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Date: Sat, 16 Sep 2006 01:59:17 -0500
From: David Staten <Dastaten@earthlink.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Improving oil cooling [was Flight test]
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We are going to use two oil coolers. Thats per plans by the Velocity 
Factory manual.

Dave

David Carter wrote:

> Al,
> I've had a 1970 VW Bus since Jan 1971. Enlarged original engine to 
> 1835cc, which generated more heat. I instrumented the engine with 
> Manifold Pressure gage, oil pressure, and oil temp.
> . . . I REPLACED the stock oil cooler "tower" with an adapter to take 
> the oil out of the engine to an external oil cooler - and added a 
> small (maybe 6" X 10") 5/8" thick aluminum finned oil cooler inside 
> the engine bay (think it was a small air conditioner device?) - hung 
> it from "ceiling" of engine compartment with coat hanger wire. It lay 
> horizontally, not perpendicular to any air coming down and over toward 
> fan housing opening near center of compartment.
> . . . Point is, no hope of any significant airflow - it was all 
> "convection" (rising heated air) and "surface area". It cooled just 
> fine (better than stock).
> This arrangement gave exellent cooling. That is point #1
> Point #2: I've heard others recommend, "If one stock Mazda oil cooler 
> doesn't cool enough, put in a 2nd." I don't have any anecdotes of 
> anyone doing that.
> . . . I do know that we are all "wired" to "think airflow", "ducts", etc.
> My hypothesis: Just put another Mazda oil cooler in-line with the 
> existing one - without any regard to ducting or orientation - just get 
> the extra cooler volume and cross section out somewhere (away from the 
> exhaust radiant heat), somewhere where it will fit, and let it 
> "radiate" and "convect" and I'll bet your temps will come down 10 to 
> 15 degrees - with no changes or mods to your ducting. That is what my 
> non-ducted, hanging in the bay, VW experience suggests.
> David
>
>     ----- Original Message -----
>     *From:* Al Gietzen <mailto:ALVentures@cox.net>
>     *To:* Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
>     *Sent:* Friday, September 15, 2006 12:08 PM
>     *Subject:* [FlyRotary] Flight test
>
>     Finally got the proper alignment of the planets (basically test
>     pilot schedule) for further flight of Velocity 755V – 20B. Plane
>     was in the air for ½ hour this time, basically at level cruise
>     orbiting the airport. OAT was about 90F and flight was at DA of
>     about 7000’.
>
>     Since the first flight when oil temps were high, I added a
>     temporary ram scoop under the ‘wing root’ oil cooler inlet. Oil
>     temp reached near 230 during climb but later stabilized at 200 -
>     205F. Coolant stabilized at 180-185F.
>
>     <snip>
>
>     Al
>