GUYS, need your help!

I have the EVSD-5U-PRO Multi-Function Valve installed in my MB339...and after some tinkering I have it working properly with one exception, and I dont know how to fix this issue.

The valve, by design, will always failsafe to the gear down position when you boot up the system regardless of where you have your gear switch.
This is to prevent acidental retraction of the gear if you boot with the switch in the wrong place. Nifty right? Not so much...


Here is the issue, if your gear is up and doors are stowed (like it would be when you assemble it at the field) and you service the air, when you boot the RX the gear is coming down NOW! The problem with that is the system does not bother to open the doors first. THIS IS A SERIOUS PROBLEM as it like to rip the doors right off your plane.

Would anyone out there have any idea on how to either get the system to open the doors first or how to disable the gear down on boot failsafe all together?

Any and all ideas welcome!

Thanks!

*******UPDATE*******

A "friend" made it clear to me that I failed to give one very important detail on this set-up. I am using the Valve in MODE 2. I believe everyone was assuming I was in MODE 1, and I assumed you understood I was MODE 2.





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Anyone?

Hi

I know that this is not really a solution but this is what we do with our 5U installs.

1. After flying we dissconnect both tanks to drain all pressure as called for by the directions to help the life of the digital pressure sensors.
[Next time we fly]
2. Assemble plane at field.
3. Fill air and use manual button to put gear down. TX off doors will cycle with manual button.
4. Prep fuel air and fly.

[quote]ORIGINAL: F-18DiamondBack102

GUYS, need your help!

I have the EVSD-5U-PRO Multi-Function Valve installed in my MB339...and after some tinkering I have it working properly with one exception, and I dont know how to fix this issue.

The valve, by design, will always failsafe to the gear down position when you boot up the system regardless of where you have your gear switch.
This is to prevent acidental retraction of the gear if you boot with the switch in the wrong place. Nifty right? Not so much...


Here is the issue, if your gear is up and doors are stowed (like it would be when you assemble it at the field) and you service the air, when you boot the RX the gear is coming down NOW! The problem with that is the system does not bother to open the doors first. THIS IS A SERIOUS PROBLEM as it like to rip the doors right off your plane.

Would anyone out there have any idea on how to either get the system to open the doors first or how to disable the gear down on boot failsafe all together?

Any and all ideas welcome!

Thanks!




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weird i have the same one and dont have this problem.
you sure it works the right direction?
can you use the brakes when retracted?(not disabled by RX)
the evu-pro does this itself..
also make sure if you use spektrum you rebind after you are done.

(my gear comes down when i switch it on without the TX BUT it opens the doors first.

i think you have the valves and doors reversed on the unit.
firtst you need to set those right THEN program the unit.

Hmmmm, I see what you are saying....

Question: As the system is up without the TX does the Valve still try to drive the gear down or does it do nothing?

If what you are saying works that is a perfect solution.....

Thanks!

Anyone else have ideas?

Sandor....

You might have something there....

The diagram in the book is 180 out...I set my system with the airlines as per the drawing and I was having a hell of a time getting the brakes to work. They would work with gear up but not gear down. I reversed the physical lines and now the brakes work properly. Perhaps i need to do the same with the door lines??? Can I reverse the valve sequence on the unit itself?

So, just so i am clear, when you have your gear up and doors closed and you boot the system it will automatically put the gear down but it opens the doors first? And if that is true if you boot the system with the gear already down you will still have the doors cycle anyway?

Sorry if my questions are stupid....I have been up way to late trying to get this bird finished!

Thanks for your help!

there are no stupid questions..
if you had your brakes working only in the up position it is a problem of reversing all airlines.
then program the pro valve with the reverse function inside.
i believe the manual shows you the correct sequense to connect all airlines.
the unit was developed also to NOT retract when switching on.
but this only works if you tell your failsafe to have gear down in failsafe situation (at least this is what i do)
i build my model up on the field , pressurerise the system then switch the rx on and the gears come out.

ps : make sure your airsupply is OVER the min failsafe!! otherwise you will get a gear down ! could be a weird error when setting up your model!
also do not forget put the door valve on the same supply as the gear otherwise if you have no more brake air and your doors are on that system.
the failsafe will lower the gear it wont care about your precious doors ;-)...

as I understand this valve, there is no provision to slow the gear and door speed other than using restrictors in the airlines......is this correct?

OK, something is not right, something is bad wrong.

I disconnected my door rams so I would stop beating the crap out of my doors....

This is what I have:
(Starting with the gear down and air pressure above the minimum fail-safe level of 50 PSI)

Gear switch in down position,Gear down, doors closed, brake system working....everything is normal.
Gear switch in up position, doors open, gear up, doors close, brake system disabled, again everything normal.

Now, I shut off the radio system....system purges any air pressure....normal.

I turn on TX, then RX (gear switch in down or up position as it makes no difference) and the gear deploy instantly however the doors stay closed.....BIG PROBLEM!

I have tried it in every way possible and I can NOT get the system to open the doors before the gear is deployed. PERIOD. Makes no diff if i turn on the RX only and try to cycle the doors with the manual button, AS SOON AS POWER IS ON THE SYSTEM THE GEAR COMES DOWN. NO EXCEPTION!!!!

