Indeed, because it gives you a lot of drag and...oh wait, that's not the case in CloD!
BY the way, I've flown in a Tiger Moth, and I couldn't even hear what the pilot said on the intercom. Only some faint shhhh-kshhhhhhh.
Also, if you read any personal accounts it's unquestionably clear that you couldn't possibly hear another aircraft from yours. The sound is way too similar, and your engine is way too loud. Being warned about an attack by hearing his engine is something completely unheard of in real life. I have yet to find a singe account that contradicts this.