<<While I had my lower cowling off to give it bigger nostrils up front for
better cooling>>
You don't need to do that.
Rather, the inlet coeff. of the nostrils can be improved by reprofiling the
edge of the hole.
My oil cooler is mounted behind one of the XS nostrils (with a shroud
between the nostril and the cooler). In this situation the oil overcools, so
the 3" hole was throttled back with an insert that provides a generously
rolled edge and a 2" diameter venturi immediately behind the aperture.
Result was absolutely no difference, despite the area of the inlet now
being about half.
A Mk 2 version was then made with a 1.5" diameter, which did then reduce
airflow and allow reasonable oil temps in winter.
Duncan Mcf.
----- Original Message -----
From: "Steve Hagar" <hagargs@earthlink.net>
Subject: *** SPAM *** Europa-List: 914 Filter & Oshkosh
>
> While I had my lower cowling off to give it bigger nostrils up front for
> better cooling I took note how nice it would be to have a feature inside
> to register against the end of the air filter. I haven't started the
> motor yet but have noticed that the filter attachment could be
> problematic. I have had it loosen up after sitting for months in the
> garage. No doubt some sort of creep or flow going on with the material.
> Now if the lower cowling had a flat surfaced feature to butt against the
> end of the air filter the clamp would only have to suffice for a seal and
> not as an attachment device for a cantilever. Has anyone done this yet?
> If you have found an elegant way to get the right dimension give me a
> heads up. If I don't hear from anyone I'll have to go to my old standby
> for figuring it out. I do my best thinnking on this type of issue by
> wandering up and down the aisles of Home Depot. Looking at all the stuff
> on the shelves and racks eventually sets the lighbulb off
> on how to custom fab something. I have made some very passable outrigger /
> landing light fairing molds out of adhesive backed foam and electrical
> tape gathered on my wanderings.
>
> The trip out to Oshkosh and back in E. Trombley's Europa reconfirmed that
> I made a good decision to go with the Europa and also to go for the 914.
> The seating was more comfortable than my car (I'm 6 ft, 200#) my back
> gets stiff in the car, I was not stiff after 4 hr legs in the plane. My
> seats were modeled after Erich's after he sent me some photos. With the
> wing leveler turned on we could have slept most of the way home. Weather
> was bad on the way there had to fly real low and had to watch out for
> nasty stuff like real tall TV towers rising terrain etc. The engine
> hummed like a sewing machine all trip. We probably could have done it in
> a day if the weather was good and got a real early start.
>
> The turbo adds a startling amount of versatility, on the the trip back
> home we were at 6500 ft. indicating 120 kts airspeed and 80 kts gps ground
> speed. We elevatored up to 14500 ft. looking for more favorable winds
> and eventually found a spot where we got about 130 kts groundspeed. Going
> over the Rockies was just a short jump. All this on about a 5 gal/hr
> burn rate, with a fixed pitch prop and with the outriggers down.
> (electrically actuated that fold completely inboard into the wing but
> left down because of burned out motor).
>
> The trip was just what I needed to get kicked in gear to finish N40SH.
> Perhaps it will be ready to fly to Sun n Fun in primer?
>
> Steve Hagar
> Mesa, AZ
>
>
> Steve Hagar
> hagargs@earthlink.net
>
>
>
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