406PIlot Nice clean install!
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Made a big push yesterday and today to get things finalized and finished up.
Here are a few pics.
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Can't forget I started the engine for the first time today!!
Here is a little clip.
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Sounds awesome!!Comment
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Oh the SWEEEET sound of a multi-cylinder radial engine.Originally posted by 406PIlot View Post
Your equipment install looks clean and tidy, WELL DONE.
D-Day is drawing closer now. We are all rooting for you.
DaleD
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Appreciate the comments. I only ran it for all of 2 minutes today. Just enough to start it richen up the mixture and that was about it... Still needs to run a tank or two thru it for break in before it goes in the air. Hoping the weather co-operates so I can do the break in this weekend. If you watch closely you can see a bit of snow fall during my initial start up today. I should of waited till nicer weather but couldn't resist getting that initial start up done.Comment
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Anyone put a smoker in their’s?Comment
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I wanted to get a few flights on the plane get comfortable and make sure the engine was dialed in before really considering a smoke system. It has crossed my mind. So I would also love to hear if people have and or what system they are using etc.Originally posted by RCBobP View PostComment
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I got a tank of fuel through the engine today. Hoping to get another run through it tomorrow. Then I'll dial in the carb and get it in the air if all goes well.
I'm more excited the closer I get to the maiden!!!!!Comment
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I wanted to ask and see what people think of needing or using baffles in the cowl. Since the cowl is so big and the engine has a lot of open space around it does anyone think that baffles will be needed to make sure the air is directed over the cylinder cooling fins? I've seen on different searches some people mention they are a must if you have a big open cowl and i've seen others say they aren't required.
I've found most of the best information comes from the people on this forum. I'm curious to see what your thoughts are on this.
Thanks.Comment
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Every RC pilot that I respect, when say flying a Yak or other round cowl plane with something big like a a DA120-150-170-200, always recommend baffles. This is in regards to my years with 3D Hobby Shop/Extreme Flight and flying IMAC pretty seriously for several years. I even baffled my DA170 in an Extra. It wasn't much more work to help avoid an overheating problem when I invest a whole weekend at a contest.
I believe that most of this thinking is to help with an investment in a very expensive model (and engine). Why assume you're getting proper airflow over the heads when you can absolutely make sure you are? I have also known respected pilots who measure temps before and after and noticed a huge increase in cooling when baffling.
Here's the thing, with a big open cowl...unless you a fluid dynamics expert, it's really tough to understand where the air is going to flow. You would think if everything is out in the open, you're going to get airflow. That's not always the case. You can absolutely have stagnant air just around the heads during flight which means no cooling. The guys at DA recommend to absolutely never fly without a cowl.
My suggestion...baffle. IF you don't baffle, please pay attention to your engine and see if you need to down the road. The ONLY bad thing that can come from baffling is the time it takes to do it.
Just my 2 cents.
Originally posted by 406PIlot View PostComment
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djmoose thanks for the info. I do a decent job of checking engine temps before and after flights on my other planes. But I think like you do if its only a little time and effort why not doing to protect the investment!!!
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I was going to suggest you use 3 pieces of craft foam and throw in some thin CF rods to support it. However, you could try to use the fake motor, see if you can orient it so you can just cut out spots for your 3 cylinders...paint the fake cylinders to match. <thinking out loud>
Originally posted by 406PIlot View PostComment
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djmoose So i have been doing my break-in without a cowl. I am now through 2 complete tanks of fuel with break-in settings (super rich). I've started my 3rd tank of fuel and have adjusted the carb to more of a normal running setting up but still on the "rich" side. With the normal / rich running settings my cylinder head temps have been between 160-185/190 ish. Do you think these temps will change drastically during flight with the cowl on? Up to this point I've run my gas planes with no cowl for the first flight or two to make carb adjustments from rich to a more normal running setup. But this is my first multi cylinder 4 stroke so I am looking for any / all advise!
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406PIlot Their are several world class scale pilots that have been flying 3, 5, and 7 cylinder radials, up to 500cc, in open air without any issues.
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There are builders of both the Black Horse Zero and Black Horse FW-190 that have installed 4-stroke radials inside the cowls. None have baffling.
The Gilmore has even more space inside the cowl and very good air outflow. Four cycle engines tend to run cooler as they fire half as often as well.
One way to test might be to run it open and take temp readings. Then run with the cowl installed and take readings again as the engine is still pretty accessible.Comment
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