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