REFLECTOR: Performance

Kurt Winker nmflyer1 at aol.com
Wed May 8 22:19:17 CDT 2013


Really hope those should have been GPH...  ;)

KW

Sent from my iPad

On May 8, 2013, at 16:50, Brent Bourgeois <bjb3013 at yahoo.com> wrote:

> Geoff,
>  
> Flying 17 years 
> Std RG IFR ,IO360 200hp, 1 pmag, 3 blade Catto 2300 static rpm, ram air and armpit scoops
>  
> Max Speed: 2900 rpm, 1000ft, 150 deg ROP 17+ gpm, 218mph verified many times flying a 4 sided box with gps avg.
>  
> Cruise: 2600rpm 10,000ft, 50 deg LOP, 7.9 gpm, 198mph, flying a 4 sided box with gps avg.
>  
> Usually fly locally just for enjoyment: 5 gpm, LOP 135 kts
> 
> 
> Brent 
> N61VB (check http://aprs.fi/#!call=a%2FN61VB&timerange=21600&tail=3600 for tracking)
> New Orleans La
> 985-785-8299
> 
> From: Geoff Gerhardt <geoff.gerhardt at gmail.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org> 
> Sent: Wednesday, May 8, 2013 9:38 AM
> Subject: REFLECTOR: Performance
> 
> Folks,
> 
> I'm getting pretty consistent performance out of my 173RG over the last 8-9 months since initial flight testing.  My question to you guys is, are the performance numbers I'm seeing typical, or should I be seeing better performance?  Normally, on a cross country, I'll fly b/w ~8-12,000', ~60deg LOP which typically has me going 150kias at 8-8.5gph.  Full power, 160kias is about my max speed.  
> 
> I have a fixed-pitch Catto prop (66x74, design target 200mph @ 2800RPM).  When I'm doing 160kts, my prop is spinning at ~2800RPM.  That tells me that I have the power to spin the prop, but may have air frame drag that's keeping me from seeing the 200mph predicted by Catto at 2800RPM.
> 
> I have a standard 200hp, Lyc IO-360, Lightspeed EI on one side, Mag on the other.  Timing as per spec for both EI and Mag.  About 90hrs on the engine (rebuilt).  Compression/oil consumption is normal.  Very stable performance from the engine.
> 
> My plane is fully finished and pretty tight.  Main/nose gear doors are not hanging out and are reasonably well tucked in when the gear is raised.  Main wing angles of incidence are spot on, no rudder trimming was necessary to center the ball - she flies nice and straight.
> 
> The factory predicts I should be able to cruise at 175kias - that's just not possible with my current setup.  Can others with Std Velocities relate the performance you are seeing?  Is this as good as it gets, or does anyone have suggestions for things to check to see if I can eek out a bit more speed?
> 
> Thanks.
> 
> Geoff
> 
> 
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