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I'm on a short business trip and whiling away my idle time by laying out the part of the panel beneath the radio stack where the engine control knobs (throttle, mixture, prop) and other stuff goes.  Unfortunately, I'm unable to get to a real airplane cockpit to take measurements.

Can anyone recommend a proper spacing between control knobs?  The layout works well if the knobs are 1.5 inches center-to-center, but that looks kinda close on my paper template.  Also, what is the diameter of the average throttle/mixture/prop knob?

Thanks in advance.

- Rob Wolf

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
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Please send your photos and drawings to marvkaye@olsusa.com.