RV10-List Digest Archive

Mon 01/05/15


Total Messages Posted: 8



Today's Message Index:
----------------------
 
     1. 06:35 AM - Re: Re: New Engine Questions (William Greenley)
     2. 06:46 AM - Re: Re: New Engine Questions (Kelly McMullen)
     3. 08:25 AM - Ram air (bob88)
     4. 08:43 AM - Re: New Engine Questions (rv10flyer)
     5. 08:53 AM - Re: Ram air (Bob Leffler)
     6. 09:24 AM - Re: Ram air (bob88)
     7. 09:43 AM - Re: Painting the Baffles (Flysrv10)
     8. 09:54 AM - Re: Re: Ram air (Bob Leffler)
 
 
 


Message 1



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    Time: 06:35:11 AM PST US
    Subject: Re: New Engine Questions
    From: William Greenley <wgreenley@gmail.com>
          
      Reports I have heard say that the two blade can be just as smooth if you
      get it dynamically balanced.
      
      On Sun, Jan 4, 2015 at 11:54 PM, rv10flyer <wayne.gillispie@gmail.com>
      wrote:
      
      >
      > I would go with the three blade Hartzell for less vibration if doing it
      > over and I had plenty of money in the bank. Who cares about a few knots on
      > a 3-4 hr trip. Just get to the airport 10 minutes earlier.
      >
      > --------
      > Wayne G.
      >
      >
      > Read this topic online here:
      >
      > http://forums.matronics.com/viewtopic.php?p=436642#436642
      >
      >
      


    Message 2

    

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    Time: 06:46:37 AM PST US
    From: Kelly McMullen <kellym@aviating.com>
    Subject: Re: New Engine Questions
          
      
      A two blade can be made relatively smooth with dynamic balancing. It 
      will not be as smooth as a balanced 3 blade. Simple physics.
      A six cylinder fires every 120 degrees. A three bladed prop has the 
      blades 120 degrees apart. Same reason a 2 blade is smoother on a 4 cyl 
      engine than a 3 blade, because a 4 cyl fires every 180 degrees.
      A composite prop, whether carbon fiber, or fiberglass over wood will be 
      smoother than a metal blade, because the composite blades have some flex 
      and absorb vibration. Composite blades allow more optimization of blade 
      shape than is possible with metal, so they tend to have less speed 
      difference than a metal 3 blade. I've seen many reports of 3 bladed 
      composite giving up no detectable speed to a 2 blade metal prop. 
      However, blades cost money, composite costs money. So 2 blade aluminum 
      will always be your lowest cost if marketing doesn't play games.
      On 1/5/2015 7:32 AM, William Greenley wrote:
      > Reports I have heard say that the two blade can be just as smooth if 
      > you get it dynamically balanced.
      >
      > On Sun, Jan 4, 2015 at 11:54 PM, rv10flyer <wayne.gillispie@gmail.com 
      > <mailto:wayne.gillispie@gmail.com>> wrote:
      >
      >     <wayne.gillispie@gmail.com <mailto:wayne.gillispie@gmail.com>>
      >
      >     I would go with the three blade Hartzell for less vibration if
      >     doing it over and I had plenty of money in the bank. Who cares
      >     about a few knots on a 3-4 hr trip. Just get to the airport 10
      >     minutes earlier.
      >
      >     --------
      >     Wayne G.
      >
      >
      >     Read this topic online here:
      >
      >     http://forums.matronics.com/viewtopic.php?p=436642#436642
      >
      >
      >     ==========
      >     br> fts!)
      >     r> > com" target="_blank">www.aeroelectric.com
      >     w.buildersbooks.com" target="_blank">www.buildersbooks.com
      >     p.com" target="_blank">www.homebuilthelp.com
      >     e.com" target="_blank">www.mypilotstore.com
      >     " target="_blank">www.mrrace.com
      >     target="_blank">http://www.matronics.com/contribution
      >               -Matt Dralle, List Admin.
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      >     -List" target="_blank">http://www.matronics.com/Navigator?RV10-List
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    Message 3

