Ke= n

Th= anks for the reply. Actually the = scoop will be supplying both the radiator and the oil cooler, so I may be a little = small by those figures. Ed had = sent me some CFM requirements earlier that seemed like I was in the ballpark = maybe, but I’m not sure how he calculated the CFM’s for the inlet = area.

St= eve

-----Original Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of kenpowell@comcast.net
Sent: Tuesday, July 13, = 2004 5:40 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] New = Scoop

Steve,<= /p>

As another data point we had a = pro cooling system engineer who did some calculations for Mike Wills. Fred = Morino calculated that for 160 HP at 180 MPH (I think this was the speed) that = we (RV'ers) would need a rad intake of ~50 sq inches and an oil cooler = intake of ~25 sq inches (does anyone still have Fred's results - I can't seem to = find where I filed this paper - I fear it is on a computer that I = junked). This always seemed a little large to me but you seem to be very close, = so this should be a good starting point for your tuning.<= /p>

Ken Powell<= /p>

-------------- Original message --------------

> Ed, and others -
>
> Attached are some photos of the new scoop I'm building to replace = my old new
> scoop. As you can see the new one actually has less intake area, = but
> extends further in order to get outside of the boundary layer.
>
> I don't want the intake any larger than it has to be, but I want to = make
> sure also that it is sufficient to allow for enough air flow. My = old new
> scoop did improve cooling, but as I found out, it was only = marginal.
>
> The new scoop, which is patterned after a P51 style scoop, not only = gets
> outside of the boundary layer air, but also excludes it, with the = dam that
> you see at the bottom. Well, actually it will be at the top, once = it is
> mounted under the belly. It also gives me an expansion area once = inside the
> scoop.
>
> Using the program that Al sent me, the boundary area calculated out = to about
> 1.625-1.75 inches +/- depending on speed.
>
> The scoop intake measures 10.75" inside at the top (narrowest) = and 14.75" at
> the widest point average =3D 12.75"
> Height of the inside of the scoop measures 4.25"
> This should equal about 54.18 sq in of area.
>
> The inside of the scoop sits exactly 2" from the bottom of the fuselage, and
> overall height to the outside of the scoop is about 6.6" = again, measured
> from the fuselage bottom.
>
> I haven't glassed the scoop yet, other than on one side to help = with gluing
> it together.
>
> I am interested in any feedback concerning the size of the intake = area.
>
> Regards,
>
> Steve Brooks
> Cozy MKIV N75CZ
> Turbo Rotary