Mogas aircraft engines. Your engine is definitely just fine to be used with Mogas.

Mogas aircraft engines 's 100-octane unleaded avgas that, when combined with approvals announced in July, account for about 70 percent of the GA aircraft fleet's powerplants. 000 engines, Rotax aircraft engines lead the light sport and ultralight aircraft market. For aircraft with a Permit to Fly administered by the Light Aircraft Association (LAA), MOGAS must only be used in accordance with CONTINENTAL® AIRCRAFT ENGINE OPERATOR’S MANUAL FAA APPROVED. Supplying Hummel Aircraft with engines is clearly the main business here, but Hummel Engines also does plenty of business building four- and mainly two-cylinder VW-based engines for the rest of the hobby. Your engine is definitely just fine to be used with Mogas. Hi, Is anyone running a Jabiru engine on Mogas? We are flying J160 and currently run it on Avgas. Mogas is relatively cheaper and equivalent to service-station Super gasoline – plus a few additives. To qualify, And then there’s the aircraft owners and pilots. / 140 Service bulletins Frequently asked questions ULPowered aircraft Step files Prop flanges Mogas 95 or 97 / 98 Read more. The fact is though the engine is looking and running great with great compression numbers and I never foul anything up with lead either, I actually get a lot of comments from the MOGAS fuel users must more often do detailed inspections to avoid fuel system malfunctions or even damage to the aircraft engine. Only place I know of is Sebring FL that sells it. The Corvid-50 engine has passed an assessment against the endurance test specified in the US Federal Aviation Regulation Part 33 (FAR33). There is no fundamental reason MOGAS cannot be safely used to power automotive engines in aircraft applications. ” Powering the majority of Cessna ® 180 and fixed-gear 182 aircraft from 1953 through 1986, this workhorse of an engine embodies simplicity, efficiency and ruggedness. While most engines can run satisfactorily on unleaded our aircraft engines need lead at least during the break in process unless new spec hardened parts have been installed. Yes, I know you do not need to comply with STC's re. Ltd. AVGAS is highly refined with very Among the nearly 4,000 people who have so far signed it, many are airplane owners who have documented the impact of ethanol contamination of Mogas, the other FAA-approved aviation fuel that can safely and affordably power 70%-80% of all piston engine aircraft, and nearly 100% of a new LSA airplanes. ) Spark: Piston aircraft engines commonly operate on aviation gasoline (AVGAS) and motor gasoline (MOGAS). Peak pressure is increased by high In Germany we know that about 50% of all fuel sold for piston aircraft is mogas. Avgas is distinguished from conventional gasoline (petrol) used in motor vehicles, which is termed mogas (motor gasoline) in an aviation context. The same concerns of octane ratings, effects of ethanol, and useful life of Ethanol can reduce aircraft performance and cause buildup within the engine and fuel system. Key Considerations: The FAA has approved approximately 611 more engine models to burn General Aviation Modifications Inc. So I was a bit surprised when I noticed this The engine can be supplied with Currawong’s power supply incorporating the remote starter feature. The Jabiru 3300 is a six-cylinder direct-drive air-cooled aircraft engine from Jabiru Aircraft Pty. The use of unleaded MOGAS is restricted to single engine aircraft or rotorcraft of MTOM <2730 kg, with a certified aircraft/engine combination (Refer to paragraph 5 of this OSC). Engine models approved for the use of autofuel in airframes listed below. Date Revision*/FAA 19 • Aircraft / engine manufacturer guidance. When I look on ForeFlight or Garmin Pilot for airports selling mogas, then call them, it is 87 octane. Icing of the carburetor. Of all the hangar talk one encounters at airports, the subject of using automotive gasoline in airplane engines is among the most contentious. 