I'm calling it The Little Mermaid

("Morgans" wrote)
My ideal sport plane would be an amphibian, if they get the rotating
landing gear back in.


http://www.beriev-usa.com/main/index.html
(You're half way there with this Russian number)

http://web.media.mit.edu/~tim/pix/oshkosh03_1/0788.jpg
(At Oshkosh)

http://web.media.mit.edu/~tim/pix/oshkosh03_1/0791.jpg
(At Oshkosh)


Montblack

"Jose" wrote in message news:b8uZd.5306

You are missing the point. Take a small engine, divide the output in
half,
and the prop is going to be small.

Why?

Because I can. Because that would divide the HP into two, so a smaller size
bike belt would be reliable. Pay attention.
--
Jim in NC

Morgans wrote:

"Montblack" wrote

Wonder if for all the trade-offs and compromises, you gain anything with

one

engine and two pylon props?


Montblack


I think so. Not too far off from my musings. Take a liquid cooled
motorcycle engine, run dual drive belts, one out each of the pylon mounts,
and with the smaller diameter props, you could run them faster to take
advantage of the high revving engine. You get to use Harley sized drive
belts and sprockets, readily available in junkyards everywhere. (the
sprockets, I mean)


In the article the airplane's pylons looked too thin to use belt drive.
Shaft drive maybe?

Dan, U.S. Air Force, retired

"Dan, U.S. Air Force, retired" wrote in message

In the article the airplane's pylons looked too thin to use belt drive.
Shaft drive maybe?

Dan, U.S. Air Force, retired

Most likely.
--
Jim in NC

I'm calling it "dead in the water" :-)

MJC

"Montblack" wrote in message
...
High Performance Aircraft out of Germany - HPA TT62
http://www.hp-aircraft.de/edoc/tech.html


I'm calling it The Little Mermaid.

Montblack

("Morgans" wrote)
In the article the airplane's pylons looked too thin to use belt drive.
Shaft drive maybe?

Most likely.


What about two horizontal pylons, we could call them wings?

One centerline (diesel) engine turning two props.


Montblack

"Montblack" wrote

What about two horizontal pylons, we could call them wings?

One centerline (diesel) engine turning two props.


Montblack

Naa. Then you get disturbed airflow to the props, need higher landing gear,
and the wings would not keep the spray off the props, if it were to be an
amphibian. With pylons, it is easy to adjust the angle to keep the
driveline nice in line and straight.
--
Jim in NC

:Yes, that is all true. The real problem is the rapid decline in the
efficiency of conversion from power to thrust as the propellor rpm
increases. The pounds of thrust per horsepower declines like a capacitor
discharge curve as the rpm increases and you have lost two thirds by the
time the prop rpm gets to 2000!

A ducted fan helps a little, but they are much less efficient than a big old
lazy unshrouded propellor chugging away.

Highflyer
Highflight Aviation Services
Pinckneyville Airport ( KPJY )

PS: Pinckneyville rec.aviation flyin is coming up May 20, 21, and 22. See
the article in AOPA Online.
"Morgans" You are missing the point. Take a
small engine, divide the output in half,
and the prop is going to be small. Small props do not mind turning fast.
Also, if you use the belts for the RPM reduction, you have to put the big
pulley out on the pylon, where you want a small one.
--
Jim in NC

Montblack wrote:
("Morgans" wrote)

In the article the airplane's pylons looked too thin to use belt drive.
Shaft drive maybe?


Most likely.



What about two horizontal pylons, we could call them wings?

One centerline (diesel) engine turning two props.


Montblack

That was exactly my thought when I looked at it. "They put a T-tail
behine a V-Tail. Why?"