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#21
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preparing for commercial oral and practical
Mark T. Dame wrote:
The intricacy's of weight and balance similar to the knowledge test questions. Load, fly, unload, fly, refuel, load, fly unload, refuel.... what's your weight, where's your CG, what about if you have to hold, when will you reach bingo fuel and where will your CG be then? Talk to a Bonanza owner about CG changes with fuel burn. Additionally, your CG probably changes when you retract your gear. That's one of my commercial DE's pet points. While being technically correct (if he says so), what difference does it make? Are you going to fly with the gear down to keep the CG in the same place that you used to figure your W&B? Cocktail party facts.... -- Mortimer Schnerd, RN mschnerdatcarolina.rr.com |
#22
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preparing for commercial oral and practical
While being technically correct (if he says so), what difference does it make?
Half an inch in an Arrow. Jose -- Quantum Mechanics is like this: God =does= play dice with the universe, except there's no God, and there's no dice. And maybe there's no universe. for Email, make the obvious change in the address. |
#23
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preparing for commercial oral and practical
On 05/14/07 14:03, Mortimer Schnerd, RN wrote:
Mark T. Dame wrote: The intricacy's of weight and balance similar to the knowledge test questions. Load, fly, unload, fly, refuel, load, fly unload, refuel.... what's your weight, where's your CG, what about if you have to hold, when will you reach bingo fuel and where will your CG be then? Talk to a Bonanza owner about CG changes with fuel burn. Additionally, your CG probably changes when you retract your gear. That's one of my commercial DE's pet points. While being technically correct (if he says so), what difference does it make? Are you going to fly with the gear down to keep the CG in the same place that you used to figure your W&B? Cocktail party facts.... I'm sure it was more a matter of making sure the pilot understood how the gear affected the CG - and not that it would change the flight characteristics all that much. -- Mark Hansen, PP-ASEL, Instrument Airplane, USUA Ultralight Pilot Cal Aggie Flying Farmers Sacramento, CA |
#24
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preparing for commercial oral and practical
Mortimer Schnerd, RN wrote:
Mark T. Dame wrote: The intricacy's of weight and balance similar to the knowledge test questions. Load, fly, unload, fly, refuel, load, fly unload, refuel.... what's your weight, where's your CG, what about if you have to hold, when will you reach bingo fuel and where will your CG be then? Talk to a Bonanza owner about CG changes with fuel burn. Additionally, your CG probably changes when you retract your gear. That's one of my commercial DE's pet points. While being technically correct (if he says so), what difference does it make? Are you going to fly with the gear down to keep the CG in the same place that you used to figure your W&B? You calculate balance for both gear down and gear up for both takeoff and landing loading. All four must be within the envelope or you don't go. Matt |
#25
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preparing for commercial oral and practical
Matt Whiting wrote:
While being technically correct (if he says so), what difference does it make? Are you going to fly with the gear down to keep the CG in the same place that you used to figure your W&B? You calculate balance for both gear down and gear up for both takeoff and landing loading. All four must be within the envelope or you don't go. Really? In the C-210 if I couldn't get the doors closed we wouldn't go, but I don't recall any other occasions. G Seriously, I've never been required to do more than one W&B for any flight I've ever made, and I don't recall that the gear position was ever even considered. I've never failed a written test or check ride either, including regular part 135 rides. -- Mortimer Schnerd, RN mschnerdatcarolina.rr.com |
#26
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preparing for commercial oral and practical
Mortimer Schnerd, RN wrote:
Matt Whiting wrote: While being technically correct (if he says so), what difference does it make? Are you going to fly with the gear down to keep the CG in the same place that you used to figure your W&B? You calculate balance for both gear down and gear up for both takeoff and landing loading. All four must be within the envelope or you don't go. Really? In the C-210 if I couldn't get the doors closed we wouldn't go, but I don't recall any other occasions. G Really. Seriously, I've never been required to do more than one W&B for any flight I've ever made, and I don't recall that the gear position was ever even considered. I've never failed a written test or check ride either, including regular part 135 rides. Some instructors and examiners are more thorough than others. Not all will test for everything, but checking to see that the W&B aren't exceeded during all phases of flight is a pretty basic check. Matt |
