|
Hi Dave, glad you made it. Yes, really made it a
gloomy week on my end thinking about all the fun all you folks were having while
I kept pulling the curtains back looking at the ceiling {:>)
Thanks for the data, I'll look into the fuel
calibration procedure again. I would normally expect it to settle down by
now. Tell me once again the flow rate of your primary and secondary
injectors, then I'll go back and look to see if I perhaps screwed up the
calculation. I would normally expect to see the error being less than 0.5
gallons out of a 37 gallon tank of fuel. Naturally, the process depends on
accuracy in measuring input, but most tank pumps are pretty good. More
importantly, I would expect it to stabilize, so need to look into
it.
It looks like an average of about 2.35 gallons per fill-up
ranging from an error of 3.8 gallons to 0.8 gallons and I know we can do better
than that.
Ed
----- Original Message -----
Sent: Tuesday, October 30, 2007 9:04
PM
Subject: [FlyRotary] Re: Rotary Cross
Country Report
Ed,
Really Sorry you couldn't make it as well.
Sure would have been nice to finally meet you. I don't think I have to
tell you how much fun you missed.
The fuel monitor worked really well
and I was happy to show it off to anyone interested, including Tracy.
I'm still having the occasional problem with freeze-up, with 9 of them
recorded on my trip. Calibration also seems to be going slower than
expected. I must have done 5 or 6 of them before I left for the trip,
but it still never seems to change. Here are the actual and predicted
fuel usages for my trip. I did a calibration with each fill-up:
Actual Predicted
23.2
24.2
25.2
29.0
22.7
23.6
26.2
31.3
24.2
26.7
25.3
26.5
26.0
29.5
25.7 26.5
At least it always
errors on the conservative side and is usually not off by much. Maybe I
am not doing the calibrations correctly, but I am pretty sure I am following
your instructions. Any suggestions?
All in all, I cant believe I
ever flew without it. Sure makes fuel calculations much
easier.
Recommendations now that I have some more x-country experience
with it: put the mixture bar on all 4 of the main operation screens. I
mostly prefer to fly with the fuel flow/fuel remaining screen, but would like
to see the mixture bar there as well (though it does not matter much, because
I am usually off the scale to the lean side anyway).
Hope to see you
at next year's round-up!
Dave
On Oct 30, 2007 9:17 AM, Ed Anderson < eanderson@carolina.rr.com>
wrote:
Yee Hah! is right, Dave. Some very nice
numbers. Nice to still have that power available at the higher
altitudes with that turbocharger. My 15.5 MSL days are behind me, once
I get to about 12000, the old body wants its own turbocharger
{:>).
By the way, sorry I did not make it down to meet
you.Wanted to hear your session on turbocharging. I also had
another backboard which increases the EFISM display intensity which I was
going to bring with me. Since it plugs into the back of the front
panel, you would probably have no problem just unplugging the current back
board and plugging in the brighter one OR you can ship it back and I can do
it.
Next time
Ed
-----
Original Message -----
Sent:
Tuesday, October 30, 2007 11:04 AM
Subject:
[FlyRotary] Rotary Cross Country Report
I just finished a most excellent cross country in my Rotary
RV-6 and wanted to share the stats and the adventure. I visited
family in Boulder, CO, friends in Pensacola, and spent a week in Orlando
including watching the shuttle launch and going to the rotary round up in
Bell, Fl. I also delivered a prop to its buyer in Austin TX and
traversed the country westbound in a single day.
Best leg (Strong
tailwinds fading in the end): K88-82J, 601 NM and 2.9 hrs on
the hobbs. 23.6 gallons of MOGAS burned that I bought at K88 for
$2.74/gal. That works out to 207 Knots Ground speed at 8.1
gal/hr. Yee ha!
Of course, the winds play the deciding
factor. I had a mix of winds over the course of the trip here are
the overall stats:
4224 kn miles traveled
240 gallons
burned
$3.35 average fuel price (I had to buy 100LL on 2 occasions
which brought up the average a little)
$24 worth of 2-stroke oil
burned. ($830 total paid for fuel and oil)
26.0 hrs on the
hobbs
That works out to:
Average speed= 162 KTS
Average Fuel
Burn= 9.2 gal/hr
Average cost/mile= $0.19
Those are GPS point to
point numbers and include climb, taxi and heading variations.
The other way to look at fuel burn/Cruise speed is to use a calibrated ASI
and Fuel Flow insturment. I spent a couple hundred miles testing
various settings after getting the fuel flow computer fully
calibrated. Here are my data points taken in cruise, all were done
> 100 LOP (more power available with richer mixtures or closure of the
wastegate - not attempted this trip). Slight climbs or descents and
changes in mixture probably account for the variations. (RV is hard
to truly keep level especially when looking at other numbers and trying to
write) (Redline is 7000 RPM)
150 KTAS @ 13.5k and 8.0
gal/hr
154 KTAS @ 15.5k and 8.3 gal/hr (5100 RPM)
160 KTAS @ 11.5k
and 9.1 gal/hr
161 KTAS @ 15.5k and 8.7 gal/hr
162 KTAS @ 13.5k and
9.2 gal/hr
165 KTAS @ 13.5k and 10 gal/hr (5600 RPM)
172 KTAS @
15.5k and 10.7 gal/hr (5600 RPM)
179 KTAS @ 15.5k and 12.0 gal/hr (5900
RPM)
181 KTAS @ 15.5k and 11.8 gal/hr
183 KTAS @ 13.5k and 12.3
gal/hr
185 KTAS @ 17.5k and 13.5 gal/hr (6000 RPM) - WOT
189
KTAS @ 17.5k and 13.4 gal/hr (6000 RPM) - WOT
193 KTAS @ 13.5k
and 13.6 gal/hr (6100 RPM) - WOT
Clearly not the same fuel
economy as most lycoming installations, but not out of the ballpark
either. After considering the lower price of MOGAS the hourly cost
of flying is
No issues encountered with the engine. Tracy
noted that my gear leash seemed to be slightly larger than normal, and it
increased during the trip home. So next weekend the drive is coming
off for inspection and likely replacement of the snubbers.
--
David Leonard
Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
--
David Leonard
Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
|