Al,

It was IAS and 10 may be slightly high too.  It was probably more like 5 kts, but still noticeable.

 

Steve

 

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Al Gietzen
Sent: Friday, July 16, 2004 5:06 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 11th test flight

 

 

The bad news is that the scoop appears to be costing me about 10 kts, which

I was expecting.  I also don't have any wheel pants yet on the main gear, so

it's not like I'm out to win any speed test at this point anyways.  My oil

continues to run higher than the coolant which indicates to me that I need

to do some more baffling to divert more air to the oil cooler.

 

Steve;

Are you comparing TAS or IAS? I suggest that there may be other reasons as well for the apparent 10 kt decrease in speed.  Just as speed increases at as the cube root of hp, so does it decrease as the cube root of drag.  That much decrease would suggest more than 20-25% increase in total drag, induced plus parasitic; more than could be expected from the change in scoop.

 

FWIW,

 

Al