• Rotorheads and Gas Bags

Okay, this is all off topic, but since we're being silly, you heliwopper pilots listen up.

Take a gander at this: a blimp plus four full size helicopters . . . all hooked together.




The "Helistat" was actually built under a 1980 U.S. Navy contract for the Forest Service to demonstrate the potential of heavy lift for harvesting timber.

Readers are reminded that "stat" is
an abbreviation of the Latin statim, or "immediately", often used in medical contexts, but not particularly apropos here, we think.

The demonstration vehicle was part Navy ZPG-2W blimp (1,000,000 cu. ft.) and most of four H-34J helicopters. At 343 feet, the Helistat was the largest aircraft (using the term loosely) in the world, even bigger than the Hughes flying boat (span 320 ft.)

Here's a bevy of the rotund beauties before they got weird and mated with helicopters.


On the topic of rotund, this one actually looks very cool even if no helicopters are involved—but what the heck does the Customs Service need for heavy lift? Maybe it would carry helicopters? But why?



And then there's this "Rotary Wing System for Booster Recovery," or at least that's what Hiller called this proposed behemoth.



The rotors would have been 400 feet in diameter, the beast's empty weight would have been over 450,000 pounds, and its gross weight would have been about 1,000,000 pounds. Talk about whop-whop-whop! The idea was that it would descend after loiteri9ng for as much as 6 hours from an altitude of 15-20,000 feet, snag the booster's parachutes in mid-air, and bring the spent booster home dangling some 700 feet below.

Any volunteers to fly it?

• A Memorial

I've tried to collect here first person accounts of aviation related experiences. Most are interesting, some are funny, and a few are heroic. This one is simply sad, and I though long and hard before posting it. I have, in the end, as a memorial.

On January 31, 2000, about 1621 Pacific standard time, Alaska Airlines, Inc., flight 261, a McDonnell Douglas MD-83, N963AS, crashed into the Pacific Ocean about 2.7 miles north of Anacapa Island, California.



The 2 pilots, 3 cabin crewmembers, and 83 passengers on board were killed, and the airplane was destroyed by impact forces. Flight 261 was operating as a scheduled international passenger flight under the provisions of 14 Code of Federal Regulations Part 121 from Lic Gustavo Diaz Ordaz International Airport, Puerto Vallarta, Mexico, to Seattle-Tacoma International Airport, Seattle, Washington, with an intermediate stop planned at San Francisco International Airport, San Francisco, California. Visual meteorological conditions prevailed for the flight, which operated on an instrument flight rules flight plan.

After departure, Alaska 261 climbed to FL310. Two hours into the flight, the flight crew contacted Dispatch and Maintenance Control in Seattle, and discussed a jammed elevator and a possible diversion to LAX. The jammed elevator didn't respond to trim changes , so at their altitude and airspeed the pilots had to continuously exert an estimated 10 pound pull to maintain level flight. None in the air or on the ground could determine the cause of the problem.

At 4:09 p.m., the flight crew managed to unjam the horizontal stabilizer with the primary trim system, but it went to full "nose-down" position and force the aircraft in to what the crew reported to ATC as a vertical dive. By exerting an estimated 130 to 140 pounds on the controls they stopped the descent at about FL240, the attempted the check handling in the landing configuiration while over the ocean, and asked to divert to LAX.

video

Beginning at 4:19 p.m., the CVR recorded the sounds of at least four distinct "thumps" (flight bags hitting the overhead?), followed 17 seconds later by an "extremely loud noise". The aircraft rapidly pitched over into a dive. The CVR transcript shows the pilots' continuous attempts for the duration of the dive to regain control of the aircraft. At one point, unable to raise the nose, they even attempted to fly the aircraft inverted. However they couldn't recover, and descended for 1 minute, 21 seconds before impacting the ocean at high speed.