4. specifically for aircraft. If you’ve ever thought about refuelling with Mogas (otherwise known as motor gasoline) instead of Avgas you certainly won’t be the first. *** MOGAS, no hydraulic governor. The cost of the STC package (airframe, engine, and placards) is based on the engine models as follows. Mogas has been an alternative to leaded fuel since 1964 when Experimental Aircraft Association (EAA) began testing on it. Full story Another $10 per hour for good fuel is negligible in the big picture of aircraft ownership. Datasheet 912i S Printpreview rev1 pdf Rotax Aircraft Engines Imagebrochure pdf Technical documentation Genuine spare parts You may be interested in 914 UL | F 115 HP Low-weight Heavy duty aero engine for 2 or 4 seats planes with 6 cyl. Leaded AVGAS is also approved, but MOGAS produces 91/96 avgas went away 60 years ago as the airlines transitioned from gasoline-burning piston aircraft to kerosene-burning turbojets. Like the gasoline and other gasolines with 100MON or less, including MoGas, where those gasolines are also approved for the same make an d model engines. C. ENGINE DETAILS: JABIRU 100/130 Avgas or 92+ octane Mogas: Oil: Aeroshell W100 (or equivalent) Oil Capacity: 3. Aluminum Engine. Inspection and/or replacement of expansion tank assy. 50 - 100hp piston engine Jabiru 2200. Although it's not Usually aircraft engine manufacturers, like Lycoming and Continental, do not endorse the use of auto fuels but we understand Rotax approves ethanol up to 10 percent. Of the aircraft receiving blanket mogas approval, the most common is the Cessna 150 using a Continental O-200 engine; aircraft not in this category (so called “Category 4”) require an engine and airframe STC. So, although an aircraft may be able to operate on Mogas, other aircraft components have to be considered because of the potential for vapour lock within the fuel system, as well as potential adverse effects on seals and components. continuous power at 5500 1/min *** MOGAS, no hydraulic governor Aircraft Engines . Due to a number of factors (including fuel cost), the Rotax-powered aircraft in our flight school are most often run on MOGAS (Super 95). Some aircraft engines having allowable cylinder head temperatures of 500F. Each will have to make a decision when they will transition to unleaded fuel. No, you cannot determine if the retail "pump gas" is controlled as it needs to be for aviation because filling station pumps do not provide the information needed to match it to "mogas" requirements. Diesel; While not common in our training fleet at Melbourne Flight Training, some aircraft engines are designed to run on diesel fuel, offering better fuel efficiency. And not just high-performance birds – my 125 hp Tomahawk requires 100-octane fuel. Mogas Requirements. One caveat is I wouldn't store the plane with mogas for months. 5 qts. And with the new needles the engine is running a bit richer which reduces the risk for detonation. Since smaller airfields don't always have MOGAS available, they are frequently flown on mixtures of AVGAS and MOGAS during longer In an effort to get the word out about seasonal blends of automotive fuel (mogas) used in aircraft (in the USA) and the risks associated with using a winter blend in warm temperatures, I put together a video of a presentation that I made to a couple of local EAA chapters to share my experience with a near-engine-out over the mountains, what caused it, and what pilots needed In summary, every piston aircraft engine on display, from a 29-hp single cylinder two-stroke motor from Italy's Poloni, to the 400-hp jet fuel-burning diesel from Austro Engines, was designed to Wanna start an argument among other aircraft owners where passion will ring louder than logic? Either bring up Tail wheel vs Nose wheel or ask whether you should use mogas in your engine. My old glider club had thousands of hours of running "high compression" O-360s, a 100LL engine, on premium mogas. This heavy duty engine is the perfect all-rounder. There is not a single fuel injected Lycoming engine approved for mogas use, and then only the low compression engines are good for mogas. This may result in engine failure. Only a Jabiru also say that Mogas of any type should not be used in commercial flight schools and only at the owners own risk. Basically just paperwork. Avgas (aviation gasoline, also known as aviation spirit in the UK) is an aviation fuel used in aircraft with spark-ignited internal combustion engines. (3. Try to find any Mogas that has such a low octane rating. Note: “Lead Replacement Petrol”, “Unleaded 4-Star”, and other products intended to replace leaded petrol are not equivalent to BS:4040 and their use is not approved. for ROTAX® 912, 914, 912 i, 915 i and 916 i (Series Unleaded high-octane fuels do exist for aircraft engines, but those engines have to be certified to use those fuels, a long and expensive process. Actually, there are 2 STC’s, one for the engine and one for the airframe. RCV DF35 Single Cylinder UAV Engine 35 cc Multi-Fuel 4-Stroke Engine. However, in order for mogas to be used in aircraft engines and air frame modification, approval via the Supplemental Type Certificate (STC) authorization from Federal Aviation Administration (FAA) is mandatory. Peak pressure is increased I have always used MOGAS unleaded RON95 BS EN228 without any issues. • European Aviation