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Actually, Earnest, my last flight was with a total inlet area for both GM
cores of 28 sq inches. 10 sq inch inlet on the left and 18 on the right
inlet.
Did fine at cruise with oil and coolant around 165-170F. However, when I
pushed it to WOT at 7000 MSL oat 70F the temps climbed and stabilzed around
200F at 6300 rpm with a 11.28 GPH fuel burn. So while I feel comfortable
with anything 200F and below, I believe I will need to open up the coolant
intake to around 36 - 38 sq inches to take care of the additional power and
provide a margin for warmer OAT. Estimated HP was 123 HP at 7000. So if
that was close to 75% of my sea level then sea level would have been 164HP
or a bit shy of the 170 HP estimate.
I have previoulsy flow with a total of 48 sq inches for over 160 hours with
no cooling problems even on 95+ days other than the intial surge during
takeoff and climbout which on a 95F + day may get to 210F. However, that was
with pretty lossey ducts, I think the new ducts based on the streamline
coordinates are doing much better.
Ed
.
----- Original Message -----
From: <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, September 26, 2004 2:42 PM
Subject: [FlyRotary] Re: Still high temperature
>
>
> ----- Original Message -----
> From: Al Gietzen <ALVentures@cox.net>
> Date: Saturday, September 25, 2004 9:03 pm
> Subject: [FlyRotary] Re: Still high temperature
>
> >
> > My analysis of air flow required for 200 hp climb
> at 120 kts on a
> > 95F day,
> > and a very effective scoop is 65 sq.in. inlet area
> - just for the
> > coolantrads. Another 25 sq. in. inlet for the oil
> cooler. This is
> > more than
> > typically needed for cruise, but it's a tradeoff.
> >
>
> Al, how do you correlate your figures with Ed's
> results. I believe he has said that the estimates
> only 170Hp, but I don't think he could get away with
> half the the scoop area.
>
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html
>
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