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Search: Posts Made By: Matthew Parsons
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Forum: Rotorheads
12th Oct 2013, 15:58
Replies: 304
Views: 72,015
Posted By Matthew Parsons

I/C, I'm not sure what your point is. The...

I/C,

I'm not sure what your point is. The first article is about a government process to purchase equipment, the second is about airworthiness certification. Nearly unrelated.

The effort...
Forum: Rotorheads
17th Feb 2013, 15:41
Replies: 4
Views: 2,353
Posted By Matthew Parsons

2. At full throttle setting the engines are N2...

2. At full throttle setting the engines are N2 governed not NR governed. The rotor would be at 103%, #1 N2 at 100% and #2 N2 at 103%.
22nd Nov 2012, 13:50
Replies: 1
Views: 2,853
Posted By Matthew Parsons

Aviation Formulary V1.46...

Aviation Formulary V1.46 (http://williams.best.vwh.net/avform.htm#Mach)
Forum: Rotorheads
28th Oct 2012, 22:14
Replies: 39
Views: 5,101
Posted By Matthew Parsons

"if you're in altitude hold mode, and reduce...

"if you're in altitude hold mode, and reduce power so that you'd go below Vy, it automatically reverts to airspeed hold at Vy. Very nice!"

How is it very nice that an AP that was told to maintain...
Forum: Rotorheads
30th Oct 2011, 14:46
Replies: 13
Views: 1,841
Posted By Matthew Parsons

No. The external shape can have an effect on...

No.

The external shape can have an effect on some stability modes, but the rotors, the fin, and the elevator/horizontal stab are the primary contributors. Streamlining of the external shape is...
Forum: Rotorheads
29th Oct 2011, 16:13
Replies: 69
Views: 11,512
Posted By Matthew Parsons

Some good thoughts here. Of course, the right...

Some good thoughts here. Of course, the right answer is to not put yourself into a bad situation, if you can avoid it.

In general, I think of the autorotation in three phases: entry, sustained,...
Forum: Rotorheads
26th Oct 2011, 00:41
Replies: 96
Views: 29,939
Posted By Matthew Parsons

Keep in mind that mast torque is not the sum of...

Keep in mind that mast torque is not the sum of engine torques. Engine torque includes losses due to driving tail rotor, electrical system, generators, etc. Mast torque is the torque actually...
2nd Aug 2011, 21:37
Replies: 16
Views: 6,103
Posted By Matthew Parsons

HeliTester, I agree with you that OEI HV...

HeliTester,

I agree with you that OEI HV charts for a twin may not be based in completing maneouvre with zero airspeed.

The point I was addressing is that the manoeuvre starts with an airspeed...
1st Aug 2011, 15:27
Replies: 16
Views: 6,103
Posted By Matthew Parsons

Peeush, HV diagrams are based on completing...

Peeush,

HV diagrams are based on completing the landing with 0 GS, but initiating the entry with speed relative to the surrounding air.

Although it may work for very low wind speeds, you...
Forum: Rotorheads
14th Jul 2011, 17:31
Replies: 55
Views: 5,995
Posted By Matthew Parsons

The difference between 46kts & 100' versus 46kts...

The difference between 46kts & 100' versus 46kts & 200' is likely due to increased difficulty in managing rotor speed at the higher height. However, without flying those profiles in that type, I can...
13th Jul 2011, 20:24
Replies: 17
Views: 5,319
Posted By Matthew Parsons

The concern is not whether a backup system can be...

The concern is not whether a backup system can be built, that technology has been out for decades. Rather, it is whether you can assure yourself that a backup system will function and function...
11th Jul 2011, 17:07
Replies: 17
Views: 5,319
Posted By Matthew Parsons

In some ways, testing UAVs is much more difficult...

In some ways, testing UAVs is much more difficult than testing manned aircraft. As far as the raw airframe goes, either is straightforward. Design analysis, structural load measurement, flight...
11th Jul 2011, 16:13
Replies: 4
Views: 2,737
Posted By Matthew Parsons

From a certification testing point of view, I'm...

