Realistic Aerobatic Excitement at Oshkosh (GB1 GameBird and L-39X)

It is great to see the Blue Angels, but how many of us have the money and connections necessary to purchase an F/A-18?

At Oshkosh 2018 there were a couple of realistic aerobatic options to which ordinary humans can aspire.

The first is the GB1 GameBird, a solid block of carbon fiber whose design and certification was funded by the Walmart family fortune. Designer Philipp Steinbach awed the crowd with a demo of this magnificent machine, which can handle unlimited aerobatics (too bad the human body can’t handle the 19Gs to which the airframe was tested) more typical of a 1-seater but has two seats and a significant cross-country fuel capacity (84 gallons).

I asked the designer how this is different than the steel-tube-and-fabric Extra 330LT, purportedly a touring aerobatic two-seater:

Main difference to a 330LT is that the GB1 is fully aerobatic up to unlimited level, and has an empty weight of a 330SC. This, other than more performance, also makes for more legal payload, which is interesting for a flight school. The acrotank holds 25 gal, so there’s no need to switch tanks or ferry to the practice area on wingtanks etc.

Front cockpit has full engine instruments, throttle, mixture and prop, and access to radio and transponder. The airplane is not more difficult to fly or land than a Super Decathlon, but it is obviously a lot more responsive.

One of our local experts looked at the GB1:

The 25 gal acro tank is a huge plus. The Extra 300 has 10.6 gal (330 has 18.2) so you are pretty much a fuel emergency when you take off in the 300. This isn’t an issue at contests, but it is when you’re training students with the ferry time to the practice area. The training flights I did in the Extra — we took off with gas in the wings and ran them as low as we could, but we were never really sure they were empty before doing acro. Apparently some Extra owners have had to do some invasive maintenance to replace fuel cells from doing acro with gas in the wings.

He is right about most advanced and unlimited aircraft not being true 2-pilot airplanes. The pitts/eagle family absolutely cannot do legal acro with two 180lb men in the aircraft. I’ve had to teach myself snap rolls and inverted spins because I can’t fly with an instructor in my Eagle. I think the extra isn’t as limited as the pitts, but still limited.

The company is certifying this VFR-only aircraft with the Garmin G3X PFD, designed for experimentals. The cost? $400,000. When you consider that the Super Decathlon, designed mostly in the 1940s, is $260,000+, you’re getting all of the design and certification for free. Another way to look at this airplane is that it cruises as fast and nearly as far as a Cirrus SR22. It holds two people rather than four, but it costs only half as much. (On the third hand, with no autopilot or IFR certification, the GB1 might arrive a week after the SR22 if the weather is not cooperative!) I’m going to try to visit the factory in Bentonville, Arkansas. (It was already on “A 48-state tour of the U.S. by light aircraft“)

The other realistic way to be the envy of everyone at the airport… the L-39 experts at Code 1 Aviation have managed to stuff a conventional bizjet engine into the Czech trainer: press release. They’ve done four of these so far and it can cost as little as $250,000 to get an as-removed Garrett/Honeywell engine from a parked bizjet, with at least 1,000 hours to go, and install it in the L-39. Considering that a decent L-39 can be purchased for as little as $200,000, the total package need not cost much more than a GameBird. The bizjet engine results in longer range, faster cruise speed, lighter weight, much faster throttle response (less spool-up time), and certainly far easier maintenance. (The L-39 Wikipedia page says that the OEM is trying to do this as well, putting a 1980s Williams FJ44 engine into the plane and calling it an “L-39NG”. Pricing will probably not be civilian-friendly!)

The L-39 was certified to only +8/-4G so it can’t do the crazy RC-style maneuvers of the GameBird. The Code 1 folks don’t recommend going beyond 7G with the civilian engine installed. However, an L-39 certainly looks cool! The full L-39X will cost $850,000 to $1 million and includes a lot of additional upgrades.

An L-39X was parked at Oshkosh and you could see a lot of folks adding it to their wishlist.

If hangar rents come down and mechanics become more available… we should buy one of each!

Related:

• it would be nice if the Auto-GCAS system from the F-16 could be put into both of these; there have been a lot of accidents in the aerobatics world that could have been prevented by software and sensors