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CAPTAIN SIM FORUM › 757 Captain › 757 version 4.x (FSX ONLY) › Speed hold just staying at m.67

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Speed hold just staying at m.67 (Read 1817 times)

cs7571174 Full Member Offline Posts: 14 Joined: Oct 12^th, 2009	Speed hold just staying at m.67 Oct 16^th, 2009 at 1:07am	Print Post
	Really quick, can anyone help me, its seems like there are problems after problems. I got the fmc to work (thank you for the replies, they were helpfull. But now when I put the selected speed which is 300 knots, the autopilot's speed hold just stays at 237 knots even though I said it to go to .80. Help!


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Markoz CS Team Offline Posts: 12445 Location: Victoria, Australia Joined: Apr 24^th, 2009 Gender:	Re: Speed hold just staying at m.67 Reply #1 - Oct 16^th, 2009 at 1:22am	Print Post
	I think it has something to do with the Cost Index used. Also. The higher you go the slower the KIAS will be because the air is thinner. If you mean that the Autopilot won't switch between KIAS and MACH. I have that problem too. I usually let the FMC control the speed until just before the Localizer and Approach stage of the flight, so I don't worry about it. Mark

	Mark Fletcher PC: i7 10700K @3.8/5.1GHz \| 64GB DDR4 3200 \| 12GB RTX 4070 Super \| 32" LCD Monitor \| 1TB SSD + 2TB SSD + 2TB HDD \| Win 11 Pro
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cs7571174 Full Member Offline Posts: 14 Joined: Oct 12^th, 2009	Re: Speed hold just staying at m.67 Reply #2 - Oct 16^th, 2009 at 9:52pm	Print Post
	Markoz wrote on Oct 16^th, 2009 at 1:22am: I think it has something to do with the Cost Index used. Also. The higher you go the slower the KIAS will be because the air is thinner. If you mean that the Autopilot won't switch between KIAS and MACH. I have that problem too. I usually let the FMC control the speed until just before the Localizer and Approach stage of the flight, so I don't worry about it. Mark Thanks for replying, what should I set my cost index to? And everytime I engage the speed or heading hold, when I click to disengage it, it wont until I press the desengage button. Is this normal? And what exactly is the cost index?


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Markoz CS Team Offline Posts: 12445 Location: Victoria, Australia Joined: Apr 24^th, 2009 Gender:	Re: Speed hold just staying at m.67 Reply #3 - Oct 17^th, 2009 at 1:02am	Print Post
	cs7571174 wrote on Oct 16^th, 2009 at 9:52pm: Thanks for replying, what should I set my cost index to? And everytime I engage the speed or heading hold, when I click to disengage it, it wont until I press the desengage button. Is this normal? And what exactly is the cost index? I set the cost index at 0 (zero) for long distance flight and 100 (one hundred) for short flights. 0 = best fuel economy and longer range and slowest cruise speed 100 = worst fuel economy and less range and fastest cruise speed I'm sure I saw an article (Captain Sim 767 forum I think) that states that the settings in the real world range from 0000 to 9999 but I'm not sure if that is how the FMC is programmed. Someone who knows better than me can (hopefully) tell you if I'm wrong. I get pretty good results with those figures. It all comes down to fuel quantity plus cost index equals distance. For example: I flew from YMML (Melbourne Australia) to RPLL (Manila Philippines) with 100% fuel and a cost index of 20 and arrive with sufficient fuel left over. The flight was somewhere around 3420 nm. Mark EDIT: Here is the link to the Topic on Cost Indexing http://www.captainsim.org/yabb2/YaBB.pl?num=1248356813

	Mark Fletcher PC: i7 10700K @3.8/5.1GHz \| 64GB DDR4 3200 \| 12GB RTX 4070 Super \| 32" LCD Monitor \| 1TB SSD + 2TB SSD + 2TB HDD \| Win 11 Pro
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