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1. 06:55 AM - Re: RV4-List Digest: 7 Msgs - 08/19/05 (rob ray)
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| Subject: | Re: RV4-List Digest: 7 Msgs - 08/19/05 |
--> RV4-List message posted by: rob ray <smokyray@yahoo.com>
Pete, Steve, Jim,
I put a Mark Landoll Harmonic Dampener on my RV4 way back when I had a Sterba
prop on mine in 96'. I have left it on with every prop that I have had on with
no "bad vibrations" noted, ever. My Catto is a 2 blade which may have a difference
as well. It is filled with silicone fluid and is simply like a race car
clutch balancer and takes a few hours to "smooth out" while the fluid moves around
to dampen. It really helps with aft CG problems and gives more intertia
to wood props as it weighs 10 lbs.
Jim Ayers is right though, The MT is a wonderful prop. My nextdoor neighbor
has a 200HP RV8 with a 3 blade MT I fly frequently. Very smooth, great climb and
absolute "total" performance without alot of extra weight. Someday, I will
have one...
RR
RV4-List Digest Server <rv4-list-digest@matronics.com> wrote:
*
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Total Messages Posted Fri 08/19/05: 7
Today's Message Index:
----------------------
1. 06:24 AM - Re: Prop (PGLong@aol.com)
2. 06:54 AM - Re: Prop (rob ray)
3. 08:47 AM - Re: Prop (LessDragProd@aol.com)
4. 11:23 AM - Composite Props on RV-4 (Pete Waters)
5. 01:14 PM - Re: Composite Props on RV-4 (Charlie England)
6. 03:15 PM - Re: 020 empenage skins (Tim)
7. 04:41 PM - Re: Composite Props on RV-4 (Steve Schlieper)
________________________________ Message 1 _____________________________________
Time: 06:24:59 AM PST US
From: PGLong@aol.com
Subject: Re: RV4-List: Prop
--> RV4-List message posted by: PGLong@aol.com
On my 0-320-B2A in my RV-4, I recently installed (15 hrs ago) a Catto three
blade composite in place of several wood two blade props I had tried. I love
it. It is very smooth and I expect I'll never try anything else except maybe
a C. S. on my next RV............
Pat Long
PGLong@aol.com
N120PL
RV4
Bay City, Michigan
3CM
________________________________ Message 2 _____________________________________
Time: 06:54:43 AM PST US
From: rob ray
Subject: Re: RV4-List: Prop
--> RV4-List message posted by: rob ray
Pat, Donna;
I have tried 5 props on my RV4 and settled with two winners. My primary with my
new 0-320 D1A with 9.6:1 compression and 170HP is a Gary Hertzler wood/composite
2 blade prop.Gary makes props for Long EZ's and I was his first RV prop. It
works great and gets it's performance at lower RPM's. My former prop was a
Craig Catto wood composite 2 blade which reached it's peak at higher RPM, per
my request when constructed by Craig. I also ran a Margie Warnke "Claw" (best
ever). The Claw is a bit more suseptible to damage though and Margie has retired.
The Hertzler and Catto props are strong, light and give me the best performance
I have experienced with the HP available. My Catto will carry on bolted
to my Dad's new 160HP RV6!
Craig's website is www.cattoprops.com and Gary can be reached at Hertzler@yahoo.com
Good luck!
Rob Ray
PGLong@aol.com wrote:
--> RV4-List message posted by: PGLong@aol.com
On my 0-320-B2A in my RV-4, I recently installed (15 hrs ago) a Catto three
blade composite in place of several wood two blade props I had tried. I love
it. It is very smooth and I expect I'll never try anything else except maybe
a C. S. on my next RV............
