Inside the World's Smallest Plane Ever Built

Added: 2026-05-13

[00:00:00]What if I told you someone spent years of their life building an aircraft specifically because they lost a record to a rival and then they built an even smaller one, flew it, broke the record and crashed it all within 33 days. This is the Starr Bumble Bee II. So who is the man behind all this? His name is Robert H. Starr and he is not someone who comes up much in aviation history and that is genuinely strange given what he managed to accomplish over the course of his career. He was a World War II veteran. He flew P-40 Warhawks and P-51 Mustangs with the 14th Air Force Flying Tigers in China which, if you know anything about the Flying Tigers, tells you he was operating in one of the more demanding combat environments of the Pacific War. Long missions, mountainous terrain, limited ground support and enemy fighters that had been flying those skies considerably longer than the Americans had. By the time the war ended, Starr had already developed the kind of relationship with unusual aircraft and difficult flying conditions that most pilots simply never get close to. Over the decades that followed, he logged over 15,000 hours across everything from Piper Cubs to F-86 Sabre Jets. He flew aerobatics at air shows across the United States. He worked [music] as a test pilot for experimental aircraft and in 1949, he became the only pilot capable of flying an experimental micro aircraft called the JR. That last detail is worth sitting with for a moment. Other pilots tried, the aircraft broke. That tells you something about the caliber of the man before we even get to the record breaking part of the story. He then helped build and fly the Stits Skybaby in 1954. That was a biplane with a wingspan of 7 feet 2 inches and it set a new world record for the smallest piloted aircraft. Starr was there for the construction and he was the one who flew it. And for a while, he felt the recognition he received for that contribution was not quite proportional to what he had put in. That frustration matters because it explains why the Bumble Bee happened at all. Star had a falling out with Ray Stits, the designer behind the Skybaby. The exact nature of the disagreement is not fully documented, and neither man left a particularly detailed account of what went wrong between them. What is clear is that Star felt his contributions to the early small aircraft projects had not been properly recognized, and that the falling out with Stits was serious enough that the two men went their entirely separate ways. When the two went separate ways, Star decided he was going to build his own aircraft, establish his own record, and this time have his name on it without ambiguity.

[00:02:48]It took him several years of work in his Phoenix, Arizona workshop, but in January of 1984, he got there. The Bumble Bee One, a biplane with a wingspan of 6 ft 6 in, and a length of 9 ft 4 in, flew at Marana Airport and claimed the Guinness record for the world's smallest piloted aircraft. Then, 7 months later, a man named Donald Stits flew away with the title. Donald Stits was Ray Stits's son. He had been building a monoplane called the Baby Bird since around 1980, and in August of 1984, it made its first flight at Camarillo, California with pilot Harold Neemann at the controls. The Baby Bird had a wingspan of 6 ft 3 in, 3 in narrower than the Bumble Bee One.

[00:03:35]Its length was 11 ft, which was actually longer than Star's aircraft, but Guinness assessed overall size using multiple measurements, and by enough of those criteria, the Baby Bird came out smaller. The record moved. For Star, this was was one frustration too many. He went back to the workshop, and this time the aircraft he built was going to be so clearly and unambiguously small that nobody could find a reasonable argument against it. The Bumble Bee 2 that came out of that workshop was a biplane, like its predecessor, with what is called negative stagger. That means the lower wing was set slightly forward of the upper wing, rather than behind it, which is the opposite of how most biplanes are configured. The fuselage was built from welded steel tubing covered in sheet metal, and the wings were covered in aircraft-grade plywood. Both wings were fitted with tip plates at the ends.

[00:04:30]These are small vertical surfaces attached to each wingtip. Their job is to reduce the vortex that forms at the tip of any finite wing, where the high-pressure air below tries to curl around and meet the low-pressure air above. By blocking some of that curl, the tip plates improved the effective lift of the small wing area made the aircraft more manageable in flight. This was not a stylistic choice. Without them, the wing loading on an aircraft this small would have pushed the handling towards something genuinely unworkable. The choice of biplane over monoplane was also deliberate. Two smaller wings allowed Starr to distribute the total wing area in a way that kept the wingspan down while still generating enough lift for the weight. A monoplane with the same total wing area would have needed either a longer wingspan or a very short, very wide chord. Both created problems Starr didn't want to deal with. Here is where the dimensions become genuinely difficult to visualize if you haven't seen photographs. The wingspan of the Bumble Bee 2 was 5 ft and 6 in. If you are of average height and you stretch your arms out fully, your armspan will be around 5 ft 8 in.

[00:05:43]So, you, standing with your arms out, would be wider than this aircraft. Not by much, but wider. The length of the fuselage was 8 feet and 10 inches. That is roughly the same as a standard parking space. The aircraft would fit inside most people's living rooms with space to spare around the walls. You could lay it diagonally across a tennis court and it would not reach from one tram line to the other. It is genuinely difficult to hold the image in your head of something that small flying at 165 knots. And yet, that is what it did.

