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Search: Posts Made By: engine-eer
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Forum: Rotorheads
23rd Jun 2011, 16:13
Replies: 42
Views: 11,651
Posted By engine-eer

Oils with better scorching resistance result in...

Oils with better scorching resistance result in much better performance in this engine. You could make the case that the engine is marginal in this regard, but the fact remains that if you use a...
Forum: Rotorheads
21st Jun 2011, 19:24
Replies: 42
Views: 11,651
Posted By engine-eer

It's turbine INLET temperature that matters, not...

It's turbine INLET temperature that matters, not turbine outlet temperature. The cracks start at the leading edge of the rotor. If the main rotor is taking out work (even though it is in flat pitch...
Forum: Rotorheads
21st Jun 2011, 13:39
Replies: 42
Views: 11,651
Posted By engine-eer

The biggest issue with the 250 is the limited low...

The biggest issue with the 250 is the limited low cycle fatigue life of the turbine wheels.

The wheels are integral castings. That means that the wheel is made up of a disk that is cast in one...
Forum: Rotorheads
20th Jun 2011, 14:05
Replies: 42
Views: 11,651
Posted By engine-eer

All pretty good points. If production was up to a...

All pretty good points. If production was up to a reasonable rate the cost would come down some. While we have a lot better machining technology today, the 250 was made using dedicated machines. That...
Forum: Rotorheads
17th Jun 2011, 15:56
Replies: 42
Views: 11,651
Posted By engine-eer

It can be done, all it takes now is money

Actually the issue is the height of the blade passage as a function of compressor pressure ratio and size. As the engine pressure ratio gets higher, the height of the blade passage gets smaller in...
Forum: Rotorheads
16th Jun 2011, 21:42
Replies: 42
Views: 11,651
Posted By engine-eer

As with any engine there are good points and bad...

As with any engine there are good points and bad points. The RR 250, when properly maintained and flown is a reliable piece.

The good points are that it is well developed and runs just fine.
...
Forum: Tech Log
11th Jun 2011, 13:27
Replies: 4
Views: 6,570
Posted By engine-eer

Sorry about the Mac. Maybe you can find a set of...

Sorry about the Mac. Maybe you can find a set of tables somewhere on the web. I just did a short search and didn't find any. Used to be Allison and Pratt produced a little pocket sized book with...
Forum: Tech Log
10th Jun 2011, 03:46
Replies: 4
Views: 6,570
Posted By engine-eer

Jane, You need a set of mach tables for...

Jane,

You need a set of mach tables for standard atmosphere to calculate the pressure at the compressor face. A proper set of mach tables has the total pressure ratio and total temperature...
Forum: Tech Log
8th Jun 2011, 02:06
Replies: 2,070
Views: 616,223
Posted By engine-eer

Lonewolf, Station 1 is the free stream,...

Lonewolf,

Station 1 is the free stream, PT2 is total pressure at the engine inlet. Total pressure is total pressure, whether you measure it at the engine inlet face or with a pitot tube, so long...
Forum: Tech Log
7th Jun 2011, 20:01
Replies: 2,070
Views: 616,223
Posted By engine-eer

One thing that has bugged me is that the flight...

One thing that has bugged me is that the flight control system very quickly gave up control when it lost airspeed information. In these degraded modes, I can understand dropping off the autopilot,...
Forum: Tech Log
5th Jun 2011, 18:19
Replies: 3,435
Views: 1,674,516
Posted By engine-eer

What the pilot might have felt

If they stalled it at a load factor of less than one g, that would result in a stall at a considerably lower speed. The Airbus Safety newsletter mentioned that buffetting would occurr as the aircraft...
Forum: Tech Log
5th Jun 2011, 02:22
Replies: 3,435
Views: 1,674,516
Posted By engine-eer

Remember in the mid-eighties that a lot of...

Remember in the mid-eighties that a lot of performance cars were going to video display full digital dashboards with no analog gages????

Then the guys actually running cars on the track figured...
Forum: Tech Log
4th Jun 2011, 19:59
Replies: 2,070
Views: 616,223
Posted By engine-eer

I am not questioning the current airworthiness, I...

I am not questioning the current airworthiness, I understand the issue has been addressed. I don't think that the system was airworthy at the time. What I am saying is, if they were known to be...
Forum: Tech Log
4th Jun 2011, 17:31
Replies: 2,070
Views: 616,223
Posted By engine-eer

Lets go back to the start for a minute

While there is a lot of conjecture as to what happened when (and the releases so far don't clear much of it up), it seems nobody is disputing that the airspeed sensors shut down (for whatever reason,...
Forum: Tech Log
2nd Jun 2011, 22:47
Replies: 2,070
Views: 616,223
Posted By engine-eer

Well, yes you could resume flying and generating...

Well, yes you could resume flying and generating lift, but you would be diving at a pretty severe angle and you have to generate enough G to turn the aircraft from that nose down path to horizontal....
Forum: Tech Log
2nd Jun 2011, 21:01
Replies: 2,070
Views: 616,223
Posted By engine-eer

Ok, I get it, he told the airplane to climb and...

Ok, I get it, he told the airplane to climb and it did. In this particular case Direct law would have been better than Alternate law since it wouldn't have trimmed him nose up, but if he hadn't held...
Forum: Tech Log
2nd Jun 2011, 20:29
Replies: 2,070
Views: 616,223
Posted By engine-eer

Airbus control logic and alternate mode control

One problem that I see here with the Airbus approach to degraded mode operation is that the aircraft can be put into a flight mode that is not natural. In normal law the aircraft flies to a point in...
Forum: Tech Log
28th May 2011, 17:05
Replies: 3,435
Views: 1,674,516
Posted By engine-eer

Touch'n'oops Sorry, I confused Alternate...

Touch'n'oops

Sorry, I confused Alternate Law with Direct Law. In direct law autotrim is disabled. That is what occurred in the Air New Zeland crash, where the trim was left at the last autotrim...
Forum: Tech Log
28th May 2011, 16:15
Replies: 3,435
Views: 1,674,516
Posted By engine-eer

Sorry I thought you were referring to this case. ...

Sorry I thought you were referring to this case.

What does it take to have the FC system return to normal law? Does the system do that automatically after it has decided that the AS sensors...
Forum: Tech Log
28th May 2011, 14:06
Replies: 3,435
Views: 1,674,516
Posted By engine-eer

Auto trim is disabled in Alternate law

This is not correct. When the system is in alternate law the auto trim function is disabled. Pushing the stick forward only results in limited elevator motion. Trim must be addressed by the pilot in...
Forum: Biz Jets, Ag Flying, GA etc.
7th Jul 2008, 19:15
Replies: 8
Views: 10,234
Posted By engine-eer

Opinions on the Walter M601

Been looking at the Walter 601 and trying to understand why that engine hasn't been successful in the US.

Ok, it's a little bit heavier (like 20 lbs equipped) than a PT6, and yes it burns a bit...
Showing results 1 to 21 of 21


 
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