Oasis 737 Project

[737NGer]

To interface my electrical system panels I need to simulate the various power buses.

Best way in my opinion is to use a DAC, but the problem is I can't find many high voltage DACs.

I'm looking for a 0-40V DAC, high res, SPI or I2C interface and that can handle high currents (up to 100 mA.) Where can I get one?

[737NGer]

Hi Does anyone know what kind of chromate coating is used on the case of the panel?

Apparently some types of chromate coatings are highly toxic, and there's a kid in the house so I want to check.

[mickc]

Usually Zinc Chromate

[737NGer]

Usually Zinc Chromate

Isn't zinc chromate more of a yellow colour not a goldish/brown colour? Probably something else

[Garys]

That looks like an alodine or some other type of chemical treatment. I wouldn't be to concerned. Just like lead paint, don't let your kid eat it 

[737NGer]

That looks like an alodine or some other type of chemical treatment. I wouldn't be to concerned. Just like lead paint, don't let your kid eat it 

Thank you Mick and Gary for the advice. Yeah...lead paint...good analogy. 

I wonder what it tastes like though     

[737NGer]

Finally got it working!

[mickc]

Nice, any luck with the AC side yet?

[737NGer]

AC is a different story...need a 400Hz pure sinewave static inverter. Probably some $2K+  not within my present budget, but I might have to get one not only for the GEN metering but maybe for other stuff in the cockpit that run on this high power.

A couple of issues I ran into:

From the CMM, it says that AC ground is also the same pin as DC Ground Ref (not to be confused with the normal DC Gnd), so I'll have to connect this pin to both the return of the DC supply and at the same time to the AC Inverter?

I accidentaly applied 28VDC to a terminal connected to the ammeter which only takes about 80mV   . The ammeter however has + and - pins and only one pin was connected, so I hopefully didn't do any damage. If, however, the ammeter is internally connected to the DC GND then I've probably fried it. Do you think that the ammeter is in anyway connected to DC GND?

[mickc]

First of all - "Building a sim with OEM NG components" and "having a budget"   - You can pick only one option 

2.  Yes, AC & DC grounds are often connected especially in inverter environments.

3. Should be fine if you only connected one side.  These are only shunts so you are pretty safe there as they will not be internally grounded.

[kurt-olsson]

First time i ever see this NG panel in place of a cockpitbuilder! Nice work!

[737NGer]

First of all - "Building a sim with OEM NG components" and "having a budget"   - You can pick only one option 

2.  Yes, AC & DC grounds are often connected especially in inverter environments.

3. Should be fine if you only connected one side.  These are only shunts so you are pretty safe there as they will not be internally grounded.

Thanks for the info Mick - it'll help me a lot.

I will be away for a few days and when I'm back, I'll try to get the functional test working. I'll try to upload a video of it then.

First time i ever see this NG panel in place of a cockpitbuilder! Nice work!

Thanks Peter! Where are the IPECOS? 

[bernard S]

oh boy are you in for a treat  .. going real with ALL the ac and dc power buses    ... if you think 2k is expensive  your about to enter a black hole of which there is no return..I think Mick was being polite with smiley faces... your budget for yoyr build is it cost what it  costs 

you will need these as a heads up ?..i still have to redo pandoras box the wiring there needs be completed and blah blah but yiu get the idea

[737NGer]

oh boy are you in for a treat  .. going real with ALL the ac and dc power buses    ... if you think 2k is expensive  your about to enter a black hole of which there is no return..I think Mick was being polite with smiley faces... your budget for yoyr build is it cost what it  costs 

you will need these as a heads up ?..i still have to redo pandoras box the wiring there needs be completed and blah blah but yiu get the idea

Yes at some point I'll have to simulate all the DC Buses and AC Buses, not just for the meter, but to power all the panels, logic etc...

The main holdup is partly money and space ...I still need a shell to set all of this up (beyond budget,)  and the 400Hz static inverter which is again too expensive for the time being.

