From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Rotary Engine Noise
Date: Mon, 11 May 2020 13:01:00 +0800
References: <list-229318@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-229318@logan.com>
Message-Id: <0A3F44D4-1368-4FF4-88B3-CFC0FCC9EB5A@gmail.com>

Thanks Andrew.
Yes please, the relevant pages re shape of inlets. Do we know is this is =
still the current science?

Steve

> On 11 May 2020, at 10:42 am, Andrew Martin andrew@martinag.com.au =
<flyrotary@lancaironline.net> wrote:
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> Aerodynamics of Propulsion
> Dietrich Kuchemann
> Johanna Weber
> 1st Edition 1953.
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> I got a copy at reasonable price, it is a photocopy of an original, =
but cannot for the life of me find the bookstore I purchased from. but =
vague memory makes me think it was a online specialty technical =
bookstore that only sells photocopies from their library copies.( I =
know, lots a help!)=F0=9F=98=80
> Well worth the read if you can find it.
> I could possibly scan a few relevant chapters if needed.
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> Regards
> Andrew Martin
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> On Sun, May 10, 2020 at 6:14 AM Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
> Hi Finn
> Yes, I=E2=80=99d like the science on inlet lips.
> Just reworked our oil inlet and all I have is this drawing.
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> Steve
> <dmilokfngohbjnef.png>
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>> On 9 May 2020, at 10:15 pm, Finn Lassen finn.lassen@verizon.net =
<flyrotary@lancaironline.net> wrote:
>>=20
>> Opposite of what I understand:
>> You want a large external radius and a smaller inside radius.
>>=20
>> I've in vain been searching for the NACA paper that Tracy Crook get =
the exact number (internal/external) from. Probably somewhere between =
0.5 and 0.8.
>>=20
>> Finn
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>> On 5/8/2020 11:02 PM, Terry Adams terrywadams@sbcglobal.net wrote:
>>> You may want to test the lip/airflow on the scoop to your =
cooling.=C3=AF=C2=BF=C2=BD Adding a generous radius to the inside may =
add considerable airflow.=C3=AF=C2=BF=C2=BD Consult the work and =
directions given by Peter Garrison and his plane Melmoth =
(www.melmoth2.com).=C3=AF=C2=BF=C2=BD jm2c fwiw
>>>=20
>>> Terry
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>>> On 5/8/2020 3:34 PM, 12348ung@gmail.com wrote:
>>>> Le Roux,
>>>>                     You have done a great job so I hesitate to add =
photos of
>>>> my work, but here goes   Neil.
>>>>=20
>>>> -----Original Message-----
>>>> From: Rotary motors in aircraft=20
>>>> <flyrotary@lancaironline.net>
>>>> =20
>>>> Sent: Friday, May 8, 2020 10:31 PM
>>>> To: Rotary motors in aircraft=20
>>>> <flyrotary@lancaironline.net>
>>>>=20
>>>> Subject: [FlyRotary] Re: Rotary Engine Noise
>>>>=20
>>>> Hello Le Roux:
>>>> This Frontal photo tells you quite a bit about my cowlings and my =
airplane.
>>>> The top two inlets are for my oil coolers (2 x Fluidyne DB-30416) =
and the
>>>> bottom inlet is for my radiator (Griffin 2-58185-X).
>>>> With a "Chubby Cubby" drag is given, things like Aero-Turbine =
mufflers and
>>>> long exhaust pipes (to get noise behind cabin) are not too =
significant.=20
>>>>=20
>>>>=20
>>>> Jeff: Thanks for taking us aboard the flight over the Ottawa River!
>>>>=20
>>>> I am a relative new member on the group, and are not on terms, with =
the FWF
>>>> installations of the members.
>>>>=20
>>>> Is it possible to post some info of your 13B installation and =
cowling?
>>>> =20
>>>>=20
>>>> Thanks Le Roux Breytenbach
>>>>=20
>>>> South Africa
>>>>=20
>>>>=20
>>>>=20
>>>> --
>>>> Homepage: =20
>>>> http://www.flyrotary.com/
>>>>=20
>>>> Archive and UnSub:  =20
>>>> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>>>=20
>>> --=20
>>> Communication ink and paper free
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