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Eugene Zimmerman
Joined: 10 Jan 2006
Posts: 392
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 Posted: Tue Jul 24, 2007 7:09 pm Post subject: Fuel Efficiency ? was Re: Small Cross Country |
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Thanks lucien,
That is very good fuel efficiency. Sounds like you have your engine
and prop dialed in right.
On Jul 24, 2007, at 10:13 PM, lucien wrote:
| Quote: | My stats:
FS II 98' model
503 DCDI 2v, 3.47:1 C box w/clutch
Warp drive 68" 3 blade
empty weight 440lbs.
Fuel burn at sea level at about 60mph was around 3gph. At my new
altitude of 7000', it's slightly less than that just eyeballing it.
Probably around 2.8gph...
LS
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Wed Jul 25, 2007 8:38 am Post subject: Re: Fuel Efficiency ? was Re: Small Cross Country |
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| Eugene Zimmerman wrote: | Thanks lucien,
That is very good fuel efficiency. Sounds like you have your engine
and prop dialed in right.
On Jul 24, 2007, at 10:13 PM, lucien wrote:
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Actually, I don't quite understand why its even that good. The plane came out kind of heavy at 440lbs empty weight. I suspect it's the C box and clutch, for which the builder had to add ballast to the nose to get the W&B to come out correctly.
I had considered at one point going to the B box and a 2-blade prop and removing the ballast. That would save around 25lbs...
But the plane has enough wing area that that probably wouldnt make much difference. But I don't want to give up my clutch and my big honkin warp drive prop.......
But I wouldn't be surprised if a B box and 2-blade IVO wouldn't actually give me slightly better efficiency.....
LS
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LS
Titan II SS |
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Eugene Zimmerman
Joined: 10 Jan 2006
Posts: 392
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| Posted: Wed Jul 25, 2007 9:31 am Post subject: Fuel Efficiency ? was Re: Small Cross Country |
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lucien,
Any thing at this point that improves your fuel efficiency will
probably hurt your climb performance or seriously compromise engine
reliability, except perhaps an in flight adjust prop.
60/65 mph (at) less than 3 gal. per hr. is excellent for your plane and
engine.
Gene
On Jul 25, 2007, at 12:38 PM, lucien wrote:
| Quote: |
Actually, I don't quite understand why its even that good. The
plane came out kind of heavy at 440lbs empty weight. I suspect it's
the C box and clutch, for which the builder had to add ballast to
the nose to get the W&B to come out correctly.
I had considered at one point going to the B box and a 2-blade prop
and removing the ballast. That would save around 25lbs...
But the plane has enough wing area that that probably wouldnt make
much difference. But I don't want to give up my clutch and my big
honkin warp drive prop.......
But I wouldn't be surprised if a B box and 2-blade IVO wouldn't
actually give me slightly better efficiency.....
LS
--------
LS
FS II
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lndc
Joined: 15 Jan 2006
Posts: 9
Location: northern MN
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| Posted: Thu Jul 26, 2007 12:34 pm Post subject: Re: Fuel Efficiency ? was Re: Small Cross Country |
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I have a buddy that claims the same with a 582. My 377 on an original FS got 3/hr.
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