Crash ([info]crashska) wrote,
2005-08-14 14:49:00
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Multi-engine goodness

Hmmm... gotta get this multi stuff done. Zach has an interview this Thursday, so I need 6 more hours of time in training, a checkride, then several more hours of training for the Instructor rating, a checkride, and finally about 40 more hours of time before being able to give instruction.

That also means it's time to get my concealed carry permit, posthaste, since it takes up to 90 days!

www.packing.org/state/oklahoma/

And as an update to my last entry, Jimmy, your bank angle would decrease as you descend. The density of the air increases as you go down, so your true speed through the air, not the indicated speed you can read in the cockpit, also goes down. Radius of turn is based on bank angle and true airspeed, so to keep the same radius at a lower speed, you need a shallower bank.

Next question: We know Va (Maneuvering Speed) changes with weight, but what about Center of Gravity? As CG moves aft, will Va increase, stay the same, or decrease?

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  • 8 comments

[info]ironpaw

August 14 2005, 12:52:54 UTC 6 years ago

If you set up a class to get your CCW (is sarah going too?) Tell me, and we can all take it together. It's 8 hours, they have one at H&H and it's $60 + ammo.

[info]jimmy_stikx

August 14 2005, 16:44:23 UTC 6 years ago

From what I know of cars, and that a low and central point of gravity make for highly maneuverable cars, that as CG moves aft, towards the rear, assuming from optimal positioning, that VA will decrease, I think. Aircraft aerodynamics aren't my fortey.

[info]crashska

August 14 2005, 19:32:36 UTC 6 years ago

Why would you choose to say it will decrease, though? You need to explain your reasoning to get credit. :)

[info]jimmy_stikx

August 15 2005, 02:46:36 UTC 6 years ago

Okay, well, my reasoning, is that the CG would move back from the main wing area, which if I guess right is were it needs to be for optimal manueverability. So if the CG moves back, you have to put more effeort into the controls to get something to happen, or you could slow down a little bit, to give yourself more time to react, and maybe return the CG forward some to minimize resistance. Or this could all be a load of BS, further proving I have no idea what I'm talking about.

[info]xablor

August 14 2005, 19:36:02 UTC 6 years ago

Am I close?

Some research reveals that it increases, but that's cheating. (For me, at least; I like to figure things out.) Assuming here the maximum designed load, and a front-mounted engine, and using the definition that "Maneuvering Speed is the minimum speed at which the wing can produce lift equal to the design load limit".

So: if lift is the product of the coefficient of lift, wing area, velocity squared, and one-half the air pressure, and assuming a constant air pressure and velocity for all trials, the only other variable is Cl. Ergo, if the required speed decreases, Cl must increase. I hypothesize that this results from a greater angle of attack, resulting from the CG being farther from the center of lift and thus tilting the plane upwards. Yes? No?

[info]xablor

August 14 2005, 19:38:42 UTC 6 years ago

Or was this a private thing? If so, sorry...

[info]sheepdog

August 15 2005, 13:02:37 UTC 6 years ago

My guess would be that it would go up due to the greater inefficiency of the craft being off balance.

Are you required to carry for that position, or is it just for your peace of mind?

[info]crashska

August 17 2005, 04:20:47 UTC 6 years ago

No, it would just be nice to exercise my Constitutional rights before I go to a state that usurps them and "protects" me from myself.

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