Question 1, I have a dx-7 and the plane that I am working on uses a split elevator and has an opening for 2 servos. Do I use y-harness or do I somehow program my dx-7?

Question 2, One of our club members asked how to hook up a on-board glo driver. Never used one so whoever can answer that I would appreciate it.

For split elevators and two servos I would use the DX7, as it lets you fine tune the positioning of the elevator halves.

Use the Aux2 channel and either mix 5 or 6. With these mixes the sub trim works on both the master and slave channels. Can't remember the rest of the detail (I'm at work!) but I have done this on the Dx7 a couple of times and it works well.

Can't help with the OBG, never used one myself either!

Terry

The sullivan OBG that I have plugs into the throttle channel. The throttle servo plugs directly to the back of that plug piggy back style. There is another plug that goes to its own battery. I use a 2000mah 6v battery pack, same as the rx battery.

There is a ground wire that attaches to the engine block as well.

You can adjust when it actually powers up the glow plug, mine is below 1/4 throttle ish [link=http://www.sullivanproducts.com/ModelProductsMainFrame.htm]Sullivan OBGD[/link]

Hey Irish. How goes it?

I used a Y for the split elevators on my Seagul Super Sport with my DX7. I was also wondering about doing it with separate channels.. looks like Redback has an answer to that one. Hopefully, he will remember to post those settings after he gets home from work.

As far as the on-board-glow, Phoenixangel got that one for you. But to further define this, it will be on at idle and at any setting after idle that you desire. I set mine to go off at about the same point that he did. So, it remains on at idle and slightly above that, then shuts down and relies on the internal glow function after that.

Dave Lockhart is in our club.. he is high up in the standings for international Pattern. I think he has been flying since he was in diapers his dad, Ron has been flying for over 40 years now. Anyway, Dave did a "white paper" on glow plugs with a complete, in depth, description as to how they work and what makes them work. It's not as simple as just hooking up a battery and going with that, but because we all just see that part of it, well, most of us just don't care... if it ain't broke.. yada yada. I will try to drum that up and Email it to you. It's pretty interesting.

Aaaanyway, OJ, banana, Delmire coffee, buttered roll, and a little RCU.

CGr.

Hey CG, what happened to the Starbuck's coffee. I can send you some of my Chock-full-of-nuts coffee. Some good old southern ham, egg basted soft and homemade muffin. All with Backberry seedless jam. Ummmm good stuff. Went to a couple of swap meets, but the crowds are down. Hope it doesn't affect The Toledo Show. I can't even get to our field with my 4 wheel drive. I'm trying to get the county to take a detour and plow out our long driveway. Probably cost me a dozen donuts.[][][]

Funny this topic came up as I just did this very thing on my J3 SuperCub yesterday.

This is for an AR7000 rx.  Not sure about other recievers.  Works great, but IF you have to reverse your normal elevator servo...then the split elevators will work opposite one another.  You have to fix this on the program mix.  I had to set both mine to -100% (thats NEGATIVE 100 percent)

Hope this helps.  Worked great for me and Id rather use the rx over a Y w/servo reverser.

http://www.spektrumrc.com/Articles/A...ArticleID=1798

ATVAlliance , Thanks I have printed that out and will give it a try. I am always amazed at the knowledge of those on RCU.

Ah.. that's good stuff, ATVAlliance.

As I said, I didn't really want to use the Y cable on my Super Star, but I couldn't find out how to do the dual elevator servos in separate channels. That really helps to dial them in to be symetrical in operation.

One point that some seem to overlook, though. For this, I believe you need two identical servos. That means that if you are using the Spektrum DS821 servos, you need to use two, not mix the Spektrum with a Futaba or Airtronics. Or, of course, if Airtronics, use both of the same servos. This is probably elementary, but some will try mixing servos and question why they get mixed results.

As Goirish, I've marked that page to copy the info.

Irish.. I bought the Delmire coffee when I was in Germany in December . For the snow, well, doughnuts just don't work. I need a crisp green good old American 20 greenback. This is, of course, New Jersey..

CGr.

