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  #31  
Old 09-12-2018, 07:58 PM
Kyle Boatright Kyle Boatright is offline
 
Join Date: Aug 2005
Location: Atlanta, GA
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Quote:
Originally Posted by 9GT View Post
Do you know of a reference chart to find this info? I plan on using the SS AN bolts from AS&S but can not find a reference for tensile strength on the web.
The big 'ol thick Aircraft Spruce Catalog has that information for some of the hardware they sell. I can find several online resources which list the tensile (125,000 PSI) and shear strength (76,000 PSI) for regular cad plated steel AN hardware. Information on stainless depends on the alloy you're using. If you know the alloy, I bet the shear strength is online somewhere.
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Last edited by Kyle Boatright : 09-12-2018 at 08:35 PM.
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  #32  
Old 09-12-2018, 08:19 PM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
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Default Mcmaster

Mcmaster has good info if you know the alloy...SS is almost always softer but there ARE some alloys that are just as strong...
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  #33  
Old 09-12-2018, 08:37 PM
PilotjohnS PilotjohnS is offline
 
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Default My take

In general i dont use stainless bolts for anything structural. Like mentioned above in general stainless is not as strong. I also have had stainless screws jam up in tapped threads; seems it is more prone to siezing than steel hardware. JMHO
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  #34  
Old 09-12-2018, 11:43 PM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
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Default SS

There are actually some SS alloys that perform as well or better than a standard AN bolt, however, it takes some research to find them and the available sizes and options are usually more limited. The price is also generally much higher, too.
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Aerospace Engineer '88

RV-10
Structure - 90% Done
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EFII System 32 - Done
297 HP Barrett Hung
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Wiring...

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  #35  
Old 09-13-2018, 07:04 AM
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kbalch kbalch is offline
 
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Quote:
Originally Posted by AviatorJ View Post
What I was told because it communicates on the CAN bus and I have a full Garmin layout that both G3X's and my G5t and whatever else needs it will retrieve the information.
I'm doing essentially the same, all-Garmin, system and was advised by Stein's shop to go with the GMU22 for the -14. I'm not convinced that CAN bus offers any real-world advantages in our application and, since the GMU22 fits neatly into the left wing with zero fuss, I elected to go with it.

Once it's all up and running, I doubt that anyone would be able to discern from behind the stick whether there's an -11 or -22 in a given airplane.
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  #36  
Old 09-13-2018, 07:21 PM
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Tdeman Tdeman is offline
 
Join Date: May 2017
Location: Salem, OR
Posts: 57
Default Another Data Point

Benefits of the GMU 11 include:

-Price

-Weight

-It uses ships power instead of 5V from the GSU.

-Using the CAN BUS (and freeing up Serial Ports, which is less of an issue now that more and more LRU's are also using the CAN BUS).

-Mounting


Regarding the Can Bus, it is important to remember that the can bus is laid out as a backbone, with two distinct "terminations"/ends. When you have units spread throughout an airframe, the wiring doesn't have to make a bunch of jumps to and from your panel for every unit (as long as it is somewhat methodically designed.)


So, RV-10 Can Bus length might be in the 40-50ft range with wingtip and/or tail cone mounted LRU's.


Another data point regarding a tailcone install:
The GMU 11's in the factory demonstrator, and One Week Wonder RV-12iS's both sit about 32" away from dual fuel pumps and a roll servo. The interference tests conducted passed with flying colors YMMV

All that being said, those guys at Stein do good work, and could very well be taking things into account that I've overlooked.
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Last edited by Tdeman : 09-14-2018 at 09:11 AM.
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  #37  
Old 09-14-2018, 10:41 PM
AviatorJ AviatorJ is offline
 
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Location: Oklahoma City
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Default

I concurred with the thought a single angle wouldn't be secure enough. Added a second.



Had to cut the back angle piece so I can get it past a set of frames. Will know in a week or so if it's going to have any interference issues.
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  #38  
Old 09-15-2018, 10:27 PM
n982sx n982sx is offline
 
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Location: Chicago, IL
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Quote:
Originally Posted by rocketman1988 View Post
So I guess the guys that are doing tons of RV setups don't know what they are talking about...

From the Install manual:

...

? The overall length of the bus should not exceed 20 meters (66 feet).

...

I think I will stick with the guys that are doing this for a living...YMMV
I edited my post changing 25 to 20 meters per Garmin's recommendation (I went from memory instead of looking up the value, an error I readily admit) but I stand by my post. 66 feet is achievable in any RV, even a 10.

There is also one big advantage to the GMU 11 no one has brought up. It's data is available to everyone, even if the ADAHRS to which the GMU 22 is connected fails.

Stein is great and they did a great job on my harness, but they are not gods.

They were very thankful when I pointed out the wiring error in the harness for the 14 (engineered by Van's) in how the servos were wired preventing correct three servo operation. I do know what I am talking about.

Mine was one of the first to use the Van's production drawing of the RV14 harness. I would have substituted the GMU 11 for the GMU 22 in a heart beat if it had been available.
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