I would like to point out, that there are two members named "Tom" are posting here, dont get confused with the statements

Hi Harry, what is "RW"? The FMS will just calculate this value, are u using a table to confirm that speed during flt ops? To recheck the computation of the FMS?

RW - Real WorldDuring flight preparation used to note (on the TO Data Card) Vsr/Vcl and where applicable Vmcg, for check on the FMS calculation and as a general awareness.Also checked the RW table with the PMDG Take-off page for a wide range of TO weights. Not to my surprise all Vcl speeds were calculated the same as in the table.1.5g: can not find a definition discription of Vcl right away.But taking 220T / 250 kts as an example: if 250 is 1.5g than Vstall 166. Having a look in my Stall Speed graph, reveils a clean 1g stall speed of 168. Close enough I would think.

If I may ask you another question: what is the Vmin for 220T according to your knowledge?Thanks!

Vmin 220T, clean configuration and 1g, is 220 kts.Regards,Harry

Vmin 220T, clean configuration and 1g, is 220 kts.Regards,Harry

Thanks Harry, can u explain the difference of the speed at the weight of 220T, 250kts to 220kts?Lets say your aircraft weight is 220T, clean config, what speed are you flying? (ALT < FL100).The Vstall of 168 is correct, I agree!TOM M.

double post. SORRY!

Thanks Harry, can u explain the difference of the speeds at the weight of 220T, 250kts to 220kts?Lets say your aircraft weight is 220T, clean config, what speed are you flying? (ALT < FL100).The Vstall of 168 is correct, I agree!TOM M.

Tom,220 kts is a minimum manoeuver speed, 250 is an normal operating speed below 10000.For heavier weights, if 250 is too slow, in agreement with ATC higher speeds are possible.If it does not really fit into ATC's pattern, delaying slat retraction is a good option.For Departure and Arrival (apart from MaxLdgWeight), I would fly 250 kts as long as possible because:- it gives a better L/D, more economic.- it gives a manoeuver margin above Vmin+5. (not that importent yet cause Vmin is a static value now and not g load dependent).Harry

Tom,220 kts is a minimum manoeuver speed, 250 is an normal operating speed below 10000.For heavier weights, if 250 is too slow, in agreement with ATC higher speeds are possible.If it does not really fit into ATC's pattern, delaying slat retraction is a good option.For Departure and Arrival (apart from MaxLdgWeight), I would fly 250 kts as long as possible because:- it gives a better L/D, more economic.- it gives a manoeuver margin above Vmin+5. (not that importent yet cause Vmin is a static value now and not g load dependent).Harry

I dont agree with most of the things you say, sorry!Explain one thing: Vmin is a static value???Lets say you are in a 60 deg bank turn (u would not do that on a MD-11, I know), the g-load is how much? Why is Vmin not changing?? Does not make sence at all, right?Thanks Harry for your patience, we all can learn a lot, at any time!

- it gives a manoeuver margin above Vmin+5. (not that importent yet cause Vmin is a static value now and not g load dependent).Harry

The normal manoeuvring speed in clean config is VMIN+20 because of the increasing VMIN during turns. Can you explain why it isn't important?Floris

I dont agree with most of the things you say, sorry!Explain one thing: Vmin is a static value???Lets say you are in a 60 deg bank turn (u would not do that on a MD-11, I know), the g-load is how much? Why is Vmin not changing?? Does not make sence at all, right?Thanks Harry for your patience, we all can learn a lot, at any time!

Tom,I'm aware of your previous posting on the Vmin amber band indication during turns.I also provided some info there and have read Vangelis's statements.Answering your question [Explain one thing: Vmin is a static value???]In the present MD-11 simulation Vmin is a static value, depending on weight and configuration only.On the real plane, Vmin value is depending on weight, configuration AND g-load.Harry

The normal manoeuvring speed in clean config is VMIN+20 because of the increasing VMIN during turns. Can you explain why it isn't important?Floris

Floris,As it is programmed in the simulation now, there are little consequences flying Vmin+5 during turns. So now it's not that important for simulation purposes.[The normal manoeuvring speed in clean config is VMIN+20 because of the increasing VMIN during turns]I was and am well aware of that in real world operation. Same company, '93 till '04. ;-)Regards,Hary

Floris,As it is programmed in the simulation now, there are little consequences flying Vmin+5 during turns. So now it's not that important for simulation purposes.[The normal manoeuvring speed in clean config is VMIN+20 because of the increasing VMIN during turns]I was and am well aware of that in real world operation. Same company, '93 till '04. ;-)Regards,Hary

Thanks Harry :)Regards, Floris