REFLECTOR: re. Propellers 1 2 3 4 Blades (Velocity)

Dave T Nelson dtnelson at us.ibm.com
Sun Nov 18 08:45:55 CST 2012


I'd suggest a talk with Gary Hertzler... he's a great guy, a very
knowledgeable aerodynamicist, and a canard expert.  His "Silver Bullet"
props have practically pushed every other canard pusher prop maker out of
the business.  He's also extremely approachable, friendly, and almost
certainly willing to discuss / help.

Dave

Dave T. Nelson
T/L 553-4327, Voice 507-253-4327, Fax 507-253-3648
Program Director, ISC ECAT NPI & Test Engineering


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  |reflector-request at tvbf.org                                                                                                                        |
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  |reflector at tvbf.org                                                                                                                                |
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  |11/17/2012 11:59 AM                                                                                                                               |
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  |Reflector Digest, Vol 92, Issue 33                                                                                                                |
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  |reflector-bounces at tvbf.org                                                                                                                        |
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Today's Topics:

   1.  Propellers 1 2 3 4 Blades (Velocity)
   2. Re:  Propellers 1 2 3 4 Blades (Mark Magee)


----- Message from Velocity <velocityxl at fastmail.fm> on Sat, 17 Nov 2012
10:46:28 -0600 -----
                                                           
      To: Velocity Aircraft Owners and Builders list       
          <reflector at tvbf.org>                             
                                                           
 Subject: REFLECTOR: Propellers 1 2 3 4 Blades             
                                                           


I am working on making my second propeller. My first one is a three
blade. I works just as
it was designed for,  great take off performance. I  now think I would
like to have one that has
a bit more top speed. Now a single blade propeller is the most efficient
but a little
impractical and hard to balance. So my question is a 2 bladed propeller
would be the next most efficacy
and easiest to build but my fear is having both blades traveling through
the wake from the wings.
at the same time . A four bladed propeller  has the same issue as a two
blade just twice the frequency .
  Any thoughts on the choice of number of blades.

More blades equals smaller diameter but I have enough room to swing a 2
blade so that is not an issue .

Long easy guys seem to have no issue with two blades . Any one in the
velocity world
use a two blade propeller with or with out success?


Ron

Velocity XLFG  Chevy LT1  300 hp



----- Message from Mark Magee <edjonesbrady at gmail.com> on Sat, 17 Nov 2012
10:58:42 -0600 -----
                                                           
      To: Velocity Aircraft Owners and Builders list       
          <reflector at tvbf.org>                             
                                                           
      cc: Velocity Aircraft Owners and Builders list       
          <reflector at tvbf.org>                             
                                                           
 Subject: Re: REFLECTOR: Propellers 1 2 3 4 Blades         
                                                           


The less blades, the longer the blade, the closer the tip is to the runway,
the most FOD.

Mark B. Magee
N34XL
Sent from IPhone 4S

On Nov 17, 2012, at 10:46 AM, Velocity <velocityxl at fastmail.fm> wrote:

> I am working on making my second propeller. My first one is a three
blade. I works just as
> it was designed for,  great take off performance. I  now think I would
like to have one that has
> a bit more top speed. Now a single blade propeller is the most efficient
but a little
> impractical and hard to balance. So my question is a 2 bladed propeller
would be the next most efficacy
> and easiest to build but my fear is having both blades traveling through
the wake from the wings.
> at the same time . A four bladed propeller  has the same issue as a two
blade just twice the frequency .
> Any thoughts on the choice of number of blades.
>
> More blades equals smaller diameter but I have enough room to swing a 2
blade so that is not an issue .
>
> Long easy guys seem to have no issue with two blades . Any one in the
velocity world
> use a two blade propeller with or with out success?
>
>
> Ron
>
> Velocity XLFG  Chevy LT1  300 hp
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