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Date: Wed, 2 May 2007 10:27:25 -0700
From:  <tonyslongez@cox.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Can anyone tell me if this will work
Cc: Al Gietzen <ALVentures@cox.net>
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---- Al Gietzen <ALVentures@cox.net> wrote:=20
> =20
>=20
> what I'm trying to do is figure out how to set up my racing beat intake
> without the intake tubes going over the top. the (bearded one) says it wi=
ll
> work but is only for engines in the 10,000 RPM range and it's not good fo=
r
> 6500 -7000. does anyone. have any other suggestions. I will use four
> injectors but what I want to do is keep the profile as low as possible.
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> Tony;
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> What works and what is optimum are two different things.  And what is
> optimum depends on what your criteria are. You'll not know what is optimu=
m
> without putting it on a dyno and trying a lot of different things.
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> =20
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> My first impression looking at that intake is that it appears rather
> massive.  That's OK for a road vehicle, but not 'optimum' for an airplane=
.
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> =20
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> Lynn says: Short systems tend to have very well defined RPM peaks where l=
ong
> systems tend to null out well defined peaks, and are thus a bit easier to
> tune.=20
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> =20
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> I won=C2=92t argue with that, yet I have a short manifold (see photo) and=
 the
> torque curve, measured on the dyno, that varies only 10% from 2500 rpm to
> 7000 rpm, and is very constant (varies only about 2%) from 4800 to 7000.
> When torque is flat, hp is going linear upward with rpm.  Nothing wrong w=
ith
> that. =20
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> My conclusion is that if I used a longer =C2=91tuned=C2=92 induction, I c=
ould get a
> bit more power over a particular range near the tuned point.  But for me,
> optimum also meant a compact installation, and light weight.  My manifold
> for a three rotor weighs 2 =C2=BD lbs, the installation fits well, and po=
wer is
> good.  I suppose that one can argue that although the manifold is short
> (4.5=C2=94 flange to flange), the TB barrels add anther 5.5=C2=94 and the=
 fiberglass
> air plenum maybe adds some more.  Maybe it just involves some luck.
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> Al
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Al=20

Thanks for your reply.  You are right optimum is a better word. I can figur=
e optimum once I get it running on the test stand.

Tony=20