Today's Message Index:
----------------------
1. 10:29 AM - Re: Load Analysis Spread Sheet (Mike Koehn)
2. 11:01 AM - Re: Re: Load Analysis Spread Sheet (Robert L. Nuckolls, III)
3. 03:12 PM - Airframe ground connection (Louie928)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Load Analysis Spread Sheet |
What fun. Thanks to everyone who replied to this first post, especially Bob for
his insight on how I aught to be thinking about the big picture. Z-13/8 seems
like the right starting point. Great book. Found more spread sheet info in the
archives as well so I am looking forward to a first pass at the (non?) problem.
With an all electric airplane in mind and integral battery backups as part
of the equipment design (skyView and D-10) there appears to be plenty of power
redundancy for the airplane's meager mission and then some, at least on the
back of the envelope.
Fly safe,
Mike
--------
"Testing is what we do when we don't know what we are doing"
Dr. Wernher von Braun
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=347326#347326
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Load Analysis Spread Sheet |
At 12:25 PM 7/21/2011, you wrote:
>
> . . . there appears to be plenty of power redundancy for the
> airplane's meager mission and then some, at least on the back of the envelope.
Good words to hear! Keep us in the loop so we
can help you add your project to the fleet of
the most efficient and affordable airplanes
to have ever flown.
You might just do a 'back of the envelope' dump
to the List of all the electrical loads you presently
anticipate in no particular order of importance.
Just everything that spins, lights up, gets warm
or makes noises . . . and blows fuses when having
a bad day . . .
Then let's 'shuffle the deck' here on the List . . .
Bob . . .
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Airframe ground connection |
I'm building a Zenith 601XL. The airframe is constructed of mostly 0.025" 6061.
The battery will likely be mounted behind the seat and the ground connection
will be made to the nearby rear spar carry through which is 0.032" 6061 riveted
to the floor and side skins. The firewall is 26 ga., 0.018", galvanized steel.
I've seen the battery ground connection #4 AWG terminal bolted directly to
the 0.032" sheet, and the engine connected to the firewall by a short #4 or braided
copper. It seems to me that the current density at either of these connections
is going to be quite high during engine start. Is it recommended to have
a thicker metal section under the terminal at these connections? Something like
1/8" aluminum 2" or 3" in diameter riveted with, say 8 #4 rivets, to the underlying
thin aluminum or galvanized steel to distribute the current? Is a couple
of thick washers on each side of the sheet metal under the bolted through
terminals enough?
Or, run a +12V #4, and a ground #4, to the starter and engine thereby bypassing
the airframe from the large starter current. The wire length from battery to
engine is about 7 feet.
--------
Louis W. Ott
601XL beginner Quick Build
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=347343#347343
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|