Today's Message Index:
----------------------
1. 05:44 AM - Re: Harmonic/ Vibration Damper (Archie)
2. 01:45 PM - Re: Harmonic/ Vibration Damper (LessDragProd@aol.com)
3. 02:02 PM - Re: Harmonic/ Vibration Damper (Vic Jacko)
4. 02:42 PM - Re: Harmonic/ Vibration Damper (LessDragProd@aol.com)
5. 10:42 PM - Re: Harmonic/ Vibration Damper (red)
Message 1
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| Subject: | Re: Harmonic/ Vibration Damper |
--> Engines-List message posted by: "Archie" <archie97@earthlink.net>
>
> Archie, would you please make a short comment on the use of the subject
> damper.
>
> Vic
I build racing automotive type racing engines,
and have not personally installed one on an aircraft engine.
I will be conducting an engine balancing seminar at OSH,
where I will touch on harmonic dampeners and counterweighted
crankshafts.
In order to minimize any prop/engine harmonics at
a low rpm, the device might have to be about two feet in diameter.
The best bang for the space/buck is to incorporate something
no larger than the spinner, but perhaps 4-5inches thick.
(I am commenting based on my automotive use, and a
number of aircraft engines I have balanced).
Although I condone the use of a well manufactured HD,
there is no substitute for a well balanced engine, and a
prop that has been also balanced to/on that specific engine.
Remember that after this is done, all spinner screws must be
replaced exactly where removed, as well as the prop bolts.
I personally equalize them all, so that regardless of their
replacement position, everything maintains equilibrium
upon re-installation.
Short? sorry, I can go on, and on, and on........
Archie
Message 2
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| Subject: | Re: Harmonic/ Vibration Damper |
--> Engines-List message posted by: LessDragProd@aol.com
Hi Vic,
Like someone else on the list indicated, it sounds like you have a harmonic
dampener installed on the ring gear. However, even an RV doesn't need extra
weight just added on. Move the existing weight, if the CG needs to be changed.
Also, a 3 blade propeller eliminates a second order harmonic. Much more
effective for vibration reduction, since the source of the vibration is eliminated.
As an analogy; installing a 3 blade propeller makes it seem like you replaced
the Lycoming with an electric motor.
I know. I've done it on a four cylinder engine, and a six cylinder engine.
Jim Ayers
Less Drag Products, Inc.
OEM MT Propeller Distributor
In a message dated 06/05/2004 7:37:36 PM Pacific Daylight Time,
vicwj@earthlink.net writes:
List, , I found the ad for the damper in Sport Aviation under
"Propellers". This device is made by Mark Landoll and retails for $375.
I think I will try it if my weight and balance is aft.
Any other users have comments especially with and without the use of same.
Thanks,
Vic
Message 3
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| Subject: | Re: Harmonic/ Vibration Damper |
--> Engines-List message posted by: "Vic Jacko" <vicwj@earthlink.net>
Jim,
Sure sounds like you are in the propeller business! (just kidding)
I don't believe I want to go to the additional weight and price expense for
a constant speed or in-flight variable pitch prop.
I am in full agreement with you concerning adding more weight just to
balance an aircraft. This should be against the law but of course it is as
it tries to defy gravity. "Newton"
My goal is to try to build the lightest RV-9A possible thus I will not use
this damper.
Do you know of a fixed pitch three bladed prop that will work on my project?
Thanks for your help.
Vic
----- Original Message -----
From: <LessDragProd@aol.com>
Subject: Re: Engines-List: Harmonic/ Vibration Damper
> --> Engines-List message posted by: LessDragProd@aol.com
>
> Hi Vic,
>
> Like someone else on the list indicated, it sounds like you have a
harmonic
> dampener installed on the ring gear. However, even an RV doesn't need
extra
> weight just added on. Move the existing weight, if the CG needs to be
changed.
>
> Also, a 3 blade propeller eliminates a second order harmonic. Much more
> effective for vibration reduction, since the source of the vibration is
eliminated.
