From: "Le Roux Breytenbach breytenbachleroux@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: MISTRAL
Date: Fri, 2 Apr 2021 08:26:28 +0200
Message-Id: <C1A28904-5A0C-41D0-AC09-702780C95D3D@gmail.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Charlie sorry, yes you are right a phonecall got in the way and ate my mail =F0=
=9F=99=88=F0=9F=99=88
Here is a link - of a RX7 forum
Scroll down and read only what you need.Very interesting how this guy calcul=
ate to determine the runner lenghts.
Further down on runner lenght calculations they talk about the Renesis motor=
 runner lenght.
Yes this is for car use but there is a lot of info what we need for tuning t=
he rotary on the =E2=80=9Csweet spot=E2=80=9D rpm.
The aquistic waves and speed of the intake air is very interesting=20

Regards

Sent from my iPhone
Le Roux Breytenbach=20

> On 02 Apr 2021, at 00:52, Charlie England ceengland7@gmail.com <flyrotary@=
lancaironline.net> wrote:
>=20
> =EF=BB=BFHey Le Roux,
> I think your iphone ate your homework. ;-)
> Part of the message seems to be missing.
>=20
> Charlie
>=20
>> On 4/1/2021 4:35 PM, Le Roux Breytenbach breytenbachleroux@gmail.com wrot=
e:
>> Check this thread about intake runner lenght,anwers on a lott of 13B engi=
nes and intake runner lenght and
>>=20
>> Sent from my iPhone
>> Le Roux Breytenbach
>>=20
>>>> On 01 Apr 2021, at 19:23, Charlie England ceengland7@gmail.com <flyrota=
ry@lancaironline.net> wrote:
>>>=20
>>> =EF=BB=BF4 port or 6 port? It's been a long time since I had the manifol=
d off the engine, but I *think* my 4 port engine has same size pri & sec por=
ts. I know I used the same size tubing to make the manifold. I believe that t=
he '3rdary' ports on a 6 port are smaller, but I think Steve Boese found tha=
t they don't do anything at our more reasonable rpms.
>>>=20
>>> Charlie
>>>=20
>>>> On 4/1/2021 12:05 PM, Finn Lassen finn.lassen@verizon.net wrote:
>>>> Thanks Ed.
>>>>=20
>>>> What I meant to say is that Tracy implied that secondary runners should=
 have a larger diameter.
>>>>=20
>>>> But I made them the same (inside diameter) as the holes in the block (3=
0 mm).
>>>>=20
>>>> Finn
>>>>=20
>>>>> On 4/1/2021 11:07 AM, eanderson@carolina.rr.com wrote:
>>>>> Smaller dia may mean that airflow velocity is higher than in the prima=
ries and since the secondary valves open at higher rpms, the higher airflow v=
elocity may help stuff more air into the chamber give the shorter duration t=
he port is open at higher rpm.  Just a WAG.
>>>>>=20
>>>>> Ed
>>>>>=20
>>>>> ------ Original Message ------
>>>>> From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.n=
et>
>>>>> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
>>>>> Sent: 4/1/2021 8:48:31 AM
>>>>> Subject: [FlyRotary] Re: MISTRAL
>>>>>=20
>>>>>> Tracy remarked on my secondary runners being smaller diameter than pr=
imaries and now I see the same here.
>>>>>>=20
>>>>>> If I recall correctly, when I calculated the area of the secondaries v=
s the area of the primaries (in the engine block) I got smaller secondaries t=
han primaries.
>>>>>>=20
>>>>>> What gives?
>>>>>>=20
>>>>>> Finn
>>>>>>=20
>>>>>> On 3/31/2021 9:44 PM, Kelly Troyer keltro@gmail.com wrote:
>>>>>>> Primary Runner length approximately........24 inches
>>>>>>> Primary Runner "OD"  approximately.........1.40 inches
>>>>>>> Secondary Runner length approximately.....24 inches
>>>>>>> Secondary Runner "OD" approximately.......1.66 inches
>>>>>>=20
>=20
>=20
> --=20
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>=20
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