Neil, I do agree that I'm doing a lot more then I should just to get the plane flying. But I really enjoy working on the plane and trying new things. I'm at the point where I need to stick to a plan and get the plane finshed / flying. My goal is April to be flying.
Bobby, I was struggling trying to find some good math and results for the inlet size. I ended up going with 20% of the core face. I do have one printed at 30% if I need to switch it up. Would only take a few hours to glass now that everything is setup and in the autocad system.
Charlie, try out Fusion 360 by autocad. It's free, and actually not to hard to use. I research on YouTube a lot to figure out how to do things. I'd like to do some college night courses on it down the road. I have not done any 'tuf' tests or yarn. Just before xmas, I was looking at Harbour Freight if they have any good leaf blowers on sale. There are some computer wind tunnel programs to try out, but my brain is already overloaded right now. When I sketched out the truppet shape, I used the Kuchemann and Weber theories to come up with the length and curves. I'll actually try a vacuum cleaner and some yarn and see how it looks for the two corners next time it's off.
Andrew, I'm not flying yet but I hope my inlets get a good prop blast how I have them. Left is Oil, Right is intake, and bottom is coolant.
*I wish we could move this whole email thing to a web fourm like http://www.homebuiltairplanes.com
Attaching tiny pictures is driving me crazy.
- Matt Boiteau
On 1/6/2019 5:54:32 PM, Andrew Martin andrew@martinag.com.au <flyrotary@lancaironline.net> wrote:
Matt. What Neil, Bobby & Charlie said. I am making all the mistakes, I have same oil cooler and now repositioning to face it onto airflow, I find low speed, high power & summer heat is challenging, but need to get through this to get to cruise height & power, so design for worst airflow your plane will see, admittedly, my inlet is closer to prop hub and does not see enough prop blast for real good ground testing at very high power. So all my high power tests have been flying circuits, some at very low level. disconcerting if a change that should improve cooling in theory has the opposite effect.
Andrew
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Regards
Andrew Martin
Martin Ag