From a certification testing point of view, I'm not aware of huge savings, but also can't claim much relevant experience. That will change soon as SIL testing is to be a big part of my next few...
Forum: Rotorheads
8th Jun 2011, 04:35
Replies: 29
Views: 11,990
Posted By Matthew Parsons

Does everyone really think the S92 is incredibly...

Does everyone really think the S92 is incredibly unsafe? Yes, the gearbox failed in the worst way. But that's fixed now, isn't it? Would you rather fly a sixty year old proven airframe over large...
Forum: Rotorheads
8th Jun 2011, 04:35
Replies: 293
Views: 64,489
Posted By Matthew Parsons

Does everyone really think the S92 is incredibly...

Does everyone really think the S92 is incredibly unsafe? Yes, the gearbox failed in the worst way. But that's fixed now, isn't it? Would you rather fly a sixty year old proven airframe over large...
Forum: Rotorheads
7th Jun 2011, 03:33
Replies: 32
Views: 12,376
Posted By Matthew Parsons

birddog, Theoretically, any control system...

birddog,

Theoretically, any control system you can imagine is possible. However, once you get into certifying the FBW system you will find some restriction. Imagine looking at a helicopter...
Forum: Rotorheads
5th Jun 2011, 02:45
Replies: 32
Views: 12,376
Posted By Matthew Parsons

The NRC (National Research Council) runs a 205...

The NRC (National Research Council) runs a 205 and a 412 with one pilot FBW, and the other monitoring mechanical flight controls. The aircraft are used for research and development of FBW control...
15th Apr 2011, 16:43
Replies: 2
Views: 1,546
Posted By Matthew Parsons

peeush, I don't see the flight test...

peeush,

I don't see the flight test relevance to your question.

It seems like you're trying to use a normal distribution on measurement errors, by assuming that the maximum range of measurement...
30th Dec 2010, 15:25
Replies: 18
Views: 3,019
Posted By Matthew Parsons

John, Completely agree. I'm not a fan...

John,

Completely agree.

I'm not a fan of simplifying things to enhance understanding at the cost of accuracy. Hence, I'm of the school that we should drop the term "gyroscopic precession" from...
30th Dec 2010, 05:23
Replies: 18
Views: 3,019
Posted By Matthew Parsons

I had the fortune to try and tutor my girlfriend...

I had the fortune to try and tutor my girlfriend (now wife) in Physics when we were undergrads. Learned very quickly that using big words, formulas, and assumptions is a very bad way to illustrate a...
26th Nov 2010, 01:59
Replies: 6
Views: 2,222
Posted By Matthew Parsons

Sounds like "jack stall" or "servo transparency"....

Sounds like "jack stall" or "servo transparency".

Rather than repeating the description, just search the forum. It's been covered many times.
6th Nov 2010, 19:50
Replies: 6
Views: 1,439
Posted By Matthew Parsons

It's all about what level of risk your...

It's all about what level of risk your organization is willing to accept. Flight test is a great risk reduction technique, but there are many more ways to manage risk...acceptance being one of them....
26th Jul 2010, 00:55
Replies: 98
Views: 28,137
Posted By Matthew Parsons

WWW, Thanks for the great read. I think the...

WWW,

Thanks for the great read. I think the orders today are written based on simliar experiences from the past, making it harder for us to go places we just don't want to be.

You said, "The...
Forum: Rotorheads
16th Jul 2010, 13:54
Replies: 18
Views: 2,916
Posted By Matthew Parsons

fly911, Completely agree. The safety part I...

fly911,

Completely agree. The safety part I referred to was during a crash. The comfort part was just physical comfort.

I always use NVG for night flying (absolutely essential for about 70%...
Forum: Rotorheads
12th Jul 2010, 15:52
Replies: 18
Views: 2,916
Posted By Matthew Parsons

Once the system is mature, I can see regulation...

Once the system is mature, I can see regulation catching up to technology and allowing such systems in VFR operations.

I think the field of vision is a concern that is most easily managed through...
Showing results 1 to 25 of 337
 


 
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