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Search: Posts Made By: hawk37
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Forum: Tech Log
5th Jan 2004, 01:23
Replies: 57
Views: 10,445
Posted By hawk37

thanks for your reply Keith. Your quote: ...

thanks for your reply Keith. Your quote:

"The thrust increasing tendency due to ram effect is proportional to TAS squared, while the decreasing effect due to intake drag and reduced acceleration...
Forum: Tech Log
31st Dec 2003, 20:44
Replies: 57
Views: 10,445
Posted By hawk37

Keith, thanks for your insights. I kept drafting...

Keith, thanks for your insights. I kept drafting replies, but my problem is I don’t understand what I read from various internet sources (that’s probably my problem right there). I tried looking up...
Forum: Tech Log
25th Dec 2003, 03:45
Replies: 57
Views: 10,445
Posted By hawk37

Keith, As in my earlier post, the graph is of...

Keith,
As in my earlier post, the graph is of thrust vs mach, at 59 deg F (below the 76 deg F flat rate)
and sea level (US standard atmosphere). So it is as you surmised.
It’s taken awhile for...
Forum: Tech Log
20th Dec 2003, 00:30
Replies: 57
Views: 10,445
Posted By hawk37

Crossunder, this constant thrust" climb, as you...

Crossunder, this constant thrust" climb, as you refer to it as, is actually a best angle climb.
Not sure if it’s considered in the airline world that much, but corporates flying out of some ...
Forum: Tech Log
19th Dec 2003, 03:57
Replies: 57
Views: 10,445
Posted By hawk37

KEITH, Glad to hear that someone agrees my...

KEITH, Glad to hear that someone agrees my original conjecture is true. (Pardon to BOOKWORM, he may have already hinted so too).
I’ve been away, or would have posted earlier.
While I have to agree...
Forum: Tech Log
8th Dec 2003, 08:47
Replies: 57
Views: 10,445
Posted By hawk37

Baron, I don't think this figures are any where...

Baron, I don't think this figures are any where near V min drag. Also, way out of the flat rating
range. And 20% loss in thrust available with a 5 deg C rise sound WAAAAAAY too much. Was that a...
Forum: Tech Log
6th Dec 2003, 20:10
Replies: 57
Views: 10,445
Posted By hawk37

Keith, thanks, and your quote "I think that I can...

Keith, thanks, and your quote "I think that I can see what you are saying, but again you are
starting with a false assumption. Thrust will not remain constant as temperature increases."

I was...
Forum: Tech Log
6th Dec 2003, 03:47
Replies: 57
Views: 10,445
Posted By hawk37

Keith, reference your quote "I think that the...

Keith, reference your quote "I think that the fault in your argument lies in the fact
that the thrust does not remain unchanged as you climb"

I’m talking instantaneous climb gradient,...
Forum: Tech Log
6th Dec 2003, 00:42
Replies: 57
Views: 10,445
Posted By hawk37

Tinstaffl, I didn’t say the climb rate is...

Tinstaffl, I didn’t say the climb rate is unchanged. In my scenario, which is academic, the excess thrust is unchanged, which implies the climb gradient is unchanged, which implies the ROC is...
Forum: Tech Log
5th Dec 2003, 20:14
Replies: 57
Views: 10,445
Posted By hawk37

Wow, Keith, quite the post. You took a...

Wow, Keith, quite the post. You took a tremendous amount of time to write that, an amount of time that will only be surpassed by the number of times I re-read it. I appreciate your efforts.
...
Forum: Tech Log
4th Dec 2003, 21:17
Replies: 57
Views: 10,445
Posted By hawk37

Baron, we’ve been referring to climb at V minimum...

Baron, we’ve been referring to climb at V minimum drag, approximately final segment climb speed,
and with flat rated engines. That’s why I had put the phrase "same conditions". Certainly a...
Forum: Tech Log
4th Dec 2003, 03:13
Replies: 57
Views: 10,445
Posted By hawk37

So, Keith, if I follow, can you confirm then that...

So, Keith, if I follow, can you confirm then that you saying that climb GRADIENT at min drag, flat rated, will decrease (slightly) as temp increases
And if so, then can you make a determination on...
Forum: Tech Log
4th Dec 2003, 00:48
Replies: 57
Views: 10,445
Posted By hawk37

Baron, thanks for the reply ref your quote ...

Baron, thanks for the reply
ref your quote
"Greater groundspeed equals longer take off run, and a greater distance to
achieve the same altitude, which means a reduced angle of climb "

I’ve...
Forum: Tech Log
3rd Dec 2003, 22:25
Replies: 57
Views: 10,445
Posted By hawk37

Baron,you say "The lower the temperature the...

Baron,you say
"The lower the temperature the lower the TAS required for a given CAS, TAS requires thrust. Less thrust required for straight and level means a surplus of thrust."

Not sure what...
Forum: Tech Log
3rd Dec 2003, 21:52
Replies: 57
Views: 10,445
Posted By hawk37

Where's Genghis??

Runaway, thats just my point. Sounds "simple as that", yet the math, the performance manuals, the
aerodynamics etc. tell us the gradient is temperature independent, and that the climb rate
will...
Forum: Tech Log
3rd Dec 2003, 19:04
Replies: 57
Views: 10,445
Posted By hawk37

No fallacy, better climb rate on warm day than cold, at V fs

Further to my original post, an acquaintance has shown me Falcon 50 climb performance that shows at both
V2 and V final segment, the climb gradient DOES NOT vary with temperature, within the flat...
Forum: Tech Log
3rd Dec 2003, 04:13
Replies: 57
Views: 10,445
Posted By hawk37

Cold weather climb performance: fact or fiction?

There seems to be the visual perception that for a jet, the colder the temperature, the greater the climb angle and rate after takeoff. Even if one requires the aircraft to be in the same...
Showing results 1 to 17 of 17


 
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