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# Search Results

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Forum: Tech Log
16th Nov 2015, 09:39
Replies: 11
Views: 2,307
Posted By blackmail

Hello Pwmdk, 737-300 +winglet :span =...

Hello Pwmdk,
737-300 +winglet :span = 31.11m(non winglet : span = 28.88m). Mac = 3.41m
gross wing surface : S = 105.4m2

aspect ratio = span/mac or span2/S
I let you do the math

have a nice...
6th Dec 2014, 10:44
Replies: 6
Views: 3,083
Posted By blackmail

mach ?

Hello Alex,
there is a formula : EAS = 661xMxroot of greek letter delta
delta= pressure ratio P/Po
at fl100 P= 700hpa(see wx charts)
at sea level Po=1013hpa
700/1013=0,69 => square root= 0,83...
Forum: Tech Log
23rd Jun 2012, 07:34
Replies: 8
Views: 3,645
Posted By blackmail

hello 172 driver, you correct the V1mcg, not the...

hello 172 driver, you correct the V1mcg, not the normal V1.
there is a note in the preamble stating that V1mcg tables are conservative figures for all weight & bleed configurations. so I suppose the...
Forum: Tech Log
19th Apr 2011, 10:51
Replies: 17
Views: 3,145
Posted By blackmail

supersonic aerodynamics

JD,
it might be the formula of Raleigh for supersonic speeds :

Pt-p/p =[ 166,92158M^7/(7M^2-1)^2,5]:cool: -1

Pt = Total Air Pressure
p = Static Air Pressure
M^7 = Mach to the power 7
M^2...
Forum: Tech Log
4th Oct 2010, 18:34
Replies: 6
Views: 5,911
Posted By blackmail

twin otter aft fuel tank

hello firestorm,
good remark about the "holes" of phu & his flapper valves. but i thinks the "holes" makes sense as it ensures a fuel feed to the collector tank(cell 5) from the other cells. assume...
Forum: Tech Log
4th Oct 2010, 16:28
Replies: 6
Views: 5,911
Posted By blackmail

twin otter aft fuel tank

hello phu, the short answer is : pitching moments, gravity & fuel sloshing. the fuel tanks of the twin otter are mounted in tandem in the fuselage & have pitching moments around the center of...
Forum: Tech Log
9th Sep 2010, 10:48
Replies: 4
Views: 5,040
Posted By blackmail

aircraft categories

hello all,

B737-800 is normally cat C aircraft, so cat C minimas apply, except for a circling approach single engine(avoid this, if at all possible), where cat D minimas apply due to higher Vref...
Forum: Tech Log
7th Sep 2010, 18:54
Replies: 10
Views: 1,738
Posted By blackmail

ATPL perfo

hello all,
checking all the different opinions & theories, all correct, there seems to be no consensus on what is the correct answer to this question.
so let's analyse two different scenarios : 1)...
Forum: Tech Log
21st Aug 2010, 18:43
Replies: 19
Views: 4,527
Posted By blackmail

b738 pressure

robin,
it would help, if you try to write correct english, given or taken a few typo's, :rolleyes:
bm,
Forum: Tech Log
21st Aug 2010, 11:18
Replies: 19
Views: 4,527
Posted By blackmail

b738 pressure

robin,
for the last time : flight altitude(not "land" altitude) set on the pressurzation panel, should never be lower than actual flt altitude. if it is, the delta pressure will eventually go up to...
Forum: Tech Log
21st Aug 2010, 05:27
Replies: 19
Views: 4,527
Posted By blackmail

b737 presurization

robin,
it was not. 1) it was not in the QRH. 2) a flight altitude equal to actual altitude would be ok to avoid the unscheduled pressurization caution light, when initiating a descent, but not lower...
Forum: Tech Log
20th Aug 2010, 20:29
Replies: 19
Views: 4,527
Posted By blackmail

b737 presurization

robin,
if you stop the climb of the aircraft, the cabin altitude stops climbing & the delta pressures stops as well.
bm
Forum: Tech Log
18th Aug 2010, 21:03
Replies: 19
Views: 4,527
Posted By blackmail

b737 presurization

hello housecarl,
i would suggest : 1) follow QRH & don't invent new or home made procedures. 2) maybe i'm missing something, but i would think the flight altitude on the pressurization panel should...
Forum: Tech Log
15th Jul 2010, 10:52
Replies: 9
Views: 5,316
Posted By blackmail

