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by dlednicer
Sun Aug 23, 2020 7:13 pm
Forum: Technical/Operations
Topic: 747-200F with blended winglets.
Replies: 18
Views: 2518

Re: 747-200F with blended winglets.

https://img.geocaching.com/waymarking/d ... 80b753.jpg
(I worked on the program)
-->

One of the remaining 747-200 proof of concept winglets is on display out front of the Museum of Flight in Seattle: https://img.geocaching.com/waymarking/d ... 80b753.jpg
(I worked on the program)

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by dlednicer
Fri Jul 31, 2020 4:20 am
Forum: Technical/Operations
Topic: 737 MAX Upper Fuselage Antennas
Replies: 6
Views: 1832

Re: 737 MAX Upper Fuselage Antennas

The picture of the United 737-9 MAX seen above shows it carrying a Boeing Tri-band Radome. Its 92.4 inches long, 11 inches high and 42.3 inches wide. Different antennas can be put below it. Gimbaled antennas are installed below it (in contrast to the semi-phased arrays used with the Gogo 2Ku). The a...

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by dlednicer
Mon Jul 13, 2020 1:51 am
Forum: Technical/Operations
Topic: 737 MAX Upper Fuselage Antennas
Replies: 6
Views: 1832

Re: 737 MAX Upper Fuselage Antennas

The only satcom radome available for line fit on the 737MAX is the Boeing Tri-band Radome. As Boeing notes "Sized to fit a wide range of Ku and Ka antennas from Panasonic, Honeywell, ViaSat, Global Eagle Entertainment (TECOM), and others."

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by dlednicer
Mon Jun 22, 2020 12:45 am
Forum: Technical/Operations
Topic: Fokker 60 questions
Replies: 5
Views: 2678

Re: Fokker 60 questions

The Fokker F60 was officially the Model 0604. It was originally civil-certified under DGAC Type Certificate T-050-87. Upon the creation of EASA, this became EASA TCDS EASA.A.036. In addition, the F60 was military-certified in the Netherlands under KLu TCDS Number 4.

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by dlednicer
Sat Apr 04, 2020 6:22 am
Forum: Technical/Operations
Topic: A320 antenna locations
Replies: 9
Views: 1084

Re: A320 antenna locations

2 is the LiveTV satcom dome containing a TV downlink antenna. These have now all been replaced on the JetBlue aircraft with the FlyFi domes that cover the TV downlink antenna and broadband uplink/downlink antenna. Also, you don't have them marked, but there are two ADF antennas ahead of the satcom d...

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by dlednicer
Thu Nov 21, 2019 1:37 am
Forum: Technical/Operations
Topic: L1011 Question About a Small Detail
Replies: 31
Views: 4178

Re: L1011 Question About a Small Detail

When you have a protrusion sticking straight up out of a surface over which air flows, an interference vortex called a "horseshoe vortex" will form around the base of that protrusion. http://3.bp.blogspot.com/-YXJa6cxzjj8/Ty1w7vk5EII/AAAAAAAACb0/lINS1vmhfUQ/s1600/Horseshoe-vortex.jpg The ...

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by dlednicer
Mon Jul 29, 2019 8:28 pm
Forum: Military Aviation & Space Flight
Topic: The C5 nosewheel
Replies: 28
Views: 5760

Re: The C5 nosewheel

I bought a copy of the SAE paper. It indicates that the nose gear just rotates as a unit. However, the aft main gear bogies also steer, at 1/3 of the nose gear angle.

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by dlednicer
Tue Jul 23, 2019 5:49 pm
Forum: Technical/Operations
Topic: Solar batteries on airliner skin
Replies: 27
Views: 3126

Re: Solar batteries on airliner skin

The fuselage skin has to be accessible for periodic inspections. Every time someone does a skin inspection, they would have to peel them off.

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by dlednicer
Sat Jun 08, 2019 11:48 pm
Forum: Technical/Operations
Topic: On Flight Internet System / Turboprop
Replies: 6
Views: 2079

Re: On Flight Internet System / Turboprop

I’m not sure about what providers there are. However, it should work, as there’s still internet on jets at low altitude. Also, can a Q400 for example be retrofitted with a receiver by cutting a hole in the top of the fuselage to mount the receiver? Air-to-satellite (ATS) systems are not installed b...

