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Search: Posts Made By: Walter Atkinson
Forum: Messages 01-11-14, 02:38 PM
Replies: 30
Views: 51,174
Posted By Walter Atkinson
Yes. Sounds like they may have forgotten to...

Yes.


Sounds like they may have forgotten to include the exhaust back pressure effects in their calculations. Not sure how they got their numbers.
Forum: Messages 01-10-14, 06:27 PM
Replies: 30
Views: 51,174
Posted By Walter Atkinson
The engine test stand data confirmed the math! ...

The engine test stand data confirmed the math! This is a very good "rule of thumb" calculation that can be off a very small amount as other factors do affect the mass airflow. Those differences are...
Forum: Messages 01-07-14, 07:13 PM
Replies: 30
Views: 51,174
Posted By Walter Atkinson
HP calculation ROP (mass...

HP calculation ROP (mass airflow):

(100+(((RPM-maxRPM)/100*2.5)+((MP-maxMP)*3.5)))/100*maxHP.


HP calculation LOP (FF):

NA engines = 14.9 * FF = HP

TC engines = 13.75 * FF = HP
Forum: Messages 01-07-14, 07:05 PM
Replies: 30
Views: 51,174
Posted By Walter Atkinson
From George Braly: INTERCOOLER EXPLANATION: For...

From George Braly:

INTERCOOLER EXPLANATION:

For a year, I spent a good portion of my time re-engineering an intercooler installation and obtaining FAA approval for the changes. Very careful...
Forum: Messages 01-07-14, 07:02 PM
Replies: 30
Views: 51,174
Posted By Walter Atkinson
Gentlemen: Based on the hard data rather than...

Gentlemen:

Based on the hard data rather than people's opinions, there is a tremendous amount of misinformation in this thread concerning HP determination and intercoolers. I will try to address as...
Forum: Messages 10-06-13, 10:39 AM
Replies: 4
Views: 13,531
Posted By Walter Atkinson
If flying NA, optimal leaning to LOP from Best...

If flying NA, optimal leaning to LOP from Best Power will gain you a 3 gph fuel savings (per engine) and cost you 3 knots. If you are losing more than 3-4 knots, the leaning is farther LOP than...
Forum: Messages 04-08-13, 12:06 PM
Replies: 3
Views: 10,747
Posted By Walter Atkinson
Regarding the Mike Busch article referenced...

Regarding the Mike Busch article referenced above. Essentially everything in that article, Mike got from us at APS... with one exception. He does not use EGT as a leaning reference. This is, in...
Forum: Messages 12-11-12, 05:07 PM
Replies: 5
Views: 18,490
Posted By Walter Atkinson
It's an excellent Service INFORMATION Directive. ...

It's an excellent Service INFORMATION Directive. It is not REGULATORY, so you can set the engine up as per the SID, then add FF until the Target EGT is correct. We have found that the best...
Forum: Messages 08-06-12, 06:46 PM
Replies: 11
Views: 18,147
Posted By Walter Atkinson
The most important aspect of adding FF is that...

The most important aspect of adding FF is that it's data be in the engine monitor download. Having each engine's FF individually catalogued is very helpful when troubleshooting engine problems.

Take...
Forum: Messages 04-09-12, 10:14 AM
Replies: 10
Views: 20,540
Posted By Walter Atkinson
I'm betting that the four engine aircraft you now...

I'm betting that the four engine aircraft you now fly internationally is a jet or turbo prop. If so, not running tanks dry is proper.

Piston aircraft are different. The WILL restart in flight if...
Forum: Messages 04-06-12, 12:50 PM
Replies: 10
Views: 20,540
Posted By Walter Atkinson
That sounds stupid to me, too. I disagree. ...

That sounds stupid to me, too.



I disagree. There are a number of reasons to run a TANK dry, but I agree, not the entire engine's fuel. A one hour reserve--ALL IN ONE TANK is the safest...
Forum: Messages 04-05-12, 12:54 PM
Replies: 9
Views: 19,744
Posted By Walter Atkinson
Gentlemen: I spent 1+20 on the phone this...

