I'm calling it The Little Mermaid

"John Ammeter" wrote in message
...

Hmmm 594 pounds useful load?? Ok, that's Oyster and me if
we don't bring any baggage. You can take the train and meet
us there...

I'm thinkin' we need three of them and we could start an aerobatic team. Das
Wunderkind??

Rich S.

2
"John Ammeter" wrote in


Hmmm 594 pounds useful load?? Ok, that's Oyster and me if
we don't bring any baggage. You can take the train and meet
us there...

John

No, just stop every 30 minutes or so, for fuel. g
--
Jim (ducking) in NC

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

Two Thielert Centurion 4.0 V8-Diesels - turbocharged and liquid cooled.
The engines are positioned side-by-side inside the aft fuselage. Each
engine drives a five bladed prop mounted on a pylon.


....

Wonder if for all the trade-offs and compromises, you gain anything with
one engine and two pylon props?


Maybe this quote on another page from that site tells it all:

quote:
The first flight has been done successfully but the anticipitations (sic)
in the performance dates [sic... probably meant "anticipated performance
data"] of the TT62 could not be shown satisfactorily. The engineers were not
satisfied totally. Now the evaluation has started and that will be a lot of
work.
:unquote

On Mon, 14 Mar 2005 12:38:56 -0600, "Montblack"
wrote in
::

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

It's an interesting design. Is it a home built?

("Larry Dighera" wrote)
It's an interesting design. Is it a home built?


I didn't get the feeling from their web page it was being offered for the
homebuilt market.

http://www.hp-aircraft.de/edoc/news.html
Looks like a start-up company - news.

Now, The Little Mermaid, that would be a homebuilt :-)


Montblack

"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)

I read about some guy that was running a motorcycle engine, and even
shifting in flight for cruise.

My ideal sport plane would be an amphibian, if they get the rotating landing
gear back in.
--
Jim in NC

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.

Engines run better when fast, props work better when slow. If you're
using a belt drive anyway, there's no point in running the props fast.
Let the belt apply the high engine speed to a large, slow prop.

Jose
(I left r.a.homebuilt in, though I don't follow that group)
--
Math is a game. The object of the game is to figure out the rules.
for Email, make the obvious change in the address.

"Jose" wrote

Engines run better when fast, props work better when slow. If you're
using a belt drive anyway, there's no point in running the props fast.
Let the belt apply the high engine speed to a large, slow prop.

Jose
(I left r.a.homebuilt in, though I don't follow that group)

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

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

Why?

Small props do not mind turning fast.

No, they don't mind at all. But as I understand it they aren't as
efficient as large props turning slowly.

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.

Or you use a gear at the engine. Point is, once you're not direct
drive, the engine speed is no longer required to be the same as the prop
speed.

Jose
(r.a.homebuilt left in, though I don't follow that group)
--
Math is a game. The object of the game is to figure out the rules.
for Email, make the obvious change in the address.

"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