Hey guys. I'm in another country. FAA rules do not apply here. Lots of freedom here unlike in the USA. I have a ferry flight coming up in a Bell Medium and am having some fuel issues. I fuel out of barrels and I have a 320 nm leg tomorrow. Have any of you found if you go to idle with one engine and 100% (or so maybe a touch less) on the other, it saves you some quantifiable fuel? Looking for experienced pilots to help me out. 

Forget the FAA, what does the rfm and manufacturer say? That would be your first line of defense if something goes wrong. 

Good call. Permissions for Single Engine Flight aren't really discussed in there. Some of those limits are suggestions and others are pretty hardline. 

turbine engines are most efficient at max power.  If you could shut one down and maintain normal cruise speed you would gain distance. The more you go below normal cruise the less you will gain. Putting one at idle will hurt you. The engine will be burning fuel and doing nothing. 

So are you saying that the idling engine should be shut down to provide maximum distance?

Yes. An engine at idle is just wasting fuel. You need to shut one down to gain anything worthwhile.  
do the guy who said fly high you are correct if the aircraft can do it efficiently. I flew the dauphin. It did very well above 9000.  The agusta 109 would actually do worse above around 7000 due to loss of efficiency of the rotor system.  Fuel burn went down but speed dropped way down. 

Just wondering here, those of you that shut one engine down on long flights, are you logging different times between engines in your logbook? 

Winds permitting, fly high.

on the pedals bro

Hi, Not a pilot but I probably could be if I wanted too; it looks easy enough.....

Anyhow - would it help to fly really high up gradually let off the gas to where it keeps flying, then maybe do one of those extended autorotations, add throttle to climb and repeat? Seems like there's enough sky out there to be feasible..

Didn't the early 206 A or B's have a M/R range 95 to 100%. so you could beep the rotor down to save fuel?

Performance  I have a ferry flight coming up in a Bell Medium and am having some fuel issues. I fuel out of barrels and I have a 320 nm leg tomorrow. Have any of you found if you go to idle with one engine and 100% (or so maybe a touch less) on the other, it saves you some quantifiable fuel? Looking for experienced pilots to help me out. 

"Bell medium" as in 212/412 or a 222/230? Those old engines ain't economical in idle. The RFM is your friend in this case- performance charts especially. Been decades since I had to calculate this, but here goes:

I'd copy and magnify the chart to do this (on paper in them old days)

RFM power chart, big bulge.

From the lower left, a line on a tangent to the power curve is your best shot, should give you a ground speed or power setting.

And you have to factor in the atmospherics, winds especially.

I'm a nervous sort but I'm also an old fart. I would go a long way around to have a comfortable fuel stop(s) on any leg...

https://www.aopa.org/news-and-media/all-news/1994/july/pilot/gemini-st

Just throw a couple of drums of fuel in the back seat.  Then half way through the flight take a pee break and tranfer the fuel.

Just turn them both off and pull the left handle all the way up.

people on here can't see this is a troll from a thousand miles out 

maybe, maybe not. it has been done before and I won't say who or where, but if that crusty old aviator is reading this, I know he is laughing as he takes another sip of beer. 

I guess the old retards are just as dumb as the new retards

Are you one of the old farts or young retards?

Years ago a Navy SH3 crew tried this stunt during a cross country flight to skip a fuel stop. They were doing ok until the remaining engine quit. Restarted while in an auto. Recovered. One of the crew turned the pilots in. Idiots. 

lol

flying along in a sea king on one engine to save fuel when the engine quit! we entered an auto and got the other engine started and flew away! of all the things that never happened, this never happened the most. lol  I'm sure the crusty old aviator smiles and sips his beer while sitting in his own excrement. 

OK Mr. Junior Navy wannabeeee.......Captain........

discussion.  Some types have max se speeds.  Depending on winds use LRC TE at the altitude that fits best TAS and play the ground speed.  Choose a conservative PNR.  If in a head wind use as much TE power as possible at favorable altitude.  Not a fan of SE ferry flying.

This really winds you up doesn't it? I guess when you haven't done anything except fly Robbie's the jelousy consumes you. 

a response.  Flex ur own imagination for a change, u might gain something. 

a situation where you would be dumb enough to fly a twin with two good engines just on one and not coming up with anything. you got any brilliant ideas, I'm listening. 

are possibly little experienced and narrow minded - have a look over the next hill.  Might see something.

why don't you enlighten me. pretty simple question.

Do ur own homework!

you got nothin

it was the first time a helicopter flew carrier to carrier non stop across the us.  The did shut down one engine as soon as they could.  There was some concern about full power on one input shaft. They did not run out of fuel.  Look it up, it is a true story.

they sure flew that sea king around a lot on one engine lol

full power means max continuous SE or did Sikorsky approve a one-off; not that they'd have to.  SH3 not a fun autorotation machine.