>
> As an analogy; installing a 3 blade propeller makes it seem like you
replaced
> the Lycoming with an electric motor.
> I know. I've done it on a four cylinder engine, and a six cylinder
engine.
>
> Jim Ayers
> Less Drag Products, Inc.
> OEM MT Propeller Distributor
>
>
> In a message dated 06/05/2004 7:37:36 PM Pacific Daylight Time,
> vicwj@earthlink.net writes:
> List, , I found the ad for the damper in Sport Aviation under
> "Propellers". This device is made by Mark Landoll and retails for $375.
>
> I think I will try it if my weight and balance is aft.
>
> Any other users have comments especially with and without the use of same.
>
> Thanks,
>
> Vic
>
>
Message 4
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| Subject: | Re: Harmonic/ Vibration Damper |
--> Engines-List message posted by: LessDragProd@aol.com
Hi Vic,
There could be a fixed pitch 3 blade prop that some makes.
Perhaps someone on this list knows who they are.
When I worked for someone else, it was never allowed to "sell away". (A
little different approach from what we have all seen in the movie; Miracle on 34th
street.)
Having flown for 7 years with a fixed pitch wood propeller on my RV-3, I
appreciate where you are coming from.
However, installing the MTV-7-C/L175-112 3 blade electric CS propeller on my
RV-3 was the best thing I have ever done for the overall performance of the
airplane.
Cross country cruise altitude has been expanded to 17,500'. :-)
Adds a new dimension when asking for winds aloft.
Jim Ayers
In a message dated 06/06/2004 2:03:17 PM Pacific Daylight Time,
vicwj@earthlink.net writes:
Jim,
Sure sounds like you are in the propeller business! (just kidding)
I don't believe I want to go to the additional weight and price expense for
a constant speed or in-flight variable pitch prop.
I am in full agreement with you concerning adding more weight just to
balance an aircraft. This should be against the law but of course it is as
it tries to defy gravity. "Newton"
My goal is to try to build the lightest RV-9A possible thus I will not use
this damper.
Do you know of a fixed pitch three bladed prop that will work on my project?
Thanks for your help.
Vic
Message 5
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| Subject: | Re: Harmonic/ Vibration Damper |
--> Engines-List message posted by: "red" <redswings@reds-headers.com>
Craig Catto makes (nice) three bade fixed pitch props--has a web site, may
be cattoprop.com
Red Hamilton
----- Original Message -----
From: <LessDragProd@aol.com>
Subject: Re: Engines-List: Harmonic/ Vibration Damper
> --> Engines-List message posted by: LessDragProd@aol.com
>
> Hi Vic,
>
> There could be a fixed pitch 3 blade prop that some makes.
> Perhaps someone on this list knows who they are.
>
> When I worked for someone else, it was never allowed to "sell away". (A
> little different approach from what we have all seen in the movie; Miracle
on 34th
> street.)
>
> Having flown for 7 years with a fixed pitch wood propeller on my RV-3, I
> appreciate where you are coming from.
> However, installing the MTV-7-C/L175-112 3 blade electric CS propeller on
my
> RV-3 was the best thing I have ever done for the overall performance of
the
> airplane.
>
> Cross country cruise altitude has been expanded to 17,500'. :-)
> Adds a new dimension when asking for winds aloft.
>
> Jim Ayers
>
>
> In a message dated 06/06/2004 2:03:17 PM Pacific Daylight Time,
> vicwj@earthlink.net writes:
> Jim,
>
> Sure sounds like you are in the propeller business! (just kidding)
>
> I don't believe I want to go to the additional weight and price expense
for
> a constant speed or in-flight variable pitch prop.
>
> I am in full agreement with you concerning adding more weight just to
> balance an aircraft. This should be against the law but of course it is
as
> it tries to defy gravity. "Newton"
>
> My goal is to try to build the lightest RV-9A possible thus I will not use
> this damper.
>
> Do you know of a fixed pitch three bladed prop that will work on my
project?
>
> Thanks for your help.
>
> Vic
>
>
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