Radio (scanner omits time when there are no transmissions): Alaska Flight 261

Full NTSB report: PDF Document


• Full Tokyo Tanks


Of all the stories that have been written and movies that have been shown about the 8th Air Force, very little attention has been given to what was involved in assembling, in the air, 1200 B-17's and B-24's each day, plus 600-800 fighters to get them in formation to carry out a strike against Germany.


Certainly showing bombers under attack by fighters, or encountering heavy flak, was a reality, and interesting to watch. Also, stories about some of the rougher missions make interesting reading. But what was going on over England, each morning, could be just as scary for the crews as the time spent over some of the targets.

The planning, and coordination, that had to be accomplished during the night, by the operations planners of each Group, so that the crews could be briefed, was unbelievable. If the planners had failed to do their jobs properly, there would have been a free for all among Bomb Groups, in the skies over England.

The rendezvous points, altitude, and times had to be precise, and known by all of the crews, before the Eighth Air Force could get in formation. The success of the planners, in accomplishing their mission, enabled the Eighth Air Force to become the most powerful air armada ever assembled. In my view, how this was accomplished is one of the major untold stories of the war.


I was a pilot in the 95th Bomb Group, in late 1944 and early 1945, and what follows is a typical mission, as I remember it, from a crew member's perspective.

Early in the evening, our Squadron Operations would post the names of the crews that were scheduled to fly the following day. There were two ways we could be notified if the Group had been alerted to fly. One was by means of lights on the front of the orderly room, and the other with raising of colored flags. If a green light was on, the Group was alerted, if a red light was on we would fly, and if a white light was on, the Group would stand down. The light was monitored frequently throughout the evening to learn our status and, normally, we would know before going to bed if we would be flying the next day.

On the morning of a mission, the CQ (charge of quarters) would awaken the crews about four or five o'clock, depending on takeoff time. The questions we always asked were, "What is the fuel load?" and, "What is the bomb load?" If his answer was, " full Tokyo tanks," we knew we would be going deep into Germany. Shortly after being awakened, "6-by" trucks would start shuttling us to the mess hall. We always had all the fresh eggs we could eat, when flying a mission.

After breakfast, the trucks carried us to the briefing room. All of the crew members attended the main briefing, and then the Navigators, Bombardiers and Radio operators went to a specialized briefing. At the main briefing, in addition to the target information--anti-aircraft guns, fighter escort and route in--we received a sheet showing our location in the formation, the call signs for the day and all the information we would need to assemble our Group and get into the bomber stream.


After briefing, we got into our flight gear, drew our parachutes and loaded onto the trucks for a ride to our plane. We were now guided by the time on our daily briefing sheet.
We started engines at a given time and watched for the airplane we would be flying in formation with to taxi past, then we would taxi behind him. We were following strict radio silence.


We were now parked, nose to tail around the perimeter, on both sides of the active runway, and extremely vulnerable to a fighter strafing attack.

At the designated takeoff time, a green flare would be fired and takeoff would begin. Every thirty seconds an airplane started takeoff roll. We were lined up on the perimeter so that the 12 airplanes of the high squadron would take off first, followed by the lead and then the low squadron.


Each Group had a pattern for the airplanes to fly during climb to assembly altitude. Some would fly a triangle, some a rectangle and our Group flew a circle, using a "Buncher" (a low frequency radio station) which was located on our station. The patterns for each Group fit together like a jig saw puzzle. Unfortunately, strong winds aloft would destroy the integrity of the patterns, and there would be considerable over running of each other's patterns.


Many of our takeoffs were made before daylight, during the winter of '44 and '45, when I was there, so it was not uncommon to climb through several thousand feet of cloud overcast. Also it was not uncommon to experience one or two near misses while climbing through the clouds, although you would never see the other airplane. You knew you had just had a near miss, when suddenly the airplane would shake violently as it hit the prop wash of another plane. It was a wonderful feeling to break out on top, so you could watch for other planes, to keep from running into each other.

To add to the congestion we were creating, the Royal Air Force Lancasters, Halifaxes, and Wimpys would be returning from their night missions, and flying through our formations. Needless to say, pilots had to keep their heads on a swivel and their eyes out of the cockpit.


