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Subject: On the step
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Date: Mon, 9 Jul 2012 12:42:30 -0400 (EDT)
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I commented on here recently about how I took a cross- country flight to Wa=
lla Walla from Everett, Wa recently and was only seeing 140-150 mph cruise =
at 11,500 feet. It got me to thinking- I was getting about 6200 rpm on the =
engine which is 2175 at the prop. So, I'm a little overpropped/ underpowere=
d.=20

So, there's the old chestnut about how you can get a few more knots from an=
 airplane in cruise if you go a little above your cruise altitude and then =
descend to your cruise altitude, thereby getting "on the step" . Some pilot=
s swear by this, others dismiss it. I have a theory- if I climb to a cruise=
 altitude and stay at full throttle while doing so, I will only get the eng=
ine to run up to a certain RPM and therefore a certain hp will be achieved,=
 and no more and so the airplane will settle into an equilibrium at a certa=
in speed- say at whatever hp/speed - 140 mph at 6200 rpm- lt's say x hp.=20

Now, If I were to descend to my cruise altitude in a shallow dive, I will b=
e acheiving a higher rpm and hence horsepower, say 6800 rpm and horsepower =
will be x + 9%x for a hp of 109% of the hp achieved at 6200 rpm, so I shoul=
d be able to achieve and maintain a higher cruise  speed if I descend to my=
 cruising altitude. ( I picked 9% arbitrarily for the sake of argument) .

Anyone want to shoot me down on this one?

This is just an theory, If I want to go faster first I have to clean up my =
drag. My cooling scoop is effective, but obviously draggy. And It needs a f=
lap on it. That's a project for this winter.=20

Brian Trubee

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<font color=3D'black' size=3D'2' face=3D'arial'>
<div><FONT style=3D"BACKGROUND-COLOR: transparent" face=3D"Arial, Helvetica=
, sans-serif">I commented on here recently about how I took a cross- countr=
y flight to Walla Walla from Everett, Wa recently and was only seeing 140-1=
50 mph cruise at 11,500 feet. It got me to thinking- I was getting about 62=
00 rpm on the engine which is 2175 at the prop. So, I'm a little overproppe=
d/ underpowered. </FONT></div>


<div>&nbsp;</div>


<div>So, there's the old chestnut about how you can get a few more knots fr=
om an airplane in cruise if you go a little above your cruise altitude and =
then descend to your cruise altitude, thereby getting "on the step" . Some =
pilots swear by this, others dismiss it. I have a theory- if I climb to a c=
ruise altitude and stay at full throttle while doing so, I will only get th=
e engine to run up to a certain RPM and therefore a certain hp will be achi=
eved, and no more and so the airplane will settle into an equilibrium at a =
certain speed- say at whatever hp/speed - 140 mph at 6200 rpm- lt's say x h=
p. </div>


<div>&nbsp;</div>


<div>Now, If I were to descend to my cruise altitude in a shallow dive, I w=
ill be acheiving a higher rpm and hence horsepower, say 6800 rpm and horsep=
ower will be x + 9%x for a hp of 109% of the hp achieved at 6200 rpm, so I =
should be able to achieve and maintain a higher cruise&nbsp; speed if I des=
cend to my cruising altitude. ( I picked 9% arbitrarily for the sake of arg=
ument) .</div>


<div>&nbsp;</div>


<div>Anyone want to shoot me down on this one?</div>


<div>&nbsp;</div>


<div>This is just an theory, If I want to go faster first I have to clean u=
p my drag. My cooling scoop is effective, but obviously draggy. And It need=
s a flap on it. That's a project for this winter. </div>


<div>&nbsp;</div>


<div>Brian Trubee</div>
</font>
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