From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: [FlyRotary] Re: water coolant percentages Date: Tue, 20 Apr 2004 01:49:44 +0000 Content-Type: Multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_28608_1082435968_1" --NextPart_Webmail_9m3u9jl4l_28608_1082435968_1 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message ----- From: Bill Dube Sent: Monday, April 19, 2004 4:47 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: water coolant percentages If you dont need the high freeze protection, Id opt for corrosion inhibit= ors in a solution of maybe 25-30% e-g in water (for some increase in boil= ing point), and a pressure cap of 22-25 psig. =20 As noted earlier, all airplanes need freeze protection. I was fly= ing recently in Tampa at night and the temperature at 15,000 ft was somet= hing like -10 Celsius. =20 Water will often freeze in the radiator if you do not have anti-f= reeze, even if the engine is warm. The freeze will start in a low flow (w= ater) region and will then spread as the flow is further blocked, perhaps= bursting radiator tubes as it progresses. =20 I suppose this might be possible at a low power setting and while using a= thermostat. The problem can be completely avoided if you use a cowl fla= p for temperature control instead of thermostat. Restrict the airflow th= rough the rad and the coolant stays hot. Reduced cooling drag is a bonus= too. Tracy --NextPart_Webmail_9m3u9jl4l_28608_1082435968_1 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
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----- Original Message -----
From: Bill Dube
Sent: Monday, Ap= ril 19, 2004 4:47 PM
To: Rot= ary motors in aircraft
Subject:<= /B> [FlyRotary] Re: water coolant percentages
 

If you dont need the high freeze protection, Id opt for corrosion = inhibitors in a solution of maybe 25-30% e-g in water (for some increase = in boiling point), and a pressure cap of 22-25 psig.
=


        As= noted earlier, all airplanes need freeze protection. I was flying recent= ly in Tampa at night and the temperature at 15,000 ft was something like = -10 Celsius.

       &nb= sp;Water will often freeze in the radiator if you do not have ant= i-freeze, even if the engine is warm. The freeze will start in a low flow= (water) region and will then spread as the flow is further blocked, perh= aps bursting radiator tubes as it progresses.
   = ;     

 

I suppose this might= be possible at a low power setting and while using a thermostat.&nb= sp; The problem can be completely avoided if you use a cowl flap for temp= erature control instead of thermostat.  Restrict the airflow through= the rad and the coolant stays hot.  Reduced cooling drag is a bonus= too.

Tracy

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