Removed The Oil Sump Baffle

 When I repaired all the old engine baffles I added one in front of the oil sump to help direct cool air around it and to deflect hot air from the cylinders.  The idea came from this baffle one on my Cessna 140.  It also has a Continental C-85.  I assumed they knew what they were doing when they went to all the trouble to make this baffle for the Cessna.

The baffle has a hole in it for the throttle cable but covers the sump.

The big difference in mine and theirs is the nice curved shape of their baffle.  Mine is much flatter and as a result a little wider because I quit working the metal once I had this shape.

My concern was that this flatter baffle was blocking airflow so I removed it and went flying.

A nice evening in the upper 70s, with high clouds, meant a smooth fun flight.  Unfortunately no change in cylinder head temps.  The oil temperature seamed to come up a little quicker so I think I'll finish shaping this baffle to fit the buck I made from the C-140 baffle and reinstall it.

Now that the winds have died down I have some more things to try.

Another Nice Evening Flying

We had a light breeze at about 45 degrees from the left of the runway, but otherwise a very nice evening.  I flew for about 50 minutes.

Looking east at Lake Anna, the nuclear cooling pond.

Farm Country north of our home.

This building is one of three green houses near us, more like a green factory. This one is American Colors, which is a few miles north east of our house.

We have a lot of trees in Virginia.

I waited for the sun to get low enough that the mountains, on the west side of the runway, blocked the sun.  Much easier landing when the runway is in the shadow.

Nice Evening Flight

 Just back from 45 minutes flying on a nice evening, calm, clear, reasonably dry air at 75 degrees.  Just forgot to take the camera.  Everything was so green, really nice.  

No real change in the motor cooling. For now I'm just having fun flying, until they close the runway for repaving in July.

New Cooling Outlet Skirt

 

When I made the last skirt it I made it with a steeper angle, from the bottom of the cowl.  I decided to make another one to replace it at a shallower, more streamlined, angle to see what happens to the cooling.

It's still the same length, about 3 1/2".  

I riveted it to the front of the short skirt, from a couple versions back, so I had to locate the old rivet holes without taking the cowl off, etc.  Some of the holes were easy to mark from the back side.  I made a card stock pattern of the new skirt until I had a pretty good fit, adding holes as I trimmed it to fit.

Some of these holes were well located, others had to be adjusted to get the pattern properly positioned.  As a result I couldn't easily use them to transfer the locations to the aluminum skirt.  Instead, once I had it Clecoed in the proper position, I drew a circle up close around each Cleco clamp.

I punched a hole at one end of the strip of aluminum, with the Whitney Punch, and used it to Cleco one end of the pattern in place.  Then I punched a hole at the other and Clecoed it, so the pattern wouldn't move.

I used my Optical Center Punch, centered on each circle, to mark the center of each rivet hole.  The Cleco housing is slightly smaller in diameter than the hole in the base of my Grizzy Optical Center Punch.  Looking through the magnifier lens you align the drawn circle with the edge of the hole and mark the center.

How well did it work?  I made the skirt at home and Alodined it, finished, done, took it to the airport and Clecoed it in place.  Every hole fit perfect.  A light clean up of the new 1/8" holes with the #30 drill and all the rivets went right in, not bad.  

Now I just need to go flying.  It was close to dark when I finished.