REFLECTOR: Fwd: My Velocity setup

[Brian Michalk]

There is a similar fan on some helicopters.

 Brian Michalk  <http://www.michalk.com>
Life is what you make of it ... never wish you had done something.
Aviator, experimental aircraft builder, motorcyclist, SCUBA diver
musician, home-brewer, entrepreneur and barely single


> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
> Behalf Of Jim Agnew
> Sent: Saturday, December 04, 2004 8:19 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Fwd: My Velocity setup
>
>
> If you look at a lot of the new small blimps you will find a fan
> inside the
> engine cowling attached between the engine prop hub and the prop
> extension.
> The fan is a flat many blade device that looks like the turbo fan
> on the front
> of many of the large jet engines.  Obviously blimps don't have a
> lot of ram
> pressure and spend a lot of time almost stopped.  This installation was on
> Lycoming engines.
>
> Jim
>
> --- Jim Sower <canarder at frontiernet.net> wrote:
>
> > Probably. I've seen such a setup on a Long-EZ and the guy swears by it.
> >
> >
> > ouglas Holub wrote:
> >
> > > Would it help to suck air through the NACA ducts if I put a
> fan on the
> > > prop extender just before it exits the cowl?
> > > Doug Holub
> > >
> > >     ----- Original Message -----
> > >     *From:* Al Gietzen <mailto:ALVentures at cox.net>
> > >     *To:* 'Velocity Aircraft Owners and Builders list'
> > >     <mailto:reflector at tvbf.org>
> > >     *Sent:* Friday, December 03, 2004 10:54 AM
> > >     *Subject:* RE: REFLECTOR: Fwd: My Velocity setup
> > >
> > >     My idea behind this is to scavange some of the flow that comes
> > >     through the bottom radiator, across the bottom of the pan, and out
> > >     the "suction slot". at about 18" from the center of prop rotation,
> > >     it should also add to the suction the prop places on the cowl
> > >     opennings. Well.. at least that is my idea, we'll see if it works
> > >     out. I am hoping that I can get away without an oil cooler with
> > >     that setup. No worries though, I have a backup to put an inline
> > >     cooler on the #2 NACA scoop if I need it.
> > >
> > >     Keep in mind that the reduced pressure (suction) generated by
> > >     the prop dissipates rapidly (exponentially) as you move away from
> > >     the prop, so even a foot is a long way - and at cruise it is
> > >     almost non-existent; you have to rely on dynamic pressure and
> > >     whatever gradients are produced by the flow. Remember, the air is
> > >     standing still, the airplane is moving. Some air is getting
> > >     pushed/pulled downward by the airfoils, some is being pushed back
> > >     by the prop, the rest is getting out of the way as best it can.
> > >
> > >     Al
> > >
> > >
> > ------------------------------------------------------------------------
> > >     __
> > >
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>
> =====
> James F. Agnew
> Jim_Agnew_2 at Yahoo.Com
> Tampa, FL
> Velocity 173 Elite Aircraft Completed & Flying
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