Today's Message Index:
----------------------
1. 02:33 PM - Re: Sensenich propellors (Johnny Johnson)
2. 07:59 PM - Re: Sensenich propellors (rob ray)
3. 08:14 PM - Re: Sensenich propellors (Arvil)
Message 1
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| Subject: | Sensenich propellors |
--> RV3-List message posted by: "Johnny Johnson" <Johnny@wiktel.com>
If a person is going to have a fixed-pitch prop, I would feel comfortable
recommending the Sensenich... the 2600 rpm limit on the O320 prop is a bit
of a bummer tho. I have not flown a wooden prop on this--or any other
fast--airplane so don't know how wood compares in performance & smoothness.
The prop was the standard 70 x 81 when I bought the airplane. IMHO adding
1" in pitch without trimming (or, for a bit more bite, trimming an inch and
adding 2" in pitch) makes it a better match than the standard for a 160 hp
RV-3 if one really wants to nit-pick. The prop as it comes is actually OK
and will give a little bit better low-end performance than mine so it
probably isn't worth messing with.
The RV series has such a broad range between stall and redline that I
believe they really ought to have a controllable prop. My prop now reaches
redline about when the airframe does on the deck so for what I do most of,
it is pitched about right... but I can only get 2250 static. Takeoff &
climbout are still OK, but what a blast it would be to have all the HP
pulling from the time you release the brakes... for that reason, I will
likely be putting on an MT electric.
Johnny Johnson
49MM RV-3A O320-160
-----Original Message-----
From: owner-rv3-list-server@matronics.com
[mailto:owner-rv3-list-server@matronics.com] On Behalf Of rob ray
Subject: RE: RV3-List: Sensenich propellors
--> RV3-List message posted by: rob ray <smokyray@yahoo.com>
How do you like the prop now? After years of trashing wood props in rain, I
am looking at the sensy or really taking the plunge with an MT electric...
RR
Johnny Johnson <Johnny@wiktel.com> wrote:
--> RV3-List message posted by: "Johnny Johnson"
It's the legal 70 x 81 cut off 1" and repitched 2", the work was done per
Sensenich guidelines by a prop shop in Boise, ID. 81" was not enough pitch,
and the engine was 150 hp then. 69 x 83 seems about right for 160 hp.
Thanks for pointing out about the perils--very real perils--of severely
repitched Piper/Cessna/et al props... that is a no-no of the most extreme
nature, it is true. I should have been more specific in the original post.
Johnny Johnson
-----Original Message-----
From: owner-rv3-list-server@matronics.com
[mailto:owner-rv3-list-server@matronics.com] On Behalf Of Fred Bauer Jr
Subject: RV3-List: Sensenich propellors
--> RV3-List message posted by: "Fred Bauer Jr"
On a recent post [JJ] describing an RV3 with a 160 HP Lycoming we notice
that the Sensenich propeller was a 69 dia X 83 pitch.
We do not see where Sensenich and Van's offers that combination propeller,
the RV3 propeller Van's recommends is the Sensenich 70 dia X 81 pitch.
If the 69X83 Sensenich is a cut down 74DM propeller or another cut down
version of the Sensenich
BE CAREFUL !!!!!!!!!!!!!
John Thorp, the T-18 designer, went through a very detailed and complete
vibration analysis
after several fatal accidents with his T-18 design which involved using the
cut down propellers.
His conclusion was that the cut down propellers will fail!
NOT IF,
THEY WILL FAIL
I have never had a propeller fail on me so I may not know what I am talking
about but I can read and I can understand what I have read.
---------------------------------
Message 2
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| Subject: | Sensenich propellors |
--> RV3-List message posted by: rob ray <smokyray@yahoo.com>
Johnny;
I have flown no less than 5 different props on my 150 HP RV4. I have found in
1100 hours that all FP props are a compromise especially during high density
altitude climbs.I also found I spend 30% of my flying time climbing. I get decent
all round performance with my Margie Warnke claw but Jim Ayers has planted
the MT bug. After seeing his RV3 at OSH I think the improvement would add performance
and value. Hey it's only money...