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by dlednicer
Sun Feb 24, 2019 11:35 pm
Forum: Technical/Operations
Topic: Identifying Aircraft with Hushkit Installed
Replies: 9
Views: 1789

Re: Identifying Aircraft with Hushkit Installed

There were at least three 707 hushkit types: 1. Long-duct nacelle (N88ZL) 2. Comtran v1 with longer bypass duct, original intake (N707JT, VH-XBA) 3. Comtran v2: longer intake and bypass duct (on many 320C versions in the 90s) N88ZL has the Burbank Aeronautical/Quiet Skies hush kit for the 707. On t...

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by dlednicer
Sun Feb 24, 2019 11:15 pm
Forum: Technical/Operations
Topic: Evolution in airliners' nose shape
Replies: 10
Views: 2772

Re: Evolution in airliners' nose shape

Boeing engineers laid out the rationale for the design of the 787 nose in AIAA paper 2005-0422 "Optimizing Flight Deck Noise". The started with the knowledge that minimizing the flow velocity over the cockpit windows reduces cockpit noise. Then, they shaped the nose accordingly, to both re...

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by dlednicer
Mon Dec 31, 2018 9:59 pm
Forum: Technical/Operations
Topic: Air Pressure Adjacent to Fuselage Side and Tail Cone
Replies: 11
Views: 2607

Re: Air Pressure Adjacent to Fuselage Side and Tail Cone

As 747Whale said, its very complicated. The fuselage nose shape causes the flow to accelerate, but then it slows down aft of this. Over the wing, the flow is accelerated again, and then slows down again. Here are CFD pictures of the calculated pressure distribution on a 737-700 at cruise conditions....

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by dlednicer
Sun Nov 18, 2018 10:46 pm
Forum: Technical/Operations
Topic: Cessna Caravan 208B CAD
Replies: 1
Views: 2358

Re: Cessna Caravan 208B CAD

You are looking for a valuable commodity. I paid to have a CAD model of the outside surfaces of a 208B built from a laser scan and it cost $30k. Models of the internal structure are even more expensive to acquire. We scanned all of the internal structure of a GIV wing (using a wing from a scrapped a...

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by dlednicer
Tue Oct 09, 2018 2:31 am
Forum: Military Aviation & Space Flight
Topic: Imperial Iranian Air Force, pre revolution
Replies: 19
Views: 4989

Re: Imperial Iranian Air Force, pre revolution

747-2J9F cn 21668/ln 400 was being built for the IIAF when the revolution happened. It was stored, mostly-completed at Paine Field (I saw it there in 1983). In 1986 it was modified to a civil configuration and sold to Northwest Airlines. A friend of mine, who has flown it, tells me that it had an od...

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by dlednicer
Tue Sep 18, 2018 4:11 am
Forum: Technical/Operations
Topic: Engine over the fuselage question
Replies: 38
Views: 3468

Re: Engine over the fuselage question

> The Hondajet is an example of over the wing. No other business jet does this. The Scaled Composites Triumph also had an over-the-wing engine installation. It was also the first airplane to fly with FJ44 engines. I did the aero design of the nacelle installation and will say that it wasn't easy. 17...

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by dlednicer
Tue Sep 18, 2018 4:05 am
Forum: Technical/Operations
Topic: 732 Engine Addition
Replies: 12
Views: 1864

Re: 732 Engine Addition

Those are the original Nordam hushkits. As they added a drag decrement, a completely internal mixer hushkit was later developed.

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by dlednicer
Sat Aug 11, 2018 4:09 am
Forum: Technical/Operations
Topic: Clmax prediction at high cruise Mach (are you geek enough?)
Replies: 6
Views: 1053

Re: Clmax prediction at high cruise Mach (are you geek enough?)

Get a copy of Fred Obert's book "Aerodynamic Design of Transport Aircraft"

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by dlednicer
Fri Feb 23, 2018 5:26 am
Forum: Military Aviation & Space Flight
Topic: SpaceX - Tests, Launches, Developments
Replies: 2083
Views: 295015

Re: SpaceX - Tests, Launches, Developments

I'm joining this conversation rather late, so I apologize if someone has already commented on this. It was not commented on much, but this morning's launch out of Vandenberg AFB, besides carrying the Spanish Paz satellite, also carried SpaceX's Microsat-2a and Microsat-2b prototypes. The plan is to ...

