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Search: Posts Made By: Nathan Parker
Showing results 1 to 35 of 54
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Forum: Rumours & News
12th Nov 2007, 17:01
Replies: 82
Views: 46,286
Posted By Nathan Parker

Here's a link to an article that IGh mentioned: ...

Here's a link to an article that IGh mentioned:


http://archives.seattletimes.nwsource.com/cgi-bin/texis.cgi/web/vortex/display?slug=1679083&date=19930109
Forum: Rumours & News
11th Nov 2007, 02:32
Replies: 82
Views: 46,286
Posted By Nathan Parker

Thanks, I'll look these up.

Thanks, I'll look these up.
Forum: Rumours & News
11th Nov 2007, 02:29
Replies: 82
Views: 46,286
Posted By Nathan Parker

Thanks, I'll look for it.

Thanks, I'll look for it.
Forum: Rumours & News
9th Nov 2007, 17:30
Replies: 82
Views: 46,286
Posted By Nathan Parker

Thank you sir. Is it generally agreed that the...

Thank you sir. Is it generally agreed that the engines falling off preserved the structural integrity of these airplanes?
Forum: Rumours & News
9th Nov 2007, 15:24
Replies: 82
Views: 46,286
Posted By Nathan Parker

Thank you, I've been reading those threads. ...

Thank you, I've been reading those threads.



That's what I've been wondering. I've found FAA Part 25 regulations which say that the engine mounts must withstand sudden engine stoppages. Any...
Forum: Rumours & News
9th Nov 2007, 14:09
Replies: 82
Views: 46,286
Posted By Nathan Parker

Are there cases where an engine has detached...

Are there cases where an engine has detached solely due to an engine failure?
Forum: Tech Log
30th Oct 2007, 17:13
Replies: 10
Views: 1,502
Posted By Nathan Parker

Yes, thrust and power are different things. For...

Yes, thrust and power are different things. For a jet, thrust is relatively constant with airspeed, but power increases.

For props, assuming a constant speed prop, power is relatively constant...
Forum: Private Flying
29th Oct 2007, 02:25
Replies: 115
Views: 15,299
Posted By Nathan Parker

The existence of turbulence is not a prerequisite...

The existence of turbulence is not a prerequisite for the existence of lift.

Still, your whole criticism is off-target. You're claiming that the difficulty in calculating lift in any particular...
Forum: Private Flying
29th Oct 2007, 02:00
Replies: 115
Views: 15,299
Posted By Nathan Parker

That's what the US Creationists say, as if to...

That's what the US Creationists say, as if to dismiss the theories they don't like! I'd be surprised if you could find a theory well-supported by a century of experimental evidence that was tossed...
Forum: Private Flying
28th Oct 2007, 15:17
Replies: 115
Views: 15,299
Posted By Nathan Parker

I don't buy that at all. Much of the simple...

I don't buy that at all. Much of the simple mathematics gives very accurate results and CFD takes over from that. There isn't much mystery left here.
Forum: Private Flying
28th Oct 2007, 04:20
Replies: 39
Views: 5,993
Posted By Nathan Parker

Ok, I consider that a data point. I'd still...

Ok, I consider that a data point. I'd still prefer to have something technically oriented, rather than pilot training oriented. (The FAA stuff has historically been of dubious accuracy.)

I'm...
Forum: Private Flying
27th Oct 2007, 15:17
Replies: 39
Views: 5,993
Posted By Nathan Parker

Repeating it doesn't make it true. Do you have...

Repeating it doesn't make it true. Do you have any evidence?



The reason we use this approximation is to get an idea of what bank angle will produce a standard rate turn. When you use it, the...
Forum: Private Flying
26th Oct 2007, 15:59
Replies: 39
Views: 5,993
Posted By Nathan Parker

I disagree with this as well. A TC senses yaw...

I disagree with this as well. A TC senses yaw rate; anytime you're getting 3/degrees per sec, it will indicate a standard rate turn.
Forum: Tech Log
25th Oct 2007, 19:43
Replies: 14
Views: 3,225
Posted By Nathan Parker

Thank you. What appears to be the case is...

Thank you.

What appears to be the case is your manuals gave a name to the rule-of-thumb used by aviators everywhere (who use "feet" at least.) The standard lapse rate is about 2C per thousand...
Forum: Tech Log
25th Oct 2007, 14:42
Replies: 25
Views: 4,398
Posted By Nathan Parker

Not currently, but that's supposed to change with...

Not currently, but that's supposed to change with the addition of an additional GPS channel in the 2010-2013 timeframe.
Forum: Tech Log
25th Oct 2007, 13:08
Replies: 14
Views: 3,225
Posted By Nathan Parker

So you say. Please provide evidence.

So you say. Please provide evidence.
Forum: Tech Log
25th Oct 2007, 01:23
Replies: 14
Views: 3,225
Posted By Nathan Parker

I deny that there is any such thing as a "Jet...

I deny that there is any such thing as a "Jet Standard Atmosphere". Google seems to confirm it.:)

There is generally only one standard atmosphere, the US 1976 Standard Atmosphere. The ICAO and...
Forum: Spectators Balcony (Spotters Corner)
24th Oct 2007, 19:30
Replies: 227
Views: 44,119
Posted By Nathan Parker

The airflow ahead of the wing is an upwash,...