Safety Agency approval literature. Wanna start an argument among other aircraft owners where passion will ring louder than logic? Either bring up lean-of-peak mixture settings or ask whether you should use autogas in your engine. Fraser Farmer wrote:In my situation I'm paying half for premium Mogas what I would for 100LL at the airport, that adds up fast, like I could overhaul almost twice as often if needed. LAA aircraft/engine combinations. The aircraft used to fly ok, but there were frequent problems with sticking valves etc. Owners and operators of more than 167,000 piston-engine aircraft operating in the United States rely on ULPower Engines have been developed specifically for use in light aircraft and are manufactured to the highest standards with fully electronic ignition and multi-point fuel injection All ULPower engines fly on avgas and mogas — even with mixtures up to 15% ethanol — and can be upgraded with back-up and safety systems. The school where I trained and where I continued to rent uses mogas exclusively in their C150s, C172, PA28, Apache damage to aircraft, engines and their components. STC An aircraft engineer at my local airport has suggested that the best aircraft fuel is mogas with a little avgas mixed in as well. I run my homebuilt's O-290 on If you want more power and mogas 97/ 98 is available, the UL390iS is an excellent choice for your 2 or 4 seats plane. *_Or later FAA Approved revision Item Engine Make Engine Model Cert Basis / Amendment TCDS Master Data List Initial Approval DateApproved Date Amendment Document No. ROTALK is a web based support system which provides a common access point for locating key Information - Education - Support for their Rotax Aircraft Engines such as the Rotax 912, Rotax 914, Rotax 912 iS, Rotax 915 iS, Rotax 503 and Rotax 582. Yes, you can maintain performance ratings on some engines. It does supposedly go bad quicker than avgas. G-WP62CCKJ8P. When the airfield's MOGAS supply shut the group changed to AVGAS exclusively. * leaded, unleaded, AVGAS 100LL, Ethanol 10 ** max. 100kg • 160hp • contact us Lakeland, Florida, March 28, 2023 – BRP-Rotax, a subsidiary of BRP Inc. 75 l. For approved aircraft, why choose UL91 over Mogas: It is an aviation fuel Specifically developed by the aviation industry for flight use. the best just got better When you start your Rotax Aircraft $\begingroup$ You can run all kinds of engines you'd think wouldn't like mogas, even supercharged engines like the R985, and certainly non-turbo engines rated for 100LL octane also run fine on 94 octane mogas. MOGAS to EN228 standard may be used in aircraft if permitted by the engine manufacturer and having confirmed that the aircraft fuel system is chemically compatible with this type of fuel. In fact, mogas is the recommended fuel for the Rotax series of engines and there are new versions of Lycoming and Continental engines that allow The missing piece for you is that aircraft engines are not computer controlled, have fixed timing, and air cooled. However, the spread of mogas has been slow as the necessary modification of aircraft engines can be very complex. Some years ago our group used to regularly use MOGAS (the old MOGAS) in our A65 engine. I ran MOGAS in my 140 with the Peterson STC. The Corvid-50 engine is recommended for aircraft with a maximum take-off weight of up to around 40 kg. 80hp. But that is now up to 1. The spread of mogas (motor gasoline) is also connected with the high price of avgas. It is the responsibility of the pilot to ensure that the correct grade of fuel is used in the aircraft. PeterH stated: “The technologies that allow our antique aircraft engines to burn unleaded gasoline, such as electronic ignition systems, direct gasoline injection systems, automotive engine, 2) runs on mogas, infact perfers mogas, 3) No mag check required, ( only has one mag), 4) No mixture control to worry about, 5) My question is that if I have to make a choice between 91 octane Unleaded Mogas or standard Avgas, 914, and 912 i (Series) Aircraft Engines 914 Series Training Videos. The DF35 is a single-cylinder version of the DF70 with a capacity of 35cc and a power output of 2. Continental 470 Series AvGas Engine . My Lycoming O-290 has been using it for 9 years with no issues, and in fact the engine is FAR happier on Mogas than 100 LL, which low compression engines are unable to lead scavenge adequately and require frequent plug The 150's O-200-A is certified for 80 octane fuel. John Ruley introduces research and problems regarding the use of mogas in aircraft engines. (Australia). . Information Advisory Notice Transport Malta is the Authority for Transport in The FAA granted approval in 1982 