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01-19-2016, 04:34 AM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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awesome. both the sound and the look!
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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01-19-2016, 04:37 AM
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Join Date: Jan 2005
Location: Cartersville, Georgia KVPC
Posts: 945
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Quote:
Originally Posted by DanH
Precisely.... love the sound.
Brian, considering just firewall forward, do you know how much additional frontal area you actually have?
The frontal area of a stock RV8 might be considered the firewall area plus that part of the coal shovel cowl exit which extends below the belly skin line. The Rotec is only 33.5" diameter, so I'm guessing the cowl is not wider than stock.
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Dan,
Some quick and dirty calculations based on the CAD drawings Van's has available on their website:
Frontal area of the RV8 as you described: 6.87 square feet...assuming the Van's CAD drawings are accurate.
Frontal area of the radial cowl, assuming 38" diameter at it's widest (that's only 2" clear all around): 8.48 square feet....a 23% increase over the 8.
If we can shoe-horn the radial into a super-tight fitting cowl...say 36" diameter (1" clear all around), that's 7.07 square feet....or only a 3% increase.
Brian,
Not picking on you or your airplane...just an academic exercise with Dr. Dan, because he has that affect on me (he makes me think!)... 
Congratulations on a job well done! Your airplane is gorgeous, and giving me a bad case of the wants.
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Moose
VAF #136
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01-19-2016, 04:45 AM
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Join Date: Jun 2006
Location: Port Orange, FL (7FL6)
Posts: 274
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Quote:
Originally Posted by DanH
Precisely.... love the sound.
Brian, considering just firewall forward, do you know how much additional frontal area you actually have?
The frontal area of a stock RV8 might be considered the firewall area plus that part of the coal shovel cowl exit which extends below the belly skin line. The Rotec is only 33.5" diameter, so I'm guessing the cowl is not wider than stock.
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The firewall is stock between the longerons. All I did was raise and lower it a little bit. I got the original idea to do the conversion because the diameter of the engine was very close to the width of a lycoming. To I was able to use the stock Vans hard points and didnt need to re engineer the airframe. So other than the opening for engine cooling, the flat plate drag isn't to much higher. In the future when I install an efis and can got more data on engine cooling, I may install a larger spinner and close down the gap a bit to gain some additional speed.
[IMG]  [/IMG]
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Flying as of 1-12-2016!!!!!
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01-19-2016, 04:47 AM
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Join Date: Jun 2006
Location: Port Orange, FL (7FL6)
Posts: 274
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Quote:
Originally Posted by Michael White
Dan,
Some quick and dirty calculations based on the CAD drawings Van's has available on their website:
Frontal area of the RV8 as you described: 6.87 square feet...assuming the Van's CAD drawings are accurate.
Frontal area of the radial cowl, assuming 38" diameter at it's widest (that's only 2" clear all around): 8.48 square feet....a 23% increase over the 8.
If we can shoe-horn the radial into a super-tight fitting cowl...say 36" diameter (1" clear all around), that's 7.07 square feet....or only a 3% increase.
Brian,
Not picking on you or your airplane...just an academic exercise with Dr. Dan, because he has that affect on me (he makes me think!)... 
Congratulations on a job well done! Your airplane is gorgeous, and giving me a bad case of the wants.
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Your second diameter would be the correct one. There is about a one inch gap between the engine and cowling all around. Thanks!
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Flying as of 1-12-2016!!!!!
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01-19-2016, 04:48 AM
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Join Date: Apr 2015
Location: Vienna, VA
Posts: 61
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Love the look and the sound! Well done Sir!!!
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-Bob "Beagle" Brents
RV-8 (Reserved: N808B sorta like " BOBB")
(Empennage: 95%)
(Wings: 60%)
?To invent an airplane is nothing. To build one is something. To fly is everything.? - Otto Lilienthal
https://www.facebook.com/fliegen.beagle
Dues Happily Paid 2019
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01-19-2016, 05:25 AM
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Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
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Yep
[quote=flyboykelly;1046629], I may install a larger spinner and close down the gap a bit to gain some additional speed.
Exactly what Darryl Greenamyer did with his Bearcat. He also filled in the rounded intake lip inside the cowl to reduce turbulence there and has a really small gap between the spinner and the cowl intake...lots of drag reduction possible there.
Beautiful RV you have,
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Pierre Smith
RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15 Sold
Air Tractor 402 PT-6-20 Sold
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga
It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132
Dues gladly paid!
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01-19-2016, 05:59 AM
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Join Date: Aug 2011
Location: Keller, TX
Posts: 408
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I love your unique RV-8R! It looks and sounds like no other RV out there!
I looked at the 1st flight video you posted on Facebook and could not read clearly the ASI. However, it looks like you are reporting IAS, not TAS. Is that correct? Anyway, speed is secondary when you have a great looking and sounding airplane like that.
Can't wait to see and hear it in person some time!
TJ
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RV-10 N331JH 3rd owner (First flew in 2005, #15 flying)
Northwest Regional 52F
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01-19-2016, 06:23 AM
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Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,326
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The only person who will feel the speed difference is you. But on the ground? Man, you will need to put up an electrified cattle fence around that thing at Oshkosh to keep all the drool off of it. Mucho cool!
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Randy Pflanzer
Greenwood, IN
www.pflanzer-aviation.com
Paid through 2043!
Lund fishing Boat, 2017, GONE FISHING
RV-12 - Completed 2014, Sold
427 Shelby Cobra - Completed 2012, Sold
F1 EVO - partially completed, Sold
F1 Rocket - Completed 2005, Sold
RV-7A - Partially completed, Sold
RV-6 - Completed 2000, Sold
Long-EZ - Completed 1987, Sold
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01-19-2016, 06:30 AM
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Join Date: Aug 2012
Location: Garden City Texas
Posts: 878
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I hope I get a close look at it at Oskosh! Great looking machine!
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01-19-2016, 06:38 AM
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Join Date: Jun 2006
Location: Port Orange, FL (7FL6)
Posts: 274
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Quote:
Originally Posted by Flying again!
I love your unique RV-8R! It looks and sounds like no other RV out there!
I looked at the 1st flight video you posted on Facebook and could not read clearly the ASI. However, it looks like you are reporting IAS, not TAS. Is that correct? Anyway, speed is secondary when you have a great looking and sounding airplane like that.
Can't wait to see and hear it in person some time!
TJ
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All of the speeds are IAS @1000 agl.
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Flying as of 1-12-2016!!!!!
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