Pat Long
PGLong@aol.com
N120PL
RV4
Bay City, Michigan
3CM
---------------------------------
________________________________ Message 3 _____________________________________
Time: 08:47:45 AM PST US
From: LessDragProd@aol.com
Subject: Re: RV4-List: Prop
--> RV4-List message posted by: LessDragProd@aol.com
Shame on you, Rob. You still haven't tried the MT 3 blade electric CS
propeller. :-)
Regards,
Jim Ayers
RV-3 N47RV LOM M332A engine & MT electric CS 3 blade propeller
In a message dated 08/19/2005 6:55:23 AM Pacific Daylight Time,
smokyray@yahoo.com writes:
--> RV4-List message posted by: rob ray
Pat, Donna;
I have tried 5 props on my RV4 and settled with two winners. My primary with
my new 0-320 D1A with 9.6:1 compression and 170HP is a Gary Hertzler
wood/composite 2 blade prop.Gary makes props for Long EZ's and I was his first
RV
prop. It works great and gets it's performance at lower RPM's. My former prop
was a Craig Catto wood composite 2 blade which reached it's peak at higher
RPM, per my request when constructed by Craig. I also ran a Margie Warnke
"Claw" (best ever). The Claw is a bit more suseptible to damage though and Margie
has retired. The Hertzler and Catto props are strong, light and give me the
best performance I have experienced with the HP available. My Catto will
carry on bolted to my Dad's new 160HP RV6!
Craig's website is www.cattoprops.com and Gary can be reached at
Hertzler@yahoo.com
Good luck!
Rob Ray
________________________________ Message 4 _____________________________________
Time: 11:23:50 AM PST US
From: Pete Waters
Subject: RV4-List: Composite Props on RV-4
--> RV4-List message posted by: Pete Waters
RV-4-List and SoCal Listers,
Pete "Pedro" Waters here with some observations, and questions.
I have a 3-bladed Catto on the 180HP RV-4 I bought with ~750 hours on it. The
prop seems to do the trick of pulling the airplane around, but I notice that
at low /idle RPM the front end of the airplane gets what I would almost describe
as a shimmy. By "low/idle RPM" I mean about 800 RPM on deck and around 1100
RPM inflight -- a difference I attribute to the prop windmilling in flight,
so that the airstream is driving the engine somewhat. The shimmy disappears
above about 800 RPM on deck and 1100 RPM in flight.
I'm wondering if this is due to the fact that the prop is fairly light, which
implies that when it's spinning slowly, the prop disc doesn't have enough inertia
to smooth out the power pulses of the O-360 as the cylinders fire. If so,
I'm thinking that side-to-side this effect would not be doing my crankshaft
a lot of good. (Craig Catto specifically designed this prop for this engine /
airframe combination, but still, I wonder.)
Or, it could just be an engine / airframe / prop resonance that's unique to my
particular installation.
Smoky, did you ever see anything like this on your RV-4 (O-320 if I remember
correctly) when you had the Catto installed? Has anybody else with a light prop
on a big engine seen anything like this?
Thanks,
Pedro
RV-4 N562PW
900 Hours (not all of it mine)
---------------------------------
________________________________ Message 5 _____________________________________
Time: 01:14:58 PM PST US
From: Charlie England
Subject: Re: RV4-List: Composite Props on RV-4
--> RV4-List message posted by: Charlie England
Pete Waters wrote:
>--> RV4-List message posted by: Pete Waters
>
>RV-4-List and SoCal Listers,
>
> Pete "Pedro" Waters here with some observations, and questions.
> I have a 3-bladed Catto on the 180HP RV-4 I bought with ~750 hours on it. The
prop seems to do the trick of pulling the airplane around, but I notice that
at low /idle RPM the front end of the airplane gets what I would almost describe
as a shimmy. By "low/idle RPM" I mean about 800 RPM on deck and around 1100
RPM inflight -- a difference I attribute to the prop windmilling in flight,
so that the airstream is driving the engine somewhat. The shimmy disappears
above about 800 RPM on deck and 1100 RPM in flight.