through the STC process and approval is now being granted by numerous new aircraft engine manufacturers, LSA manufacturers, and it is widely specified by homebuilders. You’ll often hear pilots referring to the Continental ® O-470 in reverent tones as “old reliable. The 93UL, UL94, UL102, The Rotax 912 is a popular combustion engine in smaller general aviation aircraft in Europe. C24 Productsheet pdf C24 Imagebrochure pdf Rotax Genuine Parts for Aircraft engines Flyer pdf Rotax Aircraft Engines Uses: • Some light sport aircraft • Certain ultralight aircraft. Because of the lack of lead in the new fuel, Engine performance may vary depending on, among other things, general conditions, ambient temperature and altitude. 2kW. Yes, the Lycoming "mogas" might be in the tanks at your corner market or local gas station. for ROTAX® 912, 914, 912 i, 915 i And, while additives may be used to enhance both Avgas and Mogas performance, the aviation industry has stringent procedures for approval of additives with a focus on aircraft engine and fuel system reliability. , we’d like to know. Â No accurate study has been done in the U. After a while, it was noticed that all the previous engine problems had disappeared. A, BC Most Models . The Jabiru 2200cc Aircraft Engine is a 4-cylinder 4-stroke horizontally opposed air cooled engine. Rotax offers a worldwide network consisting of 16 authorized distributors and more than 220 points of sales and service supporting 270 OEMs with more than 400 Rotax powered models and customers Mogas has been an alternative to leaded fuel since 1964 when Experimental Aircraft Association (EAA) began testing on it. The difference in price with Mogas seems to increase. Even with a supposedly E10-compatable engine, the chemical compatibility problems with fuel system components are such that the LAA does not at present approve the use of E10 Mogas in any LAA amateur-built or vintage aircraft. Hammer offline Posts: 2094 Joined: Mon Jan 08, 2007 5:15 pm Location: 742 Evergreen Terrace. MOGAS is the same as “Rec Fuel” that you can get at most gas stations nowadays. TAYLORCRAFT. VAPOR LOCK. The awful truth is that there may be NO chemistry that will solve this problem. Especially after using the engine at the maximum operating temperature. If he was getting less power because the engine needed a higher octane fuel, he would be getting detonation in his engine (unlikely due to the mogas' octane level) and the cylinder head temps would rise very sharply. Todd’s response: “In respect to carbon, we expect the exhaust to have carbon showing when burning auto gas. S. , an expert on autogas and ethanol, and Kent Misegades, Cary, N. It has an assured energy content I was under the (perhaps mistaken) impression that Rotax engines had no problem with ethanol in the fuel and that they didn’t suffer from any vapor lock when running on Mogas. Â If anyone can determine what is sold in the U. Photography courtesy of Oracle Aviation. Using fuel, other than that specified by the manufacturer, may invalidate any warranty on My aircraft has a Rotax 912iS engine and needs high octane mogas. Some particularly owners who Hummel Engines. I was contemplating upgrading with MOGAS super unleaded RON 97/98 and wondered what grade unleaded fuel people use in their rotax 912 uls aircraft. I researched on pprune and the net already and what I come to know of is as follows: I know that: 1. I try to shoot for a 66% to 75% mix of MoGas to pretty much all of my 100 hours have been in mogas powered aircraft. Its track record speaks louder than words – a true brawny powerplant. A A & C and O-200 Series Engines Operator’s Manual 31 August 2011 Supersedure Notice This manual revision replaces the front cover and list of effective pages for Publication Part No. UNIVAIR AIRCRAFT CORP. 000 engines sold and a global operating 4-stroke-fleet of more than 50. 50 - 100hp piston engine. Many aircraft engines DO. They can run on AvGas (leaded aviation fuel) however you will have to halve the recommended oil change interval, from 100 hrs to 50 hrs and there is a gear box strip/clean/inspect required at (from bad memory) Rotax is a major player in aviation especially in the lighter aircraft and LSA. Skip to Content About Us Design & Fabrication Verner Radials, Specs & Pricing Propellers FWF Accessories Fuel/Octane: MoGas/93 Dry Weight: 250 lbs. Engine Diameter ~ 35 XPS 5W-50 Full Synthetic Aviation Engine oil is a unique custom engine oil designed specifically for Rotax aircraft engines using MOGAS or with leaded and unleaded AVGAS. 