REFLECTOR: Propellers 1 2 3 4 Blades

[Douglas Holub]

I love my Prince P-tip 2-blade cruise prop. 67 x 76.  It's carbon fiber over 
maple. Supposedly the P-tip makes the blade more efficient, and supposedly 
the blade twists down to about 73" during take-off. All I know is that I get 
off the ground easily in 1500 feet with just me and 25 gallons of fuel. I 
have a standard FG, and it only weighs 1286 lbs empty.  That prop will move 
the airplane 200 mph at 4000 feet. My engine is a parallel valve, 190 hp ECI 
IOX-360.

Doug Holub
Standard FG w/ electric nose lift
130 hours. Putting the wings back on after paint and new interior.

----- Original Message ----- 
From: "Velocity" <velocityxl at fastmail.fm>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Saturday, November 17, 2012 11:46 AM
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
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