flyrotary@lancaironline.net Mailing List Archive

Thanks, Ed....my water temps would actually decrease during a climb prior to installing the ram air scoop. Now they do not. Ram air scoop has to go. I am going to install a NACA scoop on the bottom of the winglet, with 3 inch sceet tubing going to the plenum I will make for the throttlebody. Incoming air will only be able to go to the throttlebody, not the low pressure area of the cowling. My present temps are marginally acceptable. I prefer the temps I had before the ram air scoop (at the same throttle settings/rpm's). Sorry you can't make it to Sun-N-Fun. Paul Conner

----- Original Message -----

From: Ed Anderson

To: Rotary motors in aircraft

Sent: Sunday, April 10, 2005 7:04 AM

Subject: [FlyRotary] Re: SQ2000 flying again

Paul,

Far from discouraging, I think your temps are quite reasonable for the regime of flight you are in. If you don't heat up a bit during climb, then for sure you have more cooling capacity than needed at cruise - which is not necessarily bad except from a drag standpoint. The sleeker the aircraft the higher percentage of total drag the cooling drag is. My coolant is red-lined at 220F (and I have exceeded that all the way up to 240F), my oil is redlined at 210F and thus far I have not exceeded that limit.

John is correct as well, more power will produce more heat - so again something to cheer about.

Sealing off even small leaks will help considerably - that is one reason I went with the fiberglass ducts total enclosing my radiator face and nowhere for the air to go but through the core.

In Any case, sounds like things are progressing nicely to me.

Ed A

----- Original Message -----

From: Paul

To: Rotary motors in aircraft

Sent: Sunday, April 10, 2005 1:33 AM

Subject: [FlyRotary] SQ2000 flying again

I flew the SQ2000 today. The engine is running great, now that I have a seperate water temp sender for the ECU and another for the engine monitor. The outside air temp was 80 degrees, and I am very disappointed with my coolant temps. The water temp hit 205 during the climb. Temps slowly came back down to 190 once I was in level flight, and dropped to 170 on short final. Very disappointing. (oil temps were fine). I am going to seal all the gaps around the radiator first, and see if that helps. I am concerned that the new ram air scoop I made to bring in cool air to the throttlebody might be pressurizing the rear of the cowling, and inhibiting the induction of air through the radiator. I will try sealing around the radiator first. If that fails to bring the temps down, I will try removing the ram air scoop and installing a NACA scoop with a hose to bring air directly to the throttlebody, and not dump it into the low pressure area of the cowling. If that fails, I think I will take up fishing or golf.

Paul Conner, 13b powered SQ2000 in Mobile, AL

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