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  #1  
Old 09-19-2022, 10:27 AM
Bsquared's Avatar
Bsquared Bsquared is offline
 
Join Date: Mar 2018
Location: Southern California
Posts: 183
Default Performance benchmarking

I have about 140 hrs on my 14A with the 210 hp 390. I tried a number of power and mixture settings and have settled in with what is shown on this pic from a recent x-country flight. 2400 rpm, WOT and 60 LOP at 9800 ft density altitude results in 165 kts TAS and 8.8 GPH. I can get the FF down to 8.2 GPH by reducing the power down to the 52% range but the drop in TAS doesn’t seem to make it worthwhile. For other operators of the 210 hp engine is this what you see from your airplane?
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Last edited by Bsquared : 09-19-2022 at 10:36 AM.
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  #2  
Old 09-20-2022, 12:07 AM
Navy76 Navy76 is offline
 
Join Date: Apr 2018
Location: Corvallis, OR
Posts: 47
Default Similar Results

Today I tried to match your parameters and the results are nearly identical to yours. I have 155 hours on my RV-14A as of today's flight. I flew at 8500ft with WOT and 8.8 gal/hr FF. My density altitude was a little less than yours because my OAT was 5 degrees cooler but, otherwise, the results appear to be very similar.

EDIT: I did the calc and, actually, our density altitudes were within a few feet of each other. It's pretty amazing to me how close our performance numbers are. BTW, my engine is also the 210 HP IO-390. Mine is a Thunderbolt, but that doesn't appear to matter!
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Last edited by Navy76 : 09-20-2022 at 12:37 AM.
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  #3  
Old 09-20-2022, 04:38 AM
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Jetmart Jetmart is offline
 
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Location: Windsor, Ontario
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Default

95 hrs on a RV-14 taildragger with a 390 Thunderbolt.
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Glenn Martin
Windsor, Ontario
1941 Tiger Moth
2017 Waco YMF-5
RV-14 Kit # 140694 - First Flight June 22, 2021
RV-14 A - Kit Ordered February 8, 2022
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  #4  
Old 09-20-2022, 06:39 AM
RV6-KPTW RV6-KPTW is offline
 
Join Date: Oct 2014
Location: Sebastian Fl X26
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Default

167 true for the same 2400 WOT LOP profile. Further, I note that my CHTs are similar to the posters. #2 cylinder is hottest by 20 degrees or so, and 3 and 4 are the coolest. Weird.

Warning: Thread drift…. BTW, #2 had morning sickness fixed by reaming and cleaning out black gunk out of the valve guide and off the stem. Temperature issue?

Search for “Sticky Valve” in this subforum for more info.
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Last edited by RV6-KPTW : 09-20-2022 at 06:44 AM.
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  #5  
Old 09-20-2022, 09:55 PM
cbennet1 cbennet1 is online now
 
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Location: Newbury Park, CA
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Default Ignition type?

Are you folks all running dual E-Mags?

Craig
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  #6  
Old 09-20-2022, 11:19 PM
Navy76 Navy76 is offline
 
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Quote:
Originally Posted by cbennet1 View Post
Are you folks all running dual E-Mags?

Craig
Speaking for myself, yes, using the stock, standard advance settings.
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  #7  
Old 09-21-2022, 04:11 AM
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Jetmart Jetmart is offline
 
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I am running one emag & one conventional. Emag is stock set up timed at 4 degrees past TDC.
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Glenn Martin
Windsor, Ontario
1941 Tiger Moth
2017 Waco YMF-5
RV-14 Kit # 140694 - First Flight June 22, 2021
RV-14 A - Kit Ordered February 8, 2022
2022 Dues Paid
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  #8  
Old 09-21-2022, 06:31 AM
RV6-KPTW RV6-KPTW is offline
 
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I am also running one emag & one conventional. Emag is set to A curve and timed at 6ish degrees past TDC.
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- RV14 sn:140193 - Awesome airplane!
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  #9  
Old 09-21-2022, 07:29 AM
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Bsquared Bsquared is offline
 
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One Emag and one conventional as well for me (original Poster). Emag using the A curve and timed to 5 deg ATDC.
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Last edited by Bsquared : 09-21-2022 at 03:21 PM.
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  #10  
Old 09-21-2022, 07:21 PM
JHartline JHartline is offline
 
Join Date: Dec 2012
Location: Carrollton, GA 5GA2
Posts: 300
Default Cross country numbers

Additional data points. Mine is a tail dragger, T-bolt IO-390 with dual P-Mags timed at 5-deg PTDC (A-curve). About 30-50 LOP and WOT. Density altitudes 8,461, 10,581, and 11,508 density altitudes respectively.

Headwind was crushing me on the first two. Next day…mostly crosswind. Life’s not fair!!

(Disregard my aileron trim - the gauge really exaggerates the trim amount. My plane is straight…I swear.)

Seems like I’m in the general ballpark with others.
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