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Most fuel efficient twin?

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Old 1st Mar 2012, 15:33
  #21 (permalink)  
 
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Also the limiting speed for the gear is 90kts.
Yikes, missed that one - that's an amazingly low number.

(in comparison the DA42 gear can be extended right up to Vne (= 194 KIAS) and retracted at 156 KIAS - pretty good)

Last edited by Hodja; 1st Mar 2012 at 15:51.
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Old 1st Mar 2012, 15:48
  #22 (permalink)  
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Perhaps a little thirstier but a really lovely machine if you're in Cessna country was the Cessna 310R - not the Q. You'd need to check the log books for undercarriage maintenance on those. It's a weak spot but then it's a six seater and unlikely to have been on a training licence.
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Old 1st Mar 2012, 16:43
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I would second the choice for a twin comanche.
You can find them really cheap nowadays. Expect to pay around 80.000 US for a really nice one with low hour engines.
They're great to fly and really give you a lot of speed and joy for 16 GPH @ 160 kts.
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Old 1st Mar 2012, 16:46
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I would agree with the BPF and CC. A look at an older "old school" twin such as 310 or Baron could well be a good idea. A nice low hour Baron would be attainable for a surprisingly reasonable sum. If you buy well then any difference in fuel costs can be put aside
Someone once said something to me regarding fuel costs for light aircraft which made a lot of sense. It went along the lines of sorting out all your fixed costs first. Best deal on insurance, within reason keep it where hangarage is reasonable etc etc. Then if you want a twin it shouldn't cost a lot extra per year. I know these should be obvious but I have seen a few people who haven't been on top of all their fixed costs and have been handing over a lot more than necessary.
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Old 1st Mar 2012, 17:19
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“Best deal on insurance, within reason keep it where hangarage is reasonable etc etc.”

That might work outside the EU, but most privately owned aircraft which do 100h a year, the fuel cost will be more than the rest of the costs put together (in the EU). Even my Rotax powered machine burning 18.5lph of mogas - fuel costs are 52% of the yearly costs (based on 100hours a year).

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Old 1st Mar 2012, 18:25
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Most Efficent Twin?

It might be this!









Charlie
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Old 1st Mar 2012, 20:10
  #27 (permalink)  
 
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Most fuel-efficient twin?

Probably, though my compatriots won't thank me for saying this, the 787.

I only mention this because the OP hasn't specified his mission in sufficient detail to answer more clearly.

What load?

How far?

Is speed important?

Field performance?

OEI ceiling?

Overwater speed?

...and so on.

(the 787 is quite nice to fly too, as it should be, though I'm sorry they've handled pitch-power couple the way they have and I'm not sure that Boeing have done all they should with some systems; the performance calculation looks like something from the 1980s).
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Old 1st Mar 2012, 20:19
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OK, more seriously:

Some Senecas are pretty good all-rounders; avoid those which have been thrashed by flying schools and the V with it's shocking DOW/MTOW. The handling is never better than OK, and at low speed is, in my view, only just reasonably certifiable (hence all the landing accidents).

The Baron is a delight. Do not buy one if you open and read your bank statements because you have to.

If you have a load to carry and want to feel proud, bite the bullet and buy a Navajo.

To join one of the happiest bands of owners I've met, go for the Twin Commanche, but accept that it is a machine which focuses on range, not payload. The owners club is a must.

A GA7 is very nice, albeit slow, but good ones are VERY hard to find.

Avoid all the modern stuff; it's down to a price and a weight, not up to a standard.
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Old 2nd Mar 2012, 03:43
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If one wants range and efficiency in an "old" design, then look no further than to the Piper Aerostar. Yes, it's known for being a fast rocket (the fastest, in fact), but that also means it's the most efficient. The 700 will do 260kts on 45-50gph. At 205kts, it'll sip 25-30gph. Go down to fast single engine speeds, around 140-150kts, and the Aerostar will probably not drink much more than 15-20 gph (a guess). That's rather impressive. With a standard 165gal, or optional 210gal tank, it's easy to see just how far one could go.

To get efficiency there is only one thing you can do - reduce drag. Aerostars have one of the narrowest cross sections and a very high wing loading, so that's why the have minimal drag.

