RV News That Caught My Eye Over The Last Few Hours ….dr
__________________________
RV9A N442TC first flight today
vansairforce.net
3D Printed Oil Cooler Plenum…00Dan
Finally got around to printing a plenum and turning elbow. The PETG bell mouth has held up surprisingly well, with no signs of heat distortion despite having a Tg of only ~176*F. Granted, it’s not really under any loads beyond its own weight. I had in my mind the general shape I wanted everything to take so I took some rough dimensions and got to work on the computer. Turning vanes are integrated into the elbow, and the plenum internal vanes borrows from hgerhardt’s design. On its face it looks nicer, trading that tight radius SCAT run for a much shorter straight section. The elbow will be reprinted to line up with the baffling a bit better before I actually test it.
The parts pictured were FDM printed out of ASA, which has a Tg of 208*F; I believe this is good enough to go fly and see how it holds up, and definitely good enough for testing the design. Fastener preload at the oil cooler face will hopefully let me know if the material is holding up or if I need to make a final production run with nylon.
vansairforce.net
Undercut AN426 rivet?
vansairforce.net
KAI 11-02 (rev 1), rod end bearing adjustment questions …DonMcKee PIREP
I guess I may be over-thinking this, and suffering from a bit of analysis-paralysis when it comes to finalizing my rod end bearing adjustments. Given these constraints:
vansairforce.net
Update …jrskygod
For the last few days I have worked on the intake valve burning issue I previously reported. I removed the intake tube from my #4 cylinder to get easier access to the valve for lapping in place to correct the burning issue. What I found surprised me. As you can see the back side of the valve had significant buildup on it. Apparently some of carbon had broken off and was caught in the seat of the valve causing the burning issue. I cleaned the valve, lapped it and now my leak is gone. I then decided to check the remaining valves. Number 2 had similar buildup to number 4, however cylinder 1 and 3 only had minor buildup and what you would expect for a 1000 hour engine. I cleaned up all of the intakes and all is well. What I am curious about is why the carbon buildup and why there is significantly more on one side than the other.
vansairforce.net
Published: SB-00102 - Control Stick Pushrod Inspection (before further flight) …RV-12
This service document directs owners/operators to inspect flying aircraft before further flight. Van’s Aircraft has recently become aware of an EAB RV-12 where it appears that the pilot’s side control stick became disconnected in flight due to improper assembly of the F-1264 Control Stick Pushrod Assembly. Out of an abundance of caution this service bulletin requires an inspection of the F-1264 Control Stick Pushrod Assembly, the correct installation of jam nuts, and proper orientation of rod end fittings.
www.vansairforce.net
OFF TOPIC:
PS: Older issues of the ‘VAF News’ can be found at:
www.vansairforce.net
__________________________
RV9A N442TC first flight today
RV9A N442TC first flight today
Started building 9-1-22. Took 4 months to paint it myself. First flight today. Flew straight and true, just like a plane should. No squawks. Can't wait to fly it again tomorrow.
vansairforce.net
3D Printed Oil Cooler Plenum…00Dan
Finally got around to printing a plenum and turning elbow. The PETG bell mouth has held up surprisingly well, with no signs of heat distortion despite having a Tg of only ~176*F. Granted, it’s not really under any loads beyond its own weight. I had in my mind the general shape I wanted everything to take so I took some rough dimensions and got to work on the computer. Turning vanes are integrated into the elbow, and the plenum internal vanes borrows from hgerhardt’s design. On its face it looks nicer, trading that tight radius SCAT run for a much shorter straight section. The elbow will be reprinted to line up with the baffling a bit better before I actually test it.
The parts pictured were FDM printed out of ASA, which has a Tg of 208*F; I believe this is good enough to go fly and see how it holds up, and definitely good enough for testing the design. Fastener preload at the oil cooler face will hopefully let me know if the material is holding up or if I need to make a final production run with nylon.
Oil cooler optimization
I'm looking to further optimize my oil cooler setup, in a ROP cruise I'm seeing temperatures between 210-220 *F at OATs of around 40*; CHTs in this cruise regime are 380-390*; my engine is a parallel valve 320 with piston squirters. My cooler is a 7 row Aero Classic (PN 8000075) supplied by -8...
vansairforce.net
Undercut AN426 rivet?
Undercut AN426 rivet?
I did a very uneven job of countersinking my aileron attach bracket - the rivet head is undercut on one side. What do you think? Replace? I emailed vans a while back, but have not heard from them on this. I'm sure they'll get to it eventually. I would appreciate your wisdom. Also, tips on...
vansairforce.net
KAI 11-02 (rev 1), rod end bearing adjustment questions …DonMcKee PIREP
I guess I may be over-thinking this, and suffering from a bit of analysis-paralysis when it comes to finalizing my rod end bearing adjustments. Given these constraints:
KAI 11-02 (rev 1), rod end bearing adjustment questions
I'm just getting started on section 11, Empennage Attach, adjusting elevator rod end bearings while fretting about drilling the elevator horns. On the left elevator, adjusting both rod end bearings to the recommended 13/16" height resulted in an even 1/8" gap front-to-back between the...
vansairforce.net
Update …jrskygod
For the last few days I have worked on the intake valve burning issue I previously reported. I removed the intake tube from my #4 cylinder to get easier access to the valve for lapping in place to correct the burning issue. What I found surprised me. As you can see the back side of the valve had significant buildup on it. Apparently some of carbon had broken off and was caught in the seat of the valve causing the burning issue. I cleaned the valve, lapped it and now my leak is gone. I then decided to check the remaining valves. Number 2 had similar buildup to number 4, however cylinder 1 and 3 only had minor buildup and what you would expect for a 1000 hour engine. I cleaned up all of the intakes and all is well. What I am curious about is why the carbon buildup and why there is significantly more on one side than the other.
Interesting find today
I'm doing my condition inspection and the intake valve on #4 cylinder apparently has an issue. Compression on that cylinder went from 78# to 74# in the last 18 hours and when borescoped it has a definite hot spot. I really don't want to pull the cylinder unless necessary so what should be my...
vansairforce.net
Published: SB-00102 - Control Stick Pushrod Inspection (before further flight) …RV-12
This service document directs owners/operators to inspect flying aircraft before further flight. Van’s Aircraft has recently become aware of an EAB RV-12 where it appears that the pilot’s side control stick became disconnected in flight due to improper assembly of the F-1264 Control Stick Pushrod Assembly. Out of an abundance of caution this service bulletin requires an inspection of the F-1264 Control Stick Pushrod Assembly, the correct installation of jam nuts, and proper orientation of rod end fittings.
Published: SB-00102 - Control Stick Pushrod Inspection (inspect before further flight)
Van's has published Service Bulletin SB-00102 - Control Stick Pushrod Inspection. This service document directs owners/operators to inspect flying aircraft before further flight. Van’s Aircraft has recently become aware of an EAB RV-12 where it appears that the pilot’s side control stick became...
www.vansairforce.net
OFF TOPIC:
PS: Older issues of the ‘VAF News’ can be found at:
Doug's Area ....The VAF News & my flying resume.
Pushed out every now and then.
www.vansairforce.net
