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Search: Posts Made By: WeekendFlyer
Showing results 1 to 35 of 112
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Forum: Biz Jets, Ag Flying, GA etc.
4th Nov 2019, 22:09
Replies: 6
Views: 2,247
Posted By WeekendFlyer

Thanks!

Thank you for the responses, really useful. Sadly my flight won’t include any cocktails but it is with a reputable and long-established operator, so I’m sure it will be fine.
Forum: Biz Jets, Ag Flying, GA etc.
31st Oct 2019, 21:55
Replies: 6
Views: 2,247
Posted By WeekendFlyer

Gulfstream III safety record

I used to fly a lot as part of my job, and happily so. I also had a PPL, now lapsed, and about 500hrs flight time on various types. However, I have found that since having a family my attitude to...
Forum: Rumours & News
12th Mar 2016, 12:15
Replies: 128
Views: 48,639
Posted By WeekendFlyer

Well, there has been some misinformation in this...

Well, there has been some misinformation in this thread! The relevant parts of FAR25 and AC25-20 require than in the event of a worst case rapid depressurisation, the cabin alt must never exceed...
Forum: Tech Log
20th Jul 2015, 17:43
Replies: 34
Views: 25,124
Posted By WeekendFlyer

Climb and descent

In simple terms, climb rate is calculated as follows:

Rate = (Thrust - Drag) x TAS / Weight

Thus to get the best rate you need the highest possible excess thrust (T - D), a high TAS and low...
Forum: Tech Log
2nd Jul 2015, 21:35
Replies: 5
Views: 11,046
Posted By WeekendFlyer

Increasing flight Mach number into the transonic...

Increasing flight Mach number into the transonic range eventually causes small shockwaves to form on the wing, which grow in size as the flight Mach number and/or AOA increase. Google "critical Mach...
Forum: Tech Log
2nd Jul 2015, 21:17
Replies: 30
Views: 10,324
Posted By WeekendFlyer

Let's start at the inlet. If you look closely at...

Let's start at the inlet. If you look closely at any turbofan engine mounted in a nacelle (such as on airliners and business jets) you will see that the inlet area is smaller than the fan area. The...
Forum: Flight Testing
27th Jun 2015, 21:24
Replies: 21
Views: 16,631
Posted By WeekendFlyer

A difficult subject!

Not an easy subject, and one that often creates confusion. I trained at ETPS and have subsequently worked on a number of projects concerning air data systems and one concerning flutter, so hopefully...
Forum: Rumours & News
30th Jun 2014, 14:47
Replies: 47
Views: 20,952
Posted By WeekendFlyer

Can't help but feel for the crew - they were put...

Can't help but feel for the crew - they were put in a very sticky position by ATC, whose vectoring did not seem to take account of the wind and the need to maintain enough distance for final approach...
Forum: Questions
27th Jun 2014, 11:20
Replies: 13
Views: 10,376
Posted By WeekendFlyer

Density and damping

The "fly low" advice comes because damping is affected by altitude, particularly in yaw. Put in very simple terms, the yaw damping comes from the vertical stabiliser moving sideways through the air...
Forum: Questions
27th Jun 2014, 11:14
Replies: 3
Views: 1,726
Posted By WeekendFlyer

Question NATS Animation of transatlantic traffic - and some questions

Have a look at this:

How transatlantic traffic looks from space ? video - BT (http://home.bt.com/news/sciencenews/how-transatlantic-traffic-looks-from-space-video-11363914396839)

It's a nice...
Forum: Tech Log
20th Jun 2014, 09:58
Replies: 10
Views: 6,067
Posted By WeekendFlyer

Thank you

All,

thank you for your very helpful replies, much appreciated. I already had most of the "pieces of the jigsaw", so to speak, but I am now able to put them together in a much more coherent...
Forum: Tech Log
19th Jun 2014, 10:43
Replies: 10
Views: 6,067
Posted By WeekendFlyer

I will take that as a compliment! But visualising...

