KEVLAR is invisible to EM/RF, so is fiberglass. Carbon is like a big fat honking resistor, therefore an important (negative) issue. The size of the apertures between the weave on a typical fuselage utilizing carbon and/or KEVLAR are much smaller than any resonant portions of a wavelength @ 72MHz. This means the weave will restrict RF (not stop - carbon is dissaptive and still able to transmit energy).

The microwave oven door has apertures that indeed disallow transmission of energy "through" the small holes, but still allow you to see that weiner explode. This is because the hole diameter is not a mutliple @ lambda, AND the screen is metal (conductive). Then again...you would be well-advised to really keep the the rugrats away from watching food burn no matter what, if folks only knew...chack that door gasket for integrity.

Jon Stone wrote:

I have had carbon fuses in the past. Antenna completely inside, and no range problems. I've also owned carbon/kevlar weave fuses that were horrible with range. I also know of others planes known for having radio range problems that have the fuse made from a carbon-kevlar weave cloth. My point is not to bash any particular plane, so none were mentioned.
I'm thinking the carbon/kevlar weave might be similar to the grating that keeps certain frequency RF from escaping microwave ovens. I'm guessing the weave may somehow be different, RF wise, than a carbon only cloth fuse.
Is the type of cloth a fuselage is made of, even an issue? Regards,
Jon

-- Simon Van Leeuwen RADIUS SYSTEMS PnP SYSTEMS - The E-Harness of Choice Cogito Ergo Zooom

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