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Dave, I can’t argue with your adequate theory; I have that for my oil cooling system, along with the temperature-controlled Mazda oil cooler, I never worry
about oil temperature.
It’s the practical application of that theory to the radiator installation that has plagued me from the beginning … after the next flight I’ll know where I
stand and if there’s still a problem, then radical change may have to be the recipe.
Jeff
From: David Leonard [mailto:flyrotary@lancaironline.net]
Sent: Tuesday, May 05, 2015 9:31 PM
Subject: Re: [FlyRotary] Re: Return to Flight
I agree with Bobby, this may (hopefully) be the cause, but if so it just means that you didn't design in an adequate way to fill the coolant without trapping air. You would hate to have to do a coolant-prep flight every time you wanted
to drain and refill the coolant. (but not the end of the world).
I originally designed my system like Ed's. Minimal drag (just the 2 stock RV-6 inlets) but cooling was like you and Ed describe... OK, but you always have to keep and eye on it and often reduce power or AOA in order to keep coolant temps
in check. Then I made a major change to provide TONS of air to an adequately sized radiator. Since, I never even think about cooling. Yes, I do probably burn a little more fuel but it is well worth it to never worry about cooling again. Its not rocket
science. Adequate air to an adequate radiator equals adequate cooling. Change adequate to plenty in that sentence and now your are rocking!
On Mon, May 4, 2015 at 12:37 PM, Bobby J. Hughes <flyrotary@lancaironline.net> wrote:
Jeff,
Congratulations on getting back in the air. That ½ quart of coolant may have been trapped air that purged during flight.
Bobby Hughes
N416AS-
RV10 223 hrs
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Monday, May 04, 2015 7:53 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Return to Flight
Yesterday 3-May, my bird got airborne once again on its maiden flight after 2+ years rebuilding. I had a friend test-pilot fly it while I was flight engineer watching the gauges.
Flight controls and rigging were reported to be good and the engine performed flawlessly. The oil temperature was stable around 160F (Mazda oil cooler in series with a Fluidyne) but again the water temperature was high reaching 210F by circuit height so we
backed off the throttle, did a touch and go with a 500’ circuit and parked it. One unusual result was the cooling system pressure was only at 5-6 psi; with the high temperature it should have been 15-16 psi. Removed the cowlings and found no leaks of either
oil or glycol. I checked the coolant level and it was down, requiring 1/2 quart to top it up. I also looked at my pinched duct and think it needs more pinching, so am already starting to modify that – hope to get another test flight in before the weekend.
Jeff
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