My proposal says that IC airplanes will be weighed full of fuel. In my opinion, at processing, either you can take off the canopy and show the official the tank is full, or bring your fuel supply and show that it is filled to overflow. For spot checks, you can weigh the model while the pilot is in the ready box. My proposal does say that all weighing has to be done inside, so you need a tent at the flight line to spot check. Weighing in a strong wind like was done at this years Nats is really difficult to do correctly.

I'm sure that you can come up with a hundred ways to cheat the system, but I believe everyone attending the Nats will not do that. And let's face it, the Nats is the only contest we are talking about.