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Search: Posts Made By: Obi Offiah
Showing results 1 to 35 of 71
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Forum: Military Aviation
13th Feb 2012, 20:51
Replies: 26
Views: 5,461
Posted By Obi Offiah

This is why the high alpha passes witnessed at...

This is why the high alpha passes witnessed at airshows, are flown with the pilot applying back pressure to the stick.
Forum: Tech Log
11th Jun 2011, 06:36
Replies: 29
Views: 6,186
Posted By Obi Offiah

This is an interesting topic which has been...

This is an interesting topic which has been discussed before, so the following link may help: http://www.pprune.org/tech-log/376881-technical-alternatives-pitot-tubes.html
Also apparently OADSs are...
Forum: Tech Log
23rd Oct 2010, 11:11
Replies: 17
Views: 6,903
Posted By Obi Offiah

M2dude, yes, please post the diagrams if you...

M2dude, yes, please post the diagrams if you can.:ok:

With the case I mentioned earlier, ignition occured around 8 seconds after AB was selected and stable burning took around 17 seconds due to...
Forum: Tech Log
23rd Oct 2010, 09:45
Replies: 17
Views: 6,903
Posted By Obi Offiah

Intruder: I appreciate your explaination,...

Intruder:

I appreciate your explaination, but what I don't understand is what occurs in the time period from 'no light' to ignition. If the high altitude region is less than optimum, in the...
Forum: Tech Log
22nd Oct 2010, 18:05
Replies: 17
Views: 6,903
Posted By Obi Offiah

Question Afterburner Ignition Delays at Altitude

Last year I read through a document from the early 50's about the characteristics of starting an afterburner at altitude. What I
can't understand is why it generally takes longer for AB light-off...
Forum: Tech Log
15th Sep 2010, 15:59
Replies: 10
Views: 2,957
Posted By Obi Offiah

Question Assuming an aircraft flies into a head wind, it's...

Assuming an aircraft flies into a head wind, it's airspeed will increase but it will actually be decelerating. Does this pose any problems for any of the aircrafts systems?
Forum: Tech Log
15th Sep 2010, 10:30
Replies: 52
Views: 14,243
Posted By Obi Offiah

Question Was this during or after the re-alignment?

Was this during or after the re-alignment?
Forum: Military Aviation
12th May 2010, 16:18
Replies: 17
Views: 4,242
Posted By Obi Offiah

F-15 Streak Eagle Records: Part 1 YouTube -...

F-15 Streak Eagle Records:

Part 1 YouTube - F-15 Streak Eagle Record Flights Part 1 (http://www.youtube.com/watch?v=HLka4GoUbLo)

Part 2 YouTube - F-15 Streak Eagle Record Flights part 2...
Forum: Military Aviation
12th May 2010, 15:47
Replies: 41
Views: 30,872
Posted By Obi Offiah

Thanks cessnapete. I had completely...

Thanks cessnapete.

I had completely forgotten about this thread.:ugh:

My only critique of the Rafale article, was is that there is very little information given about the rafale FCS and what...
Forum: Military Aviation
14th Mar 2010, 04:35
Replies: 41
Views: 30,872
Posted By Obi Offiah

That's a real shame. He has already stated that...

That's a real shame. He has already stated that the Rafale has the best and the Mirage the second best FCS of any aircraft he has flown to date. It would be nice to see how the Eurofighter stacks...
Forum: Military Aviation
10th Mar 2010, 17:14
Replies: 41
Views: 30,872
Posted By Obi Offiah

Peter Collins and the Eurofighter Typhoon?

Does anyone know if Peter Collins has flown the Eurofighter Typhoon? I ask because he has previously been very impressed with the Mirage 2000 Flight Control System and has said that that of the...
Forum: Tech Log
19th Sep 2009, 00:09
Replies: 6
Views: 6,583
Posted By Obi Offiah

Thanks :ok:

Thanks :ok:
Forum: Tech Log
14th Sep 2009, 17:06
Replies: 6
Views: 6,583
Posted By Obi Offiah

Question Geared Turbofan & Contra Rotating Turbofan

Does anyone know if the ratio between the fan and LPT will remain fixed? I ask because if not there may need to be another indication on the engine format e.g Fan, N1, N2

Also with SNECMA's...
Forum: Tech Log
13th Aug 2009, 20:57
Replies: 37
Views: 6,628
Posted By Obi Offiah

I've just discovered the following video on...

I've just discovered the following video on youtube. Its from the external camera in the vertical fin of a B-777, showing the turbine glow from both GE90 engines: YouTube - GE90-115B...
Forum: Tech Log
10th Aug 2009, 21:18
Replies: 6
Views: 5,838
Posted By Obi Offiah

Thanks One Outsider.:ok:

Thanks One Outsider.:ok:
Forum: Tech Log
10th Aug 2009, 19:22
Replies: 6
Views: 5,838
Posted By Obi Offiah

B-HKD, I already have that image. I am looking...

B-HKD, I already have that image. I am looking for a rear view of the combustor, preferably a real photo but a diagram should suffice. Thanks all the same.

I've found out that the fuel nozzle...
Forum: Tech Log
9th Aug 2009, 21:09
Replies: 6
Views: 5,838
Posted By Obi Offiah

CF6 Fuel Nozzles

I understand that the CF6 has 30 fuel nozzles feeding the combustor. Isn't this an unusally high number and would it have anything to do with the fuel nozzle switching/scheduling the engine...
Forum: Tech Log
6th Jul 2009, 13:02
Replies: 37
Views: 6,628
Posted By Obi Offiah

Ok, I've done a bit more searching (thank you...

