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11-24-2015, 06:57 PM
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Join Date: Nov 2015
Location: Ridgewood nj
Posts: 19
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Different speeds different models
I tried to search this but couldn't find a thread.
It there's one already please link it.
Vans posts estimated speeds on their site for the different models.
I have searched many different tail numbers in FlightAware and although it's not an accurate way to see how fast a plane is, it does show how fast people are flying in the system.
What model do you fly,which engine choice, what's your cruze speed and finally how fast can you go?
Paul
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11-24-2015, 10:03 PM
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Join Date: Jan 2015
Location: KC, MO
Posts: 374
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...
I have:
RV-4
Sensenich metal 2B prop
160 hp
Carbureted
ZFW 1028
Climb summer MATOW from 1000msl 1500-1700 fpm
-cruise 160-165 Kias
Climb winter MATOW from 1000msl 1700-2100 fpm
-cruise 165-170 kias
__________________
RV-4 - 0-320 (160HP)
www.KCFlight.org
Tinker
ATP/CFI/II/MEI
N617TN
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11-25-2015, 06:00 AM
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Join Date: Sep 2006
Location: Defiance, MO
Posts: 1,674
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Very loaded Question which will get a wide variety of responses
Quote:
Originally Posted by Bugsiegel
Vans posts estimated speeds on their site for the different models.
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Vans published speeds on his website are not estimates. They are based on flight test data.
Quote:
Originally Posted by Bugsiegel
I have searched many different tail numbers in FlightAware and although it's not an accurate way to see how fast a plane is, it does show how fast people are flying in the system.
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FlightAware are ground speeds so very inaccurate to determine how fast someone is flying without knowing the wind speed/direction.
__________________
Philip
RV-6A - 14+ years, 950+ hours
Based at 1H0 (Creve Coeur)
Paid dues yearly since 2007
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11-25-2015, 08:02 AM
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Join Date: Jul 2007
Location: Cypress, TX
Posts: 526
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Not sure why speeds would vary from summer to winter. I understand climb performance varies with temperature. But my fixed pitch speeds are constant relative to RPM.
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11-25-2015, 08:05 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by plehrke
Vans published speeds on his website are not estimates. They are based on flight test data...
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Very true! Plus the prop used can greatly impact cruise speed.
In my case I have an RV-9 tail dragger w/ an O-360 and fixed pitch Catto prop and typically cruise at between 55 and 65% power and see 150 to 160 knots. At 8,000 density altitude and all in (~75% power) it will true out at 174 kts but I never cruise it there.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
Last edited by N941WR : 11-25-2015 at 08:16 AM.
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11-25-2015, 09:01 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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200 HP RV-8 Hartzel Blended Airfoil:
165 KTAS @ 8.5 to 7.5 (between 7,500 and 10,500). wot, 2300 RPM, LOP
178 KTAS @12.5 GPH (max cruise)
260 Rocket Hartzel paddle blade:
195 KTAS @ 11.5 to 10 (7.5 and 10.5). WOT, 2300 RPM, LOP
224 KTAS @ 20+ GPH (max cruise)
Both airplanes are pretty "dirty" examples. Some aero cleanup should shift the speed up a little at the same fuel burn.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
Last edited by Toobuilder : 11-25-2015 at 09:03 AM.
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11-25-2015, 10:26 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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Quote:
Originally Posted by brad walton
Not sure why speeds would vary from summer to winter. I understand climb performance varies with temperature. But my fixed pitch speeds are constant relative to RPM.
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They shouldn't be. The prop thrust is tied to air density. For the same reason that your prop thrust is low at 10,000 DA is the same reason that it is high at -1000 DA. The prop is pushing air. The denser the air is, the greater the ultimate thrust produced by moving that air. Cold air is denser than warm air
Larry
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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11-25-2015, 11:10 AM
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Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
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My -10 is pretty consistent
At 7,500' and 75% power, my -10 consistently runs 204MPH solo and 200 MPH with 4 adults. I happen to have a two-bladed Hartzell blended airfoil prop...tested as the fastest prop for a -10. Aerosport IO-540 260HP.
Best,
__________________
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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11-25-2015, 12:23 PM
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Join Date: Jul 2007
Location: Cypress, TX
Posts: 526
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They shouldn't be. The prop thrust is tied to air density. For the same reason that your prop thrust is low at 10,000 DA is the same reason that it is high at -1000 DA. The prop is pushing air. The denser the air is, the greater the ultimate thrust produced by moving that air. Cold air is denser than warm air
Larry
I'm just reporting facts. Same true airspeed at same RPM's regardless of altitude. Could it be that there is also less drag in thinner air proportional to reduced thrust?
To get back to OP's original question, I usually cruise at 162 ktas at 2450 rpm's and 8 gph rich of peak at 8000 density altitude. At 2700 rpm's I get 178 ktas, gph varies greatly depending on altitude
Rv8 with Superior IO 360 and and Catto 3 blade
Last edited by brad walton : 11-25-2015 at 12:30 PM.
Reason: Model
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11-25-2015, 12:38 PM
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Join Date: Nov 2015
Location: Ridgewood nj
Posts: 19
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Pier smith
What is your fuel consumption at those speeds/settings with that engine?
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