New NACA VGs

New NACA VGs

Based on a study thatĀ David UllmanĀ did on VGs for the top of the Velocity, specifically to generate better airflow into the cooling NACA ducts, I’ve decided to replicate his experiences. He determined that larger vortex generators that are typically used on airfoils would be required to get into the high energy air at the edge […]

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Engine Cooling Runner Diversion Ducts

Engine Cooling Runner Diversion Ducts

Here you can see we’ve added angled ducts to the sides of my NACA runners. I hope to do two things here, well, maybe three. I don’t want to suck rain (1) into the engine, so I was moving to the side discharge. I would also like to get better ram air flow (2) into […]

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New Engine Cooling Plenum

So, we’re building this new cooling plenum. My engine always cooled fine, but I had issues with the runner to NACA junction and the plenum was a little fragile the way I had cut the built the runner-to-plenum junctions. I also wasn’t very happy with the wire grommet or spark plug and oil filler access. […]

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New Engine Cooling Plenum – Rear Extension

New Engine Cooling Plenum – Rear Extension

Here you can see we’ve extended the cooling plenum onto the engine. You can see we’ve used my buddy Andy’s trick of waxing the engine so the glass doesn’t stick. Andy has gone to a bunch more effort to seal off his engine, but since we didn’t have cooling issues before, and we expect our […]

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Forming NACA Runner Diversion Ducts

Forming NACA Runner Diversion Ducts

The runner modifications are nearly done now, the hinges are on to mate the two halves together, and the stubs are firmly bonded to the fuselage. The only thing remaining is to add the new ducts for the engine and oil cooler on the side of the runners. Forming the duct glassed extensions Runner stub […]

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Moving Engine Intake and Rear Oil Cooler Air Duct Connections

Moving Engine Intake and Rear Oil Cooler Air Duct Connections

We’ve moved both the engine air intake and the rear oil cooler intakes from the bottom to the sides, and have made slanted pick-ups that should improve the airflow. Since the premolded engine cooling NACA ducts don’t seem to be covered elsewhere in the manual, I’ll include them here. Much of the cutting was completed […]

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