Ok, I've done a bit more searching (thank you Google) and it seems that two reasons for the pulsing are that its a method of controlling the combustor/turbine temperature as 18-Wheeler mentioned. ...
Forum: Tech Log
5th Jul 2009, 00:41
Replies: 37
Views: 6,628
Posted By Obi Offiah

Cheers.:ok: I won't pretend to know...

Cheers.:ok:



I won't pretend to know anything about fuel injection, is there a particular reason why the fuel is pulsed into the combustor?

Obi
Forum: Tech Log
4th Jul 2009, 18:18
Replies: 37
Views: 6,628
Posted By Obi Offiah

Nice video.:ok: Have you seen this one: ...

Nice video.:ok:

Have you seen this one: YouTube - TNA Metro Startup (http://www.youtube.com/watch?v=pvws8az8rok)
In both videos after combustor ignition the turbine wheel begins to pulse for...
Forum: Tech Log
4th Jul 2009, 16:47
Replies: 37
Views: 6,628
Posted By Obi Offiah

On occasion there is are small licks of flame...

On occasion there is are small licks of flame around the turbine wheel, but your correct it is mainly a red hot glow.
Forum: Tech Log
3rd Jul 2009, 19:22
Replies: 37
Views: 6,628
Posted By Obi Offiah

Thumbs up Hmmm....so there must be some other factor at...

Hmmm....so there must be some other factor at play here, because sometimes you can get very similar lighting conditions and view the engine/s from a very similar angle yet not witness a glow.
...
Forum: Tech Log
3rd Jul 2009, 19:08
Replies: 37
Views: 6,628
Posted By Obi Offiah

Hi Will The VEN variable area nozzle/Iris has...

Hi Will
The VEN variable area nozzle/Iris has an area that varies depending on throttle settings, flight conditions, atmospheric conditions and engine condition. Generally speaking the nozzles are...
Forum: Tech Log
2nd Jul 2009, 20:57
Replies: 37
Views: 6,628
Posted By Obi Offiah

:ok: cheers, I'm starting to think the same. ...

:ok: cheers, I'm starting to think the same. Also it could be that visually it is very sensitive to ambient lighting which has a huge impact on the appearance of the flame, perhaps a little like how...
Forum: Tech Log
2nd Jul 2009, 20:32
Replies: 37
Views: 6,628
Posted By Obi Offiah

No problem :ok: I'm pretty sure this it...

No problem :ok:


I'm pretty sure this it is not an afterburner flame because firstly it is too deep within the bypass duct, i.e upstream of the spraybars. Secondly for a carrier launch...
Forum: Tech Log
2nd Jul 2009, 17:40
Replies: 37
Views: 6,628
Posted By Obi Offiah

No no 18-Wheeler thats pretty interesting. You...

No no 18-Wheeler thats pretty interesting. You mentioned that you observed this in the morning, under what sort of lighting, was it low light or dim conditions?
Forum: Tech Log
1st Jul 2009, 22:01
Replies: 37
Views: 6,628
Posted By Obi Offiah

Question Visible Turbine Glow/Flames

I was just wondering, under what circumstances are flames visible (from the rear end of course) around the turbine blades, excluding turbine fires?

This video shows a centrifugal jet with visible...
Forum: Tech Log
1st Jul 2009, 10:33
Replies: 125
Views: 45,929
Posted By Obi Offiah

Michigan Aerospace: "Pitot Probe/Static...

Michigan Aerospace:
"Pitot Probe/Static Ports/Alpha Sensors are used on the F-16, F-18, and the F-117. Flush Port Sensors are used on the X-15, Space Shuttle (SEADS Experiment), B-2, and the A-12. A...
Forum: Tech Log
12th Jun 2009, 18:41
Replies: 125
Views: 45,929
Posted By Obi Offiah

Some of the later probes such as the SmartProbe...

Some of the later probes such as the SmartProbe by Goodrich, don't require pneumatic lines or plumbing so there is less chance of a blockage....
Forum: Tech Log
10th Jun 2009, 14:53
Replies: 125
Views: 45,929
Posted By Obi Offiah

Hi Dont hang Up There are laser devices...

Hi Dont hang Up

There are laser devices that can provide air data in clean air, without the presence of particulate matter in the atmosphere. I think these are perhaps cutting edge technologies?...
Forum: Tech Log
9th Jun 2009, 20:11
Replies: 125
Views: 45,929
Posted By Obi Offiah

LOL. Dani I don't no whats happening, but I...

LOL. Dani I don't no whats happening, but I can't seem to type laser with an 'a' on this board for some reason.
Forum: Tech Log
9th Jun 2009, 18:54
Replies: 125
Views: 45,929
Posted By Obi Offiah

Optical Air Data Systems

I actually did some research (layman research) on air data systems a few months ago and discovered that laser based optical air data systems had been developed.

Here are a few interesting links:...
Forum: Tech Log
10th Apr 2009, 08:46
Replies: 8
Views: 2,556
Posted By Obi Offiah

Thanks :ok: Obi

Thanks :ok:

Obi
Forum: Tech Log
7th Apr 2009, 11:50
Replies: 8
Views: 2,556
Posted By Obi Offiah

Question Hi, flash8 Any news on that paper? Obi

Hi, flash8

Any news on that paper?

Obi
Forum: Tech Log
2nd Apr 2009, 21:42
Replies: 8
Views: 2,556
Posted By Obi Offiah

No problem lomapaseo, I'm sure the maintenance...

No problem lomapaseo, I'm sure the maintenance pubs make for interesting reading.

Obi
Showing results 1 to 35 of 71
 
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