[00:06:17]Empty weight was 396 pounds. To give that a sense of scale, that is roughly the weight of a large touring motorcycle or about 2 and 1/2 adult passengers on a commercial flight.

[00:06:29]Maximum takeoff weight was 574 pounds, meaning the useful load, everything including the pilot, the fuel, and anything else on board came to 178 pounds in total. Robert Starr himself was around 200 pounds, which meant that even before any fuel went in, the aircraft was already close to its useful load limit. The fuel load was kept to an absolute minimum as a result, which we will come back to shortly. The engine was a Continental C85, four cylinders, air-cooled, horizontally opposed, producing 85 horsepower. This is an engine you would normally find in a conventional two-seat trainer, the kind of aircraft used to teach student pilots their first hours. It is a reliable, well-proven unit, but it is not what you would describe as powerful by any meaningful standard. In the Bumble Bee II, it was doing something altogether more remarkable. 85 horsepower in an airframe weighing under 400 pounds empty with a total wing area of around 35 square feet produced performance figures that sound implausible when you see them next to the dimensions of the aircraft.

[00:07:40]Maximum speed was 165 knots. Cruise was 130 knots. Rate of climb was 4,500 ft per minute, which is faster than a number of light jet aircraft manage. Service ceiling was 14,000 ft. Those numbers do not belong to something with a 5-ft wingspan, and yet there they are. Part of the reason the performance is so striking is the weight-to-power ratio. 85 horsepower in a 400-lb airframe gives you a ratio that most light aircraft can only dream about. The Cessna 172, which most pilots learn to fly in, has around 160 horsepower and weighs 2,550 lbs empty. The Bumble Bee Two had more than half that power at less than a sixth of the weight. That is why the climb rate is 4,500 ft per minute. That is why the maximum speed is 165 knots. The physics are working in Starr's favor in terms of raw performance, even while they're working against him in terms of wing area and handling. The fuel tank held 3 US gallons. 3 gallons gave the aircraft around 30 minutes of flying time at cruise power, which works out to a practical range of roughly 16 nautical miles. That is not a misprint. You could not fly this aircraft from one side of a city to the other in most cases. What you could do was take off, demonstrate that it flew, set a record, and land before the fuel ran out. That was the design intent, and that was the operating profile. Guinness World Records observers were at Marana Airpark, just outside Tucson, Arizona, on April the 2nd, 1988, when Starr flew the Bumble Bee Two for the first time.

[00:09:26]He would have been 64 years old. The aircraft had a stall speed of 75 knots and a wing area about the size of a dining table. Getting it into the air required a very specific combination of technique, timing, and the kind of calm that only comes from having flown things that most people would decline to climb into. The aircraft taxied out, accelerated down the runway, and lifted off. It flew a circuit. It landed. The Guinness observers took their measurements, confirmed the wingspan of 5 ft 6 in and the length of 8 ft 10 in and declared the record achieved. The Bumblebee II was the world's smallest piloted biplane. And by wingspan and by length, it was also smaller than the Baby Bird on both of those dimensions individually, which made it arguably the smallest piloted aircraft of any configuration ever flown. But that last part, that was where things got complicated. Guinness had a problem on their hands. The Bumblebee II was shorter and narrower than the Baby Bird.

[00:10:29]5 ft 6 in vs. 6 ft 3 in of wingspan. 8 ft 10 in vs. 11 ft of length. On both of those measurements, the Bumblebee II won clearly and without ambiguity. But the Baby Bird weighed only 250 lb empty. The Bumblebee II weighed 396.

[00:10:49]Some of the Guinness adjudicators took the position that weight was a reasonable component of overall size and that the heavier aircraft couldn't claim to be smaller overall regardless of its external dimensions. That argument has a certain logic to it if you think about size in terms of mass. It makes considerably less sense if you are standing next to both aircraft trying to work out which one takes up more space in the world. The deliberation went on for a while. In the end, Guinness arrived at what was fairly clearly a diplomatic solution rather than a definitive one. The Bumblebee II got the record for the world's smallest piloted biplane. The Stearman DS-1 Baby Bird got the record for the world's smallest piloted monoplane. Both certificates were issued. Both records have stood ever since. Neither side was entirely satisfied, but both had something to show for their effort, and the matter was no longer actively contested. Starr, characteristically, kept flying. He had a record. He had a certificate. As far as he was concerned, the matter was settled. The crash happened on May the 5th, 1988, 33 days after the record flight. It was the third time the Bumble Bee II had left the ground. Starr was flying a standard traffic pattern at Marana Airpark when the engine quit at 400 ft of altitude on the downwind leg.

