Viking 130 Cowl Modifications - Zenith Aircraft Builders and Flyers2024-03-28T20:55:05Zhttps://zenith.aero/forum/topics/viking-130-cowl-modifications?feed=yes&xn_auth=noI believe most aircraft using…tag:zenith.aero,2019-11-18:2606393:Comment:7006192019-11-18T04:08:51.137ZLoren Warnerhttps://zenith.aero/profile/LorenWarner
<p>I believe most aircraft using the Viking 130 do not have as much drag as a 750 STOL, and therefore they should have better extended climb performance before seeing high temperatures. Our 750 has excellent STOL performance, but we're also looking for better extended climbs. <br></br><br></br>As you can see from our earlier pictures, all air to our radiator had to flow around the flywheel and through the cowl. Our new modification completely bypasses the cowl to allow an unobstructed high pressure…</p>
<p>I believe most aircraft using the Viking 130 do not have as much drag as a 750 STOL, and therefore they should have better extended climb performance before seeing high temperatures. Our 750 has excellent STOL performance, but we're also looking for better extended climbs. <br/><br/>As you can see from our earlier pictures, all air to our radiator had to flow around the flywheel and through the cowl. Our new modification completely bypasses the cowl to allow an unobstructed high pressure area to the radiator. By the way, our radiator outlet louvers do face aft. <br/><br/> <br/><br/></p> Loren,
Thanks. I clicked…tag:zenith.aero,2019-11-18:2606393:Comment:7004292019-11-18T00:18:27.169Zcharlie rosenzweighttps://zenith.aero/profile/charlierosenzweig
<p>Loren,</p>
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<p>Thanks. I clicked on the link and as luck would have it, the laptop I was using still had my wife's FB account so it opened it under her log in. </p>
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<p>I am not a Zenith builder. And I am no expert, but it seems from what I have read, the exit of a coolant plenum, is as important as the inlet. Most other aircraft have the outlet, or exits in a negative pressure location. So it just seems that the outflow of this design where it is 90 degrees agains the…</p>
<p>Loren,</p>
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<p>Thanks. I clicked on the link and as luck would have it, the laptop I was using still had my wife's FB account so it opened it under her log in. </p>
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<p>I am not a Zenith builder. And I am no expert, but it seems from what I have read, the exit of a coolant plenum, is as important as the inlet. Most other aircraft have the outlet, or exits in a negative pressure location. So it just seems that the outflow of this design where it is 90 degrees agains the airstream is a challenge right from the beginning. But I know that some who have this set up, report no issues with the cooling, but others struggle. </p>
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<p>On my RV6A I followed a radiator plenum that others have had success with where the inlet is in a positive pressure area, and the exit is in a negative pressure area, and the exit is larger than the inlet. But...I am not flying yet so I cannot report how well it does or does not work. But I can tell you that even with just the prop flow over the radiator, that I can run the engine at 20" of MAP with no over heating at all, just sitting on the ground. </p>
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<p>If I had a set up like yours, I would be tempted to refplace your Louvers with an exit in a negative pressure area, by way of having the opening facing rearward. I bet it would not have to be large at all. The width you have and probably only 2-1/2" tall would probably do well. And yes the large opening in front of the flywheel, probably counter productive. The inlet below the cowl by itself is more than large enough without the air from inside the cowl. Just my 2 cents. </p>
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<p>Charlie </p> https://www.facebook.com/Expe…tag:zenith.aero,2019-11-17:2606393:Comment:7002982019-11-17T19:05:58.462ZLoren Warnerhttps://zenith.aero/profile/LorenWarner
<p><a href="https://www.facebook.com/Experimental750ES/" target="_blank">https://www.facebook.com/Experimental750ES/</a></p>
<p><a href="https://www.facebook.com/Experimental750ES/" target="_blank">https://www.facebook.com/Experimental750ES/</a></p> send me a link and Ill try..…tag:zenith.aero,2019-11-17:2606393:Comment:7005892019-11-17T06:47:14.113Zcharlie rosenzweighttps://zenith.aero/profile/charlierosenzweig
<p>send me a link and Ill try.....</p>
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<p>Charlie </p>
<p>send me a link and Ill try.....</p>
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<p>Charlie </p> We have an abundance of infor…tag:zenith.aero,2019-11-15:2606393:Comment:7003782019-11-15T04:30:58.207ZLoren Warnerhttps://zenith.aero/profile/LorenWarner
<p>We have an abundance of information on our facebook page. I thought you could still view facebook posts without being a member? </p>
<p>We have an abundance of information on our facebook page. I thought you could still view facebook posts without being a member? </p> loren
Thanks for sharing thi…tag:zenith.aero,2019-11-15:2606393:Comment:7004962019-11-15T03:29:10.415Zcharlie rosenzweighttps://zenith.aero/profile/charlierosenzweig
<p>loren</p>
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<p>Thanks for sharing this. Based on what you and Jonathan have shared there seems to be some real value in working out a good solution for cooling with this engine and cowling combo. I was wondering based on the picture, the opening of the radiator school is not larger than the outlet is it? I dont have FB so be able to see the other pics.....</p>
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<p>I might be worth setting up a pressure ga to the inlet of the radiator scoop to see how much air you are…</p>
<p>loren</p>
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<p>Thanks for sharing this. Based on what you and Jonathan have shared there seems to be some real value in working out a good solution for cooling with this engine and cowling combo. I was wondering based on the picture, the opening of the radiator school is not larger than the outlet is it? I dont have FB so be able to see the other pics.....</p>
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<p>I might be worth setting up a pressure ga to the inlet of the radiator scoop to see how much air you are actually getting in to that. </p>
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<p>Either way, thanks for sharing, I look forward to hearing more about your trials and solutions, good or bad...</p>
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<p>Charlie </p> More photos of this mod may b…tag:zenith.aero,2019-11-06:2606393:Comment:6990252019-11-06T23:53:16.202ZLoren Warnerhttps://zenith.aero/profile/LorenWarner
<p>More photos of this mod may be viewed at facebook Experimental 750ES</p>
<p>More photos of this mod may be viewed at facebook Experimental 750ES</p>