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Search: Posts Made By: Owain Glyndwr
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Forum: Tech Log
11th Aug 2011, 18:57
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

Bear, Lyman,RWA or whoever. We know you have...

Bear, Lyman,RWA or whoever.

We know you have difficulty with simple concepts, and I am probably wasting my time, but one more try.

With a FBW airplane operating under C* laws there is no simple...
Forum: Tech Log
1st Aug 2011, 07:22
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

I agree you have to pitch down enough that the...

I agree you have to pitch down enough that the aircraft accelerates. The curves of course only relate to AoA and aircraft trim, but in practice, until the dynamics have sorted themselves out and a...
Forum: Tech Log
31st Jul 2011, 21:41
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

Back to impersonal...

Back to impersonal mattershttp://images.ibsrv.net/ibsrv/res/src:www.pprune.org/get/images/smilies/wink2.gif

There has been a lot of debate on whether the aircraft could have been recovered from...
Forum: Tech Log
16th Jul 2011, 20:40
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

Yes in principle, but I must admit that my...

Yes in principle, but I must admit that my remarks are biased by the curves for a 'typical twin engined aircraft' as shown in that NASA upset recovery report (plus some intuition) which seems to me...
Forum: Tech Log
16th Jul 2011, 20:27
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

Maybe because I was careful not to give a bottom...

Maybe because I was careful not to give a bottom line http://images.ibsrv.net/ibsrv/res/src:www.pprune.org/get/images/smilies/wink2.gif



Certainly not from the altitude at which they seem to...
Forum: Tech Log
16th Jul 2011, 17:59
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

My point was that to maintain 60 deg AoA you need...

My point was that to maintain 60 deg AoA you need a lot of UP elevator, which takes the THS away from stall. Gums curves and the curves in that NASA report on civil aircraft upset recovery (cited in...
Forum: Tech Log
14th Jul 2011, 16:16
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

Gums, The actual requirement is a...

Gums,

The actual requirement is a complicated formula that depends on MTOW, but pretty well all civil airliners this equates to 2.5g as a 'limit' load with a factor of 1.5 to be applied for...
Forum: Tech Log
14th Jul 2011, 15:30
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

Yes that is right I may have...

Yes that is right



I may have misunderstood your numbers, but no, The CG and CoP numbers are % of mean aerodynamic chord, which is about 7.3m. The tail arm, from 37% mac back to the usual...
Forum: Tech Log
14th Jul 2011, 13:23
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

[quote} There seem to be lot of differences,...

[quote} There seem to be lot of differences, AF447 kept more then double the AOA on the way down. [/quote]

Not the least being that AF447 had the THS at -13 all the way down where this model was...
Forum: Tech Log
14th Jul 2011, 12:21
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

As a ‘newbie’ here I have been reluctant to say...

As a ‘newbie’ here I have been reluctant to say too much in the presenc e of so much expertise, but I do think that I may be able to make a positive contribution towards understanding the...
Forum: Tech Log
13th Jul 2011, 11:33
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

If you ignore the slight complication of no-lift...

If you ignore the slight complication of no-lift angles and wing body settings (which change the zero body angle downwash), then lift coefficient is just AoA times lift curve slope, so they move...
Forum: Tech Log
12th Jul 2011, 21:34
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

Now you are just being silly! I...

Now you are just being silly!



I thought that was what I was trying to do, but when the response one gets is similar to that above it seems hardly worth while :ugh:
Forum: Tech Log
12th Jul 2011, 21:09
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

Maybe in your world, not in mine. If you start...

Maybe in your world, not in mine. If you start mixing definitions according to what part of the aircraft you are talking about you can get confused very quickly!

Positive lift is upwards...
Forum: Tech Log
12th Jul 2011, 20:50
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

FPA of 45 degrees is what you get from the BEA...

FPA of 45 degrees is what you get from the BEA stated impact conditions with zero surface wind.

No, if the tail stalls when giving upwards lift the loss of that lift would give a nose up pitch...
Forum: Tech Log
12th Jul 2011, 20:40
Replies: 1,998
Views: 511,019
Posted By Owain Glyndwr

RRT Since you ask .... First...

RRT



Since you ask ....

First thing is that MM43's excellent graphic of THS flow (Thread 4 #1042) is missing one important parameter. A lifting wing, even a stalled wing, produces downwash...
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