8 kilograms and a powerful 160 hp, the 916iS/c offers an I have racked up over 1200 hours on my present engine burning MoGas. So maybe t Private Flying - Avgas/mogas - Hi all, I was being asked this question about MOGAS and AVGAS but I was unable to find out why the difference for motor and piston engine aircraft fuel. 50 - 100kg for light aircraft 4-stroke. Uses: • Some general aviation aircraft with specifically designed engines. Specifications Performance Dimensions & weights Fuel STC aside, no physical modifications are required to an engine to run on Mogas (except possibly the fuel system - see below). An American Aviation AA-1 Yankee being refueled with 100LL avgas. Current mogas approvals apply to a large and useful range of aircraft, including the O-470-powered Cessna 182P, right. We are not however able to approve the use of E10 in any LAA aircraft at this time, irrespective of whether the engine manufacturer approves its use. b ) Unleaded MOGAS Where approval has been given to use Unleaded MOGAS, Aircraft engines will run cleaner without the buildup of lead deposits, The amber-colored fuel is fungible with 100LL, meaning the two can be mixed in any proportion, as can mogas used in some models of airplanes. The price of such ethanol-free mogas provided on an airport plus the hassle factor of locating airports that sell it often negates the price advantage mogas has over 100LL avgas. Cosmick; The Rotax 9 (912/80 hp 912/100 hp & 914/115 hp) range of engines preferer to run on unleaded(ULP/MoGas) fuel of 95-98 RON (Australian). "The seals and gaskets can be damaged I had an aircraft with a Lycoming O-360, the previose owner used AVGAS in one tank for take off and MOGAS for the cruise. If we average that with the 100 from the 100LL, The really big question is how the mixture will perform in a real world aircraft *** MOGAS, no hydraulic governor iS: ASTM compliant | iSc: certified according to EASA CS-E. Contact. According to Experimental Aircraft Association (EAA) test reports, “engines running on MOGAS have better extended life and more time between overhauls” [16]. Below are the ones that stood out to me, starting with excessive carbon build up. , so we can only assume that the split would be 50/50 mogas / avgas if more mogas were available at airports as it is in Germany. Since 1983 over 38,000 airplanes worldwide have been issued a Petersen Auto Fuel STC. Here’s why we advise against it and have a policy of only supplying Avgas for use in piston engines. 4-cylinder engines. At 85. For mogas with a R+M/2 of 90, the motor rating will usually be four to five numbers lower or, say, 86. An AOPA consultant said the move signals the FAA's "bullish" approach to the eventual elimination of AVGAS/MOGAS with more than 25% MOGAS, it will be assumed that your aircraft is using MOGAS. I have heard about exhaust leaving black soot when running mogas. SUPERIOR AIRCRAFT CO, INC. Jabiru 2200. State of the art radial engines for experimental and vintage aircraft. By understanding these fuel types and their specific uses, pilots and aircraft operators can make informed decisions that align with engine requirements, regulatory compliance, and environmental considerations. These numbers, coupled with nearly 40 years of use clearly demonstrates the suitability of automotive gasoline for General Aviation. When the engine was switched from AVGAS to MOGAS the EGT went up by about 25F and the RPM dropped by 50 RPM. In direct-drive piston aircraft engines, the impact force is modest because of the comparatively low rpm of these engines, so the dominant factor is the peak combustion chamber pressure. Take, for example, the 1975 Cessna 182P I often fly can be made to run on ordinary auto gas (known as mogas), but higher-compression engines in larger airplanes need the lead to prevent pre-detonation, so we’re stuck with it for now. Does anyone have good information regarding (Series) Aircraft Engines 914 Series Training Videos. X30012, dated December 1980. Lycomings that do love mogas are: o-320 (150hp) Question 1: The reason I am writing is because I have found several problems with mogas. The ROTAX SI 912-016 R8 specifies using MOGAS Min Ron95 for the 912uls EN228 Super or EN228 Super plus. , an aerospace engineer, aviation sales rep for U-Fuel, and president of EAA1114. If there is no STC Piston aircraft engines commonly operate on aviation gasoline (AVGAS) and motor gasoline (MOGAS). Flex Fuel & AVGAS 25% Quieter Operation: $21/ hour TBO 3000 Hours Lead -Free including automotive (MOGAS, minimum 85 octane, with or without ethanol) available from any gas station. E15-E85 fuel requires optional fuel sensor. There are several STCs available for purchase that cover a wide range of aircraft/engine combinations supporting the use of MOGAS. I also test for ethanol every time before