hi our table top at broxtowe is exactly the same 4' at 30deg = 2' high
we have added another 2' section approx 3rd up the ramp to ease takeoff,
without it the cars slap down too hard, but the 30deg is spot on for takeoff easily covering the 9' length. you may want to think about the height as the cars will be able to clear a massive distance with quite a short runup!
cheers andy
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BMCC east midlands No1
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