Engine Sizing and Selection

In article , Barnyard BOb -- says...

Although my new moon really wasn't yesterday....
It's was close enough for the intended purpose.
Your response could begin to explain much, too. g

Barnyard BOb -- over 50 years of successful flight

Hey Unka Bob
We didn't have a new Moon this year in our parts I think it's the Solar storms
in my neighborhood. Gravity is less too since my plane flys better since it got
cold...

Chuck (I looked in the mirror and saw my moon was sagging)S

Barnyard BOb -- wrote:

Although my new moon really wasn't yesterday....
It's was close enough for the intended purpose.
Your response could begin to explain much, too. g

I have been told that I defy explanation. As for the moon, however,
on my planet, Earth, the moon was closer to full than new yesterday.
A full moon and a total lunar eclipse will occur this coming weekend.
I expect that some barnyard animals might become especially agitated
during this period.

http://aa.usno.navy.mil/data/docs/LunarEclipse.html

David O -- http://www.AirplaneZone.com

Barnyard BOb -- wrote:

Although my new moon really wasn't yesterday....
It's was close enough for the intended purpose.
Your response could begin to explain much, too. g

I have been told that I defy explanation. As for the moon, however,
on my planet, Earth, the moon was closer to full than new yesterday.
A full moon and a total lunar eclipse will occur this coming weekend.
I expect that some barnyard animals might become especially agitated
during this period.

http://aa.usno.navy.mil/data/docs/LunarEclipse.html

David O -- http://www.AirplaneZone.com
+++++++++++++++++++++++++++++++++

Didn't know about the upcoming eclipse.

As usual, you are unpredictable
while always informative. {8-D

Agitatingly yours,
Barnyard BOb ---

"Toks Desalu" wrote in message
news:mnGob.73419$HS4.639796@attbi_s01...
Nah-
I am in good ol' America!

Toks


If you don't mind using engines from good ol' down under, then Jabiru is an
excellent choise. 120HP at 83Kg (~170lbs), well constructed and well
supported by two very active dealers in the US. Check out the Jabiru engines
forum on http://groups.yahoo.com to learn more about real-life experiences
with these.

Rob

Dillon Pyron wrote in message
A twin powered by two unreliable engines is just an underpowered
single waiting to happen.

And when that happens, you land and get it fixed. But in the mean
time you have an aircraft well powered by a pair of engines with power
to weight ratios difficult to match at a cost within the reach of the
working man, with a composite reliability that exceeds a single 4
stroke.

It's true that the lone 2 stroke engine is typically paired with
aircraft that land off field as matter of course (golf) or can put
down pretty much anywhere when there is a failure (powered parachute).
But there are applications where weight is of paramount importance
(Hey, isn't that every airplane?) like ultralights. So thats the idea
of the dual system. and of course less engine weight means, less
airframe structure required to support it, less power required to
lift, and less wing to support all that, and less fuel to push all
that, etc...

BTW, Isn't that RV-4 with the 13B in it sweet looking?
http://powersportaviation.com/images.../Airplane2.jpg
Getting rid of those cheeks really cleans things up. The RV-6 doesn't
seem like such a great fit since Vans already made the frontal area
large in anticipation of the opposed cylinder engine.

(Jay) wrote:

Dillon Pyron wrote in message
A twin powered by two unreliable engines is just an underpowered
single waiting to happen.

And when that happens, you land and get it fixed.
++++++++++++++++++++++++++++++++++++++++

How utterly frigging cavalier and delirious can one get?
Tell of your real life experiences at this sort of thing.


Barnyard BOb -- over 50 years of successful flight

Dillon

The J-79 in the F-104 was great when it ran and a piece of crap when
it didn't which it didn't on numerous occasions.

They put a pair of them in the F-4 and every one knows how that bird
performed.

Big John

On Sat, 01 Nov 2003 05:02:24 GMT, Dillon Pyron
wrote:

----dlip----


There are very high output 2 stroke motors available around 1hp/lb.
Mainly adapted from snow mobile (Rotax) applications. Used as a
single, the realibility is below what most people desire, but as a
pair, its down right usuable.
++++++++++++++++++++++++++++++++++++++++++

BOb

----clip----

A twin powered by two unreliable engines is just an underpowered
single waiting to happen.

Big John wrote in message . ..
Dillon

The J-79 in the F-104 was great when it ran and a piece of crap when
it didn't which it didn't on numerous occasions.

Sounds like a 2 stroke, high power/weight... when it works.

They put a pair of them in the F-4 and every one knows how that bird
performed.

Big John

So would this be an example of the when the whole is greater than the
sum of its parts? You might say even the whole is the product (of the
reliabilities) of the parts.