X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d21.mx.aol.com ([205.188.144.207] verified) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTP id 1239791 for flyrotary@lancaironline.net; Mon, 17 Jul 2006 09:04:44 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.144.207; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-d21.mx.aol.com (mail_out_v38_r7.5.) id q.4ba.2db78680 (29678) for ; Mon, 17 Jul 2006 09:03:49 -0400 (EDT) From: Lehanover@aol.com Message-ID: <4ba.2db78680.31ece4b5@aol.com> Date: Mon, 17 Jul 2006 09:03:49 EDT Subject: Re: [FlyRotary] Re: Cooling coupling To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1153141429" X-Mailer: 9.0 Security Edition for Windows sub 5319 X-Spam-Flag: NO -------------------------------1153141429 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en =20 In a message dated 7/17/2006 7:42:59 A.M. Eastern Daylight Time, =20 prvt_pilot@yahoo.com writes: I=E2=80=99m thinking about this regarding cooling on the ground, and if I= =E2=80=99m going=20 to work on reducing one or the other, which might have the greater benefit.= =20 As it is now, the oil gets to 220F about the time the coolant gets to 210F.= =20 Options under consideration are a fan behind the coolant rad; and a water=20 spray setup for the oil cooler.=20 Al Not as much interaction as a piston engine. The oil temp can be controlled =20 with the throttle.=20 If the race car starts to overheat the oil, the driver sort shifts about =20 1,000 RPM (9,500 RPM instead of 9,600 RPM) and the oil starts to cool down a= =20 bit. At airplane RPM the oil can be abused in that the bearing loads are not= =20 high between 6,000 and 7,000 RPM.=20 =20 Oil is a poor conductor. So the rotor faces may be well above 350 degrees a= s=20 the oil temp is on the way up to temp. Oil temps may be worse as time (of =20 each heat cycle) goes by as foaming adds air to the oil. Foamed oil picks up= =20 less heat from the rotors and releases less heat into the cooler. Not as big= a =20 problem for the NA engine. Big problem for the turbo engine. =20 Coolant temp out of control can crush the rotor housings. I would work on=20 the water first. Use a synthetic oil in the sump, and an OMP adaptor for 2 cycle oil in the =20 housings.=20 We use RedLine 40 Wt. racing oil in the sump and RedLine racing 2 cycle in =20= a=20 premix, but there are less expensive Synthetics. =20 Coolant is distilled water with 10% antifreeze and a bottle of Water-Wetter=20= =20 and a 22 pound pressure cap. =20 Lynn E. Hanover =20 -------------------------------1153141429 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en
In a message dated 7/17/2006 7:42:59 A.M. Eastern Daylight Time,=20 prvt_pilot@yahoo.com writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>

I=E2=80=99m thinking about= this=20 regarding cooling on the ground, and if I=E2=80=99m going to work on reduc= ing one or=20 the other, which might have the greater benefit.  As it is now, the o= il=20 gets to 220F about the time the coolant gets to 210F.  Options under=20 consideration are a fan behind the coolant rad; and a water spray setup fo= r=20 the oil cooler.

 

Al

Not as much interaction as a piston engine. The oil temp can be control= led=20 with the throttle.
If the race car starts to overheat the oil, the driver sort shifts abou= t=20 1,000 RPM (9,500 RPM instead of 9,600 RPM) and the oil starts to cool down a= =20 bit. At airplane RPM the oil can be abused in that the bearing loads are not= =20 high between 6,000 and 7,000 RPM.
 
Oil is a poor conductor. So the rotor faces may be well above 350 degre= es=20 as the oil temp is on the way up to temp. Oil temps may be worse as time (of= =20 each heat cycle) goes by as foaming adds air to the oil. Foamed oil picks up= =20 less heat from the rotors and releases less heat into the cooler. Not as big= a=20 problem for the NA engine. Big problem for the turbo engine.
 
Coolant temp out of control can crush the rotor housings. I would=20= work=20 on the water first.
Use a synthetic oil in the sump, and an OMP adaptor for 2 cycle oil in=20= the=20 housings. 
We use RedLine 40 Wt. racing oil in the sump and RedLine racing 2 cycle= in=20 a premix, but there are less expensive Synthetics.
 
Coolant is distilled water with 10% antifreeze and a bottle of Water-We= tter=20 and a 22 pound pressure cap.
 
Lynn E. Hanover
 
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