VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #41  
Old 06-20-2022, 08:43 PM
Teal Teal is offline
 
Join Date: Jun 2022
Location: buckeye
Posts: 20
Default

Quote:
Originally Posted by scsmith View Post
What is the displacement of the Yamaha?

The speed reduction gears at the links that DanH posted seem to have large reduction ratios, suggesting the engine is turning at very high RPM.
What is the expected lifespan/TBO of this engine?

The light weight, and especially the performance at altitude are very appealing, but it must be a screaming mimi in there!

Electric C/S prop I presume? How do you like it?
Displacement is 1000cc or about 60cu in.
Currently running 2.85:reduction
Cruise RPM's is 6000-6500 rpm.
Some would call this screaming compared to the much larger displacement direct drive aircraft engines. But at 6500 the piston speeds are slower that a 0-320 running at 2500.

I have no idea at this time of TBO. I used 500 hours as a number that I could justify running this engine. And I would just replace the engine for a new long block assembly for about $6000. I'm pretty sure it will last longer but no way of telling in these conditions.
I like the constant speed prop so far. Yes electric
Reply With Quote
  #42  
Old 06-21-2022, 06:55 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 7,472
Default

Quote:
Originally Posted by Teal View Post
Displacement is 1000cc or about 60cu in.
Currently running 2.85:reduction
Cruise RPM's is 6000-6500 rpm.
Some would call this screaming compared to the much larger displacement direct drive aircraft engines. But at 6500 the piston speeds are slower that a 0-320 running at 2500.

I have no idea at this time of TBO. I used 500 hours as a number that I could justify running this engine. And I would just replace the engine for a new long block assembly for about $6000. I'm pretty sure it will last longer but no way of telling in these conditions.
I like the constant speed prop so far. Yes electric
200HP out of a 60CI engine is impressive! Do you know BSFC at 150HP?
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
Reply With Quote
  #43  
Old 06-21-2022, 07:46 AM
Teal Teal is offline
 
Join Date: Jun 2022
Location: buckeye
Posts: 20
Default

Quote:
Originally Posted by lr172 View Post
200HP out of a 60CI engine is impressive! Do you know BSFC at 150HP?
Currently we are running about 12.8-13:1 AFR's and even richer above about 140hp. The next series of flight test will be running a tune that brings AFR's closer to 13.5 in cruise throttle settings. currently BSFC in most areas it is right around .5 and up to .65 in wot. Since you asked and I am really curious what does your Lycoming run in cruise and also at 150hp throttle settings for BSFC?
Reply With Quote
  #44  
Old 06-21-2022, 09:22 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 7,472
Default

Quote:
Originally Posted by Teal View Post
Currently we are running about 12.8-13:1 AFR's and even richer above about 140hp. The next series of flight test will be running a tune that brings AFR's closer to 13.5 in cruise throttle settings. currently BSFC in most areas it is right around .5 and up to .65 in wot. Since you asked and I am really curious what does your Lycoming run in cruise and also at 150hp throttle settings for BSFC?
I have never really tracked percentage power at cruise. I cruise at 165 KTAS in the 10 (IO-540) at around 10.5 GPH at 8-9K. I believe the power is in the 60% range, maybe less. That would be approx 155 HP. At 14K, I am getting under 9.5 at the same speed. In the 6A with the 320/160hp, I am getting 160 KTAS and 8.1 GPH at 8-9K. No idea on the HP and that is 2730 with an FP prop.

My research here says that most Lyc's are in the .45 BSFC range when run LOP with balanced injectors and EI with optimized timing.