#27
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preparing for commercial oral and practical
Mortimer Schnerd, RN wrote:
Mark T. Dame wrote: The intricacy's of weight and balance similar to the knowledge test questions. Load, fly, unload, fly, refuel, load, fly unload, refuel.... what's your weight, where's your CG, what about if you have to hold, when will you reach bingo fuel and where will your CG be then? Talk to a Bonanza owner about CG changes with fuel burn. Additionally, your CG probably changes when you retract your gear. That's one of my commercial DE's pet points. While being technically correct (if he says so), what difference does it make? Are you going to fly with the gear down to keep the CG in the same place that you used to figure your W&B? Cocktail party facts.... Not at all. We're talking about a commercial pilot checkride. As such, you need to know more than for a private certificate. The point of the exercise is to show the examiner that you understand these concepts and actually do it. Additionally, you do have the gear in both positions in flight. You have it down at take off. You need to make sure that putting it up isn't going to put your CG outside of the envelope right after take off when you are still low, slow, and nose high. This could lead to a departure stall. When you are landing, you put your gear down well before you touch down, and you will be low and slow on final. The difference between gear up and down may be a factor. Now, as Jose pointed out, on the Arrow it's not very significant, but that doesn't mean that it's that way for all planes. Finally, as I said, we're talking about a checkride. Checkrides often have you do things that you may not do in your day to day flying, but you need to know and understand in case you need it. In any case, I'm just giving advice on what to expect on the checkride. -m -- ## Mark T. Dame ## CP-ASEL, AGI ## insert tail number here ## KHAO, KISZ "Love is a snowmobile racing across the tundra and then suddenly it flips over, pinning you underneath. At night, the ice weasels come." -- Matt Groening |
#28
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preparing for commercial oral and practical
Mortimer Schnerd, RN wrote:
Seriously, I've never been required to do more than one W&B for any flight I've ever made, and I don't recall that the gear position was ever even considered. I've never failed a written test or check ride either, including regular part 135 rides. For both my private and commercial rides I was required to do a W&B for takeoff and landing fuel loads. Additionally, for my commercial ride, I had to account for the gear position, as Matt said, giving you four different configurations. This was another point of emphasis for my DE. Different examiners have different favorite topics. For the purpose of the original question, my suggestion stands. I'm not questioning your experience, just relaying mine. -m -- ## Mark T. Dame ## CP-ASEL, AGI ## insert tail number here ## KHAO, KISZ "Small software companies are always cool." -- Bill Gates |
#29
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preparing for commercial oral and practical
Now, as Jose pointed out, on the Arrow it's not very significant
Actually I wasn't implying (half an inch) that it wasn't very significant - when the CG range is only a handful of inches, it's significant. And certainly when you're near the edge it bears watching. Jose -- Quantum Mechanics is like this: God =does= play dice with the universe, except there's no God, and there's no dice. And maybe there's no universe. for Email, make the obvious change in the address. |
#30
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preparing for commercial oral and practical
Jose wrote:
Now, as Jose pointed out, on the Arrow it's not very significant Actually I wasn't implying (half an inch) that it wasn't very significant - when the CG range is only a handful of inches, it's significant. And certainly when you're near the edge it bears watching. At the risk of arguing semantics, I wasn't saying "insignificant" only "not very significant". I don't have my Arrow book here, but I believe the CG range is around 10 to 12 inches. If you load well within the envelope, the half inch is not going to have an appreciable affect on aircraft performance. But I'm getting off topic: what should someone expect on their commercial checkride. Make sure to do a W&B for gear up and gear down with takeoff fuel and landing fuel. If the examiner doesn't care, then no big deal, but if the examiner wants to see it and you didn't do it, then you have a strike against you. On checkrides, you'll get plenty of strikes without creating ones that could be easily avoided by a little bit of prep work. Even if the examiner doesn't want or expect it, it can't hurt to have it (unless you do it wrong). -m -- ## Mark T. Dame ## CP-ASEL, AGI ## insert tail number here ## KHAO, KISZ "The way to make a small fortune in the commodities market is to start with a large fortune." -- Unknown |
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