Yep, the next step in the process (after verifying = that there=20 is good pressure in front of the rads) is to make sure the pressure is = not too=20 high behind the rads. Sounds like yours was. Mine is = moderate (2 -=20 3" H2O depending on airspeed) with the stock RV-4 outlet which is about = 2.5" X=20 18". My cooling improved by about 5 - 6 degrees when I rounded the = sharp=20 corner at the bottom of the firewall to reduce turbulence at the=20 outlet. This also improved the velocity of the exit air which = reduces=20 drag.

Your temps are pretty good. My oil will go a = little over=20 210 under the conditions you listed. A cowl flap would probably = improve=20 this but it is easy to keep it lower by backing off to around 23" = MAP. ROC=20 is still over 1000 fpm at that setting so it hasn't been an operational=20 problem. At around 90 OAT I can use WOT in = climb.

Tracy

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

From:=20 Bill = Eslick=20

To: Rotary motors in = aircraft

Sent: Tuesday, August 05, 2003 = 10:26=20 PM

Subject: [FlyRotary] Re: = Cooling /=20 Pressure recovery

NOW you come up with this! I already did it the = hard=20 way. Pressure recovery was good, and the biggest = improvement came=20 from opening up the cowl flap. I made a new one that is = about=20 twice the size of the original. Now I can climb out at 25 = inches=20 MAP with OAT over 100F, and the oil stays under 200, and the = coolant=20 stays about 205. Does that sound reasonable for = temps?

Bill Eslick

-------Original=20 Message-------

> There is quite a bit more but = here is=20 the key
part. Use an extra
> airspeedindicator to = measure the=20 pressure at
various places around
> the heat
>=20 exchangers, especially the 'front' side.

____________________________________________________
IncrediMail - Email has finally = evolved -=20 Click=20 Here

>> Homepage: =20 http://www.flyrotary.com/
>> Archive: =20 = http://lancaironline.net/lists/flyrotary/List.html
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