The airflow ahead of the wing is an upwash, whereas the flow behind the wing is a downwash. If the engines on the wing are angled at all, they should be pointed slightly down. I haven't noticed if...
Forum: Spectators Balcony (Spotters Corner)
24th Oct 2007, 17:51
Replies: 227
Views: 44,119
Posted By Nathan Parker

Generally aligned with the direction that the air...

Generally aligned with the direction that the air is flowing around the fuselage.
Forum: Tech Log
23rd Oct 2007, 03:44
Replies: 1
Views: 1,106
Posted By Nathan Parker

Can you cite some examples, along with data? The...

Can you cite some examples, along with data? The reverse is more commonly the case.

The accelerated slipstream can indeed increase lift on that wing, which would increase rolling tendencies. ...
Forum: Tech Log
19th Oct 2007, 14:01
Replies: 9
Views: 1,827
Posted By Nathan Parker

I don't know what pitch of the wing means. The...

I don't know what pitch of the wing means. The textbook definition of AOA is the angle between the chordline of the airfoil and the relative wind. The chordline is defined to be the line between...
Forum: Tech Log
18th Oct 2007, 19:42
Replies: 9
Views: 1,827
Posted By Nathan Parker

Good insight!

Good insight!
Forum: Tech Log
18th Oct 2007, 16:39
Replies: 9
Views: 1,827
Posted By Nathan Parker

Most accurate. Since the overall flow of...

Most accurate.

Since the overall flow of the air around the wing is generally parallel to the wing, it’d be tough to argue the aileron has its own AOA.

The deflection of the aileron doesn’t...
Forum: Private Flying
18th Oct 2007, 14:58
Replies: 55
Views: 16,628
Posted By Nathan Parker

Not for airplanes certified by the FAA. V1 must...

Not for airplanes certified by the FAA. V1 must be equal or greater than Vr, and Vr must be greater than Vmc.
Forum: Private Flying
16th Oct 2007, 17:20
Replies: 55
Views: 16,628
Posted By Nathan Parker

Not traditionally, no. The Coffin Corner is...

Not traditionally, no. The Coffin Corner is something else entirely.
Forum: Flight Testing
15th Oct 2007, 14:18
Replies: 8
Views: 2,621
Posted By Nathan Parker

Yes, the existence of a climb requirement depends...

Yes, the existence of a climb requirement depends on Vs0, but the actual rate of climb does not.
Forum: Flight Testing
15th Oct 2007, 14:14
Replies: 8
Views: 2,621
Posted By Nathan Parker

Yes. (Now gotta make the message longer.)

Yes.

(Now gotta make the message longer.)
Forum: Flight Testing
15th Oct 2007, 04:32
Replies: 8
Views: 2,621
Posted By Nathan Parker

That requirement is outdated, from CAR 3. The...

That requirement is outdated, from CAR 3. The current Part 23 climb requirement is not related to the stall speed.
Forum: Flight Testing
13th Oct 2007, 02:49
Replies: 11
Views: 3,543
Posted By Nathan Parker

This is the explanation the inventor of the...

This is the explanation the inventor of the winglets, Richard Whitcomb used.

However, I suspect that once the winglets start generating lift, they change the flow field, so that intensity of the...
Forum: Flight Testing
13th Oct 2007, 02:44
Replies: 11
Views: 3,543
Posted By Nathan Parker

Certainly. Having a reduced net drag, the angle...

Certainly. Having a reduced net drag, the angle of descent will be shallower, which is the identical effect of generating a small amount of thrust. As you say, semantics.

The data I've seen say...
Forum: Flight Testing
12th Oct 2007, 16:26
Replies: 11
Views: 3,543
Posted By Nathan Parker

Everything I've read on winglets say the design...

Everything I've read on winglets say the design is intended to use the vortex to generate thrust in the forward direction. Now, this may have the result of distributing the vorticity more evenly...
Forum: Private Flying
11th Oct 2007, 20:59
Replies: 15
Views: 1,623
Posted By Nathan Parker

The "oversquare" thing is a myth. However,...

The "oversquare" thing is a myth. However, different engines do have different combinations of MP and RPM that are permitted. The Operating Manuals generally do not include these charts, at least...
Forum: Flying Instructors & Examiners
11th Oct 2007, 19:02
Replies: 8
Views: 2,099
Posted By Nathan Parker

Same wing. Sounds like you're confusing...

Same wing. Sounds like you're confusing indicated speeds with calibrated. The R model will have a slightly higher stall speed due to a higher max gross weight and only 30 degrees flaps. Retracting...
Forum: Private Flying
11th Oct 2007, 00:54
Replies: 42
Views: 6,115
Posted By Nathan Parker

Theory says that the speed of minimum power...

Theory says that the speed of minimum power required (best endurance) is .76 * Vldmax. That would put it roughly at 50 knots in a C172R.
Forum: Private Flying
10th Oct 2007, 19:01
Replies: 115
Views: 15,299
Posted By Nathan Parker

Denker doesn't explain very well why the Coanda...

Denker doesn't explain very well why the Coanda Effect isn't involved. I followed up on the reference he gave and the paper doesn't really address the issue. I agree with his conclusion, but mainly...
Showing results 1 to 35 of 54
 
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