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From: david mccandless <daval@iprimus.com.au>
Subject: Re: [FlyRotary] silly intake idea of the day
Date: Thu, 12 May 2005 10:59:04 +0800
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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Hi Rusty, seems to me the whole idea of building the runners and horns=20=

in a plenum is shooting for 'tuned induction' .With this idea you have=20=

just screwed any chance of achieving tuned length. Ram air in the inlet=20=

at 100kt {V climb} is good for less than 1/4 psi at best, the tuned=20
length has much more benefit for volumetric efficiency than 1/4 psi.=20
Put a filter on the plenum and as far from it as will fit under the=20
cowl. FWIW, Dave McC { 6.5b in gestation}
On 12/05/2005, at 9:03 AM, Russell Duffy wrote:

> Greetings,
> =A0
> I've been trying to think of a way to incorporate a filter, along with=20=

> one of Tracy's shoebox type intakes.=A0 What do you think about =
putting=20
> a small K&N filter on the end of each of the intake tubes (see crude=20=

> "paint"ing)?=A0 I would=A0lose the air horns, but it would seem like a=20=

> fairly low loss on the filter restriction since the plenum is=20
> pressurized.=A0=A0
> =A0
> Cheers,
> Rusty (entertaining the list)
> =A0
> =A0<intake with tiny filters.JPG> Homepage:  http://www.flyrotary.com/
>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html

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Hi Rusty, seems to me the whole idea of building the runners and horns
in a plenum is shooting for 'tuned induction' .With this idea you have
just screwed any chance of achieving tuned length. Ram air in the
inlet at 100kt {V climb} is good for less than 1/4 psi at best, the
tuned length has much more benefit for volumetric efficiency than 1/4
psi. Put a filter on the plenum and as far from it as will fit under
the cowl. FWIW, Dave McC { 6.5b in gestation}

On 12/05/2005, at 9:03 AM, Russell Duffy wrote:


<excerpt><fontfamily><param>Arial</param>Greetings,</fontfamily>

=A0

<fontfamily><param>Arial</param>I've been trying to think of a way to
incorporate a filter, along with one of Tracy's shoebox type intakes.=A0
What do you think about putting a small K&N filter on the end of each
of the intake tubes (see crude "paint"ing)?=A0 I would=A0lose the air
horns, but it would seem like a fairly low loss on the filter
restriction since the plenum is pressurized.=A0=A0</fontfamily>

=A0

<fontfamily><param>Arial</param>Cheers,</fontfamily>

<fontfamily><param>Arial</param>Rusty (entertaining the =
list)</fontfamily>

=A0

=A0<<intake with tiny filters.JPG> Homepage:  http://www.flyrotary.com/

<excerpt><excerpt> Archive: =20
http://lancaironline.net/lists/flyrotary/List.html

</excerpt></excerpt></excerpt>=

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