[00:12:11]>> [music] >> In a conventional aircraft, losing the engine at 400 ft on downwind is a serious emergency, but it is not necessarily a fatal one. You are in the general vicinity of the airfield. You have some altitude. You can try to stretch a glide back to the runway or identify a field and put it down with a controlled arrival. In the Bumble Bee II, the options were considerably more limited. Think about what 75 kn means as a stall speed. Most light training aircraft stall at around 40 to 50 kn.

[00:12:43]The Cessna 172 stalls at around 48 kn with flaps down. The Bumble Bee II needed to be doing at least 75 kn just to stay in the air. Any slower than that, and it stopped flying. So, to stay in the air and avoid a stall, Starr had to keep the airspeed above that number.

[00:13:02]To get back to the runway, he needed to maneuver the aircraft while simultaneously managing his energy. In a very small, very fast, very sensitive aircraft with 35 sq ft of wing area and no engine at 400 ft above the ground, the margin between managing that situation and not managing it was extremely thin. There was not enough altitude for mistakes. The aircraft came down short of the runway. It was destroyed. Robert Starr survived, though his injuries were severe enough that a full recovery, which he eventually made, was not a certainty in those early weeks. He was 64 years old. He had flown over China in fighters, tested aircraft nobody else would touch, and spent a lifetime accumulating 15,000 hours of experience that was supposed to be exactly what you needed to manage situations like this. The Bumble Bee Two was still the aircraft that put him in hospital. He never rebuilt it. The wreckage was not restored. Unlike the Bumble Bee One, which Starr had donated to the Pima Air and Space Museum in Tucson, Arizona, the Bumble Bee Two left behind nothing physical. No airframe, no components, no cockpit to lean into, just photographs, a Guinness entry, and the account of what happened on those three flights. If you want to understand the scale of what Starr built, the Bumble Bee One is still at the Pima Air and Space Museum in Tucson on permanent display. Most people who see it for the first time react with something between disbelief and mild alarm. It looks like a model. It is not a model, and that is the larger aircraft. The Bumble Bee Two was smaller. For the other side of the rivalry, the Stits DS-1 Baby Bird is on display at the EAA Air Venture Museum in Oshkosh, Wisconsin. 6 ft 3 in of wingspan, 11 ft long, a 55 horsepower engine, a maximum speed of around 95 knots. Pilot Harold Neemann flew it 35 times before it was retired in 1989. It sits there with its Guinness certificate and its record as the world's smallest monoplane. Almost nobody who walks past it knows what they are looking at until someone stops to explain. There is something worth finishing on, which is the sheer strangeness of this particular corner of aviation. The competition for the world's smallest aircraft was never about commercial viability or practical application. Nobody was going to build a fleet of Bumblebees. Nobody was going to commute to work in a Baby Bird. These aircraft existed purely to answer a question. How small can you go and still leave the ground with a person inside it? And the men who built them did so out of engineering pride, competitive stubbornness, and a genuine desire to do something that other people said was impossible. Robert Starr named his aircraft after the Bumblebee for exactly that reason. The popular legend, largely mythological but persistent, holds that according to standard aerodynamic calculations, the Bumblebee should not be capable of flight. Its wing area is simply too small for its body weight.

[00:16:11]And yet, the bee flies anyway. Engineers had made similar statements about Starr's aircraft. He found the comparison entirely appropriate. And he was not wrong to. The Guinness record for the world's smallest piloted biplane still belongs to the Starr Bumblebee II.

[00:16:27]It has stood for nearly 40 years and nobody has come close to challenging it.

[00:16:31]Partly, that is because the engineering difficulties are real. Partly, it is because making something with a wingspan shorter than 5 ft 6 in while keeping a person alive inside it at any meaningful speed pushes up against the fundamental limits of what wing loading and controllability will physically allow.

[00:16:50]At some point, the wing simply cannot generate enough lift to keep the aircraft flying at a speed above its own stall speed. There is a flaw somewhere near what Starr built. He may have been standing on it. And partly, perhaps, because the story of how the record was set and then destroyed within the same month is enough to give anyone thinking about trying a reason to pause and think carefully about whether they really want to. Robert Starr recovered from his injuries. He kept flying in other aircraft. He never tried to reclaim the biplane record, and he never explained publicly whether that was because the crash had changed his calculations, or simply because he felt the point had already been made, and there was nothing left to prove. Perhaps that is the right place to leave it. A man who flew fighters over China, tested aircraft nobody else would sit in, built a biplane smaller than his own arm span, flew it at 165 knots, set a world record that nobody has beaten in 40 years, crashed it 33 days later, survived at 64, and then went back to flying other things without particular fanfare. Smaller than everything parked near it in that museum. Larger than the aircraft that proved [music] the concept possible, and then disappeared into a field in Arizona. If you enjoyed this, subscribe.

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