REFLECTOR:One Fast Velocity

[Brian Michalk]

One note I did not mention was that all of the data I took, was at full rich
setting so that all of the measurements would be from the same baseline.

> -----Original Message-----
> From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
> Behalf Of Scott Derrick
> Sent: Thursday, June 03, 2004 9:05 AM
> To: reflector@tvbf.org
> Subject: Re: REFLECTOR:One Fast Velocity
>
>
> 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
> >
> >
> >_______________________________________________
> >To change your email address, visit
> >http://www.tvbf.org/mailman/listinfo/reflector
> >
> >Visit the gallery!  www.tvbf.org/gallery
> >user:pw = tvbf:jamaicangoose
> >Check new archives: www.tvbf.org/pipermail
> >Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>
>
> "Those who sacrifice freedom to get security, deserve neither."
> - Benjamin Franklin
>
> _______________________________________________
> To change your email address, visit
http://www.tvbf.org/mailman/listinfo/reflector

Visit the gallery!  www.tvbf.org/gallery
user:pw = tvbf:jamaicangoose
Check new archives: www.tvbf.org/pipermail
Check old archives: http://www.tvbf.org/archives/velocity/maillist.html