[kurt-olsson]

Thanks Peter! Where are the IPECOS? 

On the way as we speak! Pictures coming soon.

[bernard S]

heres my two cents and i will never mention it again.. i promise ..bud  you keep saying a deck beyond budget   and a 400hz converter too expensive and beyond your reach budget wise and no space to build . these are the most basic requirements since you want to go all real per the design basis aircraft  from what i read   you wallet does not match your palette

if you think you sre going to recoup by doing training etc ..you will not period end of story as your software is not up to.par

doing  all  real requires a team of people  loads of special tools etc etc   and time lots and lots of time by time i mean years andvyears ..the list of extras requiredis endless... but like i said this just my 2 cents worth... you actually might be better off getting simulated items they are way more palletable finanically

if you are dead set on this going all real   ..i tell you this you can buy a decent house , luxury car buy luxury i mean 150k plus or  nice aircraft for what you are about to spend plus it appears you going to need alot of help (usually found in bottle of decent scotch) ... good luck to you  may i suggest that before you go too far down this path reach out to someone that had all real and i dont mean a mix of simulated and real  and make a trip and decide from there 

[Joe Lavery]

Very good advice Bernard,
Many builders start out with high aspirations, but very quickly realise the enormity of the task they're about to undertake.

There are plenty of people on this site who have already gone this route and can offer helpful insight.

[737NGer]

heres my two cents and i will never mention it again.. i promise ..bud  you keep saying a deck beyond budget   and a 400hz converter too expensive and beyond your reach budget wise and no space to build . these are the most basic requirements since you want to go all real per the design basis aircraft  from what i read   you wallet does not match your palette

I will definitely buy an inverter at some pint in the future; the only use I could make out of it is the gen metering - not worth investing in (for the meantime.)

if you think you sre going to recoup by doing training etc ..you will not period end of story as your software is not up to.par

I'm not too sure what you mean by that, but if you mean Prosim and OEM don't mix too well you're 100% correct. Luckily, you could always take the available prosim values and rewrite the logic on an Arduino of some sort.

if you are dead set on this going all real   ..i tell you this you can buy a decent house , luxury car buy luxury i mean 150k plus or  nice aircraft for what you are about to spend plus it appears you going to need alot of help (usually found in bottle of decent scotch) ... good luck to you  may i suggest that before you go too far down this path reach out to someone that had all real and i dont mean a mix of simulated and real  and make a trip and decide from there 

I don't have the luxury to invest $1 mil + on a sim or even a fraction of that - and even if I could afford such a sim, I would still try to save money as much as possible.

$1 mil + means you buy an entire cockpit, with all the panels, at proper value near SV market value (20K per panel average), fully wired and converted by a specialist simulation company as well as a high fidelity flight dynamics engine supplied by the aircraft manufacturer + Collimated dsiplay + 6 DOF motion platform. Far beyond what I'm hoping for.

This is a long term project, probably will take around at least another 4 years from now - I'm not in a rush to get it flying - I don't mind the wait.

I appreciate the advice Bernard - thank you.

BTW is you're build a 747? Photos please

[mickc]

Weeelllll.....

That $1mil would almost get you the "high fidelity flight dynamics engine supplied by the aircraft manufacturer" so now you are on to $2mil 

[Nat Crea]

Bernard's "Pandoras Box" sticky note is the best response/advice ever...by far 

Nat

[bernard S]

here ya go

[XOrionFE]

Holy Shite Bernard!

You win!!

[kurt-olsson]

Haha Quite the Setup you got there Bernard!
Love people who goes -"all in".

[737NGer]

Does it have a motion platform?

Either way ... challenge accepted!   

[bernard S]

yrs 6 doff hydraulic to be fiited ... but tbis not my thread.. i was just commenting on issues going all real in closing theres another chap (wont name names) on here thats more advanced than i am