Today's Message Index:
----------------------
1. 04:02 AM - Re: Prop pitch (Bruce Smith)
2. 05:26 AM - Re: Prop pitch (Michael W. Meyer)
3. 11:44 AM - Re: Prop pitch (Gary Vogt)
4. 11:59 AM - Re: Prop pitch (Gary Vogt)
Message 1
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Gary,
No personal experience with this. It was a topic that came up over a fly-out dinner
to Reading PA the other day. It seems that with all the load components (centrifugal
and lift), the blades might change.
Bruce
On Jun 28, 2011, at 10:46 PM, Gary Vogt wrote:
> Bruce,
>
> That's a very good question. My opinion is that there is enough elasticity in
the blade that it should not change pitch over time. That is just a guess.
>
> Why? Do you have a prop with mixed pitches?
>
> Gary
>
> From: Bruce Smith <haveblue1@mac.com>
> To: teamgrumman-list@matronics.com
> Sent: Tue, June 28, 2011 6:52:23 PM
> Subject: TeamGrumman-List: Prop pitch
>
>
>
>
>
Message 2
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Navy steam turbines exhibit something called blade creep - they will get lon
ger over life due to the centrifugal force and thermal cycles they experienc
e. However, those turbines are in continuous operation for long periods of t
ime, we're talking about the fine tolerances of turbine assemblies, and it s
till takes a ship's lifetime to show up. The metallurgy's very different bet
ween steam turbine blades and our propeller blades, but I still kinda doubt i
t happens to a noticeable degree given the lack of a high temperature enviro
nment and relatively low duty cycle of our props.
Thanks,
Michael
Michael W Meyer
michael@flightsked.com
m: +1 781.248.7550
(sent from my iPhone, please excuse the brevity)
On Jun 29, 2011, at 3:59, Bruce Smith <haveblue1@mac.com> wrote:
> Gary,
>
> No personal experience with this. It was a topic that came up over a fly-o
ut dinner to Reading PA the other day. It seems that with all the load compo
nents (centrifugal and lift), the blades might change.
>
> Bruce
>
> On Jun 28, 2011, at 10:46 PM, Gary Vogt wrote:
>
>> Bruce,
>>
>> That's a very good question. My opinion is that there is enough elastici
ty in the blade that it should not change pitch over time. That is just a g
uess.
>>
>> Why? Do you have a prop with mixed pitches?
>>
>> Gary
>>
>> From: Bruce Smith <haveblue1@mac.com>
>> To: teamgrumman-list@matronics.com
>> Sent: Tue, June 28, 2011 6:52:23 PM
>> Subject: TeamGrumman-List: Prop pitch
>>
>>
>>
>> href="http://www.matronics.com/Navigator?TeamGrumman-List">http://www.m
atronics.com/Navigator?TeamGrumman-List
>> href="http://forums.matronics.com">http://forums.matronics.com
>> href="http://www.matronics.com/contribution">http://www.matronics.com/c
ontribution
>>
>>
>
Message 3
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Bruce,
I know they change in flight. I've seen high speed video of a prop in flight.
Trust me, something you don't want to see. What I am not sure of is whether
the prop takes a new set after repeated loadings. I'm calling my prop guy now.
. . . . . . . . Mike says that the metal will relax some and flatten out the
pitch over time but it is usually only a very small amount. Mike has been doing
props for 30 years.
Gary
________________________________
From: Bruce Smith <haveblue1@mac.com>
Sent: Wed, June 29, 2011 3:59:12 AM
Subject: Re: TeamGrumman-List: Prop pitch
Gary,
No personal experience with this. It was a topic that came up over a fly-out
dinner to Reading PA the other day. It seems that with all the load components
(centrifugal and lift), the blades might change.
Bruce
On Jun 28, 2011, at 10:46 PM, Gary Vogt wrote:
Bruce,
>
>
>That's a very good question. My opinion is that there is enough elasticity in
>the blade that it should not change pitch over time. That is just a guess.
>
>
>Why? Do you have a prop with mixed pitches?
>
>
>Gary
>
>
________________________________
From: Bruce Smith <haveblue1@mac.com>
>To: teamgrumman-list@matronics.com
>Sent: Tue, June 28, 2011 6:52:23 PM
>Subject: TeamGrumman-List: Prop pitch
>
>
>
>href="http://www.matronics.com/Navigator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List
> href="http://forums.matronics.com">http://forums.matronics.com
>href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
>
>
>
Message 4
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Hi Mike,
Long time no see.
Talking about turbine blades . . . . while going to school at the Von Karman
Institute for Fluid Dynamics in Belgium, we did flow visualization using fine
dust particles, smoke, and lasers. We watched the flow separation and
turbulence at the blade tips on a jet engine turning 10 to 10,000 rpms. It was
pretty cool. I don't recall the gap to the wall but I know it was close.
So, Mike, How are things? Stop by some time and bring the Mrs.
Gary
________________________________
From: Michael W. Meyer <michael@flightsked.com>
Sent: Wed, June 29, 2011 5:23:16 AM
Subject: Re: TeamGrumman-List: Prop pitch
Navy steam turbines exhibit something called blade creep - they will get longer
over life due to the centrifugal force and thermal cycles they experience.
However, those turbines are in continuous operation for long periods of time,
we're talking about the fine tolerances of turbine assemblies, and it still
takes a ship's lifetime to show up. The metallurgy's very different between
steam turbine blades and our propeller blades, but I still kinda doubt it
happens to a noticeable degree given the lack of a high temperature environment
and relatively low duty cycle of our props.
Thanks,
Michael
Michael W Meyer
michael@flightsked.com
m: +1 781.248.7550
(sent from my iPhone, please excuse the brevity)
On Jun 29, 2011, at 3:59, Bruce Smith <haveblue1@mac.com> wrote:
Gary,
>
>
>No personal experience with this. It was a topic that came up over a fly-out
>dinner to Reading PA the other day. It seems that with all the load components
>(centrifugal and lift), the blades might change.
>
>
>Bruce
>
>
>On Jun 28, 2011, at 10:46 PM, Gary Vogt wrote:
>
>Bruce,
>>
>>
>>That's a very good question. My opinion is that there is enough elasticity in
>>the blade that it should not change pitch over time. That is just a guess.
>>
>>
>>Why? Do you have a prop with mixed pitches?
>>
>>
>>Gary
>>
>>
>>
________________________________
From: Bruce Smith <haveblue1@mac.com>
>>To: teamgrumman-list@matronics.com
>>Sent: Tue, June 28, 2011 6:52:23 PM
>>Subject: TeamGrumman-List: Prop pitch
>>
>>
>>
>>href="http://www.matronics.com/Navigator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List
>> href="http://forums.matronics.com">http://forums.matronics.com
>>href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
>>
>>
>>
>
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