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by dlednicer
Fri Feb 23, 2018 5:05 am
Forum: Technical/Operations
Topic: 747-200 wing vs -300 wing
Replies: 12
Views: 2306

Re: 747-200 wing vs -300 wing

The 747-200 and -300 wings have common OMLs. This is some information that Boeing published in an AIAA technical paper; It shows that the extended upper hump of the 747-300 and 747-400 improves the transonic area ruling of the aircraft. This increases the drag divergence Mach number of the aircraft....

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by dlednicer
Sun Feb 11, 2018 6:08 am
Forum: Technical/Operations
Topic: 737 MAX differences
Replies: 10
Views: 2959

Re: 737 MAX differences

APU inlet and exhaust are visually different. Split winglets. Engines of course. Many have a SATCOM dome on top. Most of the SATCOM atenna thee days are flush mounted.An example would be the BALL SATCOM on Trumps 757 which is slightly aft of the 1L and 2L doors, Hard to see, but its there. I think ...

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by dlednicer
Sun Dec 03, 2017 3:39 am
Forum: Military Aviation & Space Flight
Topic: B-52's In Vietnam, How Many Were Lost
Replies: 25
Views: 60041

Re: B-52's In Vietnam, How Many Were Lost

I've been to the B-52 Victory Museum and the nearby Hồ Bảy Gian. Here is a picture of the wreckage in the lake

Image

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by dlednicer
Sun Oct 15, 2017 6:30 am
Forum: Technical/Operations
Topic: Airfoils horizontal and vertical stabilizers DC-4 C-54
Replies: 2
Views: 1053

Re: Airfoils horizontal and vertical stabilizers DC-4 C-54

Or contact me here!

I am pretty sure that they were designed with NACA 0012 airfoils.

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by dlednicer
Sun Oct 08, 2017 8:29 pm
Forum: Technical/Operations
Topic: Internet in Flight / KA vs KU Band
Replies: 4
Views: 1650

Re: Internet in Flight / KA vs KU Band

Ka can provide higher individual bandwidth, but is vulnerable to atmospheric moisture. Right now, there is more total Ku bandwidth available than Ka, but this will change. Connectivity (satellite) providers are: Intelsat Ku and Ka Eutelsat Ku and Ka Hughes Ku and Ka SES Ku Inmarsat Ka Viasat Ka Tele...

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by dlednicer
Sun Sep 03, 2017 11:27 pm
Forum: Technical/Operations
Topic: WiFi Fuselage Top Casing- Fuel Penalty?
Replies: 15
Views: 3488

Re: WiFi Fuselage Top Casing- Fuel Penalty?

I believe the location of the blister is defined by where it can ideally benefit from Area Rule. If there is a location along the roof where there's an optimum place then that's where it goes, where the dimensions of the body are such that adding the blister does the most good for this. No. There i...

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by dlednicer
Sat Jul 22, 2017 12:56 am
Forum: Technical/Operations
Topic: High Altitude Sickness v Cabin Altitude
Replies: 10
Views: 1281

Re: High Altitude Sickness v Cabin Altitude

I used to get altitude sickness on airliners. Now, I drink coffee before and on a flight and don't have the problem. Thanks to the drug Diomox, I have spent extensive time on the ground at high altitudes (above 8,000 feet), without many problems. On one trip, we spent a week at 12,000 feet and above...

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by dlednicer
Wed May 24, 2017 11:03 pm
Forum: Technical/Operations
Topic: 737-8 MAX Vmo
Replies: 1
Views: 965

737-8 MAX Vmo

The Vmo/Mmo of the 737-8 MAX is listed on the Revision 58 of the A16WE Type Certificate Data Sheet as "VMO/MMO - 270 KCAS/0.82M for extension, 320 KCAS for extended, 235 KCAS for retraction of gear)." Does anyone know: is the Vmo/Mmo for the MAX truly 270/.82? Or, are these gear extension ...

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by dlednicer
Sun Mar 26, 2017 5:09 pm
Forum: Technical/Operations
Topic: Lift to Drag ratios at Take-off, Cruise and Landing for A320
Replies: 16
Views: 5176

Re: Lift to Drag ratios at Take-off, Cruise and Landing for A320

There is a whole chapter on this in Fred Obert's book "Aerodynamic Design of Transport Aircraft"

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by dlednicer
Tue Mar 07, 2017 6:44 am
Forum: Technical/Operations
Topic: DC-9 "Emergency Escape Chute" Deployment? Thoughts?
Replies: 4
Views: 1679

Re: DC-9 "Emergency Escape Chute" Deployment? Thoughts?

