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Author Topic: Sharp 1000  (Read 1661 times)

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Re: Sharp 1000
« Reply #165 on: November 04, 2025, 06:49:20 pm »
Quote from: ROB25038072 on November 04, 2025, 12:51:22 pm
Quote from: Caleb on November 04, 2025, 10:29:52 am
…left over from a previous project.

Might as well use what you have for testing, the problem I have is remembering where I put thing I want to use 🤣

I think I would have orientated the magnets differently but nonetheless it looks like it works pretty well👍 and a bit of rubber will prevent that latching issue.

Did you pause your print part way though and drop the magnet in before letting your printer go again? I’ve found that if I let the magnet or whatever I’m implanting warm up on the bed for a couple minutes before dropping it i get a better looking print opposed to when I drop in a cold implant.
I just printed two parts and glued them together.
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Re: Sharp 1000
« Reply #166 on: November 05, 2025, 10:19:24 am »
« Last Edit: November 05, 2025, 10:23:52 am by CG »
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Re: Sharp 1000
« Reply #167 on: November 07, 2025, 09:36:48 am »
The fifth and last wing is in the vacuum bag.
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Re: Sharp 1000
« Reply #168 on: November 07, 2025, 04:16:35 pm »
Quote from: Caleb on November 07, 2025, 09:36:48 am
The fifth and last wing is in the vacuum bag.

Exciting times!!
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Re: Sharp 1000
« Reply #169 on: November 09, 2025, 07:50:57 pm »
The wings are finished.  They aren't perfect; the paint didn't cover as well as I had hoped.  I should have used primer.

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Re: Sharp 1000
« Reply #170 on: November 10, 2025, 01:59:09 am »
Looking good and they’ll do the job, that’s the main thing.
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Re: Sharp 1000
« Reply #171 on: November 10, 2025, 09:05:15 am »
Is it textured? It looks like its a coarse weave fabric. I'm concerned about my Coroplast ribs showing through on the surface and creating Eddy's and swirls in the flow also.
« Last Edit: November 10, 2025, 09:42:13 am by CG »
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Re: Sharp 1000
« Reply #172 on: November 10, 2025, 08:20:01 pm »
It's fairly smooth.  I'm just going to do my best and run with it.
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Re: Sharp 1000
« Reply #173 on: November 11, 2025, 12:17:12 pm »
I’m not sure but a bit of texture might help the air stick to the surface??? I’ve read, heard, seen somewhere the dimples on a golf ball a pretty important in the context of aerodynamics. Though I dare say, any texture probably needs to be in a specific position on the airfoil.
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Re: Sharp 1000
« Reply #174 on: November 11, 2025, 12:35:14 pm »
I think the golf ball rotates, kind of a "Magnus effect". Eh Maybe.🤔
Found this>

« Last Edit: November 11, 2025, 12:44:56 pm by CG »
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Re: Sharp 1000
« Reply #175 on: November 11, 2025, 03:46:54 pm »
Quote from: CG on November 11, 2025, 12:35:14 pm
I think the golf ball rotates, kind of a "Magnus effect". Eh Maybe.🤔
Found this>


Pretty much the polar opposite of what I said🤣
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Re: Sharp 1000
« Reply #176 on: November 12, 2025, 01:59:59 am »
Pretty much the polar opposite of what I said🤣[/quote]
six of one, half dozen of the other... hahahaha
 but dimples help air stick to the ball's surface longer, making the wake smaller and the ball more aerodynamic.
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Re: Sharp 1000
« Reply #177 on: November 12, 2025, 06:31:10 am »
I think the rotation is a key factor.
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Re: Sharp 1000
« Reply #178 on: November 12, 2025, 08:15:22 am »
A prototype of the new pivot block is being printed.  I didn't change the stops; they aren't horrible.  They sound bad in the video because the camera's automatic gain control tends to amplify the impact.  I'm going to try and balance the wing using a 1/2-13 x 1" long set screw instead of the washers.  The wings ended up weighing 55 grams with paint.  I moved the pivot point 3.5 mm because the wings were a little heavy compared to their area.  Setting the wing away from the pivot will give the aerodynamic forces a little more leverage.  We shall see if the calculations are worth a darn.
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Re: Sharp 1000
« Reply #179 on: November 12, 2025, 09:15:06 am »
Quote from: Caleb on November 12, 2025, 08:15:22 am
A prototype of the new pivot block is being printed.  I didn't change the stops; they aren't horrible.  They sound bad in the video because the camera's automatic gain control tends to amplify the impact.  I'm going to try and balance the wing using a 1/2-13 x 1" long set screw instead of the washers.  The wings ended up weighing 55 grams with paint.  I moved the pivot point 3.5 mm because the wings were a little heavy compared to their area.  Setting the wing away from the pivot will give the aerodynamic forces a little more leverage.  We shall see if the calculations are worth a darn.

I’m of the opinion these tiny changes (such as 3.5mm) do make a difference but whether or not we can see, measure or demonstrate that difference without being ‘clinical’ is different story.
« Last Edit: November 12, 2025, 09:31:02 am by ROB25038072 »
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