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Fuel Flow at Cruise
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ElleryWeld(at)aol.com
Guest

Posted: Fri Jan 26, 2007 9:52 pm Post subject: Fuel Flow at Cruise

2 Blade prop Better all around Climb and Cruse  

 

 Ellery

 do not archive  [quote][b]

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tkrolfe(at)usadatanet.net
Guest

Posted: Sat Jan 27, 2007 7:03 am Post subject: Fuel Flow at Cruise

DAquaNut(at)aol.com (DAquaNut(at)aol.com) wrote:  	  Quote: 	
		              In a message dated 1/26/2007 8:38:35 A.M. Central Standard Time,   tkrolfe(at)usadatanet.net (tkrolfe(at)usadatanet.net) writes:

    	  Quote: 	
		  

 Ed,

     

 What's your hurry?  I like to fly slow and gawk, that's why I built a FireFly ultralight.  I normally cruise at 5,000 to 5,200 rpm which translates into 50 mph to 52 mph.   Sometimes at 4,800 rpm if interested in a particular place and want to enjoy.  I can go faster, but don't need to.  Flying for pleasure, not to get somewhere.  This is with an open cockpit, probably could do a little better with a full enclosure.  Also, the number of takeoff's really increases the fuel burn rate.

     

 Fuel consumption goes up in mid summer with the loss of air density.

     

 Terry -  FireFly #95

           	  Quote: 	
		         Terry, 	
   	
        When you said you could go 120 miles before refueling, I assumed you were flying to get somewhere. So you figure if I held my RPMS to 5200 I should be able to go 100 miles on a tank? I havent tried going that slow when going cross country!

    	  Quote: 	
		  

           Ed (Firefly #62) 	
 	
 

 Ed, Didn't mean to come off as argumentative, just informative!  When I said I could go 120 miles before refueling, I didn't mean that I do.  I was translating my fuel burn into continuous miles if I didn't put down as I usually do.  My longest flights so far have been in the 50 ml. range.  Have a fellow flyer who keeps pushing me to go further which I will do.  Have the luxury of beautiful Lancaster county, PA to fly over with it's many Amish farms.

 

 What I was trying to convey is that I don't have the need for speed, but do enjoy the performance level of the FireFly, especially the climb rate.  Another benefit to keeping rpm down is the life of the 447.  622 hr.'s and still purring with no tear down performed.  "Now I know I will hear about that" as it is the common wisdom of this list that you have to tear down regularly and de-carbon and so on.  Luckily, my friend and fellow kolb flyer is a 2 cycle guru and repairman with much experience and I follow his lead on maintenance.  I expect maybe 1000 hr.'s before tear down.  Not suggesting anyone else follow this program, but I do know that the Rotax engine isn't the fragile little thing that many make it out to be.   It had powered many snowmobiles and jet ski's many miles before being used by us on ultralight's.  

 

 As far as you being able to go 100 miles on a five gallon tank of gas, that should be quite possible depending on your gross weight and air density and not doing several takeoff's.  Being in Texas, I assume that your average temperatures when flying is higher than mine and your therefore your fuel consumption will be higher.

 

 Terry - FireFly #95

     [quote][b]

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DAquaNut(at)aol.com
Guest

Posted: Sat Jan 27, 2007 8:44 am Post subject: Fuel Flow at Cruise

In a message dated 1/27/2007 9:04:22 A.M. Central Standard Time,  tkrolfe(at)usadatanet.net writes:

  	  Quote: 	
		  

What    I was trying to convey is that I don't have the need for speed, but do enjoy    the performance level of the FireFly, especially the climb rate.  Another    benefit to keeping rpm down is the life of the 447.  622 hr.'s and still    purring with no tear down performed.  "Now I know I will hear about that"    as it is the common wisdom of this list that you have to tear down regularly    and de-carbon and so on.  Luckily, my friend and fellow kolb flyer is a 2    cycle guru and repairman with much experience and I follow his lead on    maintenance.  I expect maybe 1000 hr.'s before tear down.  Not    suggesting anyone else follow this program, but I do know that the Rotax    engine isn't the fragile little thing that many make it out to be.      It had powered many snowmobiles and jet ski's many miles before being used by    us on ultralight's.  



As far as you being able to go 100 miles on    a five gallon tank of gas, that should be quite possible depending on your    gross weight and air density and not doing several takeoff's.  Being in    Texas, I assume that your average temperatures when flying is higher than mine    and your therefore your fuel consumption will be higher.



Terry -    FireFly #95

 	  Quote: 	
		  

	
	


 

              Terry,

     What you are saying now is more in line with what I am  experiencing with my Firefly. I dont think I could go more than 60 mi without  refueling.  I do know that it burns a lot less fuel just taking it easy ,  flying slow and enjoying the scenery. I was about ready to get me a  Tennessee  wooden prop, but it sounds like there is not much difference  between that and my 66' 2 blade Ivo.

  

              Ed  (FF #62 In SOGGY  Houston)

  [quote][b]

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