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#21
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I think a better comparison is a car heater. It utilizes the
antifreeze and operates below boiling temperatures. I would think that the oil temps would be greater than the water temps. I would assume that at some point the oil will be hot enough to flow through the oil cooler and not bypass the oil cooler. So as long as fresh air is used to cool the oil cooler, the heat could be directed into the cabin with an air bypass on the egress side of the oil cooler. Or a second oil cooler could be installed in the cabin with a heater box that could open or close an air vent. I agree with the concern of running the air past the muffler. For that reason I disconnect the air duct from the muffler to the heater system. In the areas that I fly it does not get cold. Exhaust heaters are beyond my margins for safety. Steve On Wed, 27 Oct 2004 09:17:19 -0400, Todd Pattist wrote: (Ulrich Neumann) wrote: Not quite so, Ian. The oil cooler would always be cooling the oil, just what you do with the warm air downstream from it is the issue. A simple vane valve diverts the warm air either into the cabine or out into the atmosphere. Simple and light-weight! Not so simple or light. Oil runs at a far lower max temp than exhaust. It's also far more viscous, especially when cold. To get comparable heat transfer you would need to provide much more surface area than an exhaust muff. That means more weight. You'd probably need to run the oil through a heat exchanger, which means forcing viscous oil through small diameter heat exchanger tubes. Of course, you can't do that until the oil is hot, so you'd probably need a bypass system and you've got to be careful not to block up the heat exchanger tubes, stop oil flow and blow the engine. Todd Pattist - "WH" Ventus C (Remove DONTSPAMME from address to email reply.) |
#22
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Exhaust heaters are beyond my margins for safety. Which is why the Sylane that I own (a small piece of) has a very good electronic Carbon Monoxide dectector. Tony V |
#23
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Do these motors have generators or alternators of some sort? An
electrically heated seat (think heating pad) might not be a bad idea. |
#24
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But I get cold feet at the thought of sitting in the
hot seat.. Ian At 20:06 27 October 2004, Nafod40 wrote: Do these motors have generators or alternators of some sort? An electrically heated seat (think heating pad) might not be a bad idea. |
#25
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"Do these motors have generators or alternators of some sort? An
electrically heated seat (think heating pad) might not be a bad idea." Electric heating is inefficient. Any energy used in heating a seat would directly subtract from energy available for a climb. 10 amperes would provide 100 watts of electric seat heating, however that is the easiest part of the body to insulate without additional heat. Although this thread seems to fear heat from the exhaust system, most of the small aircraft use this method and FAA statistics indicate that it is the cause of only a small percentage of the accidents. It is even less likely to occur on a new exhaust manifold. A simple carbon monoxide detector can alleviate concerns over this danger. My motorglider gets cabin heat over the exhaust and that is a small concern. My biggest concern is the person sitting in the front seat, as statistics generally point to them as the weak link. Colin N12HS --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.783 / Virus Database: 529 - Release Date: 10/25/04 |
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