I will take that as a compliment! But visualising transonic and supersonic airflow is hard without the benefit of considerable experience of working with a supersonic wind tunnel, which I don't have....
Forum: Tech Log
19th Jun 2014, 09:59
Replies: 10
Views: 6,067
Posted By WeekendFlyer

Question Effect of shockwaves on primary flight controls

I understand that once an aircraft exceeds its critical mach number, shockwaves form on the wings and stabilisers and further increases in speed cause the shockwaves to grow and move towards the...
Forum: Tech Log
7th Jun 2014, 20:01
Replies: 5
Views: 6,280
Posted By WeekendFlyer

Pitot-style engine intake above Mach 1

Quick question for any guru-level aerodynamicists or engine intake designers out there. If a subsonic jet engine intake for a high bypass turbofan engine (e.g. as used on most airliners) experiences...
Forum: Tech Log
7th Jun 2014, 19:52
Replies: 15
Views: 3,677
Posted By WeekendFlyer

Just one caution I would add - don't take a 2D...

Just one caution I would add - don't take a 2D aerofoil section lift coefficient and use it directly for a 3D wing. The 2D CL is always higher than the 3D CL, sometime much higher, unless you have an...
Forum: Tech Log
7th Jun 2014, 19:41
Replies: 5
Views: 2,681
Posted By WeekendFlyer

If I recall correctly there are some TAWS alerts...

If I recall correctly there are some TAWS alerts that can trigger on approach, e.g. high sink rate or too much bank angle below a certain height. These may depend on a Radalt input to ensure they are...
Forum: Tech Log
17th Dec 2013, 12:43
Replies: 10
Views: 5,648
Posted By WeekendFlyer

Climb Performance

In simple terms climb performance for shallow climb angles is calculated as follows:

Rate of Climb = [(thrust - drag) x TAS)]/weight

where TAS and ROC have the same units of speed (kt, m/s,...
Forum: Rotorheads
3rd Dec 2013, 14:52
Replies: 109
Views: 42,301
Posted By WeekendFlyer

Hmm, not convinced...

Nice marketing stunt by Amazon. Maybe fun for the comnpany execs to thorw money at, but not convinced it will become reality anytime soon. For UAVs safety is everything; if any possible failure mode...
Forum: Tech Log
18th Nov 2013, 17:28
Replies: 24
Views: 12,637
Posted By WeekendFlyer

Not a runaway stab, but this thread discusses an...

Not a runaway stab, but this thread discusses an incident where FCS law reversion led to the autotrim function being stopped, leaving the stabiliser in the fully nose-up trim position. During the...
Forum: Tech Log
18th Nov 2013, 17:21
Replies: 9
Views: 6,507
Posted By WeekendFlyer

True, but having a dual AOA sensor common failure...

True, but having a dual AOA sensor common failure mode because of water ingress is arguably a system safety weakness; one of the recomendations in the BEA report was aimed at addressing this. I very...
Forum: Tech Log
15th Nov 2013, 14:08
Replies: 9
Views: 6,507
Posted By WeekendFlyer

Lift equation: lift = 0.5 * air density * TAS^2 *...

Lift equation: lift = 0.5 * air density * TAS^2 * wing area * CL

To maintain a lift force from an aerofoil you need to increase CL as speed decreases.Therefore the main wing AOA has to increase as...
Forum: Biz Jets, Ag Flying, GA etc.
12th Nov 2013, 17:12
Replies: 30
Views: 6,637
Posted By WeekendFlyer

All, thanks for replies so far, very useful. Just...

All, thanks for replies so far, very useful. Just wondered if there are any G650 pilots who would be willing to add to the discussion?
Forum: Tech Log
12th Nov 2013, 17:10
Replies: 23
Views: 14,159
Posted By WeekendFlyer

Blade tip speed

LM, no need for that you know! Was just trying to condense a fairly complex bit of theory down to a simple, memorable conclusion for the OP.

