A aviation & planes forum. AviationBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AviationBanter forum » rec.aviation newsgroups » Piloting
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Need A Definition



 
 
Thread Tools Display Modes
  #1  
Old May 10th 04, 08:44 AM
Jay Beckman
external usenet poster
 
Posts: n/a
Default Need A Definition

Hi All...

I came across a term the other day I'm not familiar with...

Back in WWII, when a new plane came off the assembly line, a WAC would take
it up and "Slow Time" it.

What was/is "Slow Timing" an airplane?

Was it for single-engine fighters only, or was this something done to all
aircraft?

TIA,

Jay Beckman
Student Pilot - KCHD
17.4 Hrs ... Nowhere to go but up!


  #2  
Old May 10th 04, 04:19 PM
C J Campbell
external usenet poster
 
Posts: n/a
Default


"Jay Beckman" wrote in message
news:[email protected]
Hi All...

I came across a term the other day I'm not familiar with...

Back in WWII, when a new plane came off the assembly line, a WAC would

take
it up and "Slow Time" it.

What was/is "Slow Timing" an airplane?

Was it for single-engine fighters only, or was this something done to all
aircraft?


It was running the engine at reduced power to break it in after maintenance
had been performed on it. It was done even after such simple measures as
cleaning and gapping the spark plugs. You did not want to introduce the
engine to the high stress of combat flying until it had been run in for a
few hours. Slow-timing was not necessarily done in flight; there are
paintings and photos of rows of B-17s all sitting on the ramp slow-timing
their engines.

The engine was not run at a constant speed, but varied, and sometimes run on
just one magneto for periods of up to one minute (you can get an argument
going about whether running on one mag is good or bad for the engine).
Although all airplanes needed slow-timing, temperamental aircraft such as
the P-51 needed it more.

Modern engines still require a break-in period, using mineral oil for the
first 50 hours or so. It is still a good idea to slow-time a new engine on a
trainer aircraft, avoiding maneuvers such as touch and goes for a few hours
until the engine is broken in.


  #3  
Old May 10th 04, 07:38 PM
Jay Beckman
external usenet poster
 
Posts: n/a
Default

"C J Campbell" wrote in message
...

"Jay Beckman" wrote in message
news:[email protected]
Hi All...

I came across a term the other day I'm not familiar with...

Back in WWII, when a new plane came off the assembly line, a WAC would

take
it up and "Slow Time" it.

What was/is "Slow Timing" an airplane?

Was it for single-engine fighters only, or was this something done to

all
aircraft?


It was running the engine at reduced power to break it in after

maintenance
had been performed on it. It was done even after such simple measures as
cleaning and gapping the spark plugs. You did not want to introduce the
engine to the high stress of combat flying until it had been run in for a
few hours. Slow-timing was not necessarily done in flight; there are
paintings and photos of rows of B-17s all sitting on the ramp slow-timing
their engines.

The engine was not run at a constant speed, but varied, and sometimes run

on
just one magneto for periods of up to one minute (you can get an argument
going about whether running on one mag is good or bad for the engine).
Although all airplanes needed slow-timing, temperamental aircraft such as
the P-51 needed it more.

Modern engines still require a break-in period, using mineral oil for the
first 50 hours or so. It is still a good idea to slow-time a new engine on

a
trainer aircraft, avoiding maneuvers such as touch and goes for a few

hours
until the engine is broken in.



Thanks C J

Now I know!

Jay


  #4  
Old May 10th 04, 10:30 PM
Jay Honeck
external usenet poster
 
Posts: n/a
Default

few hours. Slow-timing was not necessarily done in flight; there are
paintings and photos of rows of B-17s all sitting on the ramp slow-timing
their engines.


Can't you just imagine the glorious cacophony of sound coming from all of
those wonderful radial engines?

Man, to have witnessed that would have been something...
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"


  #5  
Old May 11th 04, 04:41 PM
Big John
external usenet poster
 
Posts: n/a
Default

CJ

All ever heard on "slow timing" (and I flew a number of missions like
that) was airborne flight. May have been some extended running on
ground but don't beleive it was called "slow timing".

Extenced running on the ground (both lqiuid and air cooled) did not
give same cooling as during flight.

Those missions were rather boring (round and round the flag pole) and
lots of pilots made excuses to not fly and others had to do the 'dirty
deed' )

Your corrrect on power setting. We would run at slow cruise for maybe
30 minutes and then full throttle for 5 minutes and then back to slow
cruise. I forget but times may have been different (10 minutes slow
cruise - one minute full throtle, etc., etc.)?

Y'all have a nice day.

Big John
`````````````````````````````````````````````````` ``````````````````````

On Mon, 10 May 2004 08:19:06 -0700, "C J Campbell"
wrote:


"Jay Beckman" wrote in message
news:[email protected]
Hi All...

I came across a term the other day I'm not familiar with...

Back in WWII, when a new plane came off the assembly line, a WAC would

take
it up and "Slow Time" it.

What was/is "Slow Timing" an airplane?

Was it for single-engine fighters only, or was this something done to all
aircraft?


It was running the engine at reduced power to break it in after maintenance
had been performed on it. It was done even after such simple measures as
cleaning and gapping the spark plugs. You did not want to introduce the
engine to the high stress of combat flying until it had been run in for a
few hours. Slow-timing was not necessarily done in flight; there are
paintings and photos of rows of B-17s all sitting on the ramp slow-timing
their engines.

The engine was not run at a constant speed, but varied, and sometimes run on
just one magneto for periods of up to one minute (you can get an argument
going about whether running on one mag is good or bad for the engine).
Although all airplanes needed slow-timing, temperamental aircraft such as
the P-51 needed it more.

Modern engines still require a break-in period, using mineral oil for the
first 50 hours or so. It is still a good idea to slow-time a new engine on a
trainer aircraft, avoiding maneuvers such as touch and goes for a few hours
until the engine is broken in.


 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Pilot's Political Orientation Chicken Bone Instrument Flight Rules 317 June 21st 04 06:10 PM
Pilot's Political Orientation Chicken Bone Owning 314 June 21st 04 06:10 PM
definition of "dual controls" Lee Elson Instrument Flight Rules 4 April 24th 04 02:58 PM
Commercial dual crosscountry definition David Brooks Piloting 20 February 6th 04 06:23 PM
Logging x/c time and definition of landing Koopas Ly Piloting 20 November 25th 03 08:41 PM


All times are GMT +1. The time now is 10:50 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Copyright 2004-2022 AviationBanter.
The comments are property of their posters.