Today's Message Index:
----------------------
1. 05:28 AM - Re: lurking lister (gary)
2. 07:03 AM - Re: lurking lister (Bill Morelli)
3. 02:55 PM - (no subject) (N53dw@aol.com)
4. 03:57 PM - Re: (no subject) (Bill Cardell)
5. 06:33 PM - prop balance (gary)
6. 07:35 PM - Re: lurking lister (RLucka@aol.com)
Message 1
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| Subject: | Re: lurking lister |
--> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
It might be a slight imbalance in the prop/spinner. Mine had very noticable
vibrations that were worse at certain rpm. After the dynamic balance, it's
like night and day but there are still some small vibrations at certain
rpm's.
Can you run without the prop and check? Mine was perfectly smooth without
the prop so I knew to chase the prop balance thing, especially with a
2-blade.
Gary
----- Original Message -----
From: <RLucka@aol.com>
Subject: Re: Stratus-List: lurking lister
> --> Stratus-List message posted by: RLucka@aol.com
>
> In a message dated 2/24/2004 5:45:13 PM Eastern Standard Time,
N53dw@aol.com
> writes:
> 5) Someone mentioned a while back shimming the prop blades inside the hub
> with tape trying to correct a tracking problem. I tried that, but it
seems
> to
> interfere with the clamp loads exerted by the hub bolts, and I could see
> fretting marks on the hub when I pulled it down for inspection. I removed
> the tape
> and it seems much more secure. Darryl at Warp Drive says blade tracking
> within 1/4" is acceptable anyway, because a modular prop is more tolerant
of
> an out
> of track condition than a solid one.
> It may have been me who mentioned that. I have a 70" Warp Drive for my
> Stratus Subaru. It so happened that there was (and still is) a tracking
difference
> of 1 mm between two blades and a maximum difference of 3 mm between two
other
> blades. 3 mm is within the 1/4" limit as specified by Warp Drive (I
called
> them and they told me about the 1/4" maximum deflection allowance).
>
> I used aluminum tape to try to bring the deflection to a minimum. It made
no
> difference in vibration or performance. Eventually, I noticed the tape
> breaking up and oozing out the hubs where the blades exit so I removed the
tapes
> and reinstalled the props. Still no difference.
>
> Weather is warming up so I am going to experiment with the carbs to try to
> get them to match up perfectly in the hope of removing some engine
vibration
> that always seem to be present at certain rpm's. For example, the engine
idles
> nice and smooth at 1,200 rpm, but as the engine speeds up from 1,400 rpm
to
> 2,000 rpm, there is a noticeable vibration. My theory is that one carb
may be
> transitioning from idle to middle sooner than the other, causing a
mismatch in
> fuel/air flow to both sides of the engine. This is just a theory that I
am
> going to try to confirm soon and hopefully be able to correct and have
total
> smoothness throughout the entire rpm range.
>
> Dick (601HDS, Stratus, 176 hours)
>
>
Message 2
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| Subject: | Re: lurking lister |
--> Stratus-List message posted by: "Bill Morelli" <billvt@together.net>
Gary,
What's involved getting the prop and spinner balanced? Is it expensive?
Bill
> [Original Message]
> From: gary <FlyinK@efortress.com>
> To: <stratus-list@matronics.com>
> Date: 2/25/2004 8:28:18 AM
> Subject: Re: Stratus-List: lurking lister
>
> --> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
>
> It might be a slight imbalance in the prop/spinner. Mine had very
noticable
> vibrations that were worse at certain rpm. After the dynamic balance,
it's
> like night and day but there are still some small vibrations at certain
> rpm's.
>
> Can you run without the prop and check? Mine was perfectly smooth without
> the prop so I knew to chase the prop balance thing, especially with a
> 2-blade.
>
> Gary
>
>
> ----- Original Message -----
> From: <RLucka@aol.com>
> To: <stratus-list@matronics.com>
> Subject: Re: Stratus-List: lurking lister
>
>
> > --> Stratus-List message posted by: RLucka@aol.com
> >
> > In a message dated 2/24/2004 5:45:13 PM Eastern Standard Time,
> N53dw@aol.com
> > writes:
> > 5) Someone mentioned a while back shimming the prop blades inside the
hub
> > with tape trying to correct a tracking problem. I tried that, but it
> seems
> > to
> > interfere with the clamp loads exerted by the hub bolts, and I could see
> > fretting marks on the hub when I pulled it down for inspection. I
removed
> > the tape
> > and it seems much more secure. Darryl at Warp Drive says blade tracking
> > within 1/4" is acceptable anyway, because a modular prop is more
tolerant
> of
> > an out
> > of track condition than a solid one.
