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.

  #11  
Old 05-18-2022, 12:17 PM
MMiller MMiller is offline
 
Join Date: Oct 2010
Location: Babylon NY
Posts: 78
Default

Quote:
Originally Posted by Piper J3 View Post
... Can you elaborate on why this happens and amount of possible error at high end of scale? ....
The error is related to the voltage drop in the grounding to the D180. Worst case was calculated at 180mV and best case, in practice, is about 25mV. It’s dependent on the alternate ground paths through the tray.
Click image for larger version

Name:	786A30D6-C58B-400A-A53B-209A6EB7F596.jpeg
Views:	44
Size:	263.5 KB
ID:	25961
If you do the test I recommended, you can calculate the the system’s voltage drop. Using the two values from the test, it’s the difference between the low temp voltage and high temp voltage from the table on the attached chart.
Attached Thumbnails
Click image for larger version

Name:	668003E2-5553-4D2B-ACFD-F507E6761F7D.jpg
Views:	47
Size:	206.1 KB
ID:	25960  
Reply With Quote
  #12  
Old 05-18-2022, 02:55 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,735
Default

Mike -

Thanks for explanation. I will perform this test soonest... I assume I can shut off Master Switch in the air? Just thought I'd ask before doing something risky....
__________________
-
Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 780

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
Reply With Quote
  #13  
Old 05-18-2022, 05:25 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,266
Default

Jim,

I’ve been offline and just saw your question about my climb temperatures. I usually get to about 2500-3000 feet before I level off, throttle back to 4800 RPM to cooldown back to the top of the green arc. Then I resume the climb.

The paddle deflectors and trimmed canopy seem to speed the cooldown process considerably.


Rich
Reply With Quote
  #14  
Old 05-20-2022, 09:03 AM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,735
Default

I have add’l data that suggests I will have high oil temps in the heat of summer. I may be restricted to flying early morning or evenings to mitigate problem to get me through flying season and then make permanent fix. I’m thinking about moving oil coolant radiator forward to add clearance to muffler.

Does anyone have photos / info on this modification done on an early SN legacy RV-12? Thanks in advance….
-
Attached Thumbnails
Click image for larger version

Name:	Screen Shot 2022-05-20 at 11.01.59 AM.png
Views:	14
Size:	22.6 KB
ID:	26019  
__________________
-
Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 780

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
Reply With Quote
  #15  
Old 05-20-2022, 12:24 PM
lewy lewy is offline
 
Join Date: Nov 2009
Location: Jackson Ohio
Posts: 140
Default Hose length

Will your oil lines be long enough if you move your oil cooler forward?
Reply With Quote
  #16  
Old 05-20-2022, 02:24 PM
azonslow azonslow is offline
 
Join Date: Mar 2017
Location: Maricopa County, AZ
Posts: 9
Default

Piper J3 check your PMs
Reply With Quote
  #17  
Old 05-20-2022, 04:45 PM
DaveWelch DaveWelch is offline
 
Join Date: Mar 2005
Location: Huntsville, AL
Posts: 484
Default

Jim, I’ll attempt to attach photos taken as I modified my lower cowl to move the oil cooler forward.
Attached Thumbnails
Click image for larger version

Name:	3DFC4C74-F69C-400A-AC11-345D0D7DB8DE.jpeg
Views:	30
Size:	740.6 KB
ID:	26041  Click image for larger version

Name:	AB68641A-08E1-4052-A4FD-F643275C45B4.jpeg
Views:	31
Size:	684.0 KB
ID:	26042  Click image for larger version

Name:	FE9D018E-4FE2-4528-9B05-D1F2932EA664.jpeg
Views:	29
Size:	783.4 KB
ID:	26043  Click image for larger version

Name:	E76E5B26-E70B-46A4-853E-02F082CA6495.jpeg
Views:	25
Size:	684.0 KB
ID:	26044  
__________________
Dave
RV12 N951DZ
First Flight 9/23/16!
No paint yet. Working on a scheme with John Deere colors or accents.
Reply With Quote
  #18  
Old 05-20-2022, 04:56 PM
DaveWelch DaveWelch is offline
 
Join Date: Mar 2005
Location: Huntsville, AL
Posts: 484
Default

The photos aren’t in sequence but you get the idea.
I uses a length of 1” painters tape to establish cut lines.
I used some of the removed fiberglass to make “clips” to hold the duct/radiator mount to glass it in place.
Note that I also cut and re-glassed an indentation for exhaust pipe clearance.
Hope this is helpful!
__________________
Dave
RV12 N951DZ
First Flight 9/23/16!
No paint yet. Working on a scheme with John Deere colors or accents.
Reply With Quote
  #19  
Old 05-20-2022, 04:58 PM
DaveWelch DaveWelch is offline
 
Join Date: Mar 2005
Location: Huntsville, AL
Posts: 484
Default

Oh, my kit #was 120. The oil hoses were just long enough to reach the cooler after moving it forward.
__________________
Dave
RV12 N951DZ
First Flight 9/23/16!
No paint yet. Working on a scheme with John Deere colors or accents.
Reply With Quote
  #20  
Old 05-20-2022, 06:10 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,735
Default This is Very Interesting….

azonslow pointed me to Rotax Service Instruction Titled: Selection of Suitable Operating Fluids for ROTAX® Engine Type 916 i (Series), 915 i (Series), 912 i (Series), 912 and 914 (Series). The publication is dated May 28, 2021. pdf file is d06902.pdf in the Technical Documentation Section of https://www.flyrotax.com.

Section 6 states:

6) General Engine Operation Requirements and Operating Tips

1. Keep the engine oil temperature below 120 °C (250 °F) over most of the operating period.
2. Always ensure that the oil type used is adequate for climatic conditions and peak engine operating temperatures. If operational oil temperatures exceed 120 °C (250 °F), use of a mineral or petroleum based oil is not recommended.
3. For turbocharged engines ensure an adequate running cool-down period to prevent deposits by coking of oil.
4. When operating with unleaded fuels or MOGAS and when engine oil temperatures often exceed 120 °C (250 °F) use of a high quality full synthetic oil is recommended.
5. To avoid formation of condensation water in the engine oil, the oil temperature must rise at least once every operational day to at least 100 °C (212 °F).
6. Avoid extended use of carburetor air pre-heating when safe and reasonable.
7. AutomotivefuelshaveseasonalblendsandMUSTbeusedinth ecorrectseason.Failuretodo so can cause hard starting or serious issues like vapor lock.
8. Depending on the type of fuel used, operating conditions, and the demands of the engine mission profile it may be necessary to increase the frequency of oil changes to avoid the excessive build- up of lead and other residues in the engine oil. Always adjust the engine oil change intervals to avoid excessive build-up of sludge in the engine oil.
__________________
-
Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 780

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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 04:43 AM.


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.