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1. 03:05 AM - Re: Propeller decision. (Naftali Horowitz)
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| Subject: | Propeller decision. |
Hi Lynn=2C
Did you hear about the french DUC Swirl ground adjustable? the X-Air is usi
ng it with the JAB 2200.
> From: lynnmatt@jps.net
> Subject: JabiruEngine-List: Propeller decision.
> Date: Mon=2C 16 Aug 2010 11:03:30 -0400
> To: jabiruengine-list@matronics.com
>
>
> I've been asking folks on the YahooJabiru group about ground-
> adjustable props=2C and came to a decision of sorts. Because some
> Jabiru owners don't go there=2C I thought I'd share some figures with
> this group=2C and maybe get some interest going about props=2C etc.
> Here's the post that I made at Yahoo Jabiru:
>
> *************************
> Thanks to all who offered suggestions regarding the ground adjustable
> prop. After reading and digesting the comments=2C and flying a couple
> of times with my chopped-down 55.5" x 46" wood prop=2C I think I've
> concluded that if I could match the performance of this bastardized
> prop with a fixed pitch prop of a normal shape (after cutting=2C the
> ends of my blades are blunt...no rounding-off was done)=2C I'd go with
> it. What I mean is=2C if I could get Sensenich to use the numbers that
> seem to give me good performance....the 55.5" x 46"....and make a
> prop of say=2C 62" x 40 or 42"=2C I'd do it. I'll call them and see
> what they suggest. This might be a good time to visit the Prince prop
> factory=2C as they are within 100 miles. I just don't like the 16-week
> wait=2C or the 16-days wait at 50% more money. : (
>
> The ground adjustable thing seems to be an area with problems=2C as far
> as the present is concerned=2C so I think I'll stay away from them.
>
> Here's the comparison between the 62x46 and the 55.5x46.....with the
> 62=2C I get about 2810-2840 rpm climbout (@ about 6.4 gph fuel flow)=2C
> and the 55.5 gives me 3000-3040 rpm=2C using 7.0 gph fuel flow.
> According to the fuel use=2C the higher rpm's are giving me more
> horsepower during climbout. I checked this morning=2C and my speed at
> WOT straight and level=2C going nearly across the wind (northbound) was
> 101 mph at 3210 rpm=2C and 123 mph at 3240 rpm going southbound. The
> wind was reported at 3000' to be 281=B0 @ 29 kts. So the shorter prop
> gives me the desired rpm's=2C but that's not the way to do it=2C
> according to the theories that I've read and heard.
>
> I only flew for a little while=2C but during that time=2C the fuel usage
> was comparable to what I've been seeing....around 2.9 to 3.2 gph
> (running lean of peak EGT)=2C but the rpm was higher. I saw no change
> in EGT's as a result of letting the rpm wind up a bit.
>
> **************************
>
> The reason for wanting a different prop came about after I flew into
> a moderately hard rain and it etched/blasted the leading edge of my
> prop pretty badly.
>
> Lynn Matteson
> Kitfox IV Speedster=2C taildragger
> Jabiru 2200=2C #2062
> Sensenich 62"x46" Wood (summer)
> Electroair direct-fire ignition system
> Rotec TBI-40 injection
> Status: flying...1040+ hrs (since 3-27-2006)
>
>
>
>
>
>
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