If you consider the fact that you need more power or a longer ground run to
take off at high temps or lower pressures (higher density altitude)
then Don's assertions are correct. Consider also that some aircraft were
supercharged during world war 2 only to delay the onset of "coffin corner"
and allow for a higher service ceiling. Well thats my 2 cents worth.
Craig
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of Remi Guerner
Sent: Wednesday, 30 January 2008 6:12 PM
To: Europa-List Digest Server
Subject: Europa-List: Don Dykins book
Hi all,
I have just read Don Dykins book Understanding the aerodynamics of your
Europa aircraft and I am puzzled by what I read in the Prototype flight
test performance section.
Figure 1 on page 15 shows that you need more power to fly at a given
airspeed at altitude than at sea level. I first thought it was a typo, but
page 18 confirms this assertion: more HP is required to fly at a given
speed at 10,000ft than at sea level.
The typical light aircraft cruises about 5 to 10 percent faster at 10000
ft than at sea level using the same power, and you can verify this with your
own Europa as well.
So Don Dykins is wrong. Unless he is talking about indicated airspeed. In
that case, talking about performance, this is nonsense.
I cannot believe someone who has contributed to the design of such a
wonderful aircraft can be so wrong. Am I missing something?
Please comment.
Remi Guerner
10:20 PM
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