I am visiting MT props in Deland FL tomorrow to look at an MT electric....
Rob Ray
Johnny Johnson <Johnny@wiktel.com> wrote:
--> RV3-List message posted by: "Johnny Johnson"
If a person is going to have a fixed-pitch prop, I would feel comfortable
recommending the Sensenich... the 2600 rpm limit on the O320 prop is a bit
of a bummer tho. I have not flown a wooden prop on this--or any other
fast--airplane so don't know how wood compares in performance & smoothness.
The prop was the standard 70 x 81 when I bought the airplane. IMHO adding
1" in pitch without trimming (or, for a bit more bite, trimming an inch and
adding 2" in pitch) makes it a better match than the standard for a 160 hp
RV-3 if one really wants to nit-pick. The prop as it comes is actually OK
and will give a little bit better low-end performance than mine so it
probably isn't worth messing with.
The RV series has such a broad range between stall and redline that I
believe they really ought to have a controllable prop. My prop now reaches
redline about when the airframe does on the deck so for what I do most of,
it is pitched about right... but I can only get 2250 static. Takeoff &
climbout are still OK, but what a blast it would be to have all the HP
pulling from the time you release the brakes... for that reason, I will
likely be putting on an MT electric.
Johnny Johnson
49MM RV-3A O320-160
-----Original Message-----
From: owner-rv3-list-server@matronics.com
[mailto:owner-rv3-list-server@matronics.com] On Behalf Of rob ray
Subject: RE: RV3-List: Sensenich propellors
--> RV3-List message posted by: rob ray
How do you like the prop now? After years of trashing wood props in rain, I
am looking at the sensy or really taking the plunge with an MT electric...
RR
Johnny Johnson wrote:
--> RV3-List message posted by: "Johnny Johnson"
It's the legal 70 x 81 cut off 1" and repitched 2", the work was done per
Sensenich guidelines by a prop shop in Boise, ID. 81" was not enough pitch,
and the engine was 150 hp then. 69 x 83 seems about right for 160 hp.
Thanks for pointing out about the perils--very real perils--of severely
repitched Piper/Cessna/et al props... that is a no-no of the most extreme
nature, it is true. I should have been more specific in the original post.
Johnny Johnson
-----Original Message-----
From: owner-rv3-list-server@matronics.com
[mailto:owner-rv3-list-server@matronics.com] On Behalf Of Fred Bauer Jr
Subject: RV3-List: Sensenich propellors
--> RV3-List message posted by: "Fred Bauer Jr"
On a recent post [JJ] describing an RV3 with a 160 HP Lycoming we notice
that the Sensenich propeller was a 69 dia X 83 pitch.
We do not see where Sensenich and Van's offers that combination propeller,
the RV3 propeller Van's recommends is the Sensenich 70 dia X 81 pitch.
If the 69X83 Sensenich is a cut down 74DM propeller or another cut down
version of the Sensenich
BE CAREFUL !!!!!!!!!!!!!
John Thorp, the T-18 designer, went through a very detailed and complete
vibration analysis
after several fatal accidents with his T-18 design which involved using the
cut down propellers.
His conclusion was that the cut down propellers will fail!
NOT IF,
THEY WILL FAIL
I have never had a propeller fail on me so I may not know what I am talking
about but I can read and I can understand what I have read.
---------------------------------
====================================
---------------------------------
Message 3
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| Subject: | Re: Sensenich propellors |
--> RV3-List message posted by: Arvil <arvil@bellsouth.net>
Let me know what you think of the elec. prop
rob ray wrote:
> --> RV3-List message posted by: rob ray <smokyray@yahoo.com>
>
> Johnny;
>
> I have flown no less than 5 different props on my 150 HP RV4. I have found
in 1100 hours that all FP props are a compromise especially during high density
altitude climbs.I also found I spend 30% of my flying time climbing. I get decent
all round performance with my Margie Warnke claw but Jim Ayers has planted
the MT bug. After seeing his RV3 at OSH I think the improvement would add performance
and value. Hey it's only money...