An interesting note that if I try the same experiment in mode 1 the doors open and the gear comes out at the same time.

***??????


This VALVE is unusable for mode 2 with this condition, what am I doing wrong?

Correct, they supply you with a festo type regulator valve and several in-line restrictors...you can use either or. I used the inline ones and they work fine.

Reverse the 2 air lines that go to the gear.
then in the setup up from the valve reverse that valve , that should do the trick.
if not it looks like a bad valve..
or i am missing something.

I did that, no joy.

Chad at Sin City has the same valve in his BARF and it does the same thing. He has to run in mode 1 and keep the nose door open all the time, he would like to used mode two and clean that door up but he has the same problem I do. I do find it interesting that in mode 1 with the gear up and the doors closed if you power up the system it blows the doors open and the gear down at the same time, but in mode 2 it holds the doors shut.

Now chad advised me to let this "leaf in the trail" go and move on to something else but I had to keep thinking about it. This is only a problem on the first deployment of the day. Once the gear is down and the doors in the right place everything is normal. I have a solution, although for 470 bucks I should not have to come up with a solution, but what if you did this....

You get to the field, you assemble your jet, air tanks are empty (because you purged them as per instructions after last flying session, right?). Now you have everything hooked up and you boot the system, nothing happens because you have no air in the system....This is where my solution comes in. The goal is to open the doors and extend the gear, right? Right! Well, I figure you could put a fill valve in line with the door down line and the gear down line. This way you could blow the doors open with you air supply (compressor) and then blow down the gear. Presto! Gear is out and doors are not tweaked. Now you can fill your air tanks and get on with your day, Just always remember to shut down the system with the gear down.

At the end of the day you put the gear up and turn off system, disconnect airlines and purge the air tanks and you are ready for the next flying session!

So, a couple of quick steps and we have the problem solved. I might just shoot a video and post it so you see what I mean...

What do you think?

And Sandor...how would I know if my valve is toast??

Double post.

Like Chad, I have it in my BARF and I'm using mode 2 (close nose door with gear down), and my valve does the same thing in Mode 2. I have not been around and had the chance to play with it yet to see if I can fix it. Since I only have the one door, I just opened the door before powering up. I agree, you shouldn't have to do something strange for it to work like you want. I'm sure Air Power can change the software to fix this easily. BTW, I have one of the very first production models, so maybe it is matter of when we got them. I know for sure, some programming was changed AFTER mine because of some irregularities in the programming that I found.

How old are the ones in question, F-18, Chad, Sandor?


Sandor,

Are you using mode 1 or 2? If mode 1, then that explains the difference, if mode 2, then we have problems.


R/
George

i am indeed in Mode 1

i just emaild airpower and this link to investigate what is going on..
have asked also about 1 gent and 2gen versions

George,

Ours are about three weeks old from Todd. Mode 1, it works fine, mode 2, like Dave said, it wants to held the doors shut and blow the gear open. Bad combination. I agree with you George, this is something that should be able to be updated through software, or maybe we're all just idiots and it is a simple programming feature. (The latter is certainly possible on this end).

Great valve, but this little quirk can be annoying, especially on a plane like the 339 where the doors really need to shut after the gear is down.

Chad

Three weeks? Well, so much for that theory.

Hopefully AP has checked this thread out and will let us know something. I know Todd is on vacation right now, but he'll see this when he gets back and he may have some insight.

George

What sucks for me is I am out of time, this bird has to go into a trailer (which is yet to be set up to haul jets) this weekend and I have NO time to waste. I am going to have to use my fix as mentioned above.

Very disappointed that this valve gets the to the 99 yard line only to drop the ball and not score....I am sure a S/W update will fix it but it is going to be a major PITA to remove from the jet to install and the turn around times just add to the bad JUJU....

Here is few pictures of it installed....

How about a manual on/off valve installed on the gear down pressure line? With the valve closed, you can assemble the plane, pressurize the system, turn on the radio, insure gear doors are open before opening the valve and dropping the gear. Then just leave the valve open for flying. I've seen a similar fix for the airplanes with this valve and retracts that need pressure to keep the gear down and locked. When you power down the system the pressure is released and the gear becomes unlocked and the airplane ends up on its belly, so a valve is installed that you shut off before powering down the system that holds the pressure.

KennyMac

Kenny, I like that even BETTER!

You are thinking for sure!

Hi

Did not realize that your in mode 2, all my birds are on Mode 1. I will try to get a message to Airpower too and see what they are working on.

BTW nice install really neat and well laid out, Good job sir!!!

Hopefully one of you guys will make some kind of contact with AP and they will have a solution....

Thanks for the kind words, you can see more of the build here: http://www.rcuniverse.com/forum/fb.asp?m=8877866

OK, I added two fill valves in-line with the gear and the door down lines....

Proceedure:

Asemble aircraft
Using air pump blow open doors
Using air pump blow down gear
Manually push doors closed
Pressurize Air system
Proceed as normal...

Not an elegant solution but it works and my doors are not getting crunched.....

That's a pain in the butt, and needs to be fixed on the unit itself.

Chad

Yeah, but RIPPING your doors off is a BIGGER pain in the butt....

One has to wonder how this ever passed operational checks?????