> I'm wondering if this is due to the fact that the prop is fairly light, which
implies that when it's spinning slowly, the prop disc doesn't have enough inertia
to smooth out the power pulses of the O-360 as the cylinders fire. If so,
I'm thinking that side-to-side this effect would not be doing my crankshaft
a lot of good. (Craig Catto specifically designed this prop for this engine
/ airframe combination, but still, I wonder.)
> Or, it could just be an engine / airframe / prop resonance that's unique to
my particular installation.
> Smoky, did you ever see anything like this on your RV-4 (O-320 if I remember
correctly) when you had the Catto installed? Has anybody else with a light prop
on a big engine seen anything like this?
>
>Thanks,
>Pedro
>
>RV-4 N562PW
>900 Hours (not all of it mine)
>
Assuming it's a 4 cyl Lyc, then what you've got is a 4 cyl Lyc. Welcome
to 'aircraft quality'.
Charlie
4 cyl Lyc powered RV-4
________________________________ Message 6 _____________________________________
Time: 03:15:10 PM PST US
From: "Tim"
Subject: Re: RV4-List: 020 empenage skins
--> RV4-List message posted by: "Tim"
Rob,
As far as your wish list, why the .040 forward fuse skins?
Thanks,
Tim
----- Original Message -----
Wish list: If I had it to do over I would have .020 tail feathers and 040 forward
fuselage skins all the way back to the 1st aft bulkhead (HRII), RV6 wing
tanks or the Hotel Whiskey tanks, hopped up 160HP by LyCon and Aerocomposites
C/S prop, shear wingtips, pre-preg cowling...etc.
OK, mine still isn't bad like it is, stock and light, 175HP 0-320, wood/composite
FP prop and 950# lbs empty. Hindsight is always 20/20...
Rob Ray
________________________________ Message 7 _____________________________________
Time: 04:41:10 PM PST US
From: "Steve Schlieper"
Subject: Re: RV4-List: Composite Props on RV-4
--> RV4-List message posted by: "Steve Schlieper"
Pete,
No experience with Catto props but the outfit on my bird (I recently bought
it in June) is a Sterba 68 length 74 pitch coupled to an inertial flywheel
in front of the 0320H2D. The builder told me that this is the preferred set
up with a light prop arrangement. Works slick. Very smooth. In fact, apart
from engine noise you'd swear that you were flying a glider.
Steve Schlieper
N16FB
----- Original Message -----
From: "Pete Waters"
Subject: RV4-List: Composite Props on RV-4
> --> RV4-List message posted by: Pete Waters
>
> RV-4-List and SoCal Listers,
>
> Pete "Pedro" Waters here with some observations, and questions.
> I have a 3-bladed Catto on the 180HP RV-4 I bought with ~750 hours on it.
> The prop seems to do the trick of pulling the airplane around, but I
> notice that at low /idle RPM the front end of the airplane gets what I
> would almost describe as a shimmy. By "low/idle RPM" I mean about 800 RPM
> on deck and around 1100 RPM inflight -- a difference I attribute to the
> prop windmilling in flight, so that the airstream is driving the engine
> somewhat. The shimmy disappears above about 800 RPM on deck and 1100 RPM
> in flight.
> I'm wondering if this is due to the fact that the prop is fairly light,
> which implies that when it's spinning slowly, the prop disc doesn't have
> enough inertia to smooth out the power pulses of the O-360 as the
> cylinders fire. If so, I'm thinking that side-to-side this effect would
> not be doing my crankshaft a lot of good. (Craig Catto specifically
> designed this prop for this engine / airframe combination, but still, I
> wonder.)
> Or, it could just be an engine / airframe / prop resonance that's unique
> to my particular installation.
> Smoky, did you ever see anything like this on your RV-4 (O-320 if I
> remember correctly) when you had the Catto installed? Has anybody else
> with a light prop on a big engine seen anything like this?
>
> Thanks,
> Pedro
>
> RV-4 N562PW
> 900 Hours (not all of it mine)
>
>
> ---------------------------------
>
>
>
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