REFLECTOR: Second flight

[Dennis Martin]

Thanks for the details on your Catto, Ruben. Take offs are no problem,
butI'm having trouble getting enough speed at full throttle. I'll get back
after talking with Craig - maybe that new design prop is what I need.

Dennis

On Mon, Aug 20, 2012 at 10:05 AM, Ruben Creus <ruben at vainneg.com> wrote:

> **
>
> 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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-- 
All the best,
Dennis
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