Today's Message Index:
----------------------
1. 05:52 AM - Setting prop pitch (R Holder)
2. 02:07 PM - Electrical Ground (Troy Maynor)
3. 02:32 PM - Re: Electrical Ground (Robert C Harrison)
4. 02:46 PM - Re: Electrical Ground (Tim Ward)
5. 02:56 PM - Re: fuel pump etc (Rowland & Wilma Carson)
6. 02:56 PM - Re: fuel pump etc (Rowland & Wilma Carson)
Message 1
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| Subject: | Setting prop pitch |
> Set the prop to 5500 WOT flat and level, but that is
> not where you cruise. When the prop is set to 5500 you
> benefit from the prop pitch during other times such as
> in takeoff with better climb performance, lower
> throttle setting for cruise means a little better fuel
> economy. If it is set for 5500 and lets say you bounce
> up off the runway and you go "oh no I'm going to drop
> it in", then when you give it full throttle trying to
> save yourself the engine will spin up faster to save
> you, compared to, if you had too big a bite of air with
> the prop and it had to struggle to spin up. If the prop
> is pitched too much you will need to give it more
> throttle/fuel to achieve your cruise speed. When it is
> set for 5500 you will be able to pull back on the
> throttle/less fuel and still cruise at the speed you
> want. You will have a higher top end speed, too. Mind
> you we are comparing 5500 to your 4800 here. A 700 rpm
> gain will make a big difference. I know some that
> cruise at 5500 WOT just to cruise. This will cause
> extra wear over time. My question is why? Do you need
> to get somewhere a few miles per hour faster all the
> time? Why wear and tear any extra on the engine than
> need be. We want it to be reliable for its 1500 hours
> and more.
I think you need to stress (I think this is right) that
the 5500 WOT is static, on the ground. The rpm for WOT in
the cruise will depend on a number of factors.
But i would like to ask if anyone has a 912S/ULS with an
airmaster prop and a MAP guage _AND_ a fuel flow meter.
Could they do an experiment for me ! Chose a specific
airspeed (X) at around your normal cruise speed. I would
use 115 knots on my plane.
Now there are a number of combinations of rpm and MAP that
will achieve that airspeed. I use 25 inches and 4600.
The experiment is to set different rpms; and for each
adjust the MAP so that the airspeed is X (stabilised).
Then for each combination of rpm/MAP record the fuel flow
- ideally to the tenth of a litre but a tenth of a US
gallon would be OK.
As the engine must be producing the same horsepower as it
is travelling at the same speed for each combination, any
variation in the fuel flow is a measure of the efficiency
of the engine. If the efficiency is the same for the whole
rpm range tested then the fuel flow would be the same. So
a "scientific" test will show any variation and maybe
there will be an obvious peak to the efficiency - this
will be where the fuel flow is least.
According to Roger's recent postings the implication is
that this peak efficiency rpm/MAP combination will be at
or around 5000 rpm.
If several people are able to do this, please post results
direct to me so that I can collate independently :-) The
critical factor here is that the MAP must be adjusted to
get the same airspeed (X) for each rpm figure tested.
So the results might look like the following
at 115 knots
4500 26 15.8 (15.8 would be the litres per hour fuel
flow)
4600 25 15.5
4700 24.5 15.5
4800 24 15.3
4900 23.5 15.1
5000 23.1 15.0 <------ B E S T E F F I C I E
N C Y
5100 22.8 15.2 O N T H E S E T E S T F I
G U R E S
5200 22.4 15.4
5300 22.1 15.5
It would be something to pass the time on your next two
hour flight !
And if you had longer, other speeds could also be tried -
X+10 and X -10 !
I will ask the wear and tear questions in another mail
sometime as many people only answer one question per mail :-)
Thanks
Richard Holder with an efficiency hat on !
Message 2
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| Subject: | Electrical Ground |
Hi Folks,
At what point on the engine is the most common location for the battery to
engine ground? And do I need a seperate ground from the firewall ground to
the engine? My battery will be on top of the starboard footwell. I found a
bolt that holds one of the brackets for the ignition coils on top of the
block but the closest is one of the studs at the rocker cover/head. I didn't
want to disturb this one though.