> I am visiting MT props in Deland FL tomorrow to look at an MT electric....
>
> Rob Ray
>
> Johnny Johnson <Johnny@wiktel.com> wrote:
> --> RV3-List message posted by: "Johnny Johnson"
>
> If a person is going to have a fixed-pitch prop, I would feel comfortable
> recommending the Sensenich... the 2600 rpm limit on the O320 prop is a bit
> of a bummer tho. I have not flown a wooden prop on this--or any other
> fast--airplane so don't know how wood compares in performance & smoothness.
>
> The prop was the standard 70 x 81 when I bought the airplane. IMHO adding
> 1" in pitch without trimming (or, for a bit more bite, trimming an inch and
> adding 2" in pitch) makes it a better match than the standard for a 160 hp
> RV-3 if one really wants to nit-pick. The prop as it comes is actually OK
> and will give a little bit better low-end performance than mine so it
> probably isn't worth messing with.
>
> The RV series has such a broad range between stall and redline that I
> believe they really ought to have a controllable prop. My prop now reaches
> redline about when the airframe does on the deck so for what I do most of,
> it is pitched about right... but I can only get 2250 static. Takeoff &
> climbout are still OK, but what a blast it would be to have all the HP
> pulling from the time you release the brakes... for that reason, I will
> likely be putting on an MT electric.
>
> Johnny Johnson
> 49MM RV-3A O320-160
>
> -----Original Message-----
> From: owner-rv3-list-server@matronics.com
> [mailto:owner-rv3-list-server@matronics.com] On Behalf Of rob ray
> To: rv3-list@matronics.com
> Subject: RE: RV3-List: Sensenich propellors
>
> --> RV3-List message posted by: rob ray
>
> How do you like the prop now? After years of trashing wood props in rain, I
> am looking at the sensy or really taking the plunge with an MT electric...
>
> RR
>
> Johnny Johnson wrote:
> --> RV3-List message posted by: "Johnny Johnson"
>
> It's the legal 70 x 81 cut off 1" and repitched 2", the work was done per
> Sensenich guidelines by a prop shop in Boise, ID. 81" was not enough pitch,
> and the engine was 150 hp then. 69 x 83 seems about right for 160 hp.
>
> Thanks for pointing out about the perils--very real perils--of severely
> repitched Piper/Cessna/et al props... that is a no-no of the most extreme
> nature, it is true. I should have been more specific in the original post.
>
> Johnny Johnson
>
> -----Original Message-----
> From: owner-rv3-list-server@matronics.com
> [mailto:owner-rv3-list-server@matronics.com] On Behalf Of Fred Bauer Jr
> To: rv3-list@matronics.com
> Subject: RV3-List: Sensenich propellors
>
> --> RV3-List message posted by: "Fred Bauer Jr"
>
> On a recent post [JJ] describing an RV3 with a 160 HP Lycoming we notice
> that the Sensenich propeller was a 69 dia X 83 pitch.
> We do not see where Sensenich and Van's offers that combination propeller,
> the RV3 propeller Van's recommends is the Sensenich 70 dia X 81 pitch.
> If the 69X83 Sensenich is a cut down 74DM propeller or another cut down
> version of the Sensenich
> BE CAREFUL !!!!!!!!!!!!!
> John Thorp, the T-18 designer, went through a very detailed and complete
> vibration analysis
> after several fatal accidents with his T-18 design which involved using the
> cut down propellers.
> His conclusion was that the cut down propellers will fail!
> NOT IF,
> THEY WILL FAIL
> I have never had a propeller fail on me so I may not know what I am talking
> about but I can read and I can understand what I have read.
>
> ---------------------------------
>
> ====================================
>
> ---------------------------------
>
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