They are not clickable in my MS = Outlook.

From: = Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Colyn Case
Sent: Tuesday, August 12, = 2014 11:41 AM
To: Lancair Mailing = List
Subject: [LML] Re: Fwd: = John Deakin on climbing with a tsio-550

I had to size them down a bit to get by Marv but if you double = click them you should be able to view them in a pre-viewer and get them to a = legible size.

On Aug 12, 2014, at 9:25 AM, Bill Bradburry = wrote:

Those landmark charts are not = really legible. Can they be blown up for better = understanding?

Can they be found somewhere with an explanation attached?

From: = Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Colyn Case
Sent: Monday, August 11, = 2014 2:13 PM
To: Lancair Mailing List
Subject: [LML] Fwd: John = Deakin on climbing with a tsio-550

fyi - I put the question to John. Here's what I got = back.

Begin forwarded = message:

From: John Deakin <jdeakin@advancedpilot.com&g= t;

Date: August 11, 2014 2:33:16 PM EDT

To: Colyn Case at earthlink <colyncase@earthlink.net>

Subject: Re: climb with a = tsio-550

Are you still answering aps = questions?

You bet! = <grin>

With a tsio-550 you have these = interactions:

- decreasing rpm moves theta-pp back toward = TDC

- decreasing MP if mixture = were constant moves theta-pp away from = TDC

- decreasing throttle from max reduces = mixture

Do you have any idea of the magnitudes of these = effects?

For magnitude, I can only refer to the “Landmarks” = chart (see below). It doesn’t directly address your question, = though.

We’ve long suggested 200 RPM off takeoff power for noise = reduction. It’s not exactly good for the engine, but it won’t do = any harm. Better chance of harm of the TSIOs and TIOs, but still pretty = benign.

Then George did some noise certification work for the FAA, which involved heavy instrumentation of the Ada airport and surroundings. He got a lot of interesting data! = One item was with only 100 RPM off the top end you get 90% of the noise = reduction you get with 200 off!

So full takeoff power from LIMITATIONs, reduced by 100 RPM for = noise. Very, very minor effect. Now, if you’re talking big = radials at 60” MP, and often operating in detonation, that’s another = story!

It is also commonly thought that reducing MP to 31 inches and = rpm to 2500 is easier on the engine.

So far as I can tell, this is NOT = true.

You are correct! NOT true. Full power to cruise = altitude, UNLESS there is a time limit on full power IN = LIMITATIONS.

Best...

John Deakin
jdeakin@advancedpilot.com www.advancedpilot.com

Next LIVE seminar in Ada OK, 10/24/2014

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