X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=G+5i7Os5 c=1 sm=1 tr=0 a=FWs08y4tOuPg3jRfaxvtnw==:117 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=x7bEGLp0ZPQA:10 a=ad1WmcueCrwA:10 a=J70Eh1EUuV4A:10 a=3oc9M9_CAAAA:8 a=Ia-xEzejAAAA:8 a=pGLkceISAAAA:8 a=hOpmn2quAAAA:8 a=7g1VtSJxAAAA:8 a=YT9Sfs_wXqRIFAKQQNoA:9 a=QEXdDO2ut3YA:10 a=Qa1je4BO31QA:10 a=gvSQh4r-fQ0A:10 a=7AACna36XDV09ZZHt6wA:9 a=5BouaoIjl-80HKGu:21 a=Urk15JJjZg1Xo0ryW_k8:22 a=GyA-uvUxXSCciAkwuKQO:22 a=grOzbf7U_OpcSX4AJOnl:22 From: "William Jepson wrjjrs@gmail.com" Received: from mail-ed1-f43.google.com ([209.85.208.43] verified) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 12931322 for flyrotary@lancaironline.net; Fri, 06 Sep 2019 13:58:32 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.208.43; envelope-from=wrjjrs@gmail.com Received: by mail-ed1-f43.google.com with SMTP id f2so699429edw.3 for ; Fri, 06 Sep 2019 10:58:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=kaHO32qSRmOuH4STGbib2BFoI3hXffHcMy/zjrbaUZ8=; b=czPzAM2lQQFe1PReuRvnL/aEynMW8CjnzGGX50jHeeUjgLJUVI1kKzWoOZsyvaamvA +2KFbkmnJysqvqLexIkgNPZFpKuIYxD7YVKO7ECaRgs9Vbz3V+y/rOhoBjCUfCsiET3l ftOFHOZSPX2K5zXBs4FopP+Zo8wJBYnQmqmXIRDLcGhJvZVk3Z+qiWcTzYScXI4JWoOm zzja47xJ9io86GG0uXP0uyiG43KuV28phsbw0NbfRYoec/Qr2wV+KCRQje8pNChqJCCg rqltkAdzGVOKKvf3GZTiREsANaLiYP07APL5msl4i+SwcG9fyEr1Wjci4XGa6USTSMKP aueg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=kaHO32qSRmOuH4STGbib2BFoI3hXffHcMy/zjrbaUZ8=; b=d86/89vugE+IF7sKjMkUdrCODfTCgU6ZEntpBXlSB5etVnp4Uls6svraS41a1JHLFQ dqPMcZFLqRBj2k5Sp26TCohv6QhoLsxb0Jkau3zsXpGiAPYq2026nHusn9Qyn3MMiaj7 8Sh8Pv6+qmdHSp396+K6VigVZiHzvIa/JE1WFZ64+VYb+QCYFAtqNWsvBBvzevW3Wpc1 AIvCZpahjyGHRimf6SNVsEM8cjiKsAnKcisx2tURYSjwuFvRUHPrC9Hs7B8NkrfnZz75 hJdP+AH/DyVXY70JJLsJZdN4aKrWjp5Q84oBdjDwvoOBxQERYbgHa2HrasnDXk8pUwGh 5/Zg== X-Gm-Message-State: APjAAAWO4rM+BVCuQrz8NeRfy+PhaAlGdTFMbotfjkhwm6Y9AJF4QaJ1 Z0nAYeb4Cx9u2KkJiiK8Hordlvzb8rWbHanX+14b5w== X-Google-Smtp-Source: APXvYqy3Tg3fNXRadk4NlhHfARYQZB8RP8ywZlCEz0bSH+0baEF7QtfU1AGFrUCaHWVm+IqpDqvSnclz9wf1zC3tBXw= X-Received: by 2002:a50:ad2c:: with SMTP id y41mr10979289edc.114.1567792694598; Fri, 06 Sep 2019 10:58:14 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Fri, 6 Sep 2019 10:58:03 -0700 Message-ID: Subject: Re: [FlyRotary] Re: Part specs-radiator design To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="000000000000a49e6f0591e62e93" --000000000000a49e6f0591e62e93 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Rich. I said =E2=80=9Cif the airflow is there=E2=80=9D. The question I was = answering was about the angle of the heat exchanger. We do need to be sure we don=E2=80= =99t trap air inside, and of course that there is actual airflow through. Many of our rotary installs would be helped by using manometers to check if the area behind the radiators are lower pressure. Motorcycles are another =E2=80=9Cs= pecial case=E2=80=9D since most require the air to turn 90 degrees to exit the fai= ring. The only really excellent design on bikes was the Britten. I raced motorcycles in the past and the only different configuration I saw was the Honda RC 51. ( if I have the right number) with both radiators in the cheek position in the fairing. Bill Jepson On Fri, Sep 6, 2019 at 10:44 AM A R Goldman argoldman@aol.com < flyrotary@lancaironline.net> wrote: > Not totally true as I learned from overheating my norton rotary dragonfly= . > It makes sense that air flows from high pressure to low. But. Many times = oh > has a mind of its own counterintuitively. For example as the air exit the > exchanger if it is not allowed to exit straight or gently deflected, > independent of the delta the air will stagnate and not go where you expec= t. > Pay as much attention to the exit as you do with the entry > > Yrmv > > Rich > > Sent from my iPhone > > On Sep 6, 2019, at 11:52 AM, William Jepson wrjjrs@gmail.com < > flyrotary@lancaironline.net> wrote: > > Answer is nothing; provided the airflow is there. Also there needs to be = a > vent or tap to get all the air out of the inside. > Bill Jepson > > On Fri, Sep 6, 2019 at 8:38 AM Marc Wiese cardmarc@charter.net < > flyrotary@lancaironline.net> wrote: > >> Finn asks- >> "BTW, what happens when you lay down (at a 20 degree) angle a radiator >> that is designed to be upright?" >> >> I always wondered about that myself. The stock FD (3rd gen) radiator has >> to be at about a 45 degree angle (?) to the incoming airstream. And it h= as >> 2 "supplemental" staged electric fans (no pump fan), one is always on if >> the AC is on, the fans have different blades and different speeds >> controlled by ECU and temp sensor. I suppose the fins are canted or perh= aps >> they are best tilted to airflow to create turbulence and help remove som= e >> heat..........don't know much about radiator design............ >> MW >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: >> http://mail.lancaironline.net:81/lists/flyrotary/List.html >> >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: >> http://mail.lancaironline.net:81/lists/flyrotary/List.html >> > --000000000000a49e6f0591e62e93 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Rich. I said =E2=80=9Cif the airflow is there=E2=80= =9D. The question I was answering was about the angle of the heat exchanger= . We do need to be sure we don=E2=80=99t trap air inside, and of course tha= t there is actual airflow through. Many of our rotary installs would be hel= ped by using manometers to check if the area behind the radiators are lower= pressure. Motorcycles are another =E2=80=9Cspecial case=E2=80=9D since mos= t require the air to turn 90 degrees to exit the fairing. The only really e= xcellent design on bikes was the Britten. I raced motorcycles in the past a= nd the only different configuration I saw was the Honda RC 51. ( if I have = the right number) with both radiators in the cheek position in the fairing.=
Bill Jepson