After take off, the squadron lead would fire a flare every 30 seconds, so that we could keep him located and enable us to get into formation quicker. The color of our Group flare was red-green. The first thing you would see, when breaking out of the clouds, was a sky filled with pyrotechnics, so you had to search the sky for the Group flare, which would identify the lead airplane of your Squadron.


Once you had it located, you could adjust your pattern to climb more quickly into formation with him. As each airplane pulled into formation, they would also fire a flare, with the lead plane, making it much easier for the following aircraft to keep him in sight. I think most crew members would probably agree that the pyrotechnic show, in the skies over England, in the morning when the Eighth was assembling, was a rare sight to behold.

The order of progression for assembling the Eighth Air Force was to first assemble the Flight elements, the Squadrons, the Groups ,the Combat wings, the Divisions and, finally, the Air Force.


As soon as the four Squadron elements were formed, the high, low and second elements would take up their positions on the lead element, to form a Squadron. When the three Squadrons had completed assembly, it was necessary to get into Group formation. This was accomplished by having the three Squadrons arrive over a pre-selected fix at a precise time and heading. The high and low Squadrons were separated from the lead Squadron by 1000 feet and, after getting into Group formation, they would maintain their positions by following the lead Squadron.

click to enlarge

Then it was necessary to get into the Combat Wing formation. We were in the 13th Combat Wing, which consisted of three Bomb Groups: the 95th, the 100th and the 390th . Whichever Group was leading the Wing that day, would arrive over a pre-selected point, at a precise time and heading. Thirty seconds later, the second Group would pass that fix, followed by the third Group, thirty seconds later. We were then in Combat Wing formation. The navigators in the lead airplanes had a tremendous responsibility, to ensure that the rendezvous times were strictly adhered to.


There were three Divisions in the Eighth, the 1st, 2nd and 3rd. The 1st and 3rd Divisions consisted of B-17s only, and the 2nd Division was B-24s. The B-24s were faster than the B-17s, but the B-17s could fly higher, therefore, the two were not compatible in formation. As a result the 1st and 3rd Divisions would fly together and the 2nd Division would fly separately.

Now that the Groups were flying in Combat Wing formation, it was necessary to assemble the Divisions. This was usually accomplished at the "coast out"--a city on the coast, selected as the departure point "fix." The Group leader in each Combat Wing knew his assigned position in the Division, and the precise time that he should arrive at the coast out departure point, to assume that position in the Division formation. The lead Group in the Division, which had been selected to lead the Eighth on the mission, would be first over the departure fix. Thirty seconds after the last Group in the first Wing passed that point, the second Wing would fall in trail, and so on, until all Combat Wings were flying in trail and the Division would be formed. One minute later, the lead Group in the other Division would fly over that point, and the Combat Wings in that Division would follow the same procedure to get into formation. When all of its Combat Wings were in trail, the Eighth Air Force B-17 strike force was formed and on its way to the target. At the same time the 2nd Division B-24s were assembling in a similar manner and also departing to their target.


Meanwhile, as the bombers were assembling for their mission, pilots from the Fighter Groups were being briefed on their day's mission. Normally, 600 to 800 P-38's, P-47's, and P-51's would accompany the bombers to provide protection against enemy fighter attacks. Fighter cover was not needed by the bombers until they were penetrating enemy territory, therefore to help conserve fuel. fighter takeoffs were planned to give them enough time to quickly assemble after takeoff, and climb on course up the bomber stream to the groups they would be covering. The combined strength of the fighters and bombers brought the total number of aircraft participating in a mission to approximately two thousand.



A major problem that presented itself, on each mission, was that the bomber stream was getting too stretched out. It was not uncommon for the headlines in stateside newspapers--in trying to show the strength of our Air Force--to state that the first Group of bombers was bombing Berlin, while the last Group was still over the English Channel. It made great headlines but was a very undesirable situation. It meant that the Groups were out of position, and not keeping the proper separation. Furthermore, it was almost impossible for them to catch up and get back into the desired formation. This made the entire bomber stream more vulnerable to fighter attacks.