Troy Maynor
N120EU Europa Monowheel Classic
Left to finish:
Seats, engine install underway, some wiring.
Weaverville, NC USA
Message 3
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| Subject: | Electrical Ground |
Hi! Troy,
Installations are different but my battery ground is to a crank case
stud, away from other electrical activity and certainly directly
attached not needing to have continuity through anything else. If I
recall it is via the negative side of the starter solenoid.
(Unfortunately I can't access my 'plane at present.) However IMHO your
choice of location is right ..least voltage drop possible through
shortest cables. I also used multicore welding cables with powerfully
crimped terminals.
Regards
Bob Harrison G-PTAG
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]
Sent: 02 November 2008 21:56
To: europa-list@matronics.com
Subject: Europa-List: Electrical Ground
Hi Folks,
At what point on the engine is the most common location
for the battery to engine ground? And do I need a seperate ground from
the firewall ground to the engine? My battery will be on top of the
starboard footwell. I found a bolt that holds one of the brackets for
the ignition coils on top of the block but the closest is one of the
studs at the rocker cover/head. I didn't want to disturb this one
though.
Troy Maynor
N120EU Europa Monowheel Classic
Left to finish:
Seats, engine install underway, some wiring.
Weaverville, NC USA
Message 4
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| Subject: | Re: Electrical Ground |
Troy,
If it is a Rotax engine, I used the bolt holes located either side of the
engine sump, that Rotax use to transport the engine. You should have the
bolt left over when unpacking it that went through a bracket for
transportation.
If not a Rotax there may be a similar setup with other engines.
Cheers,
Tim
Tim Ward
12 Waiwetu Street
Fendalton,
Christchurch
NEW ZEALAND
PH 0064 3 3515166
MOB 021 0640221
ward.t@xtra.co.nz
----- Original Message -----
From: "Troy Maynor" <wingnut54@charter.net>
Sent: Monday, November 03, 2008 10:55 AM
Subject: Europa-List: Electrical Ground
> Hi Folks,
> At what point on the engine is the most common location for the battery to
> engine ground? And do I need a seperate ground from the firewall ground to
> the engine? My battery will be on top of the starboard footwell. I found a
> bolt that holds one of the brackets for the ignition coils on top of the
> block but the closest is one of the studs at the rocker cover/head. I
> didn't
> want to disturb this one though.
>
>
> Troy Maynor
> N120EU Europa Monowheel Classic
> Left to finish:
> Seats, engine install underway, some wiring.
> Weaverville, NC USA
>
>
Message 5
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| Subject: | Re: fuel pump etc |
At 2008-10-26 20:29 -0400 DuaneFamly@aol.com wrote:
>This is what I did.....
Mike - thanks for the nice pictures. The layout looks neat ....
But shouldn't the gascolator be ahead of the fuel pump in the sequence?
And all the advice I've seen is that the pump wants to be mounted at
45 degrees, or at least have its inlet lower than its outlet.
regards
Rowland
--
| Wilma & Rowland Carson http://home.clara.net/rowil/
| <rowil@clara.net> ... that's Rowland with a 'w' ...
Message 6
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At 2008-10-27 09:24 +0000 Robert C Harrison wrote:
>I always have difficulty remembering if you are building trike or Mono
Bob - I'm a mono.
>However I personally would be bothered about stressing the pipework if
>you do it prior to stabilizing the module in the fuselage
I'm not intending to fix it down yet, just want to get it in roughly
the right place. I recognise that the aluminium needs to be fixed in
a non-stressed position and not subject to any movement or vibration.
>I've used braided rubber throughout
That is great for flexibility and s/s braiding is very robust but
heavier (and more expensive) than the aluminium, and can't do really
tight bends.
Thanks for your input.
regards
Rowland
--
| Wilma & Rowland Carson http://home.clara.net/rowil/
| <rowil@clara.net> ... that's Rowland with a 'w' ...
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