Tat & Rat

Hello Studentpilot,

to complete above posts good replies, see following formulae :
assume r = Ram recovery factor, with r equal or less than one(1).
Temperatures (Tt & T) are absolute...
Forum: Tech Log
21st Apr 2010, 09:16
Replies: 10
Views: 2,029
Posted By blackmail

ceilings

hello agus,

keep it simple : any powered aircraft has amongst other things : wings(2) & engine(s), so you have a max. altitude for the wings(aerodynamic ceiling) & a max. altitude for the...
Forum: Questions
19th Apr 2010, 20:08
Replies: 5
Views: 10,074
Posted By blackmail

B738 sweep

hello agus,
sweep angle is all about performance compromise.
increase in sweep angle, increases Mach critical(sonic point on the wing) so allowing increased cruise Mach numbers but the downside is...
Forum: Tech Log
28th Jan 2010, 16:20
Replies: 12
Views: 15,762
Posted By blackmail

cold wx altimeter corrections

hello all,
correction rule for cold wx is : 4 FEET per °C isa deviation per 1000ft OR 1% per 2.5°C isa deviation, both rules give same result.
take FL180 & isa - 10°C gives 4ft x 10 x 18 = 720ft or...
Forum: Questions
14th Jan 2010, 12:22
Replies: 7
Views: 2,036
Posted By blackmail

flight planning

itopalov : jepp charts not maps !
bm.:rolleyes:
Forum: Tech Log
6th Jan 2010, 08:16
Replies: 15
Views: 3,004
Posted By blackmail

bypass ratio

hello all,
the bypass ratio, because it is a ratio or a fraction, by definition has no units.
eg. a bypass ratio(called the greek letter of lambda) of 8, means that for 1 unit of air going through...
Forum: Tech Log
17th Dec 2009, 07:30
Replies: 14
Views: 3,802
Posted By blackmail

b737ng fmc

hello all,

maybe the answer lies in Mr. boeing fcom vol 2. page 11.43.3, april 24, 2009.
descent page.
quote : "Speed restrictions (spd rest) : displays the most restrictive of the following...
Forum: Tech Log
11th Nov 2009, 14:17
Replies: 2
Views: 2,523
Posted By blackmail

acn/pcn

hello all,
nope, jepp is correct, but look the info up in airport directory,
greetings,
bm:):)
Forum: Tech Log
5th Jun 2009, 15:00
Replies: 4,594
Views: 2,724,903
Posted By blackmail

AF447

c.tocross,

4 minutes.
bm.
Forum: Tech Log
24th Feb 2009, 14:50
Replies: 8
Views: 1,316
Posted By blackmail

V1 & N-1

hello every one,

"N-1" is just an old french arithmetic terminology to indicate an engine failure : N=nombre(total number of) de moteurs (engines) "-"=moins(minus) 1(one)moteur (engine). eg a...
Forum: Tech Log
7th Feb 2009, 21:35
Replies: 35
Views: 6,560
Posted By blackmail

cat2&3

hello,
in one of our airfield briefings we have, quote : "during LVP(Low Visibility Procedures), ATIS/TWR will report either cat2 or cat3 in operation according to limiting weather at the time,...
Forum: Tech Log
15th Jul 2008, 13:48
Replies: 19
Views: 4,729
Posted By blackmail

ias vs Mach

hello every one,

there is an easy formula that says it all. but first an assumption : forget the "position error" between ias(indicated airspeed) & eas(equivalent airspeed resulting from pitot...
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