Today's Message Index:
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1. 08:37 AM - Re: Vacuum pad shear couplers (Christopher Cee Stone)
2. 03:18 PM - Re: Fw: Aero Electric Post (Neal George)
Message 1
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| Subject: | Re: Vacuum pad shear couplers |
Another response to accessory drive couplings
https://www.kitplanes.com/disintegrated-drive-coupling/?utm_source=ActiveCampaign&utm_medium=email&utm_content=KITPLANES+Weekly&utm_campaign=KP+Weekly+2021%2F10%2F12
...chris
On Tue, Oct 19, 2021 at 3:56 PM Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> So the idea that a plastic shear coupling can
> be 'overstressed' by some anomaly in field
> excitation simply has no foundation in physics.
> It is far more likely that material or a process
> used to fabricate the coupling is deficient.
>
> I found some exemplar shear couplers from a
> vacuum pump pad. The two disks at each end
> are engaged by pins on hard, drive parts.
> The cylinder of plastic between the disks
> is the shear section.
>
> Being plastic, it is not a trivial matter to
> craft a well calibrated part for shear strength.
> B&C went through some iterations of materials
> before settling on a production configuration.
>
> I'm pretty confident that Plane Power is having
> difficulty with their present batch of parts.
>
> Bob . . .
>
> Un impeachable logic: George Carlin asked, "If black boxes
> survive crashes, why don't they make the whole airplane
> out of that stuff?"
>
Message 2
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| Subject: | Re: Fwd: Aero Electric Post |
Gentlemen -
A new Tempest-branded alternator coupler was installed and tested
yesterday.
New graph and comments from Gregg follow
Neal
The graph below was from the test flight yesterday, 19 Oct. The gray
line is normalized rpm (actual rpm/150) from the left mag, blue line is
volts, amber is amps. Takeoff power was applied around 22:13:13. The
alternator field was turned on at around 13:31. The dips at 11:25,
12:55. 14:25, 16:49, etc are curious.
This graph is from =9Cblack box data=9D which is recorded at
16 Hz. The one Hz data shows similar results.
The flight to Gainesville today was uneventful on all counts. I=99m
now thinking material failure due to heat and possibly bad stock, as
Bob mentioned in his email to you yesterday (thanks for passing that
along).
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