Hi, Kelly...mostly due to the ram air scoop's location. The intake plenum would be very difficult to construct to end up at the very large ram air intake scoop. Much easier to seal it off and install either a NACA or a ram air intake on the bottom of the bottom cowling extension and just use a 3 inch hose. The NACA duct comes preformed with a 3 inch outlet for a hose, and I just ordered an aluminum flange for a 3 inch hose to attach to the throttlebody plenum. I can install the whole thing in a weekend with all these pre-cabbed parts. Paul, just call me lazy, Conner

 

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

From: Kelly Troyer

To: Rotary motors in aircraft

Sent: Sunday, April 10, 2005 7:53 PM

Subject: [FlyRotary] Re: SQ2000 flying again

Paul,

   May I ask why not retain the ram air scoop and seal it to the

intake plenum thereby keeping the manifold pressure increase

that it gives you at speed ??

--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2

-------------- Original message from "Paul" <sqpilot@bellsouth.net>: --------------

Hi, John....the only thing you are missing is that I used to be able to cool down in the climb. Now, at the same throttle setting, I can not. Only addition has been the ram air scoop dumping air in the vicinity of the throttlebody. (High pressure air being forced into a low pressure area of the cowling). I believe that is hindering the ability of the air to enter the NACA duct and go through the radiator.  Paul Conner

 

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

From: John Slade

To: Rotary motors in aircraft

Sent: Sunday, April 10, 2005 6:45 AM

Subject: [FlyRotary] Re: SQ2000 flying again

Great Paul, but what's wrong with those temps and what are your targets? Obviously the temps are going to be a bit higher if you're producing more power. I remember Leon saying that the most efficient operating temp, at least for a 3rd gen REW, was around 180F.  220F was, I'm pretty sure he said, the red line and you don't want to be there for long. If you can cruise at 190 at, presumably, fairly low altitude then I'd say you're about right and you'll get 180 on a high altitude cruise.

Am I missing something here?

John

 

 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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