IAS Speed Bugs ?

[gritz 0]

I know that setting cyan speed bug (VR) will give you a "Call Out" to rotate, but is there more to it than that ... such as some interaction with the aircraft computers? And on Approach ..... should I move the VYSE (green - Approach and Touchdown) to the upper left hand corner prior to landing? I'm not getting the relevance to setting the speed bugs ... unless it's just for reference? I could not find a whole lot of explanation the the Operators Manuals. :(

[CapP 0]

Well, i think it is 'just' for reference, but quite an important reference. Imagine some problem during take-off or landing and you are very busy to keep the plane flying and you also have to remember four speeds... I think it's quite handy and saver to have them next to your speedtape!

[Guest Jimmatc]

Is it the meaning of the speeds you're after? This is a general outline:V1 = takeoff decision speed (e.g. if something breaks before this speed you'll have enough runway to abort the takeoff)Vr = rotate speed (time to go flying!)V2 = takeoff safety speed (if one of your engines quits on takeoff, this is your minimum safe speed)Vyse = best single-engine rate of climbIn this sim it is assumed the runways are non-limiting, e.g. V1 = VR because at rotate speed you still have enough runway to stop. Shorter runways could be limiting and require more calculations for V1.As for the landing:Target = the speed at which you should aim to fly your final approach to about 200'Vref = landing reference speed (from 200' you should slow to cross the fence at this speed)V2 = same again, if an engine quits maintain at least thisVyse = same again, on one engine this gives you the best rate of up

[gritz 0]

Thanks James, I'm doing a cut and paste now to add to my 3-ring binder........ I appreciate. A question I have though is why do we set each one individually? Is there any specific purpose besides just to use as a reference?Jim

[downscc 1,327]

True, the Vref is the key during normal ops but in a twin you are always expecting an engine failure and those speeds on the tape may save your hinny.

[Guest Jimmatc]

Exactly, if one of your donks quits on you there ain't no time to start looking speeds up!

[gritz 0]

Got it! Thanks for clearing that up for me. :(