Paul,

     Here's some video data for you.

http://www.youtube.com/watch?v=dZrADAieO6w

     It was taken this morning with a Flip video camera during my
  takeoff run   and   climb to about 4k msl.  OAT was 78.  Initially,
   the mixture was set the   same   as my last report as indicated by
  the EM-2's mixture bar.  Then I adjusted   the mixture a bit
richer,  toward "best power".  Best I can tell, the fuel   flow went
to 28.6  gph.  Sorry for the shaking as I was both the pilot and
the  cameraman.  I stopped recording when the sun blanked out the EM-
2's   screen.  I need to design a camera mount before I try this again.

     Prop was set to 2100 rpm for initial takeoff, then to 1900, and
  finally to   1700.  Max engine RPM (that I can read) was 6926, but
  dropped back to   approx. 6350 as speed increased, prop still at
  2100.  You can hear engine   rpm drop when I changed prop setting.

     It should be noted that the primary oil and water temps are on
  the EFIS,   not   the EM-2.

     Mark S.

     Good work Mark. Thanks for the data. I discovered Mike did not
  install the   4 push button sw's on my EM-2 so I'll have to do that
  to read that kind of   data.

     At a BSFC of .6 that is 286 HP. Not bad for only 6336 engine
RPM.  I get   2223   prop RPM with a 2.85 gear. Why do you set the prop
  RPM so low? What is the   tip speed at 2223 RPM on a 76 inch prop?

     What is wrong with the EM-2 display? It looks like mixture bars
  are over   writing  the text.

     Sounds like you need a set of David Clarks for your video
camera :)

     Paul Lamar

     Glad you found that exercise of interest.  I need to either, 1)
  build a   camera mount, 2) put some tape over the mic, and/or 3)
  have someone else   do   the filming while I fly the airplane.

     Regarding prop rpm, sometimes I use 2150, but normally I set it
  at 2100   prop   rpm because it works without over-revving the
  engine.  Tracy has the EC-2   rev-limiter set at 7500 rpm.  The M/T
  electric prop adjusts very slowly.   When I first start feeding in
  the power the rpm goes to 6900-7000rpm as   seen in the video.  It
  doesn't come down until I'm a good ways down the   runway.  I may
  try 2200 and feed the power slower and see how that works.   Or,
  start out with it set to 2100 and then re-set it once I'm rolling.
   At   2100 it climbs at 1300-1500 fpm, so that works just fine for
  Texas.  I   don't   want to cause my pax any nosebleeds.  BTW, I
was  carrying 80 gallons of   100LL in the video.

     According to my calculations, the prop tip speed at 2223 would
be  about   737   fps.

     Mark

     It was very informative. I screen captured half a dozen at different
     RPM's.

     Speed of sound at sea level = 1116 feet per second
     so that is only .66 Mach. Try setting the prop at 2400 RPM.
     You cannot over rev a rotary with a prop connected.
     It sounds like there is too much pitch at the start of the
     take off roll.

     The Rolex 3 rotor RX8 car's used to run 10,000 RPM for up to 24
hours     before the race organizers put a 8500 Limit on them to
make     everybody else competitive.

     I think if you do that you will shorten the take off roll.

     80 gallons is 480 pounds of fuel. ES empty weight is supposed to
     be 1900 pounds and gross weight 3200 pounds.

     That is a much better ratio than a C182. Max fuel on my C182 is
88     gallons.     If I lean it very carefully I can get the fuel
burn down to about  13   gallons an hour but I am only doing about
140 Kts. A used C182  is about   100K   and a new one half a million
:)

     Paul Lamar

     Paul,

     Those speeds are pretty much meaningless.  Vy for the Lancair ES
  is 105   kts,   so that was my target.  Vx is 85 kts and it climbs
  much better at Vx.   I'll   do another video once I figure out a
  camera mount.

     Regarding RPM limits, Tracy programmed the EC-2 for a max of
7500  rpm.   So,   that's my effective max rpm.  Almost criminal for
a p-  port engine to limit   it to 7500 rpm.

     Mark

     As Rick Perry says "almost treasonous" :)

     Paul Lamar

     Mark was kind enough to take me up in his Lancair ES a few
weeks ago     and I was thrilled and amazed...Mark is a great pilot,
and his  airplane is   the Ferrari of the air.  228 MPH casually
while the  engine wasn't even   doing 6K.  Light responsive controls,
 perfectly  stable.

     Gene Kahn

    Gene - Thanks for the kind words.  It was a nice day to fly.  We
  flew up  over the Highland Lakes.  You got some stick time.  I
agree,   it was a great  flight!!!  Glad you enjoyed it.

    Paul - Actually, what I think he is saying is that I didn't hurt
  anyone,  I didn't break the airplane, and I didn't upset the FAA.
;-)

    Mark

    When you get the camera mounted Mark please select some of the
  other  screens  from time to time so we can see all the data. I am
  really interested in  cruise screens at altitude. If your video
  camera has a mike input you  could say what altitude you are at
from  time to time and other things  like gross weight. The documentation
  of the EM-2 could be better  with more pictures of the various
  screens possible.

    Paul Lamar

  Paul,

  Honestly, I rarely use the other screens, but I'll do it if it
makes  you happy.  Data is split between the EM-2 and the EFIS.  I
may be  able to patch into the ANR for narration.  First, I'll need
to  fabricate a mount for the camera.

  Mark

  I appreciate it Mark.

  Paul Lamar input input :)

  Lost in Space.... it does not compute.

Dale Davies

http://www.rotaryaviation.com/eficont.html

Paul Lamar


ROFL

Dale Davies