Well aware of tip speed limitations, I won't go into it...
Forum: Tech Log
12th Nov 2013, 13:08
Replies: 23
Views: 14,159
Posted By WeekendFlyer

Jet Engine Efffiency

In simple terms, thermal efficiency is derived from the ratio of power out divided by power in. For a jet engine, power out is the rate of change of kinetic energy of the air passing through the...
Forum: Tech Log
12th Nov 2013, 12:53
Replies: 11
Views: 4,359
Posted By WeekendFlyer

Thrust in the Cruise

Easiest way to do a quick estimate is to use the Lift/Drag ratio. In steady level flight (i.e. constant speed, height and direction) Lift = Weight and Thrust = Drag.

Typically, the weight at the...
Forum: Biz Jets, Ag Flying, GA etc.
11th Nov 2013, 16:25
Replies: 30
Views: 6,637
Posted By WeekendFlyer

Cruise Mach for various Business Jets

All,

I was wondering if you could provide me with the cruise mach number and Mmo for the various business jet types that you fly? I understand that some of them are quite a lot faster than typical...
Forum: Flight Testing
1st Nov 2013, 21:36
Replies: 1
Views: 1,451
Posted By WeekendFlyer

Igh, thanks, interesting! I'd forgotten about the...

Igh, thanks, interesting! I'd forgotten about the sonic cruiser but found this:

Analysis of the Sonic Cruiser Concept (http://www.mh-aerotools.de/company/paper_7/astec_2002.htm)

Seems they...
Forum: Military Aviation
1st Nov 2013, 15:50
Replies: 109
Views: 76,824
Posted By WeekendFlyer

Hmm, I suspect the engine design may be...

Hmm, I suspect the engine design may be challenging for that! A Mach 6 airframe is not outside the realms of possibility (it has been done before), but an air-breathing Mach 6 capable engine with a...
Forum: Flight Testing
1st Nov 2013, 15:35
Replies: 1
Views: 1,451
Posted By WeekendFlyer

High Transonic Mach Number cruise

Some of the modern business jets seem to manage very high cruise mach numbers, M0.9 or even slightly above. Does this mean they are cruising at speeds faster then their drag divergence Mach Number...
Forum: Tech Log
1st Nov 2013, 15:17
Replies: 8
Views: 2,068
Posted By WeekendFlyer

I think we need to make careful distinction...

I think we need to make careful distinction between systems here. For example, I doubt anyone would seriously question the usefulness of GPWS or TCAS and their beneficial effect in reducing the...
Forum: Military Aviation
12th Sep 2013, 11:50
Replies: 18
Views: 3,515
Posted By WeekendFlyer

Hmmm...

No disrespect to CAS, his wish list is entirely understandable, but...

"I want aircraft to be faster; to fly higher; to carry more; to stay up in the air longer;"

...is all very well, however:...
Forum: Rumours & News
11th Sep 2013, 12:52
Replies: 93
Views: 46,228
Posted By WeekendFlyer

Just a thought...

I know airbus have produced a runway over-run protection system (ROPS) that compares the aircraft speed and trajectory with that needed to gaurantee a safe stop on the runway.

What about something...
Forum: Private Flying
10th Jul 2013, 14:48
Replies: 9
Views: 2,380
Posted By WeekendFlyer

Possible change in requirements...

It appears that there might be quite a lot more budget available then originally thought. The requirement is now for something more impressive, perhaps a piston twin with retracts and constant speed...
Forum: Private Flying
26th Jun 2013, 15:24
Replies: 9
Views: 2,380
Posted By WeekendFlyer

Help Please - Old aircraft needed for training purposes.

A Further Education college near me teaches aeronautical engineering from BTEC through to degree level and provides training for apprentices. They are extremely keen to get hold of an old aircraft to...
Forum: Tech Log
26th Jun 2013, 09:04
Replies: 22
Views: 29,390
Posted By WeekendFlyer

Natstrack, try this for an explanation and...

Natstrack,

try this for an explanation and the relevant equations:

Machmeter - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Machmeter)


Put simply, the Machmeter does not...
Showing results 1 to 35 of 112
 
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