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mz(at)cariama.nl
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 Posted: Thu Nov 27, 2008 11:55 am Post subject: Rotax 912UL perfermance and fuel figures |
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[color=red:f3ed5c1dbe]QUESTION TO OWNERS OF A EUROPA TRI-GEAR EQUIPPED WITH A ROTAX 912UL ENGINE[/color:f3ed5c1dbe]
[size=9:f3ed5c1dbe]Others: don't even bother to read this, you have other interesting things at hand I might hope  [/size:f3ed5c1dbe]
The last couple of months I have been quite busy looking to buy a ready Europa, which last week resulted in me having bought the G-BWON, a 1997 Classic Tri-Gear currently owned by David Joyce and Bob Hitchcock. The G-BWON is equiped with a Rotax 912UL with just over 300 hours on it.
In the OPS manual for the ROTAX 912UL there is a table showing the relation between engine power setting, engine speed, performance, torque and manifold pressure (in 10.1.1)
Unfortunately I can't show HTML tables here, so I will have to go with what I can do: the following lines show an extract of that table, the fields shown are:
[b:f3ed5c1dbe]Engine Power Setting - Engine speed (rpm) - Manifold Pressure (in.Hg)[/b:f3ed5c1dbe]
Take off performance - 5800 - full throttle
Cruising power - 5500 - full throttle
75% - 5000 - 27.2
65% - 4800 - 26.5
55% - 4300 - 26.3
[color=blue:f3ed5c1dbe]What I would like to find out in preparation for the ferry-flight from the UK to Holland, are the [b:f3ed5c1dbe]realistic[/b:f3ed5c1dbe] numbers for [b:f3ed5c1dbe]fuel burn[/b:f3ed5c1dbe] and [b:f3ed5c1dbe]indicated air speeds[/b:f3ed5c1dbe] that go with these numbers.[/color:f3ed5c1dbe]
Highlighting 'realistic' is because from experience I know that in general the real numbers turn out to be somewhat more 'negative' than what is listed in the manuals.
Also, flying the 2nd leg of the ferry (EGMH-EHHO) with two 200lbs+ people on-board limits the amount of fuel to just about the theoretical 'can-do' with a 30 min. reserve and wind coming from the 'wrong direction'.
Not having sufficient assurance that the numbers I used for this planning (16 ltr/hr (at) 115 KIAS), I feel this planning is just too tight (also at the time of the ferry my hours on the plane will be very limited).
I am therefore looking for as much input on the subject as I can. I know I could fly (at) 97KIAS for best economy, but speed is of essence to do the ferry in one day, so I would really like to do it with 110+ KIAS.
Therefore my question:
Would you please share your real-life fuel burn and air speeds that go with above numbers, so that I can better judge whether I should insert a 2nd stop about halfway Manston - Hoogeveen.
Thanks in advance!
Marcel
Visit - www.EuropaOwners.org
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frans(at)paardnatuurlijk.
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| Posted: Thu Nov 27, 2008 2:12 pm Post subject: Rotax 912UL perfermance and fuel figures |
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zwakie wrote:
| Quote: | Would you please share your real-life fuel burn and air speeds that go with above numbers, so that I can better judge whether I should insert a 2nd stop about halfway Manston - Hoogeveen.
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They sell MOGAS in Midden-Zeeland, about halfway the trip from Manston
to Hoogeveen...
--
Frans
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mz(at)cariama.nl
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| Posted: Thu Nov 27, 2008 2:23 pm Post subject: Rotax 912UL perfermance and fuel figures |
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If I decide I do need a 2nd stop, EHMZ would be the place of my choice
(as you point out, about halfway AND mogas - also, why carry immersion
suits longer than required? )
| Quote: | They sell MOGAS in Midden-Zeeland, about halfway the trip from Manston
to Hoogeveen...
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davidjoyce(at)doctors.org
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| Posted: Fri Nov 28, 2008 3:30 am Post subject: Rotax 912UL perfermance and fuel figures |
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Marcel, I have toured around Europe quite a bit with G-BWON, (+ 2 pax, +
full fuel, +luggage), and we have managed 3 hr legs at 110 kts with a good
reserve. I wouldn't personally be too troubled about taking off with full
fuel even if that put your take off weight a touch over theoretical maximum,
as long as C of G is within limits. Plenty of Europas have shown that they
still fly pretty well like that. Personally (but with a 914), I manage about
13 litres/hr at such speeds but trigears do use a bit more. I am sure that
Bob Hitchcock could give you accurate fuel burn figures for sensible cruise
speeds.
Incidentally I can confirm that Midden Zeeland is a nice airfield
to stop at & refuel, if you need to, but my feeling is that you would
certainly not need to. The route via Deal, Dunkerque, Zeebrugge, Breskens,
Zaltbommel to Hoogeveen is about 250 Nm and you should be able to do that
with a 30 kt headwind or worse!
Regards, David Joyce (the other one, not the one you bought your plane from
!), G-XSDJ
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wooburnaviation(at)google
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| Posted: Fri Nov 28, 2008 7:23 am Post subject: Rotax 912UL perfermance and fuel figures |
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Marcel,
I had a 912 UL trike, and support what David Joyce (G-XSDJ) said. I would recon on doing that trip in a single tank of fuel, even with headwinds. I used to fly longer distances at 107 KIAS, as that seemed to be the "sweet spot" in terms of minimum vibration, and I have a lot of "mechanical sympathy". I was burning 15 litres an airbourne hour at gross weight (1370lbs)/625kg) using unleaded petrol.
Hope that helps, and good luck with the trip.
Ps In the past I have diverted to Le Touquet (LFAT), Ostend (EBOS), and Brussles Charleroi (EBCI, I think). All have been more than helpful, and not to expensive.
Dave Buckley
2008/11/28 David Joyce <davidjoyce(at)doctors.org.uk (davidjoyce(at)doctors.org.uk)>
[quote]--> Europa-List message posted by: "David Joyce" <davidjoyce(at)doctors.org.uk (davidjoyce(at)doctors.org.uk)>
Marcel, I have toured around Europe quite a bit with G-BWON, (+ 2 pax, + full fuel, +luggage), and we have managed 3 hr legs at 110 kts with a good reserve. I wouldn't personally be too troubled about taking off with full fuel even if that put your take off weight a touch over theoretical maximum, as long as C of G is within limits. Plenty of Europas have shown that they still fly pretty well like that. Personally (but with a 914), I manage about 13 litres/hr at such speeds but trigears do use a bit more. I am sure that Bob Hitchcock could give you accurate fuel burn figures for sensible cruise speeds.
Incidentally I can confirm that Midden Zeeland is a nice airfield to stop at & refuel, if you need to, but my feeling is that you would certainly not need to. The route via Deal, Dunkerque, Zeebrugge, Breskens, Zaltbommel to Hoogeveen is about 250 Nm and you should be able to do that with a 30 kt headwind or worse!
Regards, David Joyce (the other one, not the one you bought your plane from !), G-XSDJ
[quote][b]
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