I have wondered about this. How much are we talking about? Is it enough where one could say his real profession is that of an Entertainer?

I have wondered about this. How much are we talking about? Is it enough where one could say his real profession is that of an Entertainer?

I have wondered about this. How much are we talking about? Is it enough where one could say his real profession is that of an Entertainer?

Yeah...YT is not helping him much, if anything it's hurting his progress for no real gain at this point. His real lift would be to garner feedback/input from people who have expertise in other areas, but he tends to ignore that at this point.

Based on his numbers, he's getting a couple thousand a year at best. At that low volume, you need dedicated sponsors or things like Patreon to keep it at all financially viable (or do it more for fun).

https://socialblade.com/youtube/channel ... t8-YEAOxbg

I've heard it's around $2-6 per 1000 views, but ad-blocked views don't count for monetization. And length of video plays a role in the calculation too.

I'm fascinated by the Patreon model. I watch way too much stuff to throw a couple of bucks a month to each content creator.

What happened to the original oil collar that Peter is making a new one?

Trying to make it out of plastic... that is astounding, but not too different from choosing to not install the retention clip on a press-fit oil seal.

I think he said that he thinks some debris ran through it when the engine quit. Scored the shaft and damaged the oil collar. It seems more likely that it simply ran dry (no oil).

Everyone seems to be in agreement that Delrin was a bad idea for the Oil Collar. However, when he first popped up with the idea, I thought it might work. Delrin is fairly remarkable stuff, they make ball-bearing balls out of it.

I've got a few Harkin blocks on the sailboat with Delrin balls. They don't need lubrication, very low friction, and they've lasted a long long time.

https://www.harken.com/en/shop/ball-bearings/

I think the killer was the coefficient of expansion, he probably should have looked into that more closely. But, the idea of using Delrin didn't seem crazy to me.

Jack

FIFY

Lucky that he discovered this while at AGL 0.

[youtube]https://youtu.be/IiGEoQpcjos[/youtube]

It's still in living memory that materials like nylon and phenolic used to be used for timing gears (bathed in motor oil) in car engines. That's not to say that those are ideal materials for that job—their chief attributes for that application were that they were quiet and that machining them to the desired shape was easier than metal—just that Delrin isn't a preposterous choice per se.

BUT

Whenever you go off the beaten path with engineering materials then you either really need to do your homework, as several posters have said in this discussion, or you need to accept that you're going to have to proof test the part. Specifically, by homework I mean a thorough engineering analysis and proof test I mean a long ground run (better yet both).


The information out there on Delrin suggests up to 20ksi strength and a 120°C operating temperature. At a glance that latter number seems marginal for this application- an airplane engine redrive that is getting hotter than expected during testing. The former number seems okay (oil film strength is much, much lower) but I'm not a bearing guy or a tribology expert. I'd have a few good, critical questions but I also don't know what I don't know.

(And those fiber timing gears I mentioned, those gained varying reputations over the years for long life- or otherwise.)

"Y'all be careful"

Yeah, those timing gears lasted just about 60,000 miles, then you broke down dead on the side of the road. Whereupon you or your mechanic replaced them with metal that lasted forever but made that soft whirring sound.

This is why we have timing belts.

IIRC the whole reason that Peter is even playing with the delrin bushing is because he doesn't want to rebuild the redrive and this is a band-aid to get him back in the air and move the plane to California eventually. It's not intended to be a production fix, and I'm guessing that this falls into his "fix it properly in production" bucket along with most of the rest of the design.

If the goal is to get to California and start production, it would be easier to board a Southwest flight with his plans and dataplate and start over. Just a little call to the FSDO to change the test flight area.