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Lorn,
Efficient little suckers, aren't they?
I don't have any recent precisely comparable numbers but here are some
from my April trip to SNF (actually, the return, 30 minutes NW of KGAD):
WOT, 10550 MSL, 11360 Dalt, 10C, 21.5" MAP, 2500 RPM, ~100F ROP, 8.3 GPH,
27 DBTDC === 168 KIAS, 198 KTAS, 193 Kts Ground Speed. I was in a hurry to
get home.
The previous April on my way to Austin, TX (to 3R9 from KARR, I did not
want to stop for fuel) and over Lebanon, MO:
WOT, 8500 MSL, 8240 Dalt, 2C, 23.3" MAP, 2480 RPM, ~20-30F LOP, 6.9 GPH,
timing not recorded === 171 KIAS, 193 KTAS, 208 Kts Ground Speed. Block to
Block 4 hr 25 min and 31 gallons used (avg 7.05 GPH over 826
NM and 30.7 SM per Gallon). Wow!
Scott Krueger
IO 320
TAS is from my on board air data computer.
In a message dated 6/25/2010 1:00:17 P.M. Central Daylight Time,
lorn@dynacomm.us writes:
06/22/10
I was flying from Detroit to Ft Lauderdale at 11,000. With nothing else to do,
I thought that I would take a few measurements.
Condition LOP Lo ROP Hi
--------- -------- ---------
11,000
IA 2,350RPM 2,700 RPM
13,000
DA 19.3"MP 19.8"MP
30.08
"Hg 6.0 GPH 8.6 GPH
12°C
temp 139 kts IAS 152 kts IAS
35°F dewpt? 168 kts
TAS 183 kts TAS
1,670 lbs
For a 43% increase in fuel,
a 9% increase in airspeed doesn't sound like much. However, 183 kts airspeed
at 13,000 ft density altitude, no matter how you do it, is great.
The
LOP reading at .435 BSFC comes out to HP = 36 * 6 * .435 = 94.0 HP or 94.0 /
160 = 59% power.
Comments appreciated.
Lorn
--
Lorn H.
'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp.,
248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,700 hrs,
N31161, Y47, SE Michigan
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