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From: "Paul" <sqpilot@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>,
	"David Carter" <dcarter@datarecall.net>
References: <list-743618@logan.com>
Subject: Re: [FlyRotary] Re: I found the power
Date: Fri, 18 Feb 2005 09:07:00 -0600
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Thanks, David but unfortunately, I have a pusher, and there are no propeller 
pulses to augment the ram air flow.  Paul Conner

----- Original Message ----- 
From: "David Carter" <dcarter@datarecall.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, February 17, 2005 5:44 PM
Subject: [FlyRotary] Re: I found the power


> Rather than NACA, might consider a "speed mod" described in book "Speed 
> with
> Economy" by Kent Paser, Paser Publications, 5672 West Chesnut Ave,
> Littleton, Colorado 80123 (1994), Chapter 3, Engine Intake System
> Modifications, starting page 52, ". . . use of propellor pressure pulses 
> to
> augment the ram air flow into the cowl carb air scoop." . . . ". . .the
> scoop was extended forward about 8 inches, and the scoop opening was
> rounded-off with an inlet area reduced to about 1.5 times that required 
> for
> sufficient flow to the carburetor. . . the scoop clears the propellor by
> only 5/8 of an inch, with an inlet area only 10% larger than the venturi
> throat area of the carburetor. . . .The scoop inlet is . . .about a 10
> degree angle into the advancing propellor blade. . .the sides of this 
> inner
> liner diverge at less than an 11 degree total angle.  Any larger . . .and
> the scoop would go turbulent"
>
> David Carter
>
> ----- Original Message ----- 
> From: "Paul" <sqpilot@bellsouth.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Wednesday, February 16, 2005 5:26 PM
> Subject: [FlyRotary] I found the power
>
>
> Today I finished installing the firesleeve on the remaing fuel lines, made
> some stand-offs so that the fuel lines would not be right up against the
> engine, and finished hooking up and securing a few other items. With the 
> top
> cowling off,  I ran the pumps for a minute, then checked for leaks...none
> found.  Then I started the engine and ran it for 20 or so seconds and shut
> it down and reinspected for fuel leaks. None found.  I restarted and 
> taxiied
> away from the hangar a bit so as to not be as loud for others in and near
> the hangar and did a full power runup.  I hit 5600 static rpm's. In the
> past, the best I could hope for was 5200, most of the time settling for 
> 5100
> rpm's.  I taxiied back in and installed the top cowling....max rpm's 5100.
> Took the top cowling back off....max rpm's 5600.  One more try....5100 
> with
> the cowling back on.  It is beginning to become more clear to me, that one
> of two things are affecting rpm's.  Option one is that with the top 
> cowling
> on the engine is ingesting heated air and just cannot develop the same 
> power
> as when it ingests outside unheated air.  Option two is the muffler 
> bearing
> may be worn.  I'm kinda leaning toward option one.
>     I was thinking of installing two small NACA ducts on the bottom of my
> cowling with two hoses coming up to feed air to my TWM throttlebody.  The
> NACA ducts I purchased from Van's RV (made for cowling ventilation) 
> already
> have a male outlet already molded in the assembly, so you just slide a 
> hose
> over it and secure with a clamp. Very simple installation.(Works well for 
> my
> cabin ventillation) If I recall correctly, they are about the same size as
> my throttle body bore. I wonder if I will loose much efficiency as the air
> goes through the corregated hose, and if the Van's RV ventillation NACA
> ducts will provide a sufficient volume of air. Of course while flying, I
> would have the advantage of a little bit of ram effect as well as the
> ability to suck in fresh outside air that has not been heated inside the
> cowling during taxi/takeoff run.  Any opinions/suggestions would of course
> be much appreciated.  I will discuss the vapor lock issue in the next 
> post,
> so as to not complicate responses, etc.  Thanks to all who reply.  Paul
> Conner
>
>
>
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