As flight testing involves much higher risk than normal operations, emergency egress is provided for the crew. This has been used several times. In the deep stall accident during flight testing of the Canadair CL600 Challenger on April 3rd 1980, two of the three crew members were able to bailout via...

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by dlednicer
Tue Mar 07, 2017 6:32 am
Forum: Technical/Operations
Topic: Aircraft Type Certification
Replies: 9
Views: 1743

Re: Aircraft Type Certification

The type cert covers pretty much the entire plane. Any major mods require a STC. An example is the hush kit mods that were done on the 727. Some changed the engine nacelles and thrust reverser configs which required an STC for all the changes. Another version changed the number 1 and 3 motors to a ...

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by dlednicer
Sat Feb 18, 2017 10:56 pm
Forum: Technical/Operations
Topic: How are differently placed tail rotors able to counter Angular Momentum?
Replies: 8
Views: 1450

Re: How are differently placed tail rotors able to counter Angular Momentum?

Research has shown that the optimal tail rotor configuration is a "pusher" tail rotor with the rotation set up with the bottom blade advancing in the forward direction. This results in the blade slicing up through the main rotor wake. The rotation direction is very important and resulted i...

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by dlednicer
Sat Sep 10, 2016 11:33 pm
Forum: Civil Aviation
Topic: True Max Speed Of 747/VC25
Replies: 21
Views: 7479

Re: True Max Speed Of 747/VC25

According to the FAA Type Certificate Data Sheet, Mmo of the 747-200 is M=0.92. As it is an older, pre-amendment 25-91 airframe, you can figure that Mdive is 0.05 greater (M=.97).

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by dlednicer
Sat May 28, 2016 5:29 pm
Forum: Technical/Operations
Topic: WiFi Antenna Fuel Burn Penalty?
Replies: 26
Views: 8721

RE: WiFi Antenna Fuel Burn Penalty?

The fuel burn penalty for installing a satcom radome on an airliner is usually less than 1%. The actual value depends on which radome, which airplane its installed on and where it is installed on that airplane.

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by dlednicer
Sun May 15, 2016 6:28 pm
Forum: Technical/Operations
Topic: Boeing 707 With "tail-mounted Engine? It Existed!
Replies: 11
Views: 5912

RE: Boeing 707 With "tail-mounted Engine? It Existed!

There were two 5-engine Boeing 299Zs built - one for Pratt & Whitney and one for Curtiss Wright. The P&W example was later "Liberty Belle", which burned out after a crash landing in 2011. The <acronym title="Air Marshall Islands">CW</acronym> example later became a water bomber and was lost ...

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by dlednicer
Thu May 05, 2016 1:27 am
Forum: Technical/Operations
Topic: What Purpose Does This Frontal Fin Serve On MD-88?
Replies: 36
Views: 10609

RE: What Purpose Does This Frontal Fin Serve On MD-88?

Here is the explanation for the strakes, straight from the authoritative source: AIAA paper 85-4067 "Aerodynamic Bugs: Can CFD Spray Them Away?" R. S. Shevell, Stanford University (formerly chief of aero at Douglas Aircraft) DC-9-50 and <acronym title="Air Madagascar">MD</acronym>-80 Fliselage Strak...

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by dlednicer
Sun Dec 13, 2015 8:13 pm
Forum: Aviation Photography
Topic: Spotting And Photography At Kahului (OGG/PHOG)?
Replies: 4
Views: 5128

RE: Spotting And Photography At Kahului (OGG/PHOG)?

Be careful spotting at <acronym title="Kahului (OGG / PHOG), USA - Hawaii">OGG</acronym>. Airports in Hawaii are generally not spotter-friendly. I've been hassled at all of them. I think some of it is the animosity locals have for haoles. I've had several workers give me the typical line that "photo...

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by dlednicer
Mon Oct 26, 2015 5:09 am
Forum: Technical/Operations
Topic: JetBlue Sat. Tv And FlyFi Coverage
Replies: 7
Views: 3086

RE: JetBlue Sat. Tv And FlyFi Coverage

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/ChaosTheory" class="quote" target="_blank">ChaosTheory</a> (<a href="#5" class="quote">Reply 5</a>):<br/><i>nterestingly, <acronym title="JetBlu...

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by dlednicer
Tue Sep 08, 2015 5:42 am
Forum: Technical/Operations
Topic: Wifi/IFE Bubble Provision On New 737 Frame?
Replies: 4
Views: 3603

RE: Wifi/IFE Bubble Provision On New 737 Frame?

