Cozylover Posted July 10, 2003 Share Posted July 10, 2003 Hi Cozyflyers and builders, I've a COZY with the good old Lycoming O-235-C2A... I seem to have absolutely no problem with OIL TEMPS, in the colder climates my engine in running a bit on the "cold" side, cruising at FL100 (10000ft PA for you US guys..., my Oil temps stabilize around 150 to 155°F. That is with an OAT of about 0°C or 32°F. I would rather see them in the neighbourhood of 170 to 180°F. My Cozy has a NACA Oil cooler scoop installed on the right side which is connected to a 2 1/4 inch SCAT duct. I'm wondering if anybody ever had the same problem and if it would be possible to install kind of a valve in the SCAT duct to reduce the cooling airflow over the Oil cooler. I'm thinking of a valve which maybe can be manually adjusted for cold and hot weather operations... If this is a good solution...., which valve would you use? Looked in the Aircraft Spruce Cat. and couldn't find any... Hope this is clear enough, anyway I include a couple of pictures to make it more clear if needed. Thanks for your usual help, Enjoy the summer flying and/or building.... Cozylover, BJORN Quote Flying was my first love and it will be my last one! Link to comment Share on other sites More sharing options...
Cozylover Posted July 10, 2003 Author Share Posted July 10, 2003 Sorry guys, Promised pictures were were too large...reduced them and will try to post them here and below... Regards, BJORN Quote Flying was my first love and it will be my last one! Link to comment Share on other sites More sharing options...
Cozylover Posted July 10, 2003 Author Share Posted July 10, 2003 And a pic from the outside...., BJORN Quote Flying was my first love and it will be my last one! Link to comment Share on other sites More sharing options...
John Slade Posted July 10, 2003 Share Posted July 10, 2003 Very interesting, BJORN. Less power = less heat, so an O-235 would be expected to run cooler than the 0-360 that most are using. Those scoops look good, and fairly easy to do. I'm thinking that I might need something similar, so I'm interested to hear that it works well. What sort of cruise speeds do you get? As for closing the scoops, it might be easier to close off the exit from the oil cooler. If you close the exit, the air will "bounce off" the input. Quote I can be reached on the "other" forum http://canardaviationforum.dmt.net Link to comment Share on other sites More sharing options...
dust Posted July 10, 2003 Share Posted July 10, 2003 how about an adjustable floor in the naca scoop Quote maker wood dust and shavings - foam and fiberglass dust and one day a cozy will pop out, enjoying the build i can be reached at http://www.canardcommunity.com/ Link to comment Share on other sites More sharing options...
Cozylover Posted July 11, 2003 Author Share Posted July 11, 2003 Hi John, Yes the OIL cooling seems to work too good actually... With the European summer now, it's fine, but in a couple of months it will run again on the cold side. The scoop was made by the builder (not myself) before the aircraft first flew, so hard to compare Performance with or without. At 8000ft wide open throttle (2800RPM) I get a TAS of 150KTS or 173MPH. At 12000ft wide open throttle (RPM 2680) I get 146KTS or 168MPH. I guess I loose quite a bit of cruise performance with the VG's installed on the GU Canard. I think it's reducing top speed with about 10MPH. But on the other hand it lowers the approach speed by about 10MPH as well. My approach speed (average weight) is 70KTS, to touchdown around 62KTS or so. John, how would you close of the exit of the Oil cooler...? My installing some ALU behind it or so...? Wouldn't it be easier to put kind of a air-blocking valve in the SCAT tube? Just wondering if somebody on this forum has ever done a similar job... All comment more than welcome.... COZYLOVER... Björn:confused: Quote Flying was my first love and it will be my last one! Link to comment Share on other sites More sharing options...
mplafleur Posted July 11, 2003 Share Posted July 11, 2003 It looks like a perfect spot for some sort of butterfly valve. Quote Mike LaFLeur - Cozy MkIV #1155N68ML Link to comment Share on other sites More sharing options...
John Slade Posted July 11, 2003 Share Posted July 11, 2003 Thanks for the speed info, Björn Yes. A butterfly valve in the inlet would probably be the easiest. The adjustable NACA floor would be better for drag. I did this with my cockpit cooling NACAs, but it looks as though your NACAs are on a curved surface that wouldnt close off easily. Quote I can be reached on the "other" forum http://canardaviationforum.dmt.net Link to comment Share on other sites More sharing options...