    

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    Time: 08:25:18 AM PST US
    Subject: Ram air
    From: "bob88" <marty.crooks@comcast.net>
          
      
      Anyone with experience using the Rod Bower ram air unit in place of the Vans air
      box and filter?
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=436651#436651
      
      


    Message 4

    

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    Time: 08:43:59 AM PST US
    Subject: Re: New Engine Questions
    From: "rv10flyer" <wayne.gillispie@gmail.com>
          
      
      Mine has been dynamically balanced and I have flown behind both props. I just did
      not have the funds for the upgrade. We still love our family hauler.
      
      --------
      Wayne G.
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=436652#436652
      
      


    Message 5

    

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    Time: 08:53:33 AM PST US
    From: Bob Leffler <rv@thelefflers.com>
    Subject: Re: Ram air
          
      
      Yes.   I have one and probably wouldn't install it if I did another build.  
      
      It does work as advertised, but there is no data that compares it in a standard
      configuration.   Open it will increase manifold pressure.   Closed because its
      using air from the cowl, it's unclear if running in a reduced power state. 
      
      
      Sent from my iPhone
      
      On Jan 5, 2015, at 11:22 AM, bob88 <marty.crooks@comcast.net> wrote:
      
      
      Anyone with experience using the Rod Bower ram air unit in place of the Vans air
      box and filter?
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=436651#436651
      
      


    Message 6

    

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    Time: 09:24:30 AM PST US
    Subject: Re: Ram air
    From: "bob88" <marty.crooks@comcast.net>
          
      
      I presume there is no need for alternate air with the Bower unit as it seems to
      be using alternate air whenever closed in any case.  Alternate air in my Cessna
      causes significant drop in MP relative to regular intake through the air filter.
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=436654#436654
      
      


    Message 7

    

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    Time: 09:43:11 AM PST US
    From: Flysrv10 <flysrv10@gmail.com>
    Subject: Re: Painting the Baffles
          
      Mine is Aldine. Looks great after 8 yrs and 900 hrs. 
      
      Do not archive. 
      
      Sent from my iPhone
      
      > On Jan 4, 2015, at 12:09 AM, Vernon Franklin <vernon.franklin@gmail.com> w
      rote:
      > 
      > Are there any protective benefits to painting the baffles?  Or do most jus
      t let their baffles go au naturel?
      > 
      > Paint, clear coat, or primer?  What products can take the heat and are saf
      e to use?
      > 
      > -- 
      > Vernon Franklin
      > 
      > 
      3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
      D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
      =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
      3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
      D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
      =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
      3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
      D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
      =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
      3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
      D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
      =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
      > 
      


    Message 8

    

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    Time: 09:54:42 AM PST US
    From: Bob Leffler <rv@thelefflers.com>
    Subject: Re: Ram air
          
      
      The drop in MP is what I alluded to in my previous email.  
      
      There are folks that believe that the use of the hotter cowl air yields a lower
      MP than the stand intake with a filter.  I typically get 27.7 MP. 
      
      Since there has been no test on the same aircraft and engine, there is no data
      to prove or disprove that theory. 
      
      The other non-answered question is with the ram air, how much more MP is there
      over a standard configuration with filtered air?
      
      It is true you get about an inch of boost between closed an open, buts unclear
      to me if it really benefits over a standard installation.  
      
      I knob that I seem to be a tad slower than Geoff's and about the same as Dana's.
       What is causing the differences is yet to be determined.  Different air filters,
      fuel injection, electronic ignition, etc could also have an impact.  
      
      It's just darn impossible to get the data to do a more scientific comparison. 
      
      Sent from my iPhone
      
      On Jan 5, 2015, at 12:22 PM, bob88 <marty.crooks@comcast.net> wrote:
      
      
      I presume there is no need for alternate air with the Bower unit as it seems to
      be using alternate air whenever closed in any case.  Alternate air in my Cessna
      causes significant drop in MP relative to regular intake through the air filter.
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=436654#436654
      
      

    

    


    

    

    

    

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