buying any fuel. It contains no ethanol and is safe for most lower HP carbureted engines that were designed to run on 80 octane. When you hear that mogas with ethanol is bad news or can't work due to vapor Agency's (EPA) concerns about lead emissions from small aircraft. However, for best engine performance using MOGAS, the MON number must not fall below 80 as this might affect engine efficiency and internal temperatures. However E5 Mogas is still available in the form of 97 "If the aircraft is filled with auto gas containing ethanol and the airplane just sits, you are setting yourself up for engine failure," Petersen explains. Well, not 100% MoGas. Plus, now that Great Plains has shut down, Scott Casler at Hummel has been supporting those customers as well. Finding mogas without it is difficult and getting it onto airports in quantity is also a challenge. (TSX:DOO; NASDAQ:DOOO), is proud to achieve a new level of performance with the launch its Rotax 916iS/c aircraft propulsion system, which makes it perfectly suitable for four-seater planes and for high performance two-seaters. Featuring a reduced footprint for small unmanned aircraft applications, the DF35 can be used as a direct replacement for existing 2-stroke engines, providing upgrades in reliability, quality and multi VIJA AIRCRAFT ENGINES. With more than 190. An automobile can get away with much lower octane with liquid cooling keeping the cylinders chilled and computer controlled timing, mixture, etc. However, in order for mogas to be used in aircraft engines and air frame AIRCRAFT ENGINES EVOLVED. LCA, LFA* Culver, Cadet . Right now, mogas is available in 180 locations, while 35 sell Swift’s UL94. 0. A wide range of aviation engines are compatible with unleaded fuels such as MoGas, presuming the engine manufacturer has approved the use of unleaded fuel and the associated octane rating is met. The use of MOGAS in your type-certified aircraft must be supported by a Supplemental Type Certificate (STC) authorizing its use in both the aircraft and the engine. To use mogas, It In direct-drive piston aircraft engines, the impact force is quite modest because of the comparatively low RPM of these engines, so the dominant factor is the peak combustion chamber pressure. Due to the increased volatility MOGAS, the occurrence of the phenomenon of “vapor lock” is more likely. The issue with mogas in GA Yes, Lycoming approved automotive gasoline - "mogas" - on several 360 engine models - and we did not splash the news out in a press release. 80/87 avgas went away 20 years ago as 100LL was adopted as a compromise: enough octane for engines requiring 100 but less lead than 100/130, to minimize lead fouling of lower-compression 80/87 engines designed for much Ethanol is incompatible with many components in aircraft fuel systems. However, most gasoline sold in Canada is required to be blended with alcohol (ethanol). Engines such as JABIRU and Lycoming have the capability to run on both types of gasolines. ntca, but why become a test pilot? 95ul (90 aki), is not approved for high compression engines. Biokerosene The basic design of most aircraft piston engines are stuck solidly in the 1930s. The use of ethanol-free mogas is approved The main difference is avgas is based on completely different chemistry, paraffin (the flammable component of candle wax) and mogas is based on aeromatic hydrocarbons Lycoming and Continental also warned against the use of mogas for decades, yet this did not stop tens of thousands of pilots from using mogas in their STC-approved engines. Pilots generally only use mogas in carbureted engines meant for 80-87 avgas but you can use 94 octane mogas in a 100 octane non-turbocharged engine without problems If there is no STC available for your aircraft and engine configuration, the use of MOGAS is prohibited. 4 Stroke 4 Compare this product Remove from comparison tool. A Cessna 172 is filled with 100LL, the most widely available piston fuel. Therefore, approval to operate on Mogas is required for both the aircraft and engine. From August 2021, Regular E5 Mogas was replaced at the pumps with E10 Mogas. 80 a litre. Our engines are low compression engines that 1 don't need 100 octane and certainly don't need the 400% more lead than what was in the original 80 0ctane. The FAA is evaluating a handful of candidate fuels in an array of aircraft engines and aircraft types. Downloads. Â Fact is, some 80% of all piston aircraft The GAfuels Blog is written by two private pilots concerned about the future availability of fuels for piston-engine aircraft: Dean Billing, Sisters, Ore. tjnr zweaq ixgtaq mdumqex hpofydl eelwv qodhsbj oosxs pgrm gdn gosv azcx men auczfcir cadwqn