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  #31  
Old 08-22-2011, 04:32 PM
azcloudflyer azcloudflyer is offline
 
Join Date: Feb 2008
Location: Apache Junction, Az
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Here is my data on power required with and without wheel fairings. Other data for drag is on my web page under flight testing.

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  #32  
Old 08-22-2011, 04:44 PM
azcloudflyer azcloudflyer is offline
 
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Location: Apache Junction, Az
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Here is a comparison of thrust required for level flight with and without wheel fairings. (The previous post was power required for level flight). The wheel fairing reduced minimum drag from 257 lbs to 231 lbs at best glide airspeed.

Without wheel and leg fairings



With wheel and leg fairings
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  #33  
Old 02-12-2012, 08:54 PM
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dmaib dmaib is offline
 
Join Date: Jan 2006
Location: New Smyrna Beach, FL
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Question

A year or two ago I remember seeing a post about someone that was making after market main gear wheel pants for the -10. Not sure if it was on this forum or somewhere else. Anybody know the status of that project?
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RV-10 N380DM
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  #34  
Old 02-12-2012, 08:58 PM
Sig600 Sig600 is offline
 
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Location: KRTS
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Very cool Mike, what did you use to gather that data?
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  #35  
Old 02-14-2012, 04:45 AM
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Nick Nick is offline
 
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Location: Rosharon, TX
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Quote:
Originally Posted by pierre smith View Post
Did you notice his funky air exit flap? Looks like an adjustable exit which he can close at speed for even less drag.

Notice the tape around all joints in the cowl, gear leg fairings and tail fairing.

He also has the fresh air vents closed and taped....no telling what under-hood mods he has too.

Mine will run 186 Knots down low, WOT with none of the above! The fit and finish and attention to detail by the guys in Big Fork, Montana, who built her, makes a big difference in beating Van's posted numbers for the -10.

Best,
Sorry I'm so late to the party guys, I just saw this thread.

A little history on this particular -10 and my race speed.


The funky air exits, they are just that. Cowl flaps. Fully functional, open for TO, closed for cruse. Been there since HR 0. No other under cowl mods (at that time.....) Race prep included all seams taped, steps removed, and vents sealed. I also turned the prop up to 2750 for the race. Verdict is still out on if the prop speed helped or not, Bob A has done more research on that one.

The speeds that I've seen Pierre post, I'd venture to say we are almost identical. One day I'd like to go toe to toe and find out.


Real life numbers, 177 knts @ 8500ft @14 GPH.


What I've learned about the 10 in nearly 200 hrs. She does not like to be down low. You "can" go fast low, but you are going to burn a LOT of gas. Go to at least 8000 ft and let her run.
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RV-10 Built 2010, Sold 2019
RV-8 SB, "Fuse in progress"

Last edited by Nick : 02-14-2012 at 05:22 AM. Reason: Spelling
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  #36  
Old 02-14-2012, 05:00 AM
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pierre smith pierre smith is offline
 
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
Default Like mine.

Hi Nick,
My numbers pretty well match yours at 7,500 or so. Funny thing...I went 178 K TAS last week, at 75% power but I had a 140 lb. PT-6 gearbox in the back seat, so I had an ideal CG with only me in the front.

FYI, last May I did Top-time-of the day, running 188K TAS at 1200', WOT and burning near 23 GPH! during the Race-to-Ridgeland...a 145 mile 4 waypoint cross-country.

I'll let you in on my discovery...2630 RPM was 3 knots faster than last year's speed. These numbers from my Dynon 100 and the time calculated by individual stop watches at the finish line.

Best of luck,
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Air Tractor AT 502B PT 6-15 Sold
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  #37  
Old 02-14-2012, 09:41 AM
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Mike S Mike S is offline
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Location: Dayton Airpark, NV A34
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Quote:
Originally Posted by Nick View Post
The funky air exits, they are just that. Cowl flaps. Fully functional, open for TO, closed for cruse.
Nick, any chance of more details on this, like photos, and how it affects CHT's etc??

Thanks in advance.
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VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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  #38  
Old 02-15-2012, 12:25 PM
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Nick Nick is offline
 
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Location: Rosharon, TX
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Quote:
Originally Posted by Mike S View Post
Nick, any chance of more details on this, like photos, and how it affects CHT's etc??

Thanks in advance.
Just for you Mike... New thread and everything.
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91TS Rosharon, TX
RV-4 Bought 2019
RV-10 Built 2010, Sold 2019
RV-8 SB, "Fuse in progress"
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  #39  
Old 02-15-2012, 12:34 PM
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Mike S Mike S is offline
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Thanks Nick, it is appreciated.
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VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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  #40  
Old 02-15-2012, 02:55 PM
Allan Bartlett Allan Bartlett is offline
 
Join Date: Feb 2012
Location: Irvine,CA
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I love that old video.
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