Hi,

   Does anybody know how many aircrafts are flying with a 13B rotary
   engine?

   I know the list of rotary builders but I only count 11.

   Thanks!

   Kevin van der Beek

   I don't really know. I keep hearing about another one about
   once a month I did not know about. My guess is about 100 Mazda based
  world
   wide.  Some start flying and some stop flying.

   That does not count of course the  over 700  Alexander-Schleicher
   50 HP one rotor motor glider engines sold by Austro Engines.

  //www.austroengine.at/cms/front_content.php?idart=37

   Nor does it count UAV rotary engines manufactured by several
companies.

   We have about 1000 people on this list although I have not counted
   recently.

   Many flying are not on this list.

   Paul Lamar



  I have listed well over 50 flying aircraft on the Rotary Roster web
site,
  and I have not updated it in over a year.  There have been a few
  additions
  since then.
  Click on the link for flying aircraft..
  http://RotaryRoster.net <http://rotaryroster.net/ <
  http://rotaryroster.net/

  --
  David Leonard

  Turbo Rotary RV-6 N4VY
  http://N4VY.RotaryRoster.net <http://n4vy.rotaryroster.net/ <
  http://n4vy.rotaryroster.net/
  http://RotaryRoster.net <http://rotaryroster.net/ <
  http://rotaryroster.net/


  Kevin,     I think Tracy Crook has sold over 350 of his PSRU drives.
  Being that build times are so long this measures projects ready for an
  engine more than the number flying. It does also demonstrate the
number of
  builders confident enough to put the money into a rotary.

  george

  There is a Mustang II with rotary engine in McKinney, TX. owned by Bob
  Rogers. The following EAA web site tells the story:

  http://www.eaa1246.org/projectsnplanesdisplay.asp?id=10&pic=192

  Have not seen this one on any of the lists nor do I know if it is
still
  flying. Worth looking into though. The Mustang II with tapered and
folding
  wing will out-perform an RV-7. See: Mustangaero.com

  Ed Fredrickson


Ed,

I've recently started compiling a list of flying rotary a/c.  The
Mustang II
that you mentioned is on my list.  I've posted the list to FlyRotary
recently, so you may be able to search the archives and find it.
Unfortunately, I don't have access to it here at the office, so
can't provide an actual count until I get home from work tonight.  My
guess
is about 50 +/-, but that only includes those that we know about.

Mark S.

Mark



Paul, David, Mark, Ramon, George, Ed thank you all for the information I
will have a look on all the websites.

Does also someone know how many hours of ground testing is being done
before take-off and at what rpm's?

For example, for the of total 50hours:

Sequence Duration (Minutes)Operating Conditions
1     5min     Starting - Idle
2     5min     Take-off power
3     5min     Cooling run (Idle)
4     5min     Take-off power
5     5min     Cooling run (Idle)
6     5min     Take-off power
7     5min     Cooling run (Idle)
8     15min    75% of maximum continuous power
9     5min     Cooling run (Idle)
10     60min    Maximum continuous power
11     5min     Cooling run and stop
Total: 120min

Kevin


It is left up to the individual builder.
To my knowledge nobody has done such a test on a rotary. IMHO sounds too draconian.
The FAA 150 hour engine certification requirements are much less stringent.
Max power runs are limited to 5 minutes. The Le Mans duty cycle for
the Mazda 4 rotor was much more severe. See the attached chart.

In any liquid cooled engine one degree increase in ambient temperature
decreases cooling effectiveness roughly one percent.

In the Mike Wills rotary powered RV4 one can taxi for a mile without the engine
coolant rising above 180 F at an ambient temperature of 80F.

Paul Lamar