Run up for plug clearing

You can't be serious as to not know the difference between a POH and an owners'
manual, can you?

Jim



Larry Dighera
shared these priceless pearls of wisdom:

-On Sun, 10 Oct 2004 06:21:11 -0400, Cub Driver
wrote in
::
-
-
-There is a POH for every plane.
-
-If only this were true! I would love to have a POH for the 1946 J-3
-Cub that I fly.
-
-
-Owner's Manual for Cub Special J-3C-65……………..………$10.00
-http://www.cub-club.com/Printed72303.doc
-
-Here's a CD with 8 different Cub manuals:
-http://www.flight-manuals-on-cd.com/Cub.html
-
-There's one he
-http://www.aeroplanebooks.com/seriesPilot.htm
-
-Piper Cub J-3 Service Manual
-http://www.historicaviation.com/historicaviation/product_info.po;jsessionid=vE63PPu_0M-U90wTx3XdDKst(0CpplRPt)?ID=1544
-http://www.xs4all.nl/~aviation/books3.html
-http://www.texair.com/rfq/catalog-P.asp



Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com

Peter,

Your opinion is that it sucks. But thankfully, your opinion is not the
written Gospel.


Of course not. Neither is yours. Is ANYONE here spreading more than his or
her opinion? But thanks for pointing out the very basics. Maybe you needed
the reminder. I didn't.

Where, pray, tell, are your statements less absolute than mine?

And no, I don't use OE.

--
Thomas Borchert (EDDH)

Peter,

Your opinion is that it sucks. But thankfully, your opinion is not the
written Gospel.


Of course not. Neither is yours. Is ANYONE here spreading more than his or
her opinion? But thanks for pointing out the very basics. Maybe you needed
the reminder. I didn't.

Where, pray, tell, are your statements less absolute than mine?

And no, I don't use OE.

--
Thomas Borchert (EDDH)

On Sun, 10 Oct 2004 09:54:08 -0700, Jim Weir wrote:

You can't be serious as to not know the difference between a POH and an owners'
manual, can you?

Huh?

Kindly point me to either a POH or an owner's manual for the J-3 Cub.

I don't know the difference! How can there be a difference between two
things that don't exist?


all the best -- Dan Ford
email: (put Cubdriver in subject line)

Warbird's Forum www.warbirdforum.com
Piper Cub Forum www.pipercubforum.com
Viva Bush! www.vivabush.org

On Sun, 10 Oct 2004 09:54:08 -0700, Jim Weir wrote:

You can't be serious as to not know the difference between a POH and an owners'
manual, can you?

Huh?

Kindly point me to either a POH or an owner's manual for the J-3 Cub.

I don't know the difference! How can there be a difference between two
things that don't exist?


all the best -- Dan Ford
email: (put Cubdriver in subject line)

Warbird's Forum www.warbirdforum.com
Piper Cub Forum www.pipercubforum.com
Viva Bush! www.vivabush.org

On Mon, 11 Oct 2004 05:12:31 -0400, Cub Driver
wrote in
::

Kindly point me to either a POH or an owner's manual for the J-3 Cub.

http://groups.google.com/groups?safe...m%3E&lr=&hl=en

On Mon, 11 Oct 2004 05:12:31 -0400, Cub Driver
wrote in
::

Kindly point me to either a POH or an owner's manual for the J-3 Cub.

http://groups.google.com/groups?safe...m%3E&lr=&hl=en

(Robert M. Gary) wrote in message . com...
For the engine, the higher the RPM the better. However, 1800 is used
because its a high RPM but doesn't suck as many rocks into the prop as
full RPM. If you run up to full RPM everytime you'll send up replacing
your prop every annual.

-Robert

1800 (or 1700 or even 1600 in other installations) is selected
because that's where cylinder pressures are highest for the static
condition. Lower RPMs give lower pressures because the throttle is
closed too much, and higher revs will give slightly lower pressures
because the volumetric efficiency of the engine is beginning to drop
off (there's too much friction in the intake and exhaust systems). At
highest cylinder pressures weak mags or sparkplugs are most likely to
cut out, which is what we're checking for.

Dan



"Roger Long" wrote in message ...
I can't remember where I "learned" it but I always thought 1800 RPM was the
limit for ground running leaned to clear plugs. I had a really bad one
yesterday with 250 RPM drop. I taxied back to the shop and they said to try
full throttle before pulling the plugs.

It worked but running the engine full power (near sea level) while leaned
for best power and peak EGT with minimum airflow for the minute it took
seems pretty abusive to me. Maybe you can get away with it because the
CHT's have not yet risen to max.

Any thoughts? What were you taught?

(Robert M. Gary) wrote in message . com...
For the engine, the higher the RPM the better. However, 1800 is used
because its a high RPM but doesn't suck as many rocks into the prop as
full RPM. If you run up to full RPM everytime you'll send up replacing
your prop every annual.

-Robert

1800 (or 1700 or even 1600 in other installations) is selected
because that's where cylinder pressures are highest for the static
condition. Lower RPMs give lower pressures because the throttle is
closed too much, and higher revs will give slightly lower pressures
because the volumetric efficiency of the engine is beginning to drop
off (there's too much friction in the intake and exhaust systems). At
highest cylinder pressures weak mags or sparkplugs are most likely to
cut out, which is what we're checking for.

Dan



"Roger Long" wrote in message ...
I can't remember where I "learned" it but I always thought 1800 RPM was the
limit for ground running leaned to clear plugs. I had a really bad one
yesterday with 250 RPM drop. I taxied back to the shop and they said to try
full throttle before pulling the plugs.

It worked but running the engine full power (near sea level) while leaned
for best power and peak EGT with minimum airflow for the minute it took
seems pretty abusive to me. Maybe you can get away with it because the
CHT's have not yet risen to max.

Any thoughts? What were you taught?

"Thomas Borchert" wrote in message
...
Of course not. Neither is yours. Is ANYONE here spreading more than his or
her opinion? But thanks for pointing out the very basics. Maybe you needed
the reminder. I didn't.

You did, and it appears you still do.

Where, pray, tell, are your statements less absolute than mine?

They are statements of fact, regarding what you can and cannot do in OE.
Your statements, on the other hand, are statements of opinion, stated *as if
they were fact*, when in fact they are not.

And no, I don't use OE.

I know you don't. That's why I wrote that you don't.

Pete