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  #21  
Old 08-19-2011, 07:45 PM
aerhed aerhed is offline
 
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Location: Big Sandy, WY
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Quote:
RV-10 Nafsinger, Nick 191.47
If I could get mine to a hunnerd&ninety knots I'd be up for more than a sandwich for sure.
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  #22  
Old 08-19-2011, 08:18 PM
Bob Axsom Bob Axsom is offline
 
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Posts: 5,685
Default And that wasn't a straight line speed

That was on an over 100 mile course with seven legs and seven sharp turns. Most were around 90 degrees and two nearer 180 degrees. One turn of more than 90 degrees was at the start line - hence equal number of legs and turns. It was an impressive performance.

Bob Axsom

Last edited by Bob Axsom : 08-20-2011 at 01:07 AM. Reason: Clarify
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  #23  
Old 08-20-2011, 05:28 AM
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pierre smith pierre smith is offline
 
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Location: Louisville, Ga
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Default Yeah but...

Quote:
Originally Posted by aerhed View Post
If I could get mine to a hunnerd&ninety knots I'd be up for more than a sandwich for sure.
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,
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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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  #24  
Old 08-20-2011, 06:54 AM
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RV10inOz RV10inOz is offline
 
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Location: Brisbane Qld. Aust.
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Pierre

How is it you get that and what is your instrument error............not that I am racing you................ but I am keen to know your secret for altitude, fuel flow (leaned for best power etc.

I have seen 181 knots at 1000' straight and level....maybe I need some speed mods
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  #25  
Old 08-20-2011, 09:31 AM
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David Shelton David Shelton is offline
 
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Location: Belvidere, IL
Posts: 169
Default Reflex

I know that flaps have been reflexed successfully on many different aircraft. However, it is important to make sure the stall/spin characteristics are not harmed. The stock wing is designed to begin stalling at the wing root and reflexing the flaps too much can result in tip stalls. Make sure you evaluate this part of the flight envelope.
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  #26  
Old 08-20-2011, 01:18 PM
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pierre smith pierre smith is offline
 
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Default A coupla things

Quote:
Originally Posted by RV10inOz View Post
Pierre

How is it you get that and what is your instrument error............not that I am racing you................ but I am keen to know your secret for altitude, fuel flow (leaned for best power etc.

I have seen 181 knots at 1000' straight and level....maybe I need some speed mods
Hi Oz,
One secret is to run the revs back a little from 2700 (Suggested by Alan Barret of Barret Precision Engine fame)...I picked up 3 MPH doing that while watching the Dynon 100 read my TAS. I also have the Hartzell blended airfoil prop...supposedly the fastest of props for the -10. I was solo with the back seats and cushions out and nothing in the baggage area. I also leaned a little, watching CHT's and EGT's carefully but still burning over 20 GPH.

I don't believe that I have much, if any airspeed error since both the Garmin 496 and 430 W agree with the D-100 on a calm day....plus, I set top-time-of-day for two years running in the Race to Ridgeland (South Carolina), beating a Corvette-powered -10 and a -6 and -7 as I recall, and this year also did the cross-country portion just a tad quicker than a retractable IO-360 Lancair...by 45 seconds according to the timers

The airplane was washed and chamois dried, not waxed..no bugs anywhere on the wings.

Best,
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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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  #27  
Old 08-20-2011, 04:35 PM
aerhed aerhed is offline
 
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Location: Big Sandy, WY
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[quote] I also leaned a little, watching CHT's and EGT's carefully but still burning over 20 GPH. [quote]
Ah Ha! I can't shovel in that much energy at this altitude. Plus I really only got about 3 hours with the fairings before I took them back off (sage stumps). I saw the tape, but I missed the cowl flap thingy.
Any new word on Larry's exit fairing? Curious minds want to know.
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  #28  
Old 08-20-2011, 04:39 PM
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RV10inOz RV10inOz is offline
 
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Location: Brisbane Qld. Aust.
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Nothing like twice the fuel flow for another 20 knots!

Did I say twice the fuel flow..

I wonder what the optimum RPM is for climb with the Hartzel, I always climb at full rpmwhich displays as 2670-2680, but as you have noted the slight reduction seems to get less blade drag losses. Maybe 2600 is the sweet spot?

What do you think?

Cheers

David
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  #29  
Old 08-20-2011, 10:56 PM
johnny stick johnny stick is offline
 
Join Date: Dec 2008
Location: Los Angeles, CA
Posts: 301
Default Science project

I'd be interested if someone would spread dirty oil on the plane and take in flight pictures. I am curious if there are any seperation bubbles on the wings or tail outboard of the prop wash. Seems to me there should be some boundary layer trip strips on the lower side of the wing outboard of the prop wash.
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  #30  
Old 08-21-2011, 04:23 PM
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pierre smith pierre smith is offline
 
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Location: Louisville, Ga
Posts: 7,840
Default You're in Oz but I'm here

Quote:
Originally Posted by RV10inOz View Post
. Maybe 2600 is the sweet spot?

What do you think?

Cheers

David
I'm not gonna divulge my revs during the race but it was a bit over 2600. You just have to go experiment...and it's sooo fun outrunning Bonanzas and 210's with fixed gear!

Best,
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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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