Archive > Technical discussions
Aircraft specs.
EHM-0654 Murray:
Not sure if this comes under technical discussions or Ask EuroHarmony, but I'll ask here as the forum subject mentions the fleet :D
Any chance of getting climb and descent rates (and fuel flow figures for those) for the entire fleet, so I can bang them into FSNavigator (unless someone already has done this)?
Will share the results once I finish.
EHM-1077 Emanuele:
It's something that I've always sought
but never really had the determination
to complete. I'll be glad if somebody
takes care of it.
Maybe we could come up with a batteries
of tests to run on the various aircraft and
slowly collect the info.
This brings up two questions:
1) What data do we need to collect?
2) In what conditions that data need
to be collected?
The second question is slightly easier
to answer: whatever the data is, it
should be collected all the other conditions
being the same.
I.e. if we are collecting the climbing rate
of a plane and its fuel consumption in
such phase, we should make sure that:
- the plane is flying straight and it's in a
stable climb, with absolutely -no wind-.
- we don't include the transitions in the
measurement (i.e. if we set the AP to
climb from 2000ft to 8000ft, we should
only take note of the fuel in the tank
at 4000ft and 6000ft.
- The -thrust- setting should be kept at
80%, while the speed is allowed to
settle accordingly (and according to the
climbing rate).
- Climb rate 1000 or 1500fpm (depending
if the plane can sustain it)
- The pressure should be set the same
during all tests: 29.92/1013
- The units should be all the same (lbs/hr).
- The airplane configuration file should be
EHM's original, otherwise we are gonna
get different results all the time.
- Before you make the test, refill (in-flight)
the tanks so that it's at 100%.
Back to the first question:
The data for FSNavigator is definitely a
good start. climb/descent rate, speed,
fuel consumption for each phase.
Is there any other program out there
that need similar but not exactly the
same kind of data?
How to actually get the the data: AFSD
is a nice free application to get all sorts
of in-flight instantaneous statistics.
You can find it on avsim.com. If you have
any other method, share it! =)
Preliminary Specifications for the descent
and cruise tests:
Descent:
-Same as above, with 20% thrust and
1000fpm descent rate.
-Everything else inverted: start descent
at 8000ft, check fuel at 6000ft, check
fuel again at 4000ft, let the descent
continue unaltered until 2000ft.
- Before you start the descent, tweak
the fuel tank so that it's only 20% full.
Cruise:
- again, thrust at 80%
- test to be executed in level flight
with no wind, stable speed, at the
following altitudes:
- FL100 for VFA planes
- FL240 for C1-C3 planes
- FL320 for C4-C6 planes
- FL360 for C7 planes
- refill to 50% before the test begin
- when you decide to begin the test,
take note of the time and fuel.
- The test ends 5 minutes later,
when the fuel is measured again
and the final calbulation is made
(fuelEnd - fuelStart x 6 = lbs/hr)
When we are done, let's post the
results here, where Murray will collect it.
If more than one pilot make a test for
the same plane, no worries! The results
should be the same, if not, we'll make
an average or we'll investigate why
there's a discrepancy...
Furthermore, if you notice that a plane
for whatever reason can't do the test
as I proposed, please report it here, maybe
with a proposal of what should be different
for that plane.
Ok, I guess that's enough for this post...
Ciao ciao!
Manu
EHM-1077 Emanuele:
Ok, I just did a test flight to find out if
what I proposed is actually feasible.
I took the VFA Cessna 172 and of course
I found out I had to change a few things
because of its limited power, but it all
took less than an hour, including t/o and
landing for the pleasure of doing them.
Here is what I found:
-----------------------------
VFA Cessna 172
Climb: 3000->5000 feet
Thrust: 80%
Rate: 480 fpm (AP: 700 fpm)
Speed: 63.7 KIAS
Fuel: 45.2 lbs/hr
Cruise: 6000 ft x 5min
Thrust: 80%
Speed: 90.2 KIAS
Fuel: 39.0 lbs/hr
Descent: 5000->3000 feet
Thrust: 20%
Rate: -650 fpm (AP: -700 fpm)
Speed: 83.1 KIAS
Fuel: 9.2 lbs/hr
-----------------------------
It would be nice if anybody who wish
to help can provides a similar report,
sticking to the test altitudes of the
earlier post, and using the default
climb/descent rate of plane.
Ciao ciao!
Test Pilot Manu
EHM-1077 Emanuele:
Just thought of something:
to avoid more than one person testing
the performance of the same plane
put a "placeholder" message like this one
with the plane you intend to test:
----------------------------------------
Main Division - Dornier 228-100
Coming soon...
----------------------------------------
Eventually I'll get back to this msg
and I'll edit it to include the stats.
(a few hours later)
And here we go!
----------------------------------------
Main Division - Dornier 228-100
Climb: 6000->22000 feet
Thrust: 80%
Rate: 1770 fpm
Speed: 156 KIAS
Fuel: 840 lbs/hr
Cruise: 25000ft x 5min
Thrust: 80%
Speed: 189 KIAS
Fuel: 720 lbs/hr
Descent: 20000->4000 feet
Thrust: 30%
Rate: -1200 fpm
Speed: 168 KIAS
Fuel: 207 lbs/hr
----------------------------------------
Notes: values for climbs/descent
are averages between start and
end, except the thrust which is
kept fixed.
----------------------------------------
Manu
EHM-0654 Murray:
--- Quote ---Originally posted by manu3d
...if we are collecting the climbing rate
of a plane and its fuel consumption in
such phase, we should make sure that:
- the plane is flying straight and it's in a
stable climb, with absolutely -no wind-.
- we don't include the transitions in the
measurement (i.e. if we set the AP to
climb from 2000ft to 8000ft, we should
only take note of the fuel in the tank
at 4000ft and 6000ft.
- The -thrust- setting should be kept at
80%, while the speed is allowed to
settle accordingly (and according to the
climbing rate).
- Climb rate 1000 or 1500fpm (depending
if the plane can sustain it)
- The pressure should be set the same
during all tests: 29.92/1013
- The units should be all the same (lbs/hr).
- The airplane configuration file should be
EHM's original, otherwise we are gonna
get different results all the time.
- Before you make the test, refill (in-flight)
the tanks so that it's at 100%.
--- End quote ---
Air temp? That could make a *huge* difference to the results. I take it you just hit the clear weather button in FS.
--- Quote ---Originally posted by manu3d
Just thought of something:
to avoid more than one person testing
the performance of the same plane
put a "placeholder" message like this one
with the plane you intend to test:
<snip>
Eventually I'll get back to this msg
and I'll edit it to include the stats.
Manu
--- End quote ---
Manu, thanks for all the advice. Duly noted and in that case:
----------------------------------------
Main Division - Antonov AN-140
Stats coming soon!
----------------------------------------
:D
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