Another unleaded 100LL replacement approved (Swift 100R)

[asicer]

FAA Approves 100R Avgas In Cessna 172s | Aviation Week Network

The FAA said Sept. 17 that it has granted approval for the use of a second 100-octane unleaded fuel in piston aircraft, specifically Cessna 172R/S Skyhawks.

aviationweek.com

It's an STC for the 172R and 172S, which can already burn UL91 so

 

[Cap'n Jack]

It's a start- just two models for now.
This seems promising, from the same article

A third unleaded avgas candidate—UL100E—is undergoing full-scale engine and airframe testing under the FAA’s Piston Engine Aviation Fuels Initiative, which could lead to the agency granting fleetwide authorization for its use in 2025.

 

[eman1200]

how many gallons of G100UL have been sold so far?

 

[GeorgeC]

how many gallons of G100UL have been sold so far?

mogas pilots be like

 

[Lowflynjack]

mogas pilots be like
View attachment 133768

Yeah, but they're doing that from the carburetor rebuild shop!

 

[Capt. Geoffrey Thorpe]

You gotta FIGHT for your RIGHT to BURN LEAD!

 

[StraightnLevel]

Cool!

How long until we start seeing exhaust gas sensors and FADEC with true closed-loop control?

 

[Checkout_my_Six]

Cool!

How long until we start seeing exhaust gas sensors and FADEC with true closed-loop control?

which EAB's are running that?

 

[StraightnLevel]

which EAB's are running that?

The fact that aviation is currently 50+ years behind every other industry that uses internal combustion engines is not a reason to block progress.

As an aside, it's at least been looked at in turbine applications:

https://ntrs.nasa.gov/api/citations/20070010763/downloads/20070010763.pdf

 

[Capt. Geoffrey Thorpe]

How long until we start seeing exhaust gas sensors and FADEC with true closed-loop control?

I'm pretty sure that something like that would result in fiery death raining from the sky.

 

[GeorgeC]

2016

Auto-lean in a Mooney M20

What do you think about auto lean taking care of business for you?

www.pilotsofamerica.com

2018

Lean on me

The optimum air/fuel ratios for piston-engine power and efficiency have been known for decades—but aircraft engine gauges don’t display them. Pilots monitor exhaust gas temperatures, fuel flows, and cylinder head temperatures—all indirect indications of the air/fuel ratio (AFR). Things get even...

www.aopa.org

 

[wayneda40]

Cool!

How long until we start seeing exhaust gas sensors and FADEC with true closed-loop control?

Just to remind everyone... there is at least one progressive piston GA manufacturer... full FADEC is found in the Diamond DA40NG, DA42, DA50, and DA62 models (all with diesel engines burning JetA).
Wayne

 

[SoonerAviator]

which EAB's are running that?

Any of the ones with Rotax "iS" engines.

 

[midwestpa24]

What the industry is really waiting on is blanket approval of a drop in replacement for 100LL, no STC or paperwork needed. Something that an FBO could just start ordering tomorrow instead of 100LL.

However I don't think the FAA or manufacturers have the stomach for it, no one wants to be liable for even one incident that could be remotely traced back to UL.

 

[Pinecone]

The fact that aviation is currently 50+ years behind every other industry that uses internal combustion engines is not a reason to block progress.

And both Continental and Lycoming have gone there, and no one wanted to buy them

 

[Pinecone]

What the industry is really waiting on is blanket approval of a drop in replacement for 100LL, no STC or paperwork needed. Something that an FBO could just start ordering tomorrow instead of 100LL.

However I don't think the FAA or manufacturers have the stomach for it, no one wants to be liable for even one incident that could be remotely traced back to UL.

That is not going to happen, because the FAA doesn't have the authority to do that. And the type certificates call for ASTM 910 fuel, which requires it to contain lead.

Even Swift is going STC. But they also say it won't work in all the fleet anyway. Not very drop in.

Also, interested thread comments over on BT. The supercharge rating (the second number in 80/87, 91/96, 100/130, and 115/145) is something over 150 for G100UL, raising the possibility to run higher boost for turbo charged engines for take off and other full throttle operations. Meaning more HP.

 

[StraightnLevel]

And both Continental and Lycoming have gone there, and no one wanted to buy them

Sure, but when you don't have the right fuel for the control system, why would you buy?

UL fuel is the catalyst required to open the door to engine controls from this century, as opposed to our current prior-century lumps.

 

[sansoneservices]

FAA Approves 100R Avgas In Cessna 172s | Aviation Week Network

The FAA said Sept. 17 that it has granted approval for the use of a second 100-octane unleaded fuel in piston aircraft, specifically Cessna 172R/S Skyhawks.

aviationweek.com

It's an STC for the 172R and 172S, which can already burn UL91 so

Anyone hear of pricing? Anyone see swift offered at airports?

 

[rockwoodrv9a]

Im ready for a different fuel. I run as lean as I can with a carb and I still had lead fouling on my plugs when I checked them on my annual today. The pugs were easily cleaned with a piece of safety wire but my borescope pictures show lead deposits on the inside. I my start using Rec gas as they call it here in Michigan. No alcohol. I use it in my mowers and motorcycle. Might as well go in the plane too.

 

[Palmpilot]

mogas pilots be like
View attachment 133768

My impression is that alcohol-free mogas availability varies greatly across the country.

 

[Palmpilot]

Anyone hear of pricing? Anyone see swift offered at airports?

Swift's UL94 is available at a few airports near me, but I'm pretty sure that is the exception rather than the rule.

 

[AV8R_87]

Cool!

How long until we start seeing exhaust gas sensors and FADEC with true closed-loop control?

In certified GA? Probably in 100 years.
In the experimental world? That engine pretty much exists today.

 

[SoonerAviator]

Sure, but when you don't have the right fuel for the control system, why would you buy?

UL fuel is the catalyst required to open the door to engine controls from this century, as opposed to our current prior-century lumps.

Well that, and the fact that the manufacturers like Cessna/Piper are some of the largest consumers of the Conti/Lyco engines and they'd have to do a good bit of recertification/design work in order to retrofit their aircraft to a FADEC engine. On an Experimental or a model refresh the paperwork hurdles would already be accounted for.