Finally, our planners figured out what we were doing wrong. When the first Group departed the coast out fix, it started its climb to what would be the bombing altitude. Then, as each succeeding Group departed that fix, it, too, would start climbing. The problem with this procedure was that, as soon as the first Group started its climb, its true airspeed would start to increase, and it would encounter different wind velocities. Now it would start to pull away from the Group in back of it, and the "stretchout" of the bomber stream would begin. By the time the last Group had reached the coast out, to start its climb, the first Group would be leveled off, with a true airspeed approaching 250 miles per hour, and the bomber stream would be really stretching out.

The solution to this problem that had been frustrating the Bomber crews for so long was pretty simple. We would no longer start climbing at the coast out, but instead, at a designated time, all Groups would start climbing, irrespective of position. This meant that we all would have similar true airspeeds and would be influenced by the same winds aloft. That took care of the problem. It was still possible for a Group to be out of position, because of poor timing, but the entire bomber stream wouldn't get all stretched out.

When you consider the way our Air Traffic Control system operates today, and all the facilities at their disposal to guide each individual airplane through the sky to ensure its safety, it's almost unbelievable that we were able to do what we did. To think of launching hundreds of airplanes, in a small airspace, many times in total darkness, loaded with bombs, with complete radio silence, and no control from the ground, and do it successfully day after day, with young air crews, with minimum experience, is absolutely mind boggling.

The accomplishments of the Eighth Air Force have been and will be reviewed by historians from World War II on. There never will be another air armada to compare to it. I feel confident that they will never cease to be amazed by our ability to assemble hundreds of heavy Bombers, under the conditions we were confronting, into the devastating strike force we now fondly refer to as, "The Mighty Eighth."

Leslie A. Lennox
Lt./Col. USAF(ret)

• Vmc demo gone wrong

Interesting story about spinning a B-25 --> here.

In the category of "been there done that"—in a Baron, not a B-25—I know the feeling. My instructor was demonstrating Vmc and stalled in the process, the same as happened in the referenced story. At the time I didn't realize he'd done it unintentionally, and—from lack of experience—I didn't realize ehwas trying to kill us.

For the last few years I’ve flying fam and training hops in a C-45 for the FAA. Vmc is well above stall speed, as it is in the B-25, and there’s no excuse for departing the aircraft with one engine pulled back.

But out of curiosity, I tried yanking an engine in a B-25, below Vmc, using a simulator I fly, IL2. (It has the best flight physics of any sim I’ve flown, BTW. If you're inclined to such pastimes, I highly recommend it.)

video

Same setup as the story: dirty stall, cleaned her up, then chopped the power on the right side. She did spin, and did go over on her back— which if you think about is exactly what you’d expect. One wing is moving faster, thanks to the yaw, so it has more lift and over ya go.

But unlike Hennessy’s account I didn’t have any trouble recovering in the sim—unless I had a notch of flaps. Then I couldn’t stop the rotation or break the stall. The spin went real flat, but power on the opposite engine did help, after a fashion. However, as in the story, it did go back into a spin the opposite direction. I’m guessing the flaps blanket the rudders and elevator creating the loss of control.

I started the dirty simulation in the B-25 at 9,000 feet, and eventually crashed in the ocean. Tried it again retracting the flaps after 3 rotations, and recovered at 5,000.

I’m guessing that in Hennessey’s case someone looked to see if the bird was clean, realized it wasn’t, and sucked up the remaining flaps.

As wonderful as IL2 is, and as many hours of fun as I’ve had with it, I won’t claim it’s a 100% faithful model of the dozens of WW2 aircraft. But I got to fly a ‘51 yesterday:




Tried it online today and it's surprisingly close to the exprience if far less sensual. The real one feels like a .45--hard, pure function, and loud. The sim is more visual than visceral.