"Harry Potter! Why did you make such an appalling aircraft for the match!" Hermione screams as she walks into Harry's workshop.

"What's wrong with the Thunderbolt!?" Harry asks, outraged. "It's fast, that's all a seeker needs. It's not like the Cannon's have high expectations."

"It's too heavy! You need a dogfighter, or at least a good all rounder!" Hermione rants, "Just take my Spitfire, it will do better."

"I'm not taking that! It's a half decade older design!" Harry protests.

"It was still in service, and I have about the same power as late war designs!" Hermione argues.

"But you kept the out-dated wings from the Mk. 1." Harry replies.

"That's the iconic look!" Hermione retorts.

"I'm not taking it and that's final." Harry states.

"Fine, but did you have to make an American plane? If you wanted speed you should have made a Hawker Typhoon, at least that's British. And if you insisted on American, you should have made a Corsair. It is better in almost every way." Hermione lectures.

"The Thunderbolt is faster than the Corsair!" Harry argues.

"At super high altitudes! Not at quidditch altitude." Hermione replies.

"But our magic engines don't care about altitude. Both planes fit the same engine!" Harry complains.

"It's more than just the engine, what about aerodynamics?" Hermione asks.

"We don't have any test data on that." Harry comments, suddenly distracted by a thought. "We should build a wind tunnel."

"Why do we need a wind tunnel?" Hermione asks.

"To test our future designs of course, we were lucky the Great Griffen even flew straight." Harry answers, thinking about their wonderful flying yacht.

"You are right about that, but couldn't we just get a computer?" Hermione questions.

"And spend days waiting for simulations when we can just conjure a model and put it in a tunnel for an hour? I think not." Harry retorts.

"Fine, but it won't be a big one." Hermione consents, wondering where that would fit on the abandoned airstrip they had bought with what was left of Harry's parents gold.

"Wonderful. Now let's get this bird to the stadium." Harry says with excitement growing in his voice.

"Try not to embarrass yourself, this may be our only chance to get some customers in the international market." Hermione sighs.

"Wouldn't it be better if I do something outrageous? It's not like this would ever replace a good broomstick and it would me more likely to hit the front page." Harry asks childishly.

Hermione answered with a smack on the back of Harry's head as she walked by to start the final checks on the Chudley Cannon orange Thunderbolt.

"And here are the Chudley Cannons!" An announcer shouts over the cheers of an excited audience. "Today we have a special guest seeker for the Cannons! Flying a prototype Thunderbolt magic aeroplane, the one and only Harry Potter!"

As the crowd's cheers reached a new level of excitement Harry raced across the field at over four hundred miles an hour shocking the audience and raising eyebrows among the international spectators.

"Wow that's fast, but will that speed catch the snitch? We'll soon find out!" The announcer shouts.

As the match begins Harry flies in a lazy circle over the pitch rolling and swerving to get a feel for the maneuverability. The Appleby Arrow's seeker was tentatively following him, still nervous around the massive machine. The match was of course a blowout and soon the Cannons were down enough that the snitch really didn't matter, but ever the optimist, Harry kept looking.

After another half hour and a now five hundred point deficit, Harry spots the snitch and dives racing for the ground, the Arrow's seeker soon following the best she could. As the Thunderbolt races to the ground Harry notices some strange misty vortexes on the propellers and soon after the craft begins to shake, a moment later a thunderous boom shakes the stadium as the Thunderbolt breaks the sound barrier in the dive. Unfortunately for Harry he hadn't boosted the hydraulics of the Thunderbolt from the original design. And when he tries to pull up the stick wouldn't budge and soon broke. Grabbing his emergency broom Harry leaps from the cockpit just before the plane slams into the ground, unbreakable charms failing as it digs into the soft English countryside.

Harry soon falls to the ground, clutching his stomach and panicking; and then in a moment reminiscent of his first quidditch match Harry regurgitates the snitch, which had somehow ended up in his mouth again.

"And Harry Potter has caught the snitch! A first for the Cannons in a long time! Even with the loss their fans are going wild! What a match!" The announcer cheers.

The cheering continues until a small explosion occurs near the cheering Harry.

"HARRY POTTER!" Hermione screeches over the crowd. "What in the name of all things magical do you think you were doing! That was way past the allowed safe speed!"

Harry, ever the Gryffindor made the choice to flee at that moment, quickly asking Dobby to collect the broken Thunderbolt for analysis before fleeing the stadium with a furious Hermione right behind him.

Nigel Westwood was having a good day, he had decided to refresh his memory of helicopter piloting for the student he was expecting in a few weeks. He is flying comfortably around fifteen minutes south of Exeter, when he notices something rather alarming. About one mile to his south east was a Spitfire chasing after a very familiar biplane, both headed in his general direction.

"There he is, that slippery devil!" Nigel exclaims as the memories of him chasing that irritating plane all around London resurfaces and his vision goes red.

And so with a positively uncharacteristic aileron roll, his civilian helicopter takes a supporting position behind the Spitfire in the strangest pursuit of the century.

All across Britain the BBC sent out a special report as a news helicopter came across the strange trio of aircraft.

"No matter what happens today, that has to be the best flying ever seen on British television." The host calmly says as the live footage streams across the country.

"I agree, but what are the legal ramifications of this?" the co-host asks.

"Our experts are inconclusive about that and still no word from the police. MY WORD! Was that a barrel roll from the Helicopter!?" The host shouts in shock.

"Someone stop this before someone gets hurt!" The co-host shouts.

"That's Hermione again isn't it." Ms. Granger says holding back a growing rage.

"I think so dear." Mr. Granger replies loyally.

"Leave open my 7 AM tomorrow, I think Hermione needs a routine dental appointment." Ms. Granger says deviously.

"Isn't that a bit much? She's a married woman now." Mr. Granger protests.

"Do you want me to get you the 6AM?" Ms. Granger asks.

"No dear, the punishment is fair dear." Mr. Granger replies nervously.

What none of them knew was that fifteen years later the footage would reappear on the internet and go viral, to the cheerful tune of 'These Magnificent Men in their Flying Machines.'

AN: And that's the end. I probably won't update this again for a while, this chapter was mainly some fan-service for everyone, including my sister, who I promised to write this over Christmas. (I'm not late, definitely not).

I don't know when fluid dynamics could be simulated on a computer, but I'm sure on early 2000s calculators it would take ages. Even modern computers take quite some time (for a computer) on the simplest models when it comes to fluids.