Today's Message Index:
----------------------
1. 03:33 AM - Propeller question (Dave G)
2. 06:11 AM - Re: aux fuel pump (Harold McConnell)
3. 06:52 AM - Re: Re: Propeller (Glenn Horne)
4. 08:25 AM - Re: Re: Propeller (Pete Christensen)
5. 10:10 AM - Re: Propeller question (Guy Buchanan)
6. 12:22 PM - Re: Propeller question (Roger Lee)
Message 1
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| Subject: | Propeller question |
All this propeller talk is appropriate timing for me, I have a 68" taper tip
warp on a 3:1 C box on my 582. I was amazed at how much pitch I had to put
in to keep it from overspeeding. I get what I measure to be 14.5 deg. am I
measuring incorrectly or is this about right. Is there a table somewhere of
what to expect when you do this?
It was amazing to watch the egt's drop as I homed in my target RPM. Now
measuring just short of 1000 on a very hot day.
Message 2
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| Subject: | RE: aux fuel pump |
Thank you all for the input on my question about using an aux. fuel pump on my
582. Although some of you are using a 912 engine, the info you related is still
interesting and useful. My main reason for using an aux. pump is for cold
starting so I am trying to keep it as simple as possible for obvious reasons.
Thanks for your input.
Harold McConnell
NE North Dakota
KF3, 582, C box (3:1) with IVO 2 blade medium
Message 3
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Thanks Paul,
Already got one. Sorry.
GLENN
Kitfox _Sed" <prsedlac@gmail.com>
Sent: Wednesday, September 01, 2010 9:53 PM
Subject: Kitfox-List: Re: Propeller
>
> Glenn,
>
> I've got a 66" 3 blade GSC ground adjustable available. I got it with my
> Model III with B gearbox. It's never been run and is in great shape.
>
> -- Paul S
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=311026#311026
>
>
>
Message 4
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Glen,
I'd be careful using a GSC prop if it is very old. The have an "age
date" as well as hours in service limit. I had the following experience
a couple years ago on a prop that to this day looks like it was never
used. Date 4/5/2008.
"Dear friends,
Well it turns out I'm lucky to be alive. I was late leaving Buckeye,
AZ and flew more that 6 hrs yesterday and had to land in Deming,
NM because sun was about to set. This morning while doing a walk around
on my Kitfox III ,before the final leg home, I found that the blades
were loose (3 blade ground adjustable GSC prop). One blade was so
loose I turned it by hand. It had an annual the day I bought by a
Phoenix Kitfox guru. I suspect it must have been loose when I left AZ
but I never checked as it was not on my checklist. Of course my
instructor always had me check the 172's prop when I was getting my
bi-annual but I did not think to do that since the motor on the Kitfox
had not been run since the annual 4 days earlier.
What saved my life, I am sure, is that the prop was overpitched and all
I could get was 4200 rpm. The Rotax 912 is supposed to get better than
5500 rpm and has a gear reduction. Because I am such a skilled pilot,
(read stupid) I accepted the performance reduction in the interest of
getting home. I'm sure that if the prop had turned up to 5500 rpm I
would not need an aircraft in order to fly. Well assuming I made it to
heaven.
Thank the Good Lord for looking after us fools."
Pete
On 9/1/2010 8:53 PM, Kitfox_Sed wrote:
> --> Kitfox-List message posted by: "Kitfox_Sed"<prsedlac@gmail.com>
>
> Glenn,
>
> I've got a 66" 3 blade GSC ground adjustable available. I got it with my Model
III with B gearbox. It's never been run and is in great shape.
>
> -- Paul S
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=311026#311026
>
>
Message 5
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| Subject: | Re: Propeller question |
At 03:27 AM 9/2/2010, you wrote:
>I was amazed at how much pitch I had to put in to keep it from
>overspeeding. I get what I measure to be 14.5 deg. am I measuring
>incorrectly or is this about right. Is there a table somewhere of
>what to expect when you do this?
Well, it is what it is, right? That's the beauty of ground
adjustable. I run about 12 1/2 degrees on a 70" for a similar
configuration, but the pitch will vary considerably depending on your
weight, drag, density altitude, jetting, disposition, and just about
anything else you can think of. That's why you won't find any tables
or other "useful" information.
Guy Buchanan
San Diego, CA
K-IV 1200 / 582-C / Warp / 500 hrs. and counting
Message 6
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| Subject: | Re: Propeller question |
Guy is absolutely right. Don't ever worry about your actual numbers on pitch angle.
Just worry about rpm, temps and performance that you want. Each prop will
will be different from different Mfg's. Your plane's flight characteristics
from Mfg to Mfg will make it slightly different , too. So set it where your WOT
should be, watch your temps because prop pitch will make a difference and the
outside make up of your plane will factor into all this as far as proper pitch
for the prop.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=311111#311111
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