Hi Duncan
Sorry I got it wrong. I don't believe anyone is now considering the BMW so
it doesn't matter too much. I am sure if anyone could have made the BMW work
satisfactorily it would have been you.
Regards
Nigel
>-- Original Message --
>From: "Duncan McFadyean" <ami@mcfadyean.freeserve.co.uk>
>To: <europa-list@matronics.com>
>Subject: Re: Europa-List: ENGINES!
>Date: Sun, 18 Sep 2005 18:00:51 +0100
>Reply-To: europa-list@matronics.com
>
>
>.<<...> BMW.....torsional vibration proved to be a too difficult
>> problem to overcome after exhaustive development work....>>
>
>Nigel,
>Please note that when running the BMW did NOT suffer from torsional
>vibration problems. Rather, it had the same starting difficulty that the
>
>912S sometimes has (only more extreme) which, by consensus of this forum,
>is
>not torsional vibration (although I don't agree with that).
>
>Rgds.,
>Duncan McF.
>
>----- Original Message -----
>From: "nigel charles" <nigelcharles@tiscali.co.uk>
>To: <europa-list@matronics.com>
>Subject: RE: Europa-List: ENGINES!
>
>
>> <nigelcharles@tiscali.co.uk>
>>
>>>Thats easy!
>>>> Get the 140 hp Dual Port Fuel Injected EA81 with redundant injection
>>>>here:<
>>
>> Very easy if you want to substitute baggage capability for engine
>> weight. The extra weight also means the battery has to be in the tail
to
>> keep the C of G within limits. This increases the pitch inertia which
>> degrades the handling characteristics slightly.
>>
>> For those who are new to the forum and are trying to make an engine
>> choice the following might be a useful summary:
>>
>> Subaru - too heavy, NSI (the company producing the engine/gearbox
>> package) have a poor customer relations record.
>>
>> BMW - nice engine but torsional vibration proved to be a too difficult
>> problem to overcome after exhaustive development work.
>>
>> Mid West Rotary - very smooth and light but excessive fuel consumption
>> and very difficult to set up to run smoothly at all rpm's.
>>
>> Wilksch Diesel - lovely engine with many original design patents. It is
>> very fuel efficient and cheap to run due to much cheaper jet fuel. This
>> is an engine to watch in the future for the replacement of
>> Lyco/Continentals but it is just too heavy for the Europa. The radiator
>> adds significantly to the frontal area which may increase drag.
>>
>> Lyco/Continental - too heavy and high fuel consumption.
>>
>> Jabiru - the only workable alternative to the Rotax for the Europa. True
>> it is simpler. If you want a simple aircraft you would probably not have
>> chosen the Europa in the first place. Although it has a higher power
>> output it is at 3300rpm which is too high for the prop to use
>> efficiently so the performance advantage is negated. Being aircooled the
>> fuel efficiency is slightly down on the Rotax. Some cooling issues were
>> apparent from the cowling mods seen on early aircraft. It definitely has
>> a price advantage which is the one area which lets the Rotax down. If
I
>> was cost limited I would sooner spend it on the engine rather than
>> expensive avionics.
>>
>> Rotax - still the most suitable engine for the aircraft if rather
>> expensive. As Ivan Shaw said in the early days of the Europa 'there is
>> more work in developing the engine for the airframe than designing the
>> airframe in the first place'. The P51 argument would be relevant if
>> there was an engine that was significantly more suited to the airframe
>> but so far this is not the case.
>>
>> Choice of versions of the Rotax
>>
>> 912 - very fuel efficient but a little underpowered for the Europa
>> especially at max weight with high density altitudes. Using a VP prop
>> helps to extract maximum power at take-off without affecting cruise
>> performance.
>>
>> 912S - the extra 20hp make all the difference. Probably the first choice
>> for most Rotax users. Make sure the higher power starter is installed
to
>> help prevent kickbacks on start due to the higher compression ratio.
>>
>> 914 Turbo - yet more performance but at a price and increased
>> complexity. Probably the best engine for those who regularly operate at
>> high density altitudes. However the 912S with a VP prop will give
>> adequate performance up to density altitudes of at least 10,000ft and
>> will comfortably exceed Vno at low altitudes.
>>
>>
>>
>
>
Book yourself something to look forward to in 2005.
Cheap flights - http://www.tiscali.co.uk/travel/flights/
Bargain holidays - http://www.tiscali.co.uk/travel/holidays/
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