> > It may have been me who mentioned that. I have a 70" Warp Drive for my
> > Stratus Subaru. It so happened that there was (and still is) a tracking
> difference
> > of 1 mm between two blades and a maximum difference of 3 mm between two
> other
> > blades. 3 mm is within the 1/4" limit as specified by Warp Drive (I
> called
> > them and they told me about the 1/4" maximum deflection allowance).
> >
> > I used aluminum tape to try to bring the deflection to a minimum. It
made
> no
> > difference in vibration or performance. Eventually, I noticed the tape
> > breaking up and oozing out the hubs where the blades exit so I removed
the
> tapes
> > and reinstalled the props. Still no difference.
> >
> > Weather is warming up so I am going to experiment with the carbs to try
to
> > get them to match up perfectly in the hope of removing some engine
> vibration
> > that always seem to be present at certain rpm's. For example, the
engine
> idles
> > nice and smooth at 1,200 rpm, but as the engine speeds up from 1,400 rpm
> to
> > 2,000 rpm, there is a noticeable vibration. My theory is that one carb
> may be
> > transitioning from idle to middle sooner than the other, causing a
> mismatch in
> > fuel/air flow to both sides of the engine. This is just a theory that I
> am
> > going to try to confirm soon and hopefully be able to correct and have
> total
> > smoothness throughout the entire rpm range.
> >
> > Dick (601HDS, Stratus, 176 hours)
> >
> >
>
>
Message 3
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--> Stratus-List message posted by: N53dw@aol.com
>>>Danny,
Lot's of good info, thanks. One question, why the concern with 70 psi of oil
pressure? That's a real typical number for water cooled engines. Just
wondering.
<<<<<<<<<<
I didn't have any experience with oil pressure that high, and I wanted to
keep it well in the green on everything. I'd hear you could spin a main if the
pressure was too high.
Message 4
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--> Stratus-List message posted by: Bill Cardell <bill@flyinmiata.com>
I'm wondering if that's a leftover from aircooled engines where oil
pressures will be lower due to the required higher clearances?
Bill Cardell (TurboDog's Dad)
bill@flyinmiata.com
Flyin' Miata
1-800-359-6957 (sales only)
970-242-3800 (tech support)
http://flyinmiata.com
http://flyinprotege.com
-----Original Message-----
From: N53dw@aol.com [mailto:N53dw@aol.com]
Subject: Stratus-List: (no subject)
--> Stratus-List message posted by: N53dw@aol.com
>>>Danny,
Lot's of good info, thanks. One question, why the concern with 70 psi of oil
pressure? That's a real typical number for water cooled engines. Just
wondering.
<<<<<<<<<<
I didn't have any experience with oil pressure that high, and I wanted to
keep it well in the green on everything. I'd hear you could spin a main if
the
pressure was too high.
Message 5
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--> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
probly not necessary for a 3-blade but i don't really know. anyway, i heard
it averaged around $200. I got mine for $120 and i would have paid double.
he put an accelerometer on the redrive which was cabled to a small box that
he had on his lap in the cockpit. he also put a strip of reflective tape on
the prop that was a reference for 0 degrees. we ran it up, he suggested
letting it sit at cruise rpm, and he hit a button which captured the
reading. it was .12 and he said that was already passing for a lyc. it
told him to add x grams at x degrees from 0 degrees. we grinded down some
AN washers until they were the right weight and put them on two prop bolts
(the degrees mark for the weights was between two prop bolts so he split the
weight between the two). we ran it again and got .04. he said he never saw
it go that low with one try and didn't think he could do much better so he
said to try it. it was night and day, really smooth now compared to the
vibration i had before. eggenfelner says his engines/props should get below
.04 so i might try again. the A&P usually takes 2 or 3 tries so maybe i can
get another one for free or cheap. i have a UHS spinner and someone else
found that theirs was off. i think the prop was good (i know it was
balanced) and the engine was really smooth without the prop/spinner. i also
made a squash plate for the prop so maybe that was off too but i think with
a 2-blade, everything adds up a little bit. just got back from a quick
flight after work and i love that thing, it's so smooth and the plane is
awesome.
gary
24.8 hours - gotta get going so i can make Sun'n'Fun (maybe)
----- Original Message -----
From: "Bill Morelli" <billvt@together.net>
Subject: Re: Stratus-List: lurking lister
> --> Stratus-List message posted by: "Bill Morelli" <billvt@together.net>
>
> Gary,
>
> What's involved getting the prop and spinner balanced? Is it expensive?
