Cozy1200 Posted July 12, 2008 Share Posted July 12, 2008 I didn't like the idea of hand sanding the NACA inlet foam flat. So I built a simple jig and leveled it with a router. There's a video on my website showing the technique. It's 4 minutes and about 10 meg. http://www.cozy1200.com/geeklog/article.php?story=LevelRouter or http://tinyurl.com/5dttbr Quote Drew Chaplin (aka the Foam Whisperer) --- www.Cozy1200.com - I'm a builder now! --- Brace for impact... Link to comment Share on other sites More sharing options...
WileEZ Posted July 12, 2008 Share Posted July 12, 2008 Great video! Would it be difficult to add a shopvac to the jig? Quote WileEZ "All of my ideas are suspect until proven otherwise!" Link to comment Share on other sites More sharing options...
Cozy1200 Posted July 12, 2008 Author Share Posted July 12, 2008 Sure, it could be added. Some routers have attachments included. I just wanted to keep the jig simple and cheep. Quote Drew Chaplin (aka the Foam Whisperer) --- www.Cozy1200.com - I'm a builder now! --- Brace for impact... Link to comment Share on other sites More sharing options...
steve Posted July 12, 2008 Share Posted July 12, 2008 I didn't like the idea of hand sanding the NACA inlet foam flat. So I built a simple jig and leveled it with a router. There's a video on my website showing the technique. It's 4 minutes and about 10 meg. http://www.cozy1200.com/geeklog/article.php?story=LevelRouter or http://tinyurl.com/5dttbr i love it, gr8 job Quote Steve M. Parkins Link to comment Share on other sites More sharing options...
airnico Posted July 12, 2008 Share Posted July 12, 2008 hello guys, I'm wondering:confused: about the right size of a naca inlet to feed my engine and actually I'm finding that a naca scoop is not just a scoop, there is a lot of math behind it. this guy http://www.melmoth2.com/texts/NACA%20inlet%20sizing.htm is feeding his IO360 with a 4 inches scoop: his math seems to be reasonably but the scoop seems(to me) to be very small, what do you think about it? Quote Roads? Where we're going we don't need roads. (Dr. Emmett Brown) Link to comment Share on other sites More sharing options...
TMann Posted July 12, 2008 Share Posted July 12, 2008 That should be sufficient as an air intake feeding to the intake manifold. An inch larger would not hurt. Drew, I used a router when I shaped my fuselage floor. I had drawn a sort of topographical map in 1/4 inch increments and then cut them out adjusting the depth of cut for each station. I then came back with the Fein fitted with the flush cut blade and did the large blend between levels that way, The rest was done by sanding. ...... so how long until you get your own show on the DIY network? Quote T Mann - Loooong-EZ/20B Infinity R/G Chpts 18 Velocity/RG N951TM Mann's Airplane Factory We add rocket's to everything! 4, 5, 6, 7, 8. 9, 10, 14, 19, 20 Done Link to comment Share on other sites More sharing options...
Cozy1200 Posted July 13, 2008 Author Share Posted July 13, 2008 I'm wondering:confused: about the right size of a naca inlet to feed my engine and actually I'm finding that a naca scoop is not just a scoop, If you're an EAA member, log in and download this old article. http://members.eaa.org/home/saarchive/eaa_articles/013583.pdf December 1991 I stuck with the plans version. Quote Drew Chaplin (aka the Foam Whisperer) --- www.Cozy1200.com - I'm a builder now! --- Brace for impact... Link to comment Share on other sites More sharing options...
Lynn Erickson Posted July 13, 2008 Share Posted July 13, 2008 That should be sufficient as an air intake feeding to the intake manifold. An inch larger would not hurt. but it could hurt a lot more then you think. when a scoop is sized right there is smooth air flow and little drag. when a scoop is to big for the air flow there will be spill over and backed up airflow which will effect the air flow and pressure that goes into the scoop. it can even reduce the air flow below the required amount. Quote Evolultion Eze RG -a two place side by side-200 Knots on 200 HP. A&P / pilot for over 30 years Link to comment Share on other sites More sharing options...
