"When the vents are OPEN (or OUT), more warm air will reach the rider.When the vents are CLOSED (or IN), less warm air will reach the rider."
I conducted a field trial this weekend [unplanned, but still conducted].
Start of trial:
Riding home from visiting sister via Colorado mountain roads [uS50, CO9, & US285], nominal 75°F, partly sunny and only three vehicles in 50 miles allowed some three digit speed testing
; vents IN ==> can feel warm air either via gloved hands and on the legs near top of boot.
Trial step 1)
Two hours from out partly sunny becomes afternoon rain and I discover rain pants are not on board, jeans it is then. First 30 minutes of steady rain & 49°F, now at near legal speeds with vents IN ==> can NOT feel warm air via wet gloved hands or on wet legs; legs soaked and I am cold [NOTE to self: get the Widder's plug installed! and Review that hand guard thing on wc's site]. I stop for fuel in Fairplay and to warm up.
Trial step 2)
Forcast is now: ninty minutes to home in rain and 49°F; let's try the vents OUT setting [it can't be colder]. Next 40 minutes of steady rain & 49 to 52°F at near legal speeds vents OUT ==> can feel warm air via wet glove at near the top of the vent at the tank [enough warmth to un-stiffen the cold hand] and ride seems warmer [or my body just reached its cold/wet balance point]. Ran thru rain by Bailey and temps now begin to increase.
Trial step 3)
Next 50 minute are sunny with rising temps 56 to 85 °F at near legal speeds vent OUT ==> knee cap area of pants dry first, then upper/outer thigh area. Knee area dry to the touch by home, but the rest remains damp to the touch.
FYI & YMMV, no I do not plan a repeat trial with reverse trial sets this weekend [moving youngest into college this weekend :yahoo: for him and me]
rublenoon