Today's Message Index:
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1. 06:54 AM - Re: Primary Power Diagram RV-14 (Mudfly)
2. 10:00 AM - Re: Primary Power Diagram RV-14 (Mudfly)
3. 10:53 AM - Re: Re: Primary Power Diagram RV-14 (David Carter)
4. 12:05 PM - Re: Primary Power Diagram RV-14 (Mudfly)
Message 1
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| Subject: | Re: Primary Power Diagram RV-14 |
Thanks David.
A/P dissconect CB or switch - Just to make sure we're on the same page
regarding your comment on pullable breaker or switch for the "autopilot servos".
I assume you are referring to the Ray Allen servo, specifically
pitch trim?
I will be using the Garmin autopilot servos and I do have a switch for
those. However, I "think" those can be manually overridden by
reasonable stick forces. Not sure about other brand autopilot servos.
A runaway Ray Allen servo in elevator is a different story. I'm
still thinking about that scenario. Several factors to consider there.
How many seconds does it take the servo to go from trimmed position
to full deflection? Ray Allen says 19 seconds for full travel.
We're in trimmed flight (neutral position) so lets say 10 seconds.
You're flying along, autopilot on (of course dark stormy night). The Ray Allen
pitch servo starts to run away..pitch down. Do the autopilot servos
initially try to compensate? If so, there's 2 seconds off the clock. You realize
something isn't right and disconnect the autopilot. Next
reaction is to try and trim up using Cooley hat trim...2 more seconds off
the clock. Next you go for your disconnect CB or switch.. 2 more seconds.
The pitch trim servo is now disconnected. What position is it in after
6 seconds? Because that's where it's staying. You're probably diving
for the deck at this point. Time to focus on slowing down and figuring
out what speed you can maintain pitch control. You've got me beat by
4 seconds as far as trim tab position. My trim went to full deflection since
I don't have a manual disconnect. However, could it be possible that I
have the plane in a more stable condition because I've had hands on
stick and throttle, focused on instruments since autopilot disconnect?
Who knows. Something to figure out on a nice on a nice day during
flight testing.
Hobbs meter - I had the panel space and just old school I guess
Two B/U batteries - I want to be able to maintain flight attitude and
navigation capabilities, as normal as possible, if I need to secure
ships battery and pri/stby alternators due to electrical smoke/fire.
First sign of electrical smoke, I switch off main battery and alternators.
The B/U bats activate automatically providing power to PFD, GTN650,
and a few other nice to have items. If smoke continues, I switch off
B/U batts one at a time starting with the GTN650 and then PFD if smoke
continues. Then I'm left with AV30 SFD and Ipad.
That's the plan anyway:)
Shawn
[quote="david(at)carter.net"]Sorry for the additional reply, but I noticed a couple
more things:3. Safety of fli.
ght - put the autopilot servos on a pullable breaker that is easy to identify
& easy to reach, rather than on a fuse.
4. No need for a Hobbs meter - that is a built-in EFIS function.
---
David Carter
david@carter.net ([email]david@carter.net[/email])
On Thu, Mar 16, 2023 at 11:37AM David Carter wrote:
[quote]1. I'd replace both ANLs with fusible links. I have the same pair of alternators
set up this way. Simpler to install, marginally less weight.2. Why two
standby batteries when you have an aux alt? Standby batteries are limited in
capacity(run time) and add weight & complexity. Aux alt runtime = duration of
fuel remaining. I added a TCW Intelligent Power Stabilizer instead to deal with
any voltage sag during starter operation.
---
David Carter
david@carter.net ([email]david@carter.net[/email])
On Thu, Mar 16, 2023 at 10:33AM Mudfly wrote:
I think I'm nearing the end of my wannabe EE career and moving towards
production/installation.
I'm attaching what I think will be my "final" plan. I'm sure there are things
some would do differently. I have run the realistic scenarios I can think of through
my head and believe I have a plan for all.
It does have a couple of failure modes that will require simple checklist procedures
to rectify.
I am pretty slow at installation. If anyone notices an area that may be a
safety of flight issue, please let me know and I will make the necessary
changes.