Both Panasonic and Row44 (now Global Eagle) satcom radomes are available as line fits on the 737NG.

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by dlednicer
Tue Jul 07, 2015 5:51 pm
Forum: Military Aviation & Space Flight
Topic: ME 262 Restored
Replies: 34
Views: 14275

RE: ME 262 Restored

The J85s on the Legend Flier's replicas are all contained within containers that resemble the outside of a Jumo 004. Thus, if you open the cowl doors, you see what looks like a Jumo 004, but there is a J85 inside of it. BTW: the Messerschmitt Foundation Me 262 replica has CJ610s, not J85s, as they h...

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by dlednicer
Thu Jun 04, 2015 3:36 am
Forum: Technical/Operations
Topic: B727 APU Location
Replies: 36
Views: 10822

RE: B727 APU Location

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/thegman" class="quote" target="_blank">thegman</a> (<a href="#25" class="quote">Reply 25</a>):<br/><i>While we are kinda on topic with 707, the ...

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by dlednicer
Thu May 28, 2015 9:15 pm
Forum: Technical/Operations
Topic: B727 APU Location
Replies: 36
Views: 10822

RE: B727 APU Location

From the AIAA Boeing 727 Design Case Study, Section 3, Design Development of the 727-100 by F.A. Maxam: <table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quote:<br/><i>While this was all going on we were trying to find a...

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by dlednicer
Wed Apr 01, 2015 1:13 am
Forum: Technical/Operations
Topic: Why Is Tooling Destroyed When Lines Close?
Replies: 43
Views: 10767

RE: Why Is Tooling Destroyed When Lines Close?

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/Larshjort" class="quote" target="_blank">Larshjort</a> (<a href="#14" class="quote">Reply 14</a>):<br/><i>The Twin Otter production was restarte...

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by dlednicer
Wed Feb 25, 2015 7:36 am
Forum: Civil Aviation
Topic: Why Did The The Convair 880/990 Fail
Replies: 55
Views: 14669

RE: Why Did The The Convair 880/990 Fail

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/Highflier92660" class="quote" target="_blank">Highflier92660</a> (<a href="#38" class="quote">Reply 38</a>):<br/><i>How fast was the 990? There ...

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by dlednicer
Sat Jan 10, 2015 9:39 pm
Forum: Civil Aviation
Topic: BA 777-236ER Reaches 745 MPH!
Replies: 67
Views: 30084

RE: BA 777-236ER Reaches 745 MPH!

Imagine you were flying in the Concorde, at M=1+ and a fly took off from the galley at the rear of the cabin and flew forward. Relative to the ground, it is traveling at very high speed. Relative to the atmosphere outside the airplane, it is traveling at very high speed. Relative to the air mass it ...

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by dlednicer
Sat Jan 03, 2015 5:49 pm
Forum: Military Aviation & Space Flight
Topic: Skunk Works SR-72 In The Works
Replies: 38
Views: 18299

RE: Skunk Works SR-72 In The Works

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/nomadd22" class="quote" target="_blank">nomadd22</a> (<a href="#33" class="quote">Reply 33</a>):<br/><i>Try reading "Skunk Works" by Ben Rich be...

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by dlednicer
Thu Jan 01, 2015 7:14 am
Forum: Military Aviation & Space Flight
Topic: Skunk Works SR-72 In The Works
Replies: 38
Views: 18299

RE: Skunk Works SR-72 In The Works

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/nomadd22" class="quote" target="_blank">nomadd22</a> (<a href="#22" class="quote">Reply 22</a>):<br/><i>They only got Powers by sending dozens o...

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by dlednicer
Thu Nov 27, 2014 1:57 am
Forum: Military Aviation & Space Flight
Topic: The Xian Y-20 - A Blatant Rip-off?
Replies: 47
Views: 12600

RE: The Xian Y-20 - A Blatant Rip-off?

<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/ThePointblank" class="quote" target="_blank">ThePointblank</a> (<a href="#41" class="quote">Reply 41</a>):<br/><i>Yep. Remember the trouble Unit...

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by dlednicer
Thu Nov 27, 2014 1:36 am
Forum: Technical/Operations
Topic: Learjet 24XR
Replies: 2
Views: 3489

RE: Learjet 24XR

Take a look at US Patent 4,311,289 "Modifications to Jet Aircraft Having Aft Fuselage Mounted Nacelles Overlapping the Wing Assemblies". This shows all the modifications that comprise the XR modification.

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