VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Main > RV General Discussion/News
Register FAQ Members List Calendar Today's Posts

Reply
 
Thread Tools Search this Thread Display Modes
  #21  
Old 01-19-2016, 04:34 AM
Steve Melton's Avatar
Steve Melton Steve Melton is offline
 
Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
Default

awesome. both the sound and the look!
__________________
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
Reply With Quote
  #22  
Old 01-19-2016, 04:37 AM
Michael White's Avatar
Michael White Michael White is offline
 
Join Date: Jan 2005
Location: Cartersville, Georgia KVPC
Posts: 945
Default

Quote:
Originally Posted by DanH View Post
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.
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.
__________________
Moose
VAF #136
Reply With Quote
  #23  
Old 01-19-2016, 04:45 AM
flyboykelly's Avatar
flyboykelly flyboykelly is offline
 
Join Date: Jun 2006
Location: Port Orange, FL (7FL6)
Posts: 274
Default

Quote:
Originally Posted by DanH View Post
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.
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]
__________________
Flying as of 1-12-2016!!!!!
Reply With Quote
  #24  
Old 01-19-2016, 04:47 AM
flyboykelly's Avatar
flyboykelly flyboykelly is offline
 
Join Date: Jun 2006
Location: Port Orange, FL (7FL6)
Posts: 274
Default

Quote:
Originally Posted by Michael White View Post
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.
Your second diameter would be the correct one. There is about a one inch gap between the engine and cowling all around. Thanks!
__________________
Flying as of 1-12-2016!!!!!
Reply With Quote
  #25  
Old 01-19-2016, 04:48 AM
Beagle's Avatar
Beagle Beagle is offline
 
Join Date: Apr 2015
Location: Vienna, VA
Posts: 61
Default

Love the look and the sound! Well done Sir!!!
__________________
-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
Reply With Quote
  #26  
Old 01-19-2016, 05:25 AM
pierre smith's Avatar
pierre smith pierre smith is offline
 
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
Default 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,
__________________
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!
Reply With Quote
  #27  
Old 01-19-2016, 05:59 AM
Flying again!'s Avatar
Flying again! Flying again! is offline
 
Join Date: Aug 2011
Location: Keller, TX
Posts: 408
Default

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
__________________
RV-10 N331JH 3rd owner (First flew in 2005, #15 flying)
Northwest Regional 52F
Reply With Quote
  #28  
Old 01-19-2016, 06:23 AM
f1rocket's Avatar
f1rocket f1rocket is offline
 
Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,326
Default

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!
__________________
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

Reply With Quote
  #29  
Old 01-19-2016, 06:30 AM
MikeyDale's Avatar
MikeyDale MikeyDale is offline
 
Join Date: Aug 2012
Location: Garden City Texas
Posts: 878
Default

I hope I get a close look at it at Oskosh! Great looking machine!
__________________
Mike Hillger
RV 7 FLYING SINCE 4/2015!
Garden City, Texas
First Flight https://www.youtube.com/watch?v=QqgxhWH3pqA
Dues Paid
Reply With Quote
  #30  
Old 01-19-2016, 06:38 AM
flyboykelly's Avatar
flyboykelly flyboykelly is offline
 
Join Date: Jun 2006
Location: Port Orange, FL (7FL6)
Posts: 274
Default

Quote:
Originally Posted by Flying again! View Post
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
All of the speeds are IAS @1000 agl.
__________________
Flying as of 1-12-2016!!!!!
Reply With Quote
Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 01:04 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.