Larry
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019

Last edited by lr172 : 06-21-2022 at 09:29 AM.
Reply With Quote
  #45  
Old 06-21-2022, 09:45 AM
Teal Teal is offline
 
Join Date: Jun 2022
Location: buckeye
Posts: 20
Default

Quote:
Originally Posted by lr172 View Post
I have never really tracked percentage power at cruise. I cruise at 165 KTAS in the 10 (IO-540) at around 10.5 GPH at 8-9K. I believe the power is in the 60% range, maybe less. That would be approx 155 HP. At 14K, I am getting under 9.5 at the same speed. In the 6A with the 320/160hp, I am getting 160 KTAS and 8.1 GPH at 8-9K. No idea on the HP and that is 2730 with an FP prop.

My research here says that most Lyc's are in the .45 BSFC range when run LOP with balanced injectors and EI with optimized timing.

Larry
Thanks for the numbers, I really don't think that I can do better than .45 SPFC even though this fuel injection is computer controlled and more precise than mechanical aviation type. I feel that the large displacement slower turning RPM will most likely extract more energy but time will tell.
Reply With Quote
  #46  
Old 06-21-2022, 10:13 AM
Teal Teal is offline
 
Join Date: Jun 2022
Location: buckeye
Posts: 20
Default

Quote:
Originally Posted by lr172 View Post
I have never really tracked percentage power at cruise. I cruise at 165 KTAS in the 10 (IO-540) at around 10.5 GPH at 8-9K. I believe the power is in the 60% range, maybe less. That would be approx 155 HP. At 14K, I am getting under 9.5 at the same speed. In the 6A with the 320/160hp, I am getting 160 KTAS and 8.1 GPH at 8-9K. No idea on the HP and that is 2730 with an FP prop.

My research here says that most Lyc's are in the .45 BSFC range when run LOP with balanced injectors and EI with optimized timing.

Larry
My last flight I show 178KTAS and 10kft MSL at WOT and it was burning about 18GPH! But I think I was well above the airframes good efficiency range for cruise.
I would be interested in cruising at what other RV-9 pilots are and try to duplicate the same conditions and compare numbers. I was going to look around a bit at the other threads about efficiencies and get these numbers but if there are any -9 pilots on here listening I would be happy to go up and use your cruise numbers to compare fuel burn.
Reply With Quote
  #47  
Old 06-21-2022, 10:31 AM
kaweeka kaweeka is offline
 
Join Date: May 2011
Location: Roseville
Posts: 484
Default

My -9A has an IO-320 at 9:1 compression, dual lightspeed and AFP injection. I'm pretty consistent at 8,000-9,000 ft 147kts TAS, 6.7 gph, and 25* LOP. 64% power.
__________________
RV-9A N435KR, Vans calendar March 2018
LIO 320 B1A, Dual LS Plasma III, AFP injection
G3x touch
Roseville, Ca
Reply With Quote
  #48  
Old 06-21-2022, 10:36 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 7,472
Default

Quote:
Originally Posted by Teal View Post
Thanks for the numbers, I really don't think that I can do better than .45 SPFC even though this fuel injection is computer controlled and more precise than mechanical aviation type. I feel that the large displacement slower turning RPM will most likely extract more energy but time will tell.
I wouldn't expect you could beat the lyc BSFC numbers, but in the end, the lower acquisition, parts and overhaul costs will more than offset a few BSFC points.
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
Reply With Quote
  #49  
Old 06-21-2022, 01:13 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
Join Date: Jan 2005
Posts: 3,767
Default

I flightplan for 8500’ economy cruise at 150kts TAS @ 7.0gph with 160hp, 0-320, dual mags. Usually comes out pretty close to this. Can do a bit better if I climb up above 10-11K.
__________________
Steve M.
Ellensburg WA
RV-9 Flying, 0-320, Catto

Donation reminder: Jun. 2023

Last edited by alpinelakespilot2000 : 06-21-2022 at 01:16 PM.
Reply With Quote
  #50  
Old 06-21-2022, 04:44 PM
Chkaharyer99 Chkaharyer99 is offline
 
Join Date: Oct 2011
Location: Pilot Hill, CA
Posts: 880
Default

Teal,

What fuel are you running?
__________________
Charlie
RV-8
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 07:43 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.