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Speedy11(at)aol.com
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 Posted: Sun Apr 17, 2011 1:43 pm Post subject: Nice Tailwind |
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FYI - just got home from the Texhoma 100 Air Race. The race was fun and lots of nice people participating.
On my flight back to Florida, I averaged 200 knots GS at 11,500 and 13,500 thanks to a nice tailwind. Some segments of the flight were at 210 knot GS. A long trip is a lot better when you can go fast.
A rundown of my numbers -
Alt - 11,500
2410 RPM
19.8" MP
9.7 FF
144 KIAS
174 KTAS
200 GS
Alt - 13,500
2300 RPM
18.4" MP
10.3 FF
136 KIAS
169 KTAS
200 GS
I just can't get the low FF numbers that some guys are getting. I leaned until LOP and the engine began to stumble. I enrichened back to smooth and peak to get the FF numbers above.
Stan Sutterfield
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tracy(at)rotaryaviation.c
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| Posted: Sun Apr 17, 2011 2:12 pm Post subject: Nice Tailwind |
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Hmmmm.... Lower RPM, MP and TAS but higher fuel flow. Something is very wrong. Are you sure? 2000 ft higher would not explain this. Maybe mixture distribution problems?
Tracy Crook
On Sun, Apr 17, 2011 at 5:40 PM, <Speedy11(at)aol.com (Speedy11(at)aol.com)> wrote:
| Quote: | FYI - just got home from the Texhoma 100 Air Race. The race was fun and lots of nice people participating.
On my flight back to Florida, I averaged 200 knots GS at 11,500 and 13,500 thanks to a nice tailwind. Some segments of the flight were at 210 knot GS. A long trip is a lot better when you can go fast.
A rundown of my numbers -
Alt - 11,500
2410 RPM
19.8" MP
9.7 FF
144 KIAS
174 KTAS
200 GS
Alt - 13,500
2300 RPM
18.4" MP
10.3 FF
136 KIAS
169 KTAS
200 GS
I just can't get the low FF numbers that some guys are getting. I leaned until LOP and the engine began to stumble. I enrichened back to smooth and peak to get the FF numbers above.
Stan Sutterfield
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et="_blank">http://www.matronics.com/Navigator?RV8-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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| | - The Matronics RV8-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Speedy11(at)aol.com
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| Posted: Mon Apr 18, 2011 5:40 am Post subject: Nice Tailwind |
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Yeah, Tracy. I noted that while airborne. It made no sense to me, but each time I tried to lean to 9.2 GPH like I had used on the trip 3 days before (same power setting) the engine began to stumble and lose power. To run smooth I had to bump the FF back up to 10.3. Didn't make sense to me but I didn't have time to analyze it at the time.
I'll gather some more cruise number for comparison.
Stan
In a message dated 4/18/2011 3:05:24 A.M. Eastern Daylight Time, rv8-list(at)matronics.com writes:
| Quote: | Hmmmm.... Lower RPM, MP and TAS but higher fuel flow. Something is very
wrong. Are you sure? 2000 ft higher would not explain this. Maybe
mixture distribution problems?
|
[quote][b]
| | - The Matronics RV8-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV8-List |
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