On Wed, 10 May 2006 07:31:17 -0700
"Al Gietzen" <ALVentures@cox.net> wrote:

> Good News:  Velocity N755V received FAA airworthiness certification
> yesterday.  Also survived an intensive 4-hr inspection by a factory
> authorized insurance inspector with a small list of minor items to attend
> to.
>
>  
>
> Not So Good News:  Main issue now seems to be cooling during ground
> operations, particularly oil cooling, and the secondary temporary issue of
> mixture reprogramming (again, after software update).  With the wing root
> cooler in a pusher configuration there is almost no oil cooling when
> standing still.  So running at significant power to adjust mixture allows
> little time to do anything before reaching temp limits. Then, with cowl on,
> it takes hours for it to cool down.
>
>  
>
> My expectation was for enough natural convection cooling on the ground to
> handle low power taxi operations.  Earlier static running suggested that
> there would be sufficient time, but I'm finding that; a) taxi maneuvering
> with brake steering takes more power than anticipated, and b) the 3" thick,
> 16 fins/in. oil cooler core has almost no natural-convection cooling. Have
> no good ideas at the moment how to improve this situation.  Haven't gotten
> to high speed taxi yet to see if temps stabilize.
>
>  
>
> Tracy; can you tell me the basics of your water spray system?
>
>  
>
> The in-cowl coolant rad gets reasonable air flow because of negative
> pressure generated by the prop aft of the cowl.
>
>  
>
> More later,
>
>  
>
> Al
>

Congratulations Al.  I'm glad to hear you got your paperwork.  Can you
set up a blower to provide oil cooling until you get your mixture tuned
in?

Bob W. (Back to the airport for MORE fiberglass work.)

--
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