REFLECTOR: Second flight

[steve korney]

Ruben...

That's good information.... Thanks for that...


Steve 

From: ruben at vainneg.com
To: geoff.gerhardt at gmail.com; reflector at tvbf.org
Date: Mon, 20 Aug 2012 12:05:19 -0400
Subject: Re: REFLECTOR: Second flight




















Geoff, 

 

Mine is a SE-FG with and IO-360. The
numbers you are giving here sound pretty much a similar experience I have. In
the last couple of years I have been back and forth with Catto, I have used 3
different props. Cruise, and Climb props ranging my static from 1,900 to
2,200rpm, and take of distance from 1,500ft to 2,500ft., climb rate from
300-500ft./m  to 700-1000ft.m and cruising from 130KTAS to 150KTAS.

 

The conclusion is that there has to be a
compromise, when you use a fix prop. You can get climb in sacrifice of speed or
speed in sacrifice of climb, but the good news is that last year Catto came our
with a new prop design. It looks much fatter than normal from the bottom than
the top, and also the blade is kind of twisted more aggressively than a normal
prop. With this design, the range of sacrifice between climb or cruise seems to
have been reduced a lot. 

 

I got one of these new designed props and it
improve my take of distance and climb rate without scarify almost any cruising,
maybe a couple of knots. My take off roll out can rage between 1,600 to 2,200
depending on temperature and weight. In a cold day by myself I can be in the
air pretty quick, in the summer and with full weight, I always count a minim
safe distance of 2,500 and if there are trees around, I aim for a minimum of
3,000ft runways. Climb again it depends a lot on temperature and weight. In the
 winter at full weight and climb at 700ft/ with no problem, in the summer and
full weight 300ft/m with DA of 4000’ is the max I can get making planning
for take off and important thing, but when I am up in the air at flat level I easily
get the 145Ktas cruising speed at 2450rpm. I guess with a retract you would get
at least 10 to 15 more than that.

 

Do you know what type of prop do you have?
The old one, or the new design?

 

Ruben G. Creus

Ë
+1.571.215.0025

* ruben at vainneg.com

 

 









From: Geoff Gerhardt
[mailto:geoff.gerhardt at gmail.com] 

Sent: Monday, August 20, 2012 7:50
AM

To: Velocity Aircraft Owners and Builders list

Subject: REFLECTOR: Second flight



 

Guys,



 





I spent Sunday morning fixing a few issues that were identified in the
first flight, then took her out for a second flight this afternoon.  I
think I'm going to have to send my prop back to Craig to have it re-pitched,
but I'd like to hear your input.  There's a link below to a post on my
website that shows the flight video as well as a CloudAhoy analysis (if you're
not familiar with CloudAhoy, its a very cool app for recording a flight).
 With just me on board and only ~20gal of fuel, I need ~2200' of runway to
lift off (DA 2000'), then I have to stay low to build up some speed to start my
climb.  Once I can get to 90-100kts, I can climb ok, but I feel a bit
unsure about flying into any 3000' runways with only 800' of wiggle room, particularly
if there's any trees past the runway.  My prop is currently 66x74.
 Have a look at the video and CloudAloft and let me know how this compares
to your experience with a fixed-pitch prop.





 





Here's a link to the post on my website that describes the second
flight and videos.





http://thegerhardts.com/velocity/?p=513






 





Geoff





 









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