Nasa Icing courses

wrote in message
news
On Sun, 08 Jan 2006 05:02:33 GMT, George Patterson
wrote:

In the absence of some catastrophe, such as a bent pushrod, this is
generally
caused by not flying enough. The layer of hardened steel on a camshaft is
fairly
thin. Let the plane sit long enough, and rust will form. When the engine
starts
again, the rust is worn away, making the thin layer of hardened steel
thinner.
The worst wear points, of course, are the tips of the lobes. Once the
hardened
steel wears through, the softer steel underneath goes pretty rapidly.

The automotive world tried out roller lifters a long time ago. They
would work fine in aircraft engines too. I've heard that some of the
engines built for the homebuilt market can and do incorporate roller
lifters. I even thought I read that at least one company was
intending to certify such an engine.

Corky Scott

It is not uncommon to see roller rockers on round engines.

wrote:
On Sun, 08 Jan 2006 05:02:33 GMT, George Patterson
wrote:


In the absence of some catastrophe, such as a bent pushrod, this is generally
caused by not flying enough. The layer of hardened steel on a camshaft is fairly
thin. Let the plane sit long enough, and rust will form. When the engine starts
again, the rust is worn away, making the thin layer of hardened steel thinner.
The worst wear points, of course, are the tips of the lobes. Once the hardened
steel wears through, the softer steel underneath goes pretty rapidly.


The automotive world tried out roller lifters a long time ago. They
would work fine in aircraft engines too. I've heard that some of the
engines built for the homebuilt market can and do incorporate roller
lifters. I even thought I read that at least one company was
intending to certify such an engine.

Corky Scott


Lycoming is starting to offer roller tappets. The crankcase has
different bores for the tappets, so an upgrade to the roller tappets
requires a new crankcase, as well as a different cam, different tappets,
pushrods, pushrod tubes and seals. They are not offering a retrofit to
the older narrow deck engines like mine.

"Longworth" wrote in message
ups.com...
Pete,
I have read and participate in r.a.s for the last few years. The
newsgroup is not 'restricted' to primary students.

I never said it was. Please don't put words in my mouth. It does nothing
to support your point, and makes you look dishonest.

[...]
Any perceived problem with cross postings of on-topic subject is
quite insignificant in comparison to the numerous off topic, thread
hijacking branching out to politic and religious discussions seen at
rec.avatiation newgroups!

Your statement is quite ironic, given how this thread got hijacked into a
r.a.owning issue ("engine making metal"). IMHO, that's a perfect
illustration why excessive cross-posting is such a problem (never mind the
divergent threads that wouldn't be on-topic in any rec.aviation.*
newsgroup).

Your other statements are classic slippery-slope logic. The fact is, lots
of topics would be of possible interest to many if not all of the people who
frequent the various rec.aviation.* newsgroups. Unfortunately for your
argument, that's not justification for posting messages on those topics.

Pete

Pete,
My post is in reference to several points that you made below.

Regarding thread hijacking, I don't have problems with thread
branching out to other topics. Using google, at least the branch was
labeled Engine making metal. It is not the same as branching or
hijacking to non-aviation related discussions on politics and
religions.

I think I have sufficiently expressed my opinion on cross postings
and off-topic subject and do not wish to engage in any further
discussions here to conserve bandwidth.

Hai Longworth



================================================== =========================

Weather is taught to VFR primary students, why not icing?



Because they have enough to learn already?

Seriously though, a primary student's knowledge of icing need not
extend
much further than "don't fly when freezing rain is forecast". For
extra
credit, a short discussion of what causes freezing rain might be called
for.


Most icing occurs inside a cloud, and VFR pilots should not have to
worry
about that, or anything else that might happen inside a cloud.


But more importantly (and more to the point) the r.a.student newsgroup
is
more about the process of learning to fly, and especially as it applies
to
primary students
.....

Pete

Pete,
I do not wish to engage in any disputes with you. I use single
quotation mark around the word 'restricted' and not double quotation
mark.
According to this website

http://www.grammartips.homestead.com...ationmark.html

" single quotation marks for words that are not actual quotations but
that are being set off for some other reason"

I just simply expressed my opinion that Jim's post is appropriate in
rec.aviation.student group.

Hai Longworth

"Longworth" wrote in message
oups.com...
Pete,
I do not wish to engage in any disputes with you.

That clearly is false.

I use single
quotation mark around the word 'restricted' and not double quotation
mark.

Well, if there were some official specification that prohibited the use of
single quotation marks for quotation here on Usenet, that might make a
difference.

In any case, whether you are literally quoting or simply mischaracterizing
what I wrote, it's "putting words into my mouth".