Cozylover Posted July 11, 2003 Author Share Posted July 11, 2003 Yes mplafleur..., that's what I was thinking as well. Any idea where to look for a butterfly valve that would fit...? Can't find it with Spruce... Suggestions? Would you place it in the SCAT tube or before that by blocking the inlet itself...? Thanks for your comment, Cozylover Björn:) Quote Flying was my first love and it will be my last one! Link to comment Share on other sites More sharing options...
mplafleur Posted July 11, 2003 Share Posted July 11, 2003 I'd go to an auto salvage yard and get one off a carb. Well, there are probably pros and cons to each. One of course is ease of installation and routing of the cable. Would placing one in the entry be a candidate for icing or corrosion? Putting one at the exit will be in a warmer and possbly more frendly environment and easier to install. Quote Mike LaFLeur - Cozy MkIV #1155N68ML Link to comment Share on other sites More sharing options...
dust Posted July 11, 2003 Share Posted July 11, 2003 if you don't take all of the air the naca scoop pulls in you will create a preasure wave at the scoop. I think making an adjustable scoop floor would be quite easy, especially if you don't make it adjustable from the pilot seat. Just cover the bottom and sides of the scoop with plastic tape and wax it. Lay up 5 layers of bid and you have a perfect floor. Hinge it at the front and figure out how to change the floor position, maybe just a simple wedge under it that slides to put the floor at diferent positions. A winter and a summer position might work. Enjoy the build Quote maker wood dust and shavings - foam and fiberglass dust and one day a cozy will pop out, enjoying the build i can be reached at http://www.canardcommunity.com/ Link to comment Share on other sites More sharing options...
Wayne Hicks Posted July 11, 2003 Share Posted July 11, 2003 You might want to talk with Vance Atkinson and hear from him all the pros and cons with installing a variable NACA scoop. He has a variable door on his scoop. It required a much stronger actuator than one might think. His was not a trivial solution. His experiences and his plans are well-documented in the Central States Newsletters. Contact Terry Schubert to join and to obtain the back issues. ========== Wayne Hicks Quote Wayne Hicks Cozy IV Plans #678 http://www.ez.org/pages/waynehicks Link to comment Share on other sites More sharing options...
Cozylover Posted July 11, 2003 Author Share Posted July 11, 2003 Thansk Wayne and Dust for your advice. I'm subscribed to the CSA newsletters. Have them since JAN99, issue 53. Any idea in what newsletter Vance his set up was explained? I searched but can't find it.... Thanks guys, Cozylover Björn Quote Flying was my first love and it will be my last one! Link to comment Share on other sites More sharing options...
Richard Schubert Posted July 11, 2003 Share Posted July 11, 2003 The variable NACA scoop is in volume 23, July 1991 of the CSA newsletter. I believe back issues are available from CSA editor Terry Schubert(no relation)all the way back to 1990. You want to get them all. Quote "We choose to do these things not because they are easy, but because they are hard." JFK Link to comment Share on other sites More sharing options...
chuckthedog Posted August 3, 2003 Share Posted August 3, 2003 Just a thought. Could you put a ball valve in the oil line to the cooler? That way you could turn it off in winter. The travel is only 90 degrees on the stem from full off to full on. Quote If the phone don't ring. It's me Link to comment Share on other sites More sharing options...
Cozylover Posted August 11, 2003 Author Share Posted August 11, 2003 After consulting some Northern European canardiens, I will initially just try to remove the SCAT duct going to the Oil Cooler and leave the Naca scoop open... This should make the air go more around it, without cooling too much. Will do it somewhere next OCT, when the temps come down. Keep you informed, COZYLOVER, Björn flybjorn@emirates.net.ae Quote Flying was my first love and it will be my last one! Link to comment Share on other sites More sharing options...
Juan Rivera Posted February 23, 2005 Share Posted February 23, 2005 Do you have the vernatherm valve installed? If the vernatherm valve is working the oil will not go to the cooler untill its 170F or higher. Quote Link to comment Share on other sites More sharing options...
dustind Posted June 27, 2005 Share Posted June 27, 2005 The lip looks like it sticks up into the airstream. You may be able to reduce drag by making it more flush with the cowl lines. Quote Link to comment Share on other sites More sharing options...
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