I have tons of all sorts of wasps where I live including the one you're talking about - probably the potter wasp. Huge suckers with a yellow abdomen that sound like a B17 when they fly by. They're not as aggressive as paper wasps but they pack a good sting. Leave them alone but if they intrude on your space I find a direct hit with Mortein surface spray knocks them down almost instantly.
Cheers, Marcus
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