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  #21  
Old 02-07-2014, 06:59 PM
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petehowell petehowell is offline
 
Join Date: Jan 2005
Location: MN
Posts: 2,213
Default Seven Wonderful Years!

The annual has been done for a bit, but I forgot to update the numbers.....until today....

She has 1150 hrs now and uses a quart every ~15-20 hrs. Not much has changed, except now I burn mostly mogas (Qu horror!)

Here are the high and low cruise respectively:



Up high, she is really pretty efficient!(31.4smpg at 172smph) From the Moab Trip over the Rockies.....



Cold day to fly, but lotsa fun anyway.... looks like we got a digi issue up north again......
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Amateur Plane - RV-9A N789PH - 2100+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
St. Paul, MN
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  #22  
Old 12-29-2014, 04:44 PM
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petehowell petehowell is offline
 
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Default I know you all have been waiting for year 8 numbers.....

Pretty boring, maybe a touch slower, but it was really cold at -16C. No complaints, still 151KTAS on 6GPH. Running Minnesota winter mogas at $2.37/gallon after road tax rebates and coupon discounts from the local retailer. Works out to be $0.0942/mile. Hello cheapo fun!



Peek-a-boo new CF panel overlay - Vintage Dynon's still doing fine work in the "glass" (giggle-snort) panel.



Cold and clear at 8000......nice day to fly with solar heating.......

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Amateur Plane - RV-9A N789PH - 2100+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
St. Paul, MN
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  #23  
Old 12-29-2014, 05:35 PM
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chazking chazking is offline
 
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Location: State of Bliss
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Default Engine

Pete,

Thanks for the running history. Good info for those of us behind you.

Any changes in the engine numbers? For instance - compression? OH mags ??
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  #24  
Old 12-29-2014, 06:54 PM
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petehowell petehowell is offline
 
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Location: MN
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Default No changes

Hi Chaz,

I do a comp check every 50hr oil change b/c of the ECI cylinder AD. Compressions are 76/78/76/76 as of 1300 hrs. I'll see one down at 72 and then is it right back up next check. I have an E-Mag/P-Mag and a carb, they have all been good for me. I run auto plugs and change them at annual.

Mogas works well for me and we have a good source 91 EtOH-free nearby. 100LL works great too.

I know a -9A is not everyone's cup of tea, but I really enjoy mine.


Quote:
Originally Posted by chazking View Post
Pete,

Thanks for the running history. Good info for those of us behind you.

Any changes in the engine numbers? For instance - compression? OH mags ??
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Pete

Amateur Plane - RV-9A N789PH - 2100+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
St. Paul, MN
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  #25  
Old 12-29-2014, 07:48 PM
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BCP Boys BCP Boys is offline
 
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Default

I'm sure this has been discussed many times before but I have to ask just so I can learn, how are you running LOP on your carbureted engine? I've always been told as a general rule, on a carbureted engine you need to run your engine ROP.

Thanks in advance for sharing.
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  #26  
Old 12-29-2014, 09:24 PM
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petehowell petehowell is offline
 
Join Date: Jan 2005
Location: MN
Posts: 2,213
Default LOP

Hi Amir,

There are some old threads here that will help, but might take some searching. Send me a PM with your phone number and I would be happy to discuss it if you would like.

Ability seems to be engine/prop/carb heat, and timing advance dependent. Might be some magic dust required, too.....

Quote:
Originally Posted by BCP Boys View Post
I'm sure this has been discussed many times before but I have to ask just so I can learn, how are you running LOP on your carbureted engine? I've always been told as a general rule, on a carbureted engine you need to run your engine ROP.

Thanks in advance for sharing.
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Amateur Plane - RV-9A N789PH - 2100+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
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  #27  
Old 01-07-2017, 03:20 PM
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petehowell petehowell is offline
 
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Default Year 10 Performance Numbers!

In the process of finishing the 10 yr annual on 9er-Pop-Hotel and had a nice cold day to do some performance runs. The old girl still scoots pretty well!

Same config since day one: ECI O-320, carb, Pmags, Hartzell. I am running 92 Mogas, LOP. 1750hrs. She has some scuffs and scratches now, but I am still thrilled!



Note - I used an old spreadsheet, so Points 5-7 are Points 1-3 for 2016.

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Amateur Plane - RV-9A N789PH - 2100+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
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  #28  
Old 01-07-2017, 03:34 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
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Default

Your numbers seem right in line with mine, Pete, maybe a knot or two faster. Given your MP and RPM, it looks like you're at about 64-65% power. What's remarkable though is you are doing 150 kts at 6gph. With my mags a similar power setting/TAS requires 7gph. I almost can't wait until my mags need the 500 hour overhaul. I'll probably just sell the cores and go with pmags.

In any case your longitudinal data is remarkably consistent. Good to have!
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  #29  
Old 01-13-2018, 01:36 PM
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petehowell petehowell is offline
 
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Location: MN
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Default Year 11 Performance Runs

Well, year 11 is here, and it is coooold, but clear, with little wind. Time see if the old gal can get up <check> and still go <double check>.

Like -18C cold!



I think "she has still got it" at about 1950 hours. MOGAS, LOP, Carb, Hartzell, Dual PMags, nutty meat servo........ Fuel flow was between 5.9 and 6.2 GPH throughout the runs.



Squares in the sky......Otto-pilot with Alt hold engaged



Your meat servo, with cap and ho-made electric vest for heat!



In the plane, the Vest plugs into 12V Outlet with PWM Temp Control - Powered by office surplus Laptop power brick at Home office - very toasty!



Cold, Clear and a Million. Takeoff was, um, "exciting" for a tired, old O-320. Tower laughed and and said "Wow! - You picked the right day to do that!" He was not wrong....... Pushing her in was not much fun, but worth it!!!



No engine maint other than oil changes and compression checks this year. All the cylinders were 76/80 or above at 1900hr check.
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Amateur Plane - RV-9A N789PH - 2100+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
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  #30  
Old 01-13-2018, 03:11 PM
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snopercod snopercod is offline
 
Join Date: Aug 2016
Location: Asheville, NC
Posts: 1,690
Default

I commend you for doing this on a regular basis. You can also fly a triangle pattern using the Ed Williams formulae. http://www.edwilliams.org/avform.htm#3gs
Quote:
TAS and windspeed from three (GPS) groundspeeds.

Determine your groundspeed on three headings that differ by 120 degrees (eg 40, 160 and 280 degrees), call these v1, v2 and v3

Let

vms = (v1^2 + v2^2 + v3^2)/3
a1= v1^2/vms -1
a2= v2^2/vms -1
a3= v3^2/vms -1
mu= (a1^2 + a2^2 + a3^2)/6

Let bp and bm be the roots of the quadratic b^2 -b + mu =0 ie:

bp= 1/2 +sqrt(1/4-mu)
bm= mu/bp

The TAS and windspeed are then given by sqrt(vms*bp) and sqrt(vms*bm) provided that the TAS exceeds the windspeed. If this is not the case, the roots are exchanged. This is a handy way to check your TAS (and the calibration of your airspeed indicator) using your GPS groundspeed, even though the wind is unknown.
I made a "Numbers" spreadsheet of this in my iPad.
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