July 14, 20196 yr I thought this might be helpful for those wanting to set vspeeds for normal condition. Got this data from ATR performance chart book from a certain airline. Gross weight= 17t V1=104KTS V2=110KTS VAPP= 96KTS WHITE BUG= 121KTS RED BUG = 145KTS Gross Weight=18t V1=104kts V2=110KTS VAPP=99KTS WHITE BUG=125KTS RED BUG=149kts Gross Weight=19t V1=104kts V2=110KTS VAPP=102KTS WHITE BUG=129KTS RED BUG=153kts Gross Weight=20t V1=105kts V2=110KTS VAPP=105KTS WHITE BUG=132KTS RED BUG=157kts Gross Weight=21t V1=106kts V2=111KTS VAPP=108KTS WHITE BUG=136KTS RED BUG=161kts Gross Weight=21.5t V1=109kts V2=113KTS VAPP=109KTS WHITE BUG=138KTS RED BUG=163kts Gross Weight=22t V1=111kts V2=114KTS VAPP=111KTS WHITE BUG=139KTS RED BUG=165kts Gross Weight=22.5t V1=112kts V2=115KTS VAPP=113KTS WHITE BUG=140KTS RED BUG=167kts Gross Weight=23t [Take note 23t take off is only available on selected airlines that ordered such planes and i believe Carenado's version does not support it] V1=114kts V2=117KTS VAPP=115KTS WHITE BUG=141KTS RED BUG=169kts Additonal info: 1)Greenbug is your v1 and most v1s are the same with vr. 2)Redbug is your icing condition speeds meaning you never dip below the red bug speed with 0 flaps. 3)On approach it is fairly common to add vref+10kts on your vapp until down to below 100feet. So if your vapp is for e.g 112kts your approach would be around 122knots down to about 100feet above the airfield you would then slow down to your vapp. You have to take account of wind conditions as well but i guess this rough estimate would do its job. 4)ATR72-500 burns around 700kg fuel per hour so this should give u a rough estimate on fuel planning. 5)Initial climb would be your white bug speed+5kts. It is only recommended to climb with whitebug+5kts if you're trying to clear over terrain in good weather. Standard climb at acceleration height would be 170kts. 6)On one of our shortest runway with 1370m length we take off without packs on and no tailwind component is allowed. 7)Never operate hotel mode if you have tailwind component exceeding 5knots at the position your parking at. Reduced flaps landing configuration for flap 15 landing 17t vapp=107kts 18t vapp=111kts 19t vapp=114kts 20t vapp=117kts 21t vapp=120kts 22t vapp=124kts 22.5t vapp=125kts Well hope this helps.
July 14, 20196 yr Yes, indeed - thank you!! Cheers 🍺 "...now let's get this thing on the hump - we've got some flyin' to do!" ~ Major Kong from "Dr. Stranglove" Scott Cebula
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