Cozy1200 Posted July 13, 2008 Author Share Posted July 13, 2008 ...... so how long until you get your own show on the DIY network? Me on my own show? Forget it, I want to fly someday. The actual routing probably only took 30 minutes. But because I filmed it, it took an entire evening. Then probably another 6 hours to edit. It's not a good way to make progress on my plane. I figure a couple of these a year is not going to set me back too far. They're kind of fun to make. Quote Drew Chaplin (aka the Foam Whisperer) --- www.Cozy1200.com - I'm a builder now! --- Brace for impact... Link to comment Share on other sites More sharing options...
airnico Posted July 13, 2008 Share Posted July 13, 2008 but it could hurt a lot more then you think. when a scoop is sized right there is smooth air flow and little drag. when a scoop is to big for the air flow there will be spill over and backed up airflow which will effect the air flow and pressure that goes into the scoop. it can even reduce the air flow below the required amount. this is exactly the problem I was referring to: to build a good shaped naca inlet is not a huge problem, you can find detailed documents from NACA aerodynamic research made in 1948/50(required lenght, depth, lip and so on). matching the engine air flow requirement to the naca recovery ability is a bit more difficult for me. the guy with the IO360 has his inlet behind the prop, mine is on the other side..... who wants to suggest me?? Quote Roads? Where we're going we don't need roads. (Dr. Emmett Brown) Link to comment Share on other sites More sharing options...
Crazycanuck Posted July 14, 2008 Share Posted July 14, 2008 Wow that was a great video. It is a great method to get a precise finish. Thanks for the tip. Quote Crazy Canuck Toronto, Ontario, Canada Cozy MKIV #MK1536 Link to comment Share on other sites More sharing options...
Phil Kriley Posted July 14, 2008 Share Posted July 14, 2008 Excellent! Too late for me, but maybe there will be other areas where a similar approach can be used. Thanks for taking the time! Quote Phil Kriley Cozy #1460 Chapter 13 - nose Right wing done - working on right winglet. Link to comment Share on other sites More sharing options...
MoneySink Posted July 15, 2008 Share Posted July 15, 2008 Drew, That's awesome! You're a regular Wood Whisperer! (or more like Foam Whisperer) Quote Link to comment Share on other sites More sharing options...
Neverquit Posted July 15, 2008 Share Posted July 15, 2008 Drew, great video! You seem very comfortable in front of the camera. I hear a bit of Aussie accent I didn't hear before. Quote Link to comment Share on other sites More sharing options...
Spodman Posted July 16, 2008 Share Posted July 16, 2008 I hear a bit of Aussie accent Too right mate, belardy oath... Are you trying to subtly tell Drew to include subtitles next time??? Very interesting thanks mate, (and Chasing Mars). I am getting together my order at the moment, and have found a reasonable local source of Divinycell so am actively considering your method, and substituting the PVC. Guess I'll still need the urethane for the spar and nose. Quote Mark Spedding - SpodmanDarraweit Guim - AustraliaCozy IV #1331 - Chapter 09www.mykitlog.com/Spodmanwww.sites.google.com/site/thespodplane/the-spodplane Link to comment Share on other sites More sharing options...
Cozy1200 Posted July 16, 2008 Author Share Posted July 16, 2008 I have no bloody accent. Get stuffed mate. Quote Drew Chaplin (aka the Foam Whisperer) --- www.Cozy1200.com - I'm a builder now! --- Brace for impact... Link to comment Share on other sites More sharing options...
Cozy1200 Posted July 18, 2008 Author Share Posted July 18, 2008 If you trying to find more information on NACA shapes and sizes. Bferrell has a fantastic website with some great XLS modelling. Brett, you website & wiki are awsome. http://wiki.velocityxl.com/index.php?title=Documents#NACA_Ducts Quote Drew Chaplin (aka the Foam Whisperer) --- www.Cozy1200.com - I'm a builder now! --- Brace for impact... Link to comment Share on other sites More sharing options...
ZUCZZ Posted July 18, 2008 Share Posted July 18, 2008 That accent must have been right dinkum strong, because it says the link is no longer available Quote I live in my own little world! but its OK, they know me here! Chris Van Hoof, Johannesburg, South Africa operate from FASY (Baragwanath) Cozy Mk IV, ZU-CZZ, IO-360 (200hp) 70x80 prop Link to comment Share on other sites More sharing options...
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