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  #1  
Old 08-09-2020, 10:01 AM
Earl Findlay Earl Findlay is offline
 
Join Date: Jul 2019
Location: Sandpoint, Idaho
Posts: 85
Default 9A too slow. Frustrated

My IO-360 RV-9A will not go faster than 148 knots at 2600 RPM. Fixed pitch prop. I’m frustrated constantly hearing others saying they’re 160 or 165 knots. What can I check on my airplane to hopefully fix and make it go faster?
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  #2  
Old 08-09-2020, 10:01 AM
Kyle Boatright Kyle Boatright is online now
 
Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,428
Default

Is that an indicated airspeed, or true airspeed? It makes a huge difference with altitude.
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Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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  #3  
Old 08-09-2020, 10:05 AM
Earl Findlay Earl Findlay is offline
 
Join Date: Jul 2019
Location: Sandpoint, Idaho
Posts: 85
Default

True airspeed in knots.
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  #4  
Old 08-09-2020, 10:06 AM
BH1166 BH1166 is online now
 
Join Date: Nov 2017
Location: Eatonton Georgia
Posts: 374
Default Prop pitch...

Cruise or climb pitch in the comparison?
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Butch
RV6A Purchased N72TX
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  #5  
Old 08-09-2020, 10:25 AM
Earl Findlay Earl Findlay is offline
 
Join Date: Jul 2019
Location: Sandpoint, Idaho
Posts: 85
Default

Quote:
Originally Posted by plehrke View Post
Don’t bite on this thread. Same guy said 3 months ago he went 234 kts TAS in his 9.
https://vansairforce.net/community/s...d.php?t=182922
Right. That was in a descent and before I realized that our Vne is a TAS not IAS.

Remember, when people questioned whether I was “real” (I still don’t know how a fake person can write on a web bulletin board) two people came out to the airport to meet up with me and see my RV-14 build. How much more real does it get?

Your message was not helpful, and I do not appreciate you distracting from the assistance that I am seeking.
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  #6  
Old 08-09-2020, 10:26 AM
Earl Findlay Earl Findlay is offline
 
Join Date: Jul 2019
Location: Sandpoint, Idaho
Posts: 85
Default

Quote:
Originally Posted by BH1166 View Post
Cruise or climb pitch in the comparison?
Gee, I really am not sure. I believe the prop is set for climb pitch.
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  #7  
Old 08-09-2020, 10:31 AM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,397
Default Prop pitch

Well, if it's pitched for climb, then your cruise will be slower.

If it's pitched for cruise, your climb rate will be less.

You can have it one way or the other; not both. The best you can do with a FP prop, is a compromise...
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Aerospace Engineer '88

RV-10
Phase I COMPLETE!

Dues+ Paid 2020,...Thanks DR+
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  #8  
Old 08-09-2020, 10:40 AM
Earl Findlay Earl Findlay is offline
 
Join Date: Jul 2019
Location: Sandpoint, Idaho
Posts: 85
Default

Quote:
Originally Posted by rocketman1988 View Post
Well, if it's pitched for climb, then your cruise will be slower.

If it's pitched for cruise, your climb rate will be less.

You can have it one way or the other; not both. The best you can do with a FP prop, is a compromise...
I can still make 2700 RPM at altitude though.

Is a 10-12 knot speed penalty usual for a climb prop versus a cruise prop? It sounds excessive, but I really don’t have any information to base that on.
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  #9  
Old 08-09-2020, 10:47 AM
pilotkms's Avatar
pilotkms pilotkms is offline
 
Join Date: Mar 2007
Location: WARNER ROBINS, GA
Posts: 464
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two people came out to the airport to meet up with me and see my RV-14 build. How much more real does it get?

Yea - still waiting for them to post confirming you’re real.
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Keith
RV 7A RV #9700 May 2017
N325KS the Flying “K”
Built in SoCal KCCB, now in GA @ KPXE
600+ Hours & 7X cross the USA
OSH flyin 2018 & 2019 & Petit Jean 2019
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  #10  
Old 08-09-2020, 11:01 AM
Flying Canuck Flying Canuck is offline
 
Join Date: Jan 2015
Location: Red Deer, Alberta, Canada
Posts: 502
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I wish I could get 148 KT TAS out of my 9A (IO-320 C/S). Rest assured you don't have the slowest -9A out there. I max out at about 142 KT at 70% power with all of my fairings installed. Not a chance I can get near Van's published 162 KT at 75%.

My advice, don't worry about the speed. Whatever it is, it is much faster than a 172 and a lot more fun too.
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Claude Pitre
RV-9A #91081, C-GCPT
Dynon SkyView HDX, IO-320 and WW 200RV C/S. Flying as of August 6, 2018

Added GPS 175 and authorized for IFR April 1, 2021

Interactive map of all of my flights here
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