Return-Path: <13brv3@bellsouth.net> Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2751847 for flyrotary@lancaironline.net; Wed, 19 Nov 2003 15:07:13 -0500 Received: from rad ([66.156.196.17]) by imf20aec.mail.bellsouth.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20031119200707.WSWG14456.imf20aec.mail.bellsouth.net@rad> for ; Wed, 19 Nov 2003 15:07:07 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Core vs Radistor was Re: [FlyRotary] radiator Date: Wed, 19 Nov 2003 14:06:06 -0600 Message-ID: <02c901c3aed8$910ec8a0$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_02CA_01C3AEA6.467458A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_02CA_01C3AEA6.467458A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Rusty, what was the size of your radiator and the final determination = about its adequacy? =20 Ed =20 =20 This is revenge for those engine out comments, isn't it :-) =20 I started with a huge radiator, because it had (alleged) oil coolers in = it. The oil coolers didn't work out, and were bypassed, leaving only water cooling. =20 =20 The rad core width is 17.25, and the length as been changed. Full = length is 24.25" (423 sq in) . The length (not covered) was first tested at = 17.75 " (306 sq in) . The final length (not covered) was 12.625" (218 sq in) . HALF the original radiator. The core is 2.25" thick if anyone is doing = the math . The other thing to consider is that the covered portion of the radiator is only covered on the front side. The back side is open. = While there is no air passing through, turbulent air around the back side will still be removing some heat from the covered section. There is also a = 2" thick oil cooler behind the uncovered area of radiator, so overall, this = is about 4.5" thick. =20 =20 Here is a chart of inlet, rad size, and temps for climb at around 100- = 110 mph. The cheek outlet is fixed at about 66 sq in, and the bottom = opening is about 83 sq in. OAT is ground temp, not in-flight. =20 =20 Date |Inlet (sq in)| Rad core (sq in) | water temp F | oil = temp F | OAT | comments =20 80 | 423 | <180 = (t-stat) | 180 | 80 | bottom outlet open 80 | 306 | <180 = (t-stat) | 180 | 80 | bottom outlet open 10-18 | 48 | 306 | 180 (no t-stat) = | 230 | 75 10-18 | 80 | 218 | 160 (no-t-stat) = | 185 (not max?) | 70 10-19 | 80 | 218 | 160 (no-t-stat) = | 220+ | 80 11-01 | 80 | 218 | 160 (no t-stat) = | 200 | 80 | bottom outlet open=20 =20 My current (changes every week) plan is to go with a core that is still 2.25" thick, but gives me about 300 sq inches of frontal area. That = will be more than I need now, but since I'll be putting the oil cooler in front = of it to lower the oil temps, I'll need more radiator than I do now. =20 =20 One final comment about expensive radiators, I wouldn't buy one, unless = you have a very good reason to believe it will be just what you need. For example, I'll be retiring an $800+ dollar radiator with my rev-2 cowl. =20 =20 Cheers, Rusty ------=_NextPart_000_02CA_01C3AEA6.467458A0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
 Rusty, what was the size of your = radiator and=20 the final determination about its adequacy?
 
Ed
 
 
This is=20 revenge for those engine out comments, isn't it :-)
 
I started=20 with a huge radiator, because it had (alleged) oil coolers in = it.  The=20 oil coolers didn't work out, and were bypassed, leaving only water=20 cooling.   
 

The rad core width is 17.25, and the length as been = changed.  Full length is = 24.25”  (423 sq in) .  The length (not = covered)  was first tested = at 17.75 "   (306 sq in) .  The final length (not covered) = was=20 12.625”  (218 sq = in) .  HALF the original = radiator.  The core is 2.25” thick = if anyone is=20 doing the math .   The=20 other thing to consider is that the covered portion of the radiator is = only=20 covered on the front side.  The back side is open.  While = there is no=20 air passing through, turbulent air around the back side will still be = removing=20 some heat from the covered section.  There is also a 2" thick = oil=20 cooler behind the uncovered area of radiator, so overall, this is = about=20 4.5" thick.   

 

Here is a chart of inlet, rad size, and temps for climb = at around=20 100- 110 mph.   The cheek outlet is fixed at = about 66 sq=20 in,  and the bottom opening = is=20 about 83 sq in.   = OAT is=20 ground temp, not in-flight.   

 

Date    = |Inlet (sq in)|  = Rad core (sq=20 in)  |  water temp F     |  oil temp F         | OAT | = comments

 

           =20  80              | =20 423             &n= bsp;        |  <180 (t-stat)     |  180                    |  80 =20   |  bottom outlet = open

           &n= bsp;=20 80            &n= bsp; | =20 306             &n= bsp;        |  <180 (t-stat)     |  180            &n= bsp;       |  80    |  bottom outlet = open

10-18 | 48            &n= bsp;  | =20 306            &n= bsp;         | =20 180 (no t-stat)  |  230                    |  75

10-18 | 80            &n= bsp;  | =20 218            &n= bsp;         | =20 160 (no-t-stat)  = |  185 (not max?)  | =20 70

10-19 | 80               |  218           &n= bsp;         =20 |  160 = (no-t-stat)  | =20 220+         =20         |  80

11-01 | 80           &n= bsp;  =20 |  218           &n= bsp;         =20 |  160 (no = t-stat)  | =20 200           &n= bsp;        =20 |  80   |  bottom outlet open 

 

My current (changes = every week)=20 plan is to go with a core that is still 2.25" thick, but gives me about = 300 sq=20 inches of frontal area.  That will be more than I need now, but=20 since I'll be putting the oil cooler in front of it to lower the = oil temps,=20 I'll need more radiator than I do = now.  

 

One final comment about = expensive=20 radiators, I wouldn't buy one, unless you have a very good reason to = believe it=20 will be just what you need.  For example, I'll be retiring an $800+ = dollar=20 radiator with my rev-2 cowl. 

 

Cheers,

Rusty

------=_NextPart_000_02CA_01C3AEA6.467458A0--