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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2095362@logan.com>
Subject: Re: [FlyRotary] RV-7A cooling - continued
Date: Sun, 10 Jun 2007 19:25:39 -0400
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Hi Dennis,

It sounds like you have a good handle on the cooling.  From what I see in 
your data, your coolant temps are golden for a 90F OAT day.  Your oil on the 
other hand could stand a bit of improvement.  Noticing the configuration of 
your oil cooler, have you considered dividing your duct into vertical 
sections such that a bit more air is directed to the oil cooler?  I would 
like to see the oil temps come down to around 200F even if your coolant went 
up a bit.


Your photo did not come through, so try again.  I would like to see the 
insert.

Ed


----- Original Message ----- 
From: "Dennis Haverlah" <clouduster@austin.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, June 10, 2007 6:56 PM
Subject: [FlyRotary] RV-7A cooling - continued


> I've improved my cooling quite a bit by installing an insert in the bottom 
> of the cowl to direct air up and into the oil and water radiators.  This 
> took the place of  the vanes I had installed first.  Attached is a picture 
> taken looking into the air inlet duct showing the foam insert in the lower 
> cowl/duct.  My last flight at  90 deg. OAT my oil went to 212 and the 
> water went to 199 F.   This was at about 5200 rpm, 23 in. mp and 115 kts. 
> My oil pressure was 65 psi.  I'm using Castrol Synthetic 10W-30.  On 
> start-up my oil will go to 85 psi max. From tests I've run, I now have 
> more flow through the first 40 % of the radiators and less  flow through 
> the rear 60 %.   I probably need to change the wedge shape to increase 
> flow to the back of the radiators.  I'd like to review the document  by 
> Kays and London that covers design of a wedge.  Does anyone have 
> information on how I can get this document?   Also does anyone know if the 
> inner combustion "O" rings used in the Renesis engines are Teflon 
> encapsulated from the factory?  I
>
> Thanks,
> Dennis H.
>
> --
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