,
Wab