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 Post subject: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 16:24 
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I'm trying to find out what those with the TA TN package see for real world cruise speeds in the low teens. We're considering the conversion for a late model 36, but there's a TA TN'ed G36 on the field that claims he only sees 175 KTAS at 12000'. Something doesn't seem right. I've read all the marketing, what's the real story?

CL


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 Post subject: Re: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 16:45 
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This is what you should get or better if the aircraft is properly set up and operated.


Please login or Register for a free account via the link in the red bar above to download files.

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 Post subject: Re: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 16:46 
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Chris, I've flown several different TN A36s. Depending on year variant, and on weight, I've seen anywhere from 190 KTAS (True, not indicated) on a later model, heavy, at 12000 ft up to 207 KTAS on an earlier TN A36 up at 16,000.


Also has some variation with the quality of baffling on a particular plane (one I flew the limiting factor was CHT), the outside air temp, and how far LOP you want to run.


A reasonable assumption, IMO, is somewhere between 195 and 200 kts true airspeed. You can sometimes go "further faster" by running further LOP, burning less gas, and going a little slower....and skipping a fuel stop. There is no better speed mod for a point to point flight than skipping a fuel stop (safely, of course). Slow down, go faster.

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 Post subject: Re: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 16:48 
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My TN meets and actually exceeds the numbers posted by Eric. At 10,000 I get 179 kts at 85% power settings.
Neil Keller

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 Post subject: Re: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 17:00 
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Username Protected wrote:
My TN meets and actually exceeds the numbers posted by Eric. At 10,000 I get 179 kts at 85% power settings.
Neil Keller


Neil,

Your numbers exceed Eric's because of location. All the heavier air sinks to the bottom of the globe and makes it slower down under.......... :rofl:


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 Post subject: Re: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 17:05 
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Eric, did you put that chart together or did you get it from TAT? Very nice.


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 Post subject: Re: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 17:08 
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seems to me that the basic performance numbers are as follows:

x+15kts, y-3gph and z+400lb

where x,y and z are the numbers of whatever aircraft you've asked it be compared to :duck:

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 Post subject: Re: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 17:12 
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Username Protected wrote:
I'm trying to find out what those with the TA TN package see for real world cruise speeds in the low teens. We're considering the conversion for a late model 36, but there's a TA TN'ed G36 on the field that claims he only sees 175 KTAS at 12000'. Something doesn't seem right. I've read all the marketing, what's the real story?

CL

That's pretty slow. Do you know what he's using for power settings?

I see 190 - 195 at 12000 running 87% power (WOT, 2500rpm, 17.5 gph FF).


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 Post subject: Re: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 18:32 
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Username Protected wrote:
Eric, did you put that chart together or did you get it from TAT? Very nice.


Jeff,

That is Bilby Wallace's spreadsheet from TAT. My numbers match this pretty well with the Rammer intercooler. Numbers with the Rammer II may be better than this.

Jon


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 Post subject: Re: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 18:43 
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Username Protected wrote:
seems to me that the basic performance numbers are as follows:

x+15kts, y-3gph and z+400lb

where x,y and z are the numbers of whatever aircraft you've asked it be compared to :duck:


:rofl: :coffee:

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 Post subject: Re: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 19:58 
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Chris, speeds vary big time depending on weight. I am almost always at 4000 lbs. Cruising at 16.5 gph at 10000-12000 I will see 180 KTAS. If it is cool enough that I can maintain 16.5 gph in the high teens, I will see 200-205 KTAS.


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 Post subject: Re: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 20:12 
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The replies are a little more in line with what I've heard in the past. What do you all see with climb rates up to 12-14000' at gross?

CL


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 Post subject: Re: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 21:07 
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Chris,

The TAT TN shines above 8000. Like Ron, I fly my bird at MGW (4000#) most of the time. Above 10K, I can climb at about 500 FPM. When running light say 3400# my old gal will climb easily at 700 to 800 FPM into the high teens.

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 Post subject: Re: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 22:56 
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Username Protected wrote:
That is Bilby Wallace's spreadsheet from TAT. My numbers match this pretty well with the Rammer intercooler. Numbers with the Rammer II may be better than this.

Jon


I noted the numbers are at 3600LB gross weight. Has anyone created a similar chart for weights up near the top of their STC weight of 4,000LB. ?

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 Post subject: Re: Real world Tornado Alley TN performance numbers
PostPosted: 23 Sep 2010, 23:02 
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Aircraft: 1976 Bonanza V35TN
Chris,
The 175kts at 12k seem right if he's burning about 14-14.5 gal/hr and heavily loaded. I see that number at about 13.5 gal/hr and 3600lbs....gotta pay the fuelman to go faster...hence why I was burning 16.6 gal/hr for a while...

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