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  #1  
Old 03-11-2017, 12:28 PM
Robert M's Avatar
Robert M Robert M is offline
 
Join Date: Feb 2006
Location: South Carolina
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Default Speeds related to engine & prop combo

Once it gets airborne, I will flying behind a Lycoming O-320 with a 67x69, Catto, 3 blade prop.

Does anyone have any comparable data about what kind of speeds I might expect to see with my RV-9?

Thanks
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  #2  
Old 03-11-2017, 03:07 PM
Rupester Rupester is offline
 
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MANY answers to this ... what RPM and altitude? ... ROP or LOP?
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Old 03-11-2017, 03:47 PM
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JohnInReno JohnInReno is offline
 
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Location: Prescott Valley/Chandler AZ
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Default Experience

Plan on:

LOP - 150kts @ 7gal/hr
ROP - 160kts @ 9.5gal/hr
  1. You will have headwinds more often than not.
  2. Higher is better.
  3. You will need to stop before the airplane does.

A lot depends on how you manage your engine.
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Old 03-11-2017, 03:54 PM
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scottmillhouse scottmillhouse is offline
 
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I found by my 7 years with my RV-9A that I got exactly the speed and performance as Vans advertised for a 160HP constant speed. It is all about horsepower overcoming drag.
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  #5  
Old 03-13-2017, 05:58 AM
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Robert M Robert M is offline
 
Join Date: Feb 2006
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Default RE: Speeds related to engine & prop combo

Quote:
Originally Posted by Rupester View Post
MANY answers to this ... what RPM and altitude? ... ROP or LOP?
Yes, I understand, and you hit the nail on the head, that is exactly the information I am looking for. Not one specific set of data points but a range of data from several different settings. What kind of (average) speeds were seen at what altitudes with what mixture settings?

The reason for me asking is that Van's doesn't have any hard data for the 150HP engine. So I used the differences between the 118HP and the 160HP engines to come up with a formula to try and predict some estimates of my own. Just checking to see how close I actually got.

Catto told me the prop I have will provide me with a "little" more cruise than climb.

I don't know whether I will run LOP or ROP. Everything I did in training and all flights after was done in Cessnas and all were done at ROP. I believe I was ROP. At altitude, lean until RPM's drop a tad, then back a little rich to go back to RPM.

Please understand I'm not looking for "You WILL see these speeds." I'm just trying to get a ballpark guesstimate. I know every single RV-9 that is built, is different. Options, build technique, weight (etc.) all affect what the plane will do in the real world. I'm just wanting to see how close my formulas are to what the real world says.

Thanks again,
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RV-9, N556RM, O-320, Dual PMags, Catto 3 blade.
100% finished - flight ready - waiting for inspection.
Mosquito XEL kit in hangar waiting on RV-9 to fly.
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  #6  
Old 03-13-2017, 06:57 AM
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Jesse Jesse is offline
 
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Location: X35 - Ocala, FL
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In our RV-9A we used to fly at 10-12,000'. Usually saw 145-150ktas at 2400rpm, burning 6.2gph leaned out on a 150HP carburated engine with a Sensenich GA prop. Manifold pressure was wide open.
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