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

Hoax?
Okay, I'm about to think this ebay listing was a hoax or even worse a
scam. 1.The seller used the same photos that you have Paul. 2. He
referred to "his" web site which leads one to Dave Leonard's site. That
led me to think that the owner was David (Dave) Leonard which is not
the case. 3. The winning bidder never left any feedback for the seller
and the buyer had no record of previous ebay purchases... suspicious. 4.
I have attempted to contact the ebay seller about whether or it sold or
not and have no reply.

I know it does exists (or did) and someone owns it, but probably not the
guy that listed it for sale on ebay... in my opinion. Again, it is
opinion only and based on the above. What a shame. A lot could be
learned from this one.

John McEverett

I definitely went to some one's hangar as the pictures I have were taken
with my camera. It is a rather rare camera. I'll have to go back to some old back up DVD's and find the guys name.

Paul Lamar