Scratch Build Composite Airplane Cowling Part 3 EP 53
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- Опубликовано: 20 авг 2024
- The scratch cowl build continues with custom cowl vents for the Turbo Yamaha Rans
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It's too late now but a good mold release is hair spray on plastic wrap. Also, acetone will dissolve that pink stuff.
Nice job mate. My two cents worth... I think the louvres need to be flush with the bottom tray of the NACA vent and inside the cowl... The low pressure area is at the surface of the 'tray' so the louvres as you have them are forcing the low pressure air out into the main "normal' air pressure... Maybe?
Very interesting thought there.. I’ll keep that one in mind for sure. Thanks!
Small suggestion, I would slightly round the inside corners of the vent holes. It will minimize Crack propagation. Looks great. Thanks for sharing.
That’s a good tip! Thanks!
I don't know if it will work, but it looks cool as hell.
Thanks!
This is a very interesting vent design.
At first I thought the ubiquitous NACA ‘inlet’ shape was going to draw air Into rather than Out of your cowl. When I realized you had designed the louvres at the aft 1/3rd, it occurred to me, you are probably onto something here. It sure looks attractive and I’m betting it does exactly what you want it to.
Thanks! I think it’s gonna work out👍
Can't wait to see the performance numbers on this thing.
Right there with ya! Should be a fun ride👍
Looks like it turned out great!
Thanks guys!
Again, beautiful work!
Thanks!
Josh the carbon king :)...Mike Patey would be patting you on the back...great job Josh
Haha, not sure about that but I do appreciate the complement! Thanks Mark👍
At the least, it will let the hot air out on the ground with the engine off.
I can't really hazard a guess what it will do in the air. The first instinct would be to say that the NACA inlet is going to cause a high pressure area that won't breathe well. However, who knows what will happen when the high pressure low velocity air rolls over the ski ramp of the first louvre and gets hauled away by the high speed slip stream. I think someone else called it right, hook up a manometer and see what the pressure differential is inside to outside. Or maybe even play with a strategically placed smoke bomb or two during engine runup.
I do plan the monitor pressures both inside the pressure plenum in front of the coolers and back here in the post cooler part. I,ll even be blocking these just to see what difference, if any, they influence. My gut says it’ll be most effective with higher air speeds and not do much on the ground or slow. Time will tell, thanks for watching👍
Awesome, very nicely done!
Thanks!
Great job Josh, again, you are an inspiration as you follow through with your projects. Can't wait to see the next one! 👍
That turned out nice!
Thanks!
Amazing as always. That carbon is so sweet.
Thanks
I have an S20/Rotax 914. I considered putting vents in a similar location to vent hot air when parked and to take cooling air in during cruise…assuming that in flight there would be a high pressure area around the base of the windshield. My ship was already flying at this point. Prior to cutting the cowl for the mod I had in mind I used a differential manometer to measure the pressure on the inside vs outside of the cowl at the point I planned for the vent. I discovered that the pressure on the top of the cowl was lower than that on the inside…a vent there would have (in cruise) allowed air that came in the front of the cowl to simply escape out the aft top of the cowl without taking any heat with it. Based on this I abandoned that idea. My only cowl outlet remains at the bottom rear of the cowl so air that comes in the front above the (air cooled) cylinders has no choice but to take some heat with it as it passes over hot cylinders and exhaust pipes on the way out. The Rotax is air, oil and liquid cooled. The above comments relate only to the air cooling aspect. I have other thoughts you may be interested in on the ducting for for max efficiency of your oil and coolant radiators. Contact me if interested. Great build vids and fab skills!
Thanks Martin! I’m right there with you. I feel like I’m in front of the high pressure stalled air bubble that will be in front of the windscreen but time will tell. Like you eluded too, I don’t really need air cooling for my engine as it’s all liquid cooled so my main focus it to cause as much vacuum or “lower pressure in this back section of the cowl to influence as much air as possible to pass through those heat exchangers. The only way in the cowl is through them so I think I’m on the right track. Reach out to me at project2aircraft @ gmail if you want to share some more ideas and thanks for watching!
Legend
Thanks for watching
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Beauty!!
Thanks!
Wear a mask please, awesome work and really cool progress I can't wait till the next video
Thanks!
Far enough away from the high pressure in flight at the base of the windshield? Doubting it, sorry. Carbon dust is terribly unhealthy (understatement).
Sorry for? Your assessment is just as valid as mine and you could be right. Can’t agree more about the carbon dust, nasty stuff… Thanks for watching👍
@@Project2Aero just didnt want to be a debbiedowner :) Your cowl work is fantastic tho! Im watching carefully and learning for when i do mine. Thx for posting!
@@PeteZoot I appreciate that man! Not gonna hurt my feelings any, so fire away all you’d like. I enjoy the engament👍
Looks good, but at least wear a dust mask.
Thanks Craig! For what it’s worth I do wear a mask when I’m generating lots of dust. The clips you see most of the time are generally shot after the bulk of the work is done and I am bad at keeping PPE on for those shots. I need to get better at cropping myself out of the frame as to not portray the wrong example to folks👍 Thanks for watching