Gentlemen:

I spent 1+20 on the phone this morning with Dan Broerse of Insight concerning the G3 and the issues that I think should be best addressed to make it a better, more useful instrument. Our...
Forum: Messages 04-04-12, 10:33 PM
Replies: 9
Views: 19,744
Posted By Walter Atkinson
Rick: I think it unreasonable for anyone to...

Rick:

I think it unreasonable for anyone to expect me to visit every aviation internet forum and post such a message. I have been very forthcoming on many internet fora for over a decade about JPI,...
Forum: Messages 04-04-12, 08:56 PM
Replies: 9
Views: 19,744
Posted By Walter Atkinson
Let me repeat: I have owned and flown behind...

Let me repeat: I have owned and flown behind several different Insight monitors. The 602, 603 and 610 as well as the 1200. They were good monitors for their times. I still like the 610.

As far as...
Forum: Messages 04-03-12, 08:19 PM
Replies: 9
Views: 19,744
Posted By Walter Atkinson
My experience is that JPI produces the best...

My experience is that JPI produces the best hardware (next to the Xerion AuRacle) and that EI has the best customer service. Too bad EI won't address their software and owner's manual issues, which...
Forum: Messages 04-03-12, 01:58 PM
Replies: 9
Views: 19,744
Posted By Walter Atkinson
If only your experience with JP were rare...

If only your experience with JP were rare...
Forum: Messages 03-14-12, 09:23 PM
Replies: 10
Views: 20,540
Posted By Walter Atkinson
Excellent advice. I run tanks dry routinely. ...

Excellent advice. I run tanks dry routinely. It's a safety issue. It was SOP in the piston airliners for decades. (There IS a reason not to run tanks dry on turbines. Different animal)

You want...
Forum: Messages 01-20-12, 01:26 PM
Replies: 11
Views: 15,699
Posted By Walter Atkinson
Any engine that has a max power time limitation...

Any engine that has a max power time limitation should be adhered to. If none, max rpm is OK.
Forum: Messages 01-18-12, 08:46 PM
Replies: 11
Views: 15,699
Posted By Walter Atkinson
Ernie: After TESTING various methods in both an...

Ernie:

After TESTING various methods in both an advanced engine test facility and on a very well-instrumented airplane (read pressure transducers, etc) you may be surprised to discover that the...
Forum: Messages 01-05-12, 01:00 AM
Replies: 1
Views: 8,973
Posted By Walter Atkinson
In my educated opinion on the subject, that's...

In my educated opinion on the subject, that's very unlikely to happen.

The only currently viable option I know of able to replace 100LL which would be currently produceable by multiple refineries...
Forum: Messages 12-02-11, 10:48 AM
Replies: 6
Views: 15,172
Posted By Walter Atkinson
Any time. Remember that the best way to test an...

Any time. Remember that the best way to test an ignition system is during an in-flight, high power LOP mag check. Weak plugs will show themselves very early on. Change 'em before they interfere...
Forum: Messages 12-01-11, 06:47 PM
Replies: 6
Views: 15,172
Posted By Walter Atkinson
What you are experiencing is the incipient...

What you are experiencing is the incipient failure of the plug. I have a bushel basket full of plugs that are bad, but TEST good on a bomb test. Replacing plugs that act like this at your earliest...
Forum: Messages 11-30-11, 04:52 PM
Replies: 6
Views: 15,172
Posted By Walter Atkinson
The mags are left-right as viewed from behind the...

The mags are left-right as viewed from behind the engine looking at the prop.

The right mag fires the top plugs on the right side and the bottom plugs on the left side. IOW, the mag fires the top...
Forum: Messages 09-29-11, 01:27 PM
Replies: 32
Views: 89,371
Posted By Walter Atkinson
"Seems" is the operative word in your post. The...

"Seems" is the operative word in your post. The prop issue has been marginally addressed but the cooling drag issue has not been addressed at all. It's that pesky physics. For this reason, the...
Forum: Messages 09-28-11, 06:17 PM
Replies: 32
Views: 89,371
Posted By Walter Atkinson
Two things I don't see discussed about the...

Two things I don't see discussed about the diesels:

1) the HUGE hit they take in additional cooling drag which makes the fuel efficiency not nearly as good as the claims which do not take that drag...
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