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Originally Posted by Otto
1. Just how big does a side mirror need to be?
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I'd like to see both the ground and the vehicles aft and to the side of me.
On the earlier S40/V50 that wasn't the case: adjusted to see traffic, they're rather useless for parking, and vice-versa. So they were increased in size on later models.
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3. If the RAF Spitfire fighter plane of WWII got by with a faired ~4" round mirror on a ~4" thin stalk and flew at ~400mph (apparently with no ill effects), why do we ~70 years later need anything bigger or less streamlined?
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The old Spit lost a few mph in top speed because of the external mirror, despite having well over 1000 HP
Probably lost a couple mpg as well, but no-one was keeping track of that back then.