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Depends on the plane and it should be a test the builder does along with fuel flow, and if you have dual pumps in series test that each pump can pump through the other and that if they are running at the same time that they don't set up resonance in the fuel line and just make bubbles. BTW in your plane it is a couple of ounces, but once the tail comes down on landing you won't be able to taxi.;)Rick DyerFormerly N58WH
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I believe William sells a Rotec similar to the Ellison. I'm planning to use it on mine unless I hear reasons not to.
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Solution could be a fuel pressure regulator downstream from the header tank. It was an issue on the muscle cars (before digital injection systems) in the day too.. high pressure for supercharging or Nitrous injection totally required, but when off the pedal just cruisin or at idle the pumps would richen the carb(s) to the point the exhaust valves would eventually coke up and that is not a good condition to have.Best to check with William on his experience with the Marvels. I am considering the Ellison but still on the fence about that decision. I have some questions still on that system.
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Charlie.. verify with William but the Corvair use Marvel was designed for gravity.. and the boost pump could be lifting the needle off the seat enough to richen the mixture. Float setting is a bit picky on carburetors. You won't be running lean but sure enough the plugs will be adding carbon faster. It wil be issue with my aircraft too.. so I am interested in your findings.Vern
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Fred---------------- If the fuel pickup is in a depression on the bottom of the tank and the airplane is level, there should be almost no fuel left.
If you are using the standard Dragonfly fuel set up you will hear the Faccet fuel pump chatter when you are sucking air from the main. This means you only have the header left.------------------- Chris
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Charlie----------- I realize you thought of this, but the needle seat may not be sealing quite right , but , digging back into the old brain cells, isn't the mixture contolled by letting air into the float bowl? It may be your float level setting is off or the air inlet isn't working.
I could be, and probably am wrong.
I am using a Posa carb with good results. I modifes my needle to Sonex carb standards and works well
The carb used in the Sonex is also very good. Both are gravity only.
I have a carb for the Sonex, that needs to be worked on to work, so, I hope your MS works, but if not and you decide on a different path give me a buzz. Take care------------ Chris
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Don,Thanks for the info. I have never had a Marvel Schebler carb before. The Ellison 3A vapor-locked in 2016 resulting in my forced landing.Little stumbles really get me excited these days. I have been thinking the needle and floats might be a issue.Regards,
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Charlie,
Too long ago to remember what carburetor I had, but my electric pumps (serial) generated about 3.5psi, bypassing the header tank.
With gravity fuel feed, the floats filled and the needles sealed just fine during idle and turn-up.
However, with the pumps running, the vibration of the engine at higher rpm dislodged the floats periodically causing an over-rich condition.
Selective float needle seats material solved the problem.
MS Carb Overhaul Manual: https://www.expaircraft.com/PDF/marvel-schebler-OH.pdf
Regards,
Don Stewart
Prescott AZ -
Does anyone know how much unusable fuel there is in a standard Dragonfly fuel cell (16gallon tank)?
Thanks!! -
Chris,Yes! This poor old plane 950 hrs has gone through 2 canards and 3 engines. So still tuning to do.One thing I cannot figure out is the MS carburetor which is float controlled has a big mixture change between gravity flow (20 gah) and 3psi (15gph) boost pump. The carb is rated 0.4 to 6 psi but really richens up with the pump on.Regards,
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Well done Charlie. Don't you love it when it all comes together.----------- Chris
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Sounds like your making progress, too bad you weren't able to make an exit from Ogden this year.
How is Bob's plane doing? -
Spud my old friend!,How nice to hear from you! You can see in the video it rolls to the left, it was controllable and I countered it with trim. Pretty draggy configuration. The pitch was to fine good climb but I can over speed the engine in level flight. There is a big change in mixture between gravity and boost pump that I am not understanding why on a needle and float carburetor? Wheels are toed in 1.5 degrees per side.It is going to get cold here and I am going back to Az and fly my Tri-Pacer for the winter. I will trailer the Dragonfly to Benson Az and reassemble for flight test in the spring.Wishing you well,Charlie
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Congrats Charlie on getting your DF back in the air!!Very much will enjoy further updates and numbers on your progress. Love the videos also.Very Best Regards, Spud
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Kevin,I am sorry to report I will not be able to attend this year. I will be moving the Dragonfly next spring.Regards,
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Way back in the 90’s I elected to not test my Dragonfly at North Las Vegas for the same reasons. Congested airspace, too many houses and the empty desert was actually full of car-sized rocks. Tested it at Chino and loved that airport.
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Hats off Charlie!! Its good to know your in the air again. Agree..having B airspace just adds multi tasking efforts. I would like to know the few "go doos"..Anyway.. all smiles for you!!Vern
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I flew my Dragonfly first flight with the 3.0 l Corvair. I had a few squawks but I have decided KOGD is not the place to do my test flying. Tower controlled pushing ATP students around the area. TPA is 5200 MSL but you have to stay under 5500 MSL west of the freeway. Eats you can go up to 7800 before class B airspace. All urban houses everywhere.
I posted the short go pro version.
My you tube channel -
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Hi everyone,just a quick update from the Netherlands: https://www.youtube.com/watch?v=ut07ZtMuOro&t=13s. We will hopefully start taxi testing in two weeks.
Regards,Mark -
Allright, thank you for your quick response!Van: main@DragonflyList.groups.io <main@DragonflyList.groups.io> namens dflybldr via groups.io <tebhall@...>
Verzonden: zondag 28 augustus 2022 18:32
Aan: main@dragonflylist.groups.io <main@dragonflylist.groups.io>
Onderwerp: [Extern]:Re: [DragonflyList] Stick aft while parked?LET OP: Deze e-mail komt van een afzender buiten Inholland. Wees voorzichtig met het klikken op links en het openen van bijlagen.
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Yes. I have a little orange block I put in the space forward of the stick when it is full aft. -
Yes. I have a little orange block I put in the space forward of the stick when it is full aft.
Re: Unusable fuel in a Dragonfly
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