REFLECTOR:One Fast Velocity

[Scott Derrick]

I routinely cruise around 10,000ft, 2700 RPM,  9.5 GPH at 170-175 
KTAS(depends on temp)

Std-RG, IO360 with a fixed pitch Catto prop.  If I had an adjustable I 
could go faster at a higher burn.

Scott

At 09:25 PM 6/1/2004, you wrote:
>On Monday I went up with my friend Mike Deeter to collect some flight
>performance data.
>I must say that the Franklin and IVO prop make a screaming combination for
>not a lot of $$$.
>Its a standard elite RG.  Carbureted/magneto Franklin, electric IVO.
>Nothing special.
>
>I wanted to get more data, but clouds below 5000 was a problem.
>
>The best speed we saw was at 7500 feet altitude, full throttle, the first
>altitude where we actually
>achieved full open throttle.
>182KTS TAS, 2520 RPM, 23.1 inches MAP, 12.4GPH.
>
>I was more impressed however, with putting more pitch in the prop.  At this
>same altitude, I took data at progressively slower RPM's (same throttle).
>174KTS TAS, 2300 RPM, 23.5 inches MAP, 10.8GPH.
>
>We stabilized a climb through 8000 feet at 120 kts indicated, 144kts true at
>700FPM rate.
>
>Levelling at 9000, going through various MAP/RPM settings, I was impressed
>by the economies achieved:
>         KTS TAS RPM     MAP     GPH
>1       147             2370    19.7    9.5
>2       180             2520    21.8    12
>3       175             2400    21.9    11.2
>4       162             2200    22.1    9.9
>
>At line 1, this is at 120 kts indicated (where I started data collection),
>147TAS.  This is partial throttle operation.  Not bad for 9.5GPH, but look
>at line 4, full throttle, slower RPM.  Faster speed, with just a little more
>fuel flow.  I find it surprising that pumping losses account for a 5%
>penalty between lines 1 and 4.  That's 15.5 nautical miles/gal and 16.4
>nautical miles/gal for lines 1 and 4.
>
>The most economical was at 7500 feet:
>174KTS TAS      2300RPM 23.5MAP 10.8GPH, making that 16.1 nm/gallon.  I don't
>know why I didn't get at data point at 2200RPM.  It would have been better
>yet.
>What this says to me is pick a MAP/RPM combo that is the economy setting you
>want, then fly the altitude that will give you that power setting at WOT.
>
>It was hot too.  95F on the ground, adding about 3000' for density altitude.
>I love this stuff.  Can't wait to go back up and get more data to fill out
>the chart.
>This data makes flying a Warrior look expensive.
>
>  Brian Michalk  <http://www.michalk.com>
>Life is what you make of it ... never wish you had done something.
>Aviator, experimental aircraft builder, motorcyclist, SCUBA diver
>musician, home-brewer, entrepreneur and barely single
>
>
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