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Old 2nd Mar 2012, 04:21
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Go down to fast single engine speeds, around 140-150kts
Although that's the Aerostar's stall speed innit'?
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Old 2nd Mar 2012, 07:14
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There are no fuel efficient twins.
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Old 2nd Mar 2012, 14:42
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Well, I've seen a Rutan Defiant for sale recently in the UK.
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Old 2nd Mar 2012, 14:48
  #33 (permalink)  
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I am surprised that the Cessna 337 has not been mentioned. Though not equal to a Twin Comanche is some regards, it will exceed in a few others...
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Old 2nd Mar 2012, 16:11
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[Twin Comanches] are great to fly and really give you a lot of speed and joy for 16 GPH @ 160 kts.
Lean more. 13 GPH (OK, that might give you 155 kt).

Though not equal to a Twin Comanche is some regards, [the C337] will exceed in a few others...
Like the din...

Another devoted Twin Com fan.
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Old 2nd Mar 2012, 17:46
  #35 (permalink)  
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Yes, I'm a Twin Comanche fan too, as long as you're not trying to taxi in between high snow banks, or help someone's grandmother get aboard!

MT props make it a real preformer too!



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Old 2nd Mar 2012, 19:23
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The Tecnam P2006 is a pure training aircraft, not suitable for anything else IMO. Range, speed, operating ceiling and surprisingly poor finish quality wouldn't justify the $450k as a personal aircraft.

A Rotax 914 (i.e. turbo) version of the P2006 wouldn't be that great either because first of all, the 914 got a shorter TBO than the 912S and most importantly, the 914 does not like AVGAS 100LL.

The TwinCo is a great aircraft but that is no secret so used market prices are quite high for such an old bird.
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Old 2nd Mar 2012, 22:28
  #37 (permalink)  
 
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Originally Posted by Pilot DAR
I am surprised that the Cessna 337 has not been mentioned. Though not equal to a Twin Comanche is some regards, it will exceed in a few others...
The problem with the C337 is the pilots peripheral vision. When you put the paper bag over your head so nobody can recognize you in such a god-awfully ugly airplane , everyone just cuts two eye holes in the front. The problem is you can't see out the side without turning your head, thereby creating a danger of hitting something
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Old 2nd Mar 2012, 23:57
  #38 (permalink)  
 
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I completely disagree about the Tecnam. If you want to go from A to B with twin safety at single engine prices, this is the only thing that can do it. Yeah, the DA42, but it's more than twice as expensive to buy and doesn't go any faster. Also, even in places where they don't have Jet A1, you can bet they'll have Mogas at a local gas station. Mogas is available everywhere.
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Old 3rd Mar 2012, 04:15
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Also, even in places where they don't have Jet A1, you can bet they'll have Mogas at a local gas station. Mogas is available everywhere.
If you're going to GA airfields only, you might get Mogas or they might let you be creative with jerry cans and a taxi but if you fly to a real airport, I don't know of any airport that offers Mogas or would let you bring in your own Mogas (a lot of jerry cans btw). Given that the P2006's endurance isn't great at all and personal aircraft are used for trips to remote places, I still don't think a Rotax 914 equipped P2006 would provide much value.

A twin engine ceiling of 15000ft and a single engine service ceiling of 7000ft isn't even enough to cross the Alps safely. In my view, the P2006's mission capability is that of a low end single.

I would always prefer a used D42 (if you like modern and fuel efficient planes) or one of the old AVGAS guzzlers when it comes to a personal twin.
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Old 3rd Mar 2012, 06:25
  #40 (permalink)  
 
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Mogas may be "available" everywhere but usually only in jerrycans, and the business of transporting jerrycans makes it impractical for serious use. For example my usable tank capacity is 86 USG (325 litres) which would be about 17 jerrycans, each of which is so heavy I can barely lift it and would need a sizeable vehicle to transport them. Also no normal garage would allow that many to be filled - AFAICS.

A twin engine ceiling of 15000ft and a single engine service ceiling of 7000ft isn't even enough to cross the Alps safely. In my view, the P2006's mission capability is that of a low end single.
Very much so; its ceiling is too low. If the ceiling is really 15k, and that (depending on the cert regime) is usually defined as +100fpm climb rate, then you are looking at ~FL130 as the highest practical altitude at say ISA+10 (typical southern European / Alpine summer conditions) and that is below the Eurocontrol MEAs in that region. For example this route has an MEA of FL140 and that is one of the lower ones. (Also that route is too long for it). It would be flyable VFR but only on very calm days when there is no chance of a downdraught.

But I think they know their market. It is FTO training and surveillance.

Re cost of capital, I really think this needs to be disregarded on a private purchase because if you took that into account you would die very rich not having done anything remotely interesting What cannot be disregarded is depreciation.
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