According to this website

http://www.grammartips.homestead.com...ationmark.html

" single quotation marks for words that are not actual quotations but
that are being set off for some other reason"

Wonderful. When you get that standard to be the official policy on Usenet,
you let me know.

I just simply expressed my opinion that Jim's post is appropriate in
rec.aviation.student group.

No, you did more than that.

Pete

Nice tap dance there Pete, but she's got you cold on that one!

Suggest you stop blaming her for your misinterpretation of what she
wrote.

--
Cheers,
John Clonts
Temple, Texas
N7NZ

Get over it, Mr. Duniho......you are all wet! Move on....


On Mon, 9 Jan 2006 13:52:59 -0800, "Peter Duniho"
wrote:

"Longworth" wrote in message
roups.com...
Pete,
I do not wish to engage in any disputes with you.

That clearly is false.

I use single
quotation mark around the word 'restricted' and not double quotation
mark.

Well, if there were some official specification that prohibited the use of
single quotation marks for quotation here on Usenet, that might make a
difference.

In any case, whether you are literally quoting or simply mischaracterizing
what I wrote, it's "putting words into my mouth".

According to this website

http://www.grammartips.homestead.com...ationmark.html

" single quotation marks for words that are not actual quotations but
that are being set off for some other reason"

Wonderful. When you get that standard to be the official policy on Usenet,
you let me know.

I just simply expressed my opinion that Jim's post is appropriate in
rec.aviation.student group.

No, you did more than that.

Pete

"Jim Macklin" wrote in message
news:7ilwf.41026$QW2.13106@dukeread08...
I'll buy that, always best to use specific data rather than
a generic answer. It takes a pretty good eye and tach to
see 5 rpm.



Sure does. And a digital tach may flicker that much. Sometimes it is
called a "barely perceptible rise".

Some say it is easier to observe a rise in MP than such a small RPM rise,
and that is borne out by my observation.
The MP will rise one to two inches, and the MP gauge seems to be more stable
than the tach.

If the mixture is set to spec, it is not necessary to lean for ground ops,
since it is already lean enough to prevent plug fouling. Ground leaning is
effective only if leaned back to the edge of idle cutoff, anyway.

The Lycoming manual doesn't seem to have any tables for adjusting RPM rise
for density altitude. If it is leaned to the 5RPM rise spec at a high
altitude airport, I wonder if it might be too lean at a low-altitude
airport, with no way to enrichen it.

Stan

I flew a demo in a BE 58P Baron into a high altitude
private strip in the Wyoming mountains,


A-A Ranch Airport is an airport in Carbon County,
Wyoming. It has an elevation of 7,880 feet.

With the Continental fuel injection, being the
mechanical constant displacement type, the engines died when
they were set to idle during the landing because they were
too rich and then turbos had spun down. This was a problem
because the runway looked like a ski-jump and I was half way
up the hill. I was able to hold the brakes and get it
started again and manually leaned the mixture to about 1/2
travel on the lever and taxi up the hill to the level ramp
area. Of course you have to keep it full rich in case of a
go-around, so I learned a lesson that was not in the manual,
as soon as touching down, mixture reduce, throttle reduce.
For take-off run up to 2000 RPM then full rich.
I much preferred the Bendix injection because it is
metered by ambient fuel and air pressure, so the mixture is
more stable and self-leaning. I love the PT6 even better.


--
James H. Macklin
ATP,CFI,A&P

--
The people think the Constitution protects their
rights;
But government sees it as an obstacle to be overcome.
some support
http://www.usdoj.gov/olc/secondamendment2.htm
See http://www.fija.org/ more about your rights and
duties.







"Stan Prevost" wrote in message
...
|
| "Jim Macklin" wrote
in message
| news:7ilwf.41026$QW2.13106@dukeread08...
| I'll buy that, always best to use specific data rather
than
| a generic answer. It takes a pretty good eye and tach
to
| see 5 rpm.
|
|
|
| Sure does. And a digital tach may flicker that much.
Sometimes it is
| called a "barely perceptible rise".
|
| Some say it is easier to observe a rise in MP than such a
small RPM rise,
| and that is borne out by my observation.
| The MP will rise one to two inches, and the MP gauge seems
to be more stable
| than the tach.
|
| If the mixture is set to spec, it is not necessary to lean
for ground ops,
| since it is already lean enough to prevent plug fouling.
Ground leaning is
| effective only if leaned back to the edge of idle cutoff,
anyway.
|
| The Lycoming manual doesn't seem to have any tables for
adjusting RPM rise
| for density altitude. If it is leaned to the 5RPM rise
spec at a high
| altitude airport, I wonder if it might be too lean at a
low-altitude
| airport, with no way to enrichen it.
|
| Stan
|
|