Hello Paul,

   I've been proselytizing an a&p friend extolling the virtues of my
   13b.  He is curious about application in a helicopter.  Several
   helicopters use a horizontal engine with belts and pulleys to power
   the roters.  The engine output rpm needs to be 3000 to 3200.
   Horsepower should be 200 or better.  Can a fuel injected 13b
   generate that much hp at 3000 rpm or am I even asking the right
   question. Is this really a torque question?

   Your thoughts?

   William Hagood
   LexAmi
   Supporting Excellent Teaching
   Sent via I-Phone

   The rotary is not a high torque engine. It must be geared down and
   it must be
   run at 7500 RPM to get 250 HP. However many people are hung up on the
   idea of high RPM. Just think of the rotary as you would a turbine or
   electric
   motor. RPM is not a bad thing in a rotary until you get over 10,000
   RPM and in
   that case it is just like a turbine or an electric motor of the same
   size and HP. An electric motor will also throw off its copper windings
   at high RPM.

   Paul Lamar



   I know of a couple of successful Hughes TH-55 / 269A helicopter
   conversions to the Mazda 13B. One was recently sold on ebay for $26,000
   and it obviously worked well according to the seller and the photos. I
   can still see the photos since I saved it on my ebay watch page, but it
   will disappear soon and I think ebay photos will not download. The
   conversion was very neat and clean looking. I wish the guy would
   publish
   plans and details. I also talked to guy that had one several years ago.
   Obviously the reduction from engine rpm to drive the helicopter had to
   be worked out, but since the Hughes uses a multi V-belt reduction this
   is not a major issue.

   John McEverett

   John, use the screen capture mode in Windows to capture
   e-bay photo's. Press the prt sc key on the upper right side
   of the key board. That puts the picture in the hidden clip board
   file. Than load MS Paint. Then select "paste and the clip board picture
   will appear in MS Paint. Then name and save the file as a jpg.

   I have not tested it with free paint programs other than
   MS Paint but I suspect it will also work. If somebody on here
   has I would appreciate the name of the free paint program
   that works.

   In Linux it is a lot easier as you click on a free screen capture
   program that saves the file directly as a .png which works
   like a jpg for the most part.

   In a Mac here is how you do it.
   Look at the attached jpg.


   Paul Lamar


   Paul, To save an E-bay picture or pretty much any. picture with windows
   just right click on it and select save picture as. It will go to
  windows
   explorer and then click save. You can change the storage location but
   default is "pictures"  You showed me how to do this two years ago.

   george grimes

   Unfortunately that does not always work.
   There apparently are some html tricks that people
   are using to defeat that process.

   The screen shot way so far always works as it is
   internal to the computer and not dependent on
   an html program.


   Paul Lamar



  Paul,

  I got the photo from the ebay listing this time no problem but have
  noticed in the past that they would not copy by any means. The reason
  for ebay doing this is like all web photos they are the property of the
  person that originates them. Ebay was having a problem with some scam
  artists copying a photo or listing, waiting a few weeks or months then
  setting up an account and listing the item falsely and selling it. That
  has essentially stopped. They also often had an ebay watermark on the
  photos. Apparently the security procedures didn't always work out,
  perhaps with iphones or such. Anyway it looks like they can now be
  copied, or at least some of them can.

  Sidenote: I now suspect that the Mazda powered helicopter did not sell
  on ebay. I am trying to contact the person that listed it. He was very
  much promoting the use of the Mazda engine. Maybe he's one of your
  subscribers. If so I would very much like to hear from him.

  Another photo is attached.

  John McEverett

  That is a small picture. We did at one time have somebody
  on here with a rotary powered helicopter. I am not sure
  he is still on the list.

  Here are some pictures I took of that helicopter (I think)
  in Jan 2 of 2006. I forgot where. I have some more that
  somebody sent I think. Obviously it was not OSH or Sun n Fun.

  Linux will do screen shots on ebay.

  Here is an example.

  This is a bit difficult as it is a pop up.
  What you have to do to handle this is set a ten
  second delay in the screen shot and then go back
  and pop up the enlargement.

  Paul Lamar


 Paul,
 It is the same helicopter, maybe a different owner however. I'd like to
 track it down. The seller referred to "his" web page on rotary engines.
 It was signed David Leonard if that helps. The helicopter was listed as
 being located at Lake Orion, MI.
 Another mystery to solve.
 John McEverett

 Dave has a rotary roster web site but I did not see it on there.
 http://rotaryroster.net/

 Paul Lamar


Thanks all. I would love to hear more David Leonard's helicopter, too.

William Hagood
LexAmi
Supporting Excellent Teaching

I guess I need to go back to school and learn to write :)

Dave Leonard has the web site but not the helicopter.

More pictures.

Paul Lamar