Mogas, 150kts

Let'sgoflying!

Let'sgoflying!

Touchdown! Greaser!
Joined
Feb 23, 2005
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Dave Taylor
List capable aircraft.
No other restrictions except the two in the title.
 
Any of the RV* series, Beech 18, and the Debonaire are the ones that come to mind. Edit - Tailwinds can handle this mission too.

*No high compression engines, please.
 
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Some of the Debonaire series.
 
Petersen's website lists the Apache 150 and 160 as eligible for the mogas STC (I know, I know, not really 150 KTAS airplanes). But though the 235 hp Lyc. O-540-B1A5 engine is listed, the Apache 235 is not. :dunno:
 
a35 to the H35.

My -35 can do 150 KTS but I'm not operating per POH.
 
brian];1953771 said:
a35 to the H35.
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Not including the H. The G35 is the latest Petersen handles.
 
Wish I could find MOGAS near me. Sounds like a bunch of guys have built E10 capable fuel systems into their RVs. That will probably be my plan.

I spoke with UL engines, and their offerings cans use E10, as can the Rotax 912 series, I believe. That offers up almost all the LSAs and smaller experimental aircraft, although not sure how many of those can get up to 150kts.
 
PilotRPI said:
Wish I could find MOGAS near me. Sounds like a bunch of guys have built E10 capable fuel systems into their RVs. That will probably be my plan.
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Thats the problem. Our RV-9a will run mogas but unless I get a system to run fuel to my home airport, then onto the airport grounds, then fuel the plane under the nose of the FBO (thus not patronizing their fuel service), no mogas is available. Away from home at most airports I have flown into no mogas is available there either.

Both our RV and Lancair will do 150 kts but the Lancair has 10:1 pistons so as I understand mogas is not suitable due to detonation concerns with lower octane.
 
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FORANE said:
Our RV-9a will run mogas but unless I get a system to run fuel to my home airport
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How much fuel does that RV's-9 hold? You can get carried away and build a fuel trailer like Larry did but I find that 5 gallon cans do just fine for my 182. I regularly bring 30 to 40 gallons to the hangar and fuel while I'm preflighting...it really doesn't cost much if any time.

Of course, it's hard to find 5 gallon jugs w/o safety nozzles these days. I have the older, self venting style and they're just fine, in fact, they're great because they shut themselves off when the tank is full.

VP Racing fuel jugs don't have the safety nozzle.
 
Henning said:
225hp Beech 33, Spartan Exec, Beech 18, any number of 160+HP experimentals.
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While you can indeed get the MOGAS STC for the Twin Beech, I've been told that you should at least run at least 25% Avgas mixed with it and not straight MOGAS.

Also, you might want to talk to your engine shop first. I don't know about Covngton, but apparently running MOGAS in a Tulsa engine voids any warranty.
 
Fearless Tower said:
While you can indeed get the MOGAS STC for the Twin Beech, I've been told that you should at least run at least 25% Avgas mixed with it and not straight MOGAS.

Also, you might want to talk to your engine shop first. I don't know about Covngton, but apparently running MOGAS in a Tulsa engine voids any warranty.
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I haven't seen anyone having problems.:dunno: 1340 didn't seem bothered at all by 92 unleaded either.
 
timwinters said:
How much fuel does that RV's-9 hold? You can get carried away and build a fuel trailer like Larry did but I find that 5 gallon cans do just fine for my 182. I regularly bring 30 to 40 gallons to the hangar and fuel while I'm preflighting...it really doesn't cost much if any time.

Of course, it's hard to find 5 gallon jugs w/o safety nozzles these days. I have the older, self venting style and they're just fine, in fact, they're great because they shut themselves off when the tank is full.

VP Racing fuel jugs don't have the safety nozzle.
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18 gallons per wing.

You can discard the garbage gas nozzles and replace them with these which work great:
http://ezpourspout.com/
http://www.ruralking.com/ez-pour-replacement-spout-kit-10050.html
 
Fearless Tower said:
While you can indeed get the MOGAS STC for the Twin Beech, I've been told that you should at least run at least 25% Avgas mixed with it and not straight MOGAS.
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Most people that I know with MOgas STC rarely have 100% in their tanks. Sure there are a few, with Mogas local that never leave the local area, but most are a mix most of the time...
 
A lot of engines run good on Mogas. For instance the same io-360, 200hp with high compression Pistons 8.7 to 1 and high timing 25btdc run fine on mogas if operated outside of the redbox. Actually they purr with Chts 300-325. In this instance its experimental but it could be the same engine in a mooney m20j or a arrow. The problem is there is less margin for error but climb full rich then transition to target egt method for remainder of climb and it will Purr like a kitten. Actually I think if cruising at 75% power or less it actually runs better on mogas.

The challenge is it is next to impossible to get a "certified" airframe AND power plant approved for mogas. There is the specific vapor pressure of the mogas that varies from state to state and in most cases winter to summer and the operating limitations that would need to be imposed due to lower octane.

2 things would solve all the problems. 1. A modern fuel system like a auto uses where full is pumped from the tanks not sucked (for vapor pressure concerns) and liquid or semi-liquid cooled cylinder heads to bring Chts down to the 190-250 range where detonation margins are increased.

Ok back to the op question a m20j will cruise all day on mogas at 150+kts but under the current bureaucracy don't plan on doing this legally any time soon. So in the mean time we will cruise around burning a fuel with excess octave (lead) that is only needed for a small percentage of the flight if at all, that plugs up our engines (lead bromine sludge) and causes a slew of other problems such as low compression due to stuck rings from excessive lead and fouled plugs at a cost of x2 market price for mogas until a day where the politicians will allow innovation back into the aircraft engine market.


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BTW... While Team Tango had my plane at Oshkosh, they filled one of the tanks with Swift Fuel's 94UL. A comparison test was done on the way back from OSH. An hour running 100LL and an hour running Swift. Other than a slight drop in temps, there was no noticeable difference in performance.
 
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