Wouldn't the official race speeds already be corrected?
From: Mike Perry
Sent: Wednesday, November 10, 2010 4:55 PM
Subject: [Q-LIST] Density Altitude, Q200 Speed
Mike, I still don't see how you get a correction of 17 mph. If you use
QACs chart of speed vs. altitude (newsletter 20) a density altitude of
6000 ft gives you a speed correction less than 10 mph. DA of 3000 ft
gives a correction of about 5 mph. Those corrections would move
Malechek's speed up close to 220 (QACs claimed top speed) but they don't
give you 230-240.
Am I missing something? Is there some other way of correcting the speed?
Sam, If it was a standing start then I am truly amazed, and possibly 230
is achievable. Anyone want to do a speed run in Death Valley below sea
level on a cold winter morning?
On 11/9/2010 5:32 PM, Mike Dwyer wrote:
Yup, March in FL is about 80F, 60 F dew point, and they're probably
1000' feet up.
That gets you a density altitude of 2800' here in FL!
Mike Q200 N3QP
Mike Perry wrote:
You are the engineer, but I don't get it. Sun & Fun is about 150 ft
elevation, Guys who are racing usually fly as low as possible unless
wind is a big issue (I think this was a triangular course so hard to
think they flew high). Was the temp that high?
I see what you mean about correcting to standard conditions, but do you
really think that gets you 17 mph from race conditions?
On 11/9/2010 3:36 PM, Mike Dwyer wrote:
But... these are actual speeds. By the book the max speed for a
normally aspirated engine is at sea level, 29.92 inches pressure
altitude, and 59F. If you took that 213 mph and calculated it to
"standard" he would probably be doing 230+?
Sam Hoskins wrote:
At the 1999 Sun 'n Fun 100 mile race, Bob Malechek turned 212.99 mphin his
Tom Moore was right behind him at 205.27 mph. I was behind Tom at
This was my very first race and I hadn't fully grasped the need to fly
on-course. This is also the race where I asked Bob the now legendary
question "What throttle setting do you fly at?"
These are the fastest times that I know are documented.