I appreciate the help from the members of this forum.
Shawn
Read this topic online here:
[url=http://forums.matronics.com/viewtopic.php?p=510427#510427]http://forums.matronics.com/viewtopic.php?p=510427#510427[/url]
Attachments:
[url=http://forums.matronics.com//files/primary_power_system_3_16_23_242.pdf]http://forums.matronics.com//files/primary_power_system_3_16_23_242.pdf[/url]
[url=http://forums.matronics.com//files/stby_batts_interconneconnects_3_16_23_130.pdf]http://forums.matronics.com//files/stby_batts_interconneconnects_3_16_23_130.pdf[/url]
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| Subject: | Re: Primary Power Diagram RV-14 |
[quote="nuckolls.bob(at)aeroelect"]At 01:06 PM 3/16/2023, you wrote:
Bob and John.
Thanks again for being a regular contributors to my post.
I know it takes time to sit down and type the thorough replies you have
provided.
I'm still studying some things from your suggestions that I don't
fully understand. I want to at least appear to know what I'm talking
about.
Shawn
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510453#510453
Message 3
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| Subject: | Re: Primary Power Diagram RV-14 |
On Fri, Mar 17, 2023 at 9:54=AFAM Mudfly <shawntedwards@hotmail.com>
wrote:
> shawntedwards@hotmail.com>
> Thanks David.
> A/P dissconect CB or switch - Just to make sure we're on the same page
> regarding your comment on pullable breaker or switch for the "autopilot
> servos". I assume you are referring to the Ray Allen servo, specifically
> pitch trim?
>
I was referring to the Garmin GSA28 servos, but the comment would apply
equally (or more so) to the Ray Allen pitch trim servo. I have both on
pullable breakers, separated from the other (less important in an
emergency) breakers.
Panel design here:
https://davidcarter-media.s3.us-east-2.amazonaws.com/N87BP+Garmin+G3X+REV+3
9.pdf
> I will be using the Garmin autopilot servos and I do have a switch for
> those. However, I "think" those can be manually overridden by
> reasonable stick forces.
I'd recommend a pullable breaker rather than a switch. You already need
circuit protection, and you should very rarely need to turn these off, so
why put in another point of failure, cost, and weight (the switch)? I also
think that stick forces can override the Garmin servos, but in a real
emergency, who wants to be fighting the automation that's trying to kill
you? Better to be able to quickly & easily turn it off.
> Hobbs meter - I had the panel space and just old school I guess
>
Your plane, your money, your choice! :-)
> Two B/U batteries - I want to be able to maintain flight attitude and
> navigation capabilities, as normal as possible, if I need to secure
> ships battery and pri/stby alternators due to electrical smoke/fire.
> First sign of electrical smoke, I switch off main battery and alternators
.
> The B/U bats activate automatically providing power to PFD, GTN650,
> and a few other nice to have items. If smoke continues, I switch off
> B/U batts one at a time starting with the GTN650 and then PFD if smoke
> continues. Then I'm left with AV30 SFD and Ipad.
Again, your plane/money/choice. Personally, I tried to keep my architecture
as close to Z101 as possible since it distills many years of Bob's
experience & that of the other frequent contributors on this forum. I'm
nowhere near as smart as this group.
High-level electrical designs:
https://davidcarter-media.s3.us-east-2.amazonaws.com/N87BP+Primary+Electica
l+System.pdf
https://davidcarter-media.s3.us-east-2.amazonaws.com/N87BP+Engine+Bus+Detai
l.pdf
https://davidcarter-media.s3.us-east-2.amazonaws.com/N87BP+Main+Bus+Detail.
pdf
https://davidcarter-media.s3.us-east-2.amazonaws.com/N87BP+External+Lightin
g.pdf
Message 4
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| Subject: | Re: Primary Power Diagram RV-14 |
[quote="david(at)carter.net"]On Fri, Mar 17, 2023 at 9:54AM Mudfly wrote:
Nice looking panel David.
BTW. Looks like you live about 15 mins from me. Got a hangar
with room for an RV14? 8)
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