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03-21-2011, 10:52 AM
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Join Date: Mar 2010
Location: BRAZIL
Posts: 138
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Hi folks,
As promissed finally let me update this post with my results/tests after this first sunny weekend here...
I tried WOP (wide open throtle - full throtle) , full rich, 2650rpm (Hartzell) in my RV9A with Lyc 160hp and the max I got was 159mph IAS (that gave me 186mph TAS). EFIS was reading 91% power (think it would never got to 100% though cause I was already full throtle...)
That was maximum speed I got level flight (8000ft DA).
Thanks all for the comments and tips, regards;
Alexandre "neck" Marton
__________________
Alexandre "neck" Marton
Brazil
RV7A (8/2015 built by FLYER)
Lycoming 180 HP - YIO-360-M1B, Hartzell C2YR-1BFP/F7497? 72??, Garmin panel - G3X Touch, GTN650, GTS800, WX-500, BATT CONCORDE RG-25XC AEROBATIC SEALED.
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Others: RV9A
Lycoming XIO320-D1A, Hartzell HC-C2YL-1BF/F7663-4 , CS GOVERNOR MTV-12-B, DYNON D180
AND GARMIN AVIONICS
(Sold with aprox 300hrs flown from Dec/2010 -- JUN/2014)
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03-21-2011, 11:17 AM
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Join Date: Mar 2005
Posts: 5,685
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That is going to be very tough I suspect
There are a lot of things you can do to reduce drag beyond the stock completed airplane with all of its fairings. In my RV-6A the initial tested three direction maximum baseline speed at 6000 ft density altitude was 170.67 kts. I have tried a lot of things and reported them in this forum. Many did no good or even reduced the speed. The top speed I have been able to achieve is now 184.4 kts.
Bob Axsom
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03-21-2011, 12:52 PM
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Join Date: May 2005
Location: Canby, Oregon
Posts: 1,786
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Neck, you plane is looking good.
Quote:
Originally Posted by ALMARTON
Hi folks,
I tried WOP (wide open throtle - full throtle) , full rich, 2650rpm (Hartzell) in my RV9A with Lyc 160hp and the max I got was 159mph IAS (that gave me 186mph TAS). EFIS was reading 91% power (think it would never got to 100% though cause I was already full throtle...)
That was maximum speed I got level flight (8000ft DA).
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The EFIS power table should be adjusted. With those setting the power indictation is to high. I don't know the correct formula, but I would think something around 75 - 80 percent power.
Kent
__________________
Kent Byerley
RV9A N94KJ - IO320, CS, tipup
AFS 3500, TT AP, FLYING....
Canby, Or
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03-21-2011, 02:02 PM
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Join Date: Jan 2005
Location: Near Scipio, in Southern Indiana
Posts: 1,779
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On my 9A, I went from 188 to 192 WOT when I put on the second P-Mag. The first one cut my fuel burn, but didn't increase the performance noticeably. When I added the second one, it didn't cut the fuel burn much , but added about 4 mph top. This was with a waxed plane, and I can see a difference, although I haven't done any serious measurement.
Bob Kelly
__________________
Bob Kelly, Scipio, Indiana
Tech Counselor
Founder, Eagle's Nest Projects
President, AviationNation, Inc
RV-9A N908BL, Flying
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03-21-2011, 04:49 PM
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Join Date: Jan 2005
Location: Twin Cities, MN
Posts: 1,565
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Quote:
Originally Posted by ALMARTON
Hi folks,
As promissed finally let me update this post with my results/tests after this first sunny weekend here...
I tried WOP (wide open throtle - full throtle) , full rich, 2650rpm (Hartzell) in my RV9A with Lyc 160hp and the max I got was 159mph IAS (that gave me 186mph TAS). EFIS was reading 91% power (think it would never got to 100% though cause I was already full throtle...)
That was maximum speed I got level flight (8000ft DA).
Thanks all for the comments and tips, regards;
Alexandre "neck" Marton
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Full rich @ 8000ft DA will cost you some power; leaning for "best power"/slightly rich-of-peak will get it back for you if your engine is broken in and otherwise able to run there.
__________________
Brad Benson, Maplewood MN.
RV-6A N164BL, Flying since Nov 2012!
If you're not making mistakes, you're probably not making anything
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03-22-2011, 01:53 AM
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Join Date: Sep 2010
Location: Sao Paulo, Brasil
Posts: 72
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Wasting Fuel
Quote:
Originally Posted by ChiefPilot
Full rich @ 8000ft DA will cost you some power; leaning for "best power"/slightly rich-of-peak will get it back for you if your engine is broken in and otherwise able to run there.
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Plus = Full Rich - WOT at 8000 feet will certainly waste a lot of unburned fuel and leave you a black smoked belly and maybe some fouled plugs 
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