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  #61  
Old 08-02-2013, 02:27 PM
bird's Avatar
bird bird is offline
 
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Default Weather proofing

If you are familiar with electrical standards, I think a nema 3R enclosure would be more than adequate . Basically rain proof, that's it

Bird
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rv8 entire airframe at airport now, painting done, intersection and gear upper and lower fairings done, maybe order engine around first of year or before the next rate increase.
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  #62  
Old 08-02-2013, 08:24 PM
bob888 bob888 is offline
 
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Location: Fresno, CA
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Default

I'm for it as well. I would like to have it incorporate or at least interface with an external power plug like to Cirrus box has.
  #63  
Old 08-03-2013, 09:23 AM
BillL BillL is offline
 
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Location: Central IL
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Default

Quote:
Originally Posted by MCA View Post
The system is all our own design - we are not using third-party relays.

We now have a draft INSTALLATION MANUAL with wiring diagrams on our web site here. (scroll down to the PPS section)
Surely not? Not to be an a$$, but do grow your own chips, make the relay housings, weld to the chips etc? That seems to be a high capital/volume business? Teach me something new.

Oh - Most solid state have a voltage shoot through issue, and thus a rated, validated voltage for robustness, and seem to derate at some ambient temperature.

How is the errant voltage handled, and what is the full amp rated temperature environment capability? I LOVE solid state devices that are properly designed for robustness, simple and the ultimate in reliability and life.

One more thing - I am sitting with the parts to assemble, and see that electrical systems are like DNA, no two are alike. Some commonality here for schematics, locations, mounting holes, wire routing that allow for building rather than design with a drill and crimper instead of a mouse and solid modeling would certainly be welcomed, at least by me. Cost is an object, as I have a relatively simple panel and it still cost more than my first house and first 4 cars combined.

Thanks for including your potential customers in your process, that is your best idea. Having worked in a research department for 10 years, the most difficult thing was to interpret what customers "wanted" from what they would "buy" and what they really "needed". The best process (of thousands that did not work) we used was the analytical hierarchy process, AHP in a comparative matrix. Happy development!
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Last edited by BillL : 08-03-2013 at 09:25 AM. Reason: spellin'
  #64  
Old 08-03-2013, 11:16 AM
David Paule David Paule is offline
 
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Location: Boulder, CO
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Default

Quote:
Originally Posted by bob888 View Post
I'm for it as well. I would like to have it incorporate or at least interface with an external power plug like to Cirrus box has.
In my case, since I've never used one in the years I've owned my Cessna 180, I wouldn't want one. It wouldn't be necessary. But if it were a built-in part of the unit, its extra size and weight would preclude this product.

Dave
RV-3B, now building wings
  #65  
Old 08-03-2013, 01:15 PM
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Andy Hill Andy Hill is offline
 
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Hi Marc

An interesting concept, and trust the feedback on here has been useful?

Couple of queries / requests / suggestions:
  1. What is the Starter Current relay good for? Or specified at purchase?
  2. Can the Unit output the equivalent of an Alternator Warning light, or at least Low Volt (like the Starter light offered)?
  3. What current rating will the Alternator terminal have? Or user specified at purchase?
  4. I understand the new breed of Li batteries are safe, but if Master left on and Battery drains below X V they are ruined. The suppliers sell at added cost/weight a relay to isolate the battery before that occurs. Could be worth incorporating here?
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  #66  
Old 08-04-2013, 12:37 PM
BDFLYER BDFLYER is offline
 
Join Date: Aug 2013
Location: Maryland
Posts: 18
Default Adding ground power input

Hi Marc,

After discussing this with a couple of your team members in the booth at Oshkosh this week, I see immense value in this product. However, I have one ask: please add the ability to connect to ground power (a GPU - one can assume the power is already DC at the same voltage as the system).

This would help enable the operation of the plane's systems on the ground without actually running the engine or depleting the battery(ies).

This alone would make the proposed device even more useful.

Thanks!
  #67  
Old 08-04-2013, 05:20 PM
the_other_dougreeves the_other_dougreeves is offline
 
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Default

Quote:
Originally Posted by bird View Post
If you are familiar with electrical standards, I think a nema 3R enclosure would be more than adequate . Basically rain proof, that's it

Bird
How about NEMA 4X instead? Per Wikipedia, NEMA 4 is "Watertight (weatherproof). Must exclude at least 65 GPM of water from 1-in. nozzle delivered from a distance not less than 10 ft for 5 min. Used outdoors on ship docks, in dairies, and in breweries. The 4X model has corrosion resistance."

TODR
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  #68  
Old 08-04-2013, 06:28 PM
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Mike S Mike S is offline
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Default Welcome to VAF!

Christopher, welcome to the good ship VAF
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Phase 1 done, 2/4/2011

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  #69  
Old 08-06-2013, 05:23 PM
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MCA MCA is offline
 
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A new product is usually a combination of existing circuits and new circuits. As the new circuit designs mature, we eventually get to the point where we need to make simple prototypes to test them out.

On the VP-X we have a microprocessor to control and report the circuit’s behavior – for example detecting a short circuit or over-current condition, then shutting it down, then reporting it to the EFIS.

But on the PPS none of this is needed so we decided to develop the solution without a microprocessor. In this case it can detect short circuits but not the fine level of detail the VP-X can detect. And frankly it does not need to. It just needs to protect against short circuit conditions or gross excursions from the rated load limits.

Another benefit is that we can use high temp range components. Normally we use components rated to 85 deg C (185 deg F), which is plenty for the cockpit environment. But for the engine compartment our goal is higher and that is difficult to do with integrated circuits. So we’ve done some extra design work and used discreet components instead to meet the higher temperature goals.

Below is mock up of the circuit that latches the electronic circuit breakers off when there is a fault. It also includes a reset mechanism so you can reset a “blown fuse” from the cockpit.



Next step after the mockups work is to do a schematic review with the team.
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Last edited by MCA : 10-16-2013 at 08:48 PM.
  #70  
Old 08-07-2013, 11:27 AM
Sig600 Sig600 is offline
 
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If I didn't already have the old stuff on the firewall, I'd be all over this.
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