On Fri, Sep 6, 2019 at 10:44 = AM A R Goldman argoldman@aol.com &= lt;flyrotary@lancaironline.n= et> wrote:
Not totally true as I learned from overheating my norton rotary dragonfly.= It makes sense that air flows from high pressure to low. But. Many times o= h has a mind of its own counterintuitively. For example as the air exit the= exchanger if it is not allowed to exit straight or gently deflected, indep= endent of the delta the air will stagnate and not go where you expect. Pay = as much attention to the exit as you do with the entry

Y= rmv

Rich

Sent from my iPhone

On Sep 6, 2019, at 11:52 AM, William Je= pson wrjjrs@gmail.com= <f= lyrotary@lancaironline.net> wrote:

Answer is nothing; provided t= he airflow is there. Also there needs to be a vent or tap to get all the ai= r out of the inside.
Bill Jepson=C2=A0

On = Fri, Sep 6, 2019 at 8:38 AM Marc Wiese cardmarc@charter.net <flyrotary@lancaironline.net>= ; wrote:
Finn asks-
"BTW, what happens when you lay down (at a 20 degree) angle a radiator= that is designed to be upright?"

I always wondered about that myself. The stock FD (3rd gen) radiator has to= be at about a 45 degree angle (?) to the incoming airstream. And it has 2 = "supplemental" staged electric fans (no pump fan), one is always = on if the AC is on, the fans have different blades and different speeds con= trolled by ECU and temp sensor. I suppose the fins are canted or perhaps th= ey are best tilted to airflow to create turbulence and help remove some hea= t..........don't know much about radiator design............
MW

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