>
> Bill
>
>
> > [Original Message]
> > From: gary <FlyinK@efortress.com>
> > To: <stratus-list@matronics.com>
> > Date: 2/25/2004 8:28:18 AM
> > Subject: Re: Stratus-List: lurking lister
> >
> > --> Stratus-List message posted by: "gary" <FlyinK@Efortress.com>
> >
> > It might be a slight imbalance in the prop/spinner. Mine had very
> noticable
> > vibrations that were worse at certain rpm. After the dynamic balance,
> it's
> > like night and day but there are still some small vibrations at certain
> > rpm's.
> >
> > Can you run without the prop and check? Mine was perfectly smooth
without
> > the prop so I knew to chase the prop balance thing, especially with a
> > 2-blade.
> >
> > Gary
> >
> >
> > ----- Original Message -----
> > From: <RLucka@aol.com>
> > To: <stratus-list@matronics.com>
> > Subject: Re: Stratus-List: lurking lister
> >
> >
> > > --> Stratus-List message posted by: RLucka@aol.com
> > >
> > > In a message dated 2/24/2004 5:45:13 PM Eastern Standard Time,
> > N53dw@aol.com
> > > writes:
> > > 5) Someone mentioned a while back shimming the prop blades inside the
> hub
> > > with tape trying to correct a tracking problem. I tried that, but it
> > seems
> > > to
> > > interfere with the clamp loads exerted by the hub bolts, and I could
see
> > > fretting marks on the hub when I pulled it down for inspection. I
> removed
> > > the tape
> > > and it seems much more secure. Darryl at Warp Drive says blade
tracking
> > > within 1/4" is acceptable anyway, because a modular prop is more
> tolerant
> > of
> > > an out
> > > of track condition than a solid one.
> > > It may have been me who mentioned that. I have a 70" Warp Drive for
my
> > > Stratus Subaru. It so happened that there was (and still is) a
tracking
> > difference
> > > of 1 mm between two blades and a maximum difference of 3 mm between
two
> > other
> > > blades. 3 mm is within the 1/4" limit as specified by Warp Drive (I
> > called
> > > them and they told me about the 1/4" maximum deflection allowance).
> > >
> > > I used aluminum tape to try to bring the deflection to a minimum. It
> made
> > no
> > > difference in vibration or performance. Eventually, I noticed the
tape
> > > breaking up and oozing out the hubs where the blades exit so I removed
> the
> > tapes
> > > and reinstalled the props. Still no difference.
> > >
> > > Weather is warming up so I am going to experiment with the carbs to
try
> to
> > > get them to match up perfectly in the hope of removing some engine
> > vibration
> > > that always seem to be present at certain rpm's. For example, the
> engine
> > idles
> > > nice and smooth at 1,200 rpm, but as the engine speeds up from 1,400
rpm
> > to
> > > 2,000 rpm, there is a noticeable vibration. My theory is that one
carb
> > may be
> > > transitioning from idle to middle sooner than the other, causing a
> > mismatch in
> > > fuel/air flow to both sides of the engine. This is just a theory that
I
> > am
> > > going to try to confirm soon and hopefully be able to correct and have
> > total
> > > smoothness throughout the entire rpm range.
> > >
> > > Dick (601HDS, Stratus, 176 hours)
> > >
> > >
> >
> >
>
>
Message 6
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| Subject: | Re: lurking lister |
--> Stratus-List message posted by: RLucka@aol.com
In a message dated 2/25/2004 8:29:10 AM Eastern Standard Time,
FlyinK@efortress.com writes:
Can you run without the prop and check?
Yes, I once ran the engine without the prop and found the same vibrations at
the same affected rpm's, but not as much (the props seem to magnify the
vibrations). That is what led me to think the carbs need balancing.
How do you do the dynamic balancing on the props?
Dick (601HDS, Stratus)
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