CGR...not sure the outcome if you use 2 different servos for each elevator.  I used 2 identical ones (actually were DS821's) and like I said...works perfectly.

I did not mix it with rudder though.  But Im sure it will work just fine.  Just be sure to check the throws in your mix if you want to mix the rudder with elevator.

Good morning Gene and Dick, the sun is up, the birds are singing and my cat's are driving me nuts!!
The DX 7 makes me as crazy as these cats!! There is a step in there program that I always forget and it kicks my butt. Every time I have it locked into my memory I seem to forget it by the time I program another DX 7. This time I'm printing out that page ATV posted and hanging it on my shop wall.
I have used a couple of the Expert on board glow drivers, that's the only one I have used. My big problem with them is they don't work well if they are mounted too far away from the engine/glow plug. I gave up on them. More trouble then they are worth for me. I spend the time tuning the engine but when someone asks me to install one for them I went back to my home made unit, just a micro switch connected to a battery and the glow plug. The micro switch is next to the throttle servo and I make up a cam on the throttle arm that turns the switch on and off at a set point. Really old school but it is fool proof. And cheap!! You know how much I like cheap!!
One scoop of double moca beans to four scoops of Colombian Supremo beans, grind and brew. A smooth blend that will put a BUZZZZZ in your morning!!
Gene

Geeez.. Gene. That brew sounds interesting

This is one of those "Now why didn't I think of that" moments for your "homebrew glow driver".

What step do you keep forgetting? Perhaps you can give us some insight so we don't forget the same step.. we can forget a different one.. []

CGr.

Wanna think Dickwe should go to Gene's for coffee.

I'll be on the next flight.. oh wait.. we need to get Bev Ken, Mike, and Bruce (and all the others that were going down-under) involved.. take one of those FEDEX 777's!!!

Gene.. get the brewpot going! Expect company!!!

Dick.

I even know a few places you may like to go in the evening!! I brew and grind my own so it took me a while to come up with that blend. Now all other coffee tastes bland. There is a step in setting up the DX radio where you have to put a channel in inactive mode? Without boning up on the programing I can't recall what it is. It's something for the two aileron servos. I only program that radio once a year or two. These days out at the field when someone is having a program problem and I see JR or DX I just walk back to my chair. All I would do is mess it up more. I do tell them who at the field to ask for help though.
My Futaba 9-C is something I just got used to. I think Futaba used Gorillas to test the programing just to make sure I would be able to do it myself.
Ch 8 is the default for using two elevators and 1-6 or 7 is used for the two aileron servos. You do have to activate them though but even I can figure that out. Heck, I can even mix ch 5 for elevators. The Gorillas weren't very bright so they were sure I could do it all by myself.
I'm not too bad with the JR 9303 but I don't let the instruction book get too far away from me when I'm setting up a plane. It too has some silly step I tend to forget about.

Id say hes talking about the input select area of the system setup.  Needs to be set to INH.  Would be easy to forget about since when I program my radio...I hardly ever go back to system setup once I do general setup.  Just a guess though.

It is something that has to go INH or one side doesn't work. I just don't use the radio enough to remember it. Nothing hard to do but I forget it every time!!

Then my guess was right. I found out this because before I found the link I provided...I could only get 1/2 of it to work myself...or something about it just didnt work quite right. Also, I think i was using Mix1 rather than 5. Didnt think it mattered...but it obviously does since its specified as that in the how-to.

Go into the main setup screen and inhibit (INH) your AUX 2 channel switch so that switching it in flight won't affect the mix.  Then go into your flight setup screen and mix the two channels, using either five or six.  Choose ELEVATOR -&gt; AUX 2, then most likely you will use -100% because your servos are probably identical, with the control rods coming off the same sides of the control horn.  But if you choose -100% and they work opposite each other, then just change it to +100% and it will work perfect.  Using mix 5 or 6 will allow the master channel (elevator) to pass through all of it's setup parameters to the slave channel (AUX 2) so that dual rates, expo, and the main elevator trim tab on the face of the radio operate both halves exactly the same.  However, the SUB TRIM functions in the setup are a bit different.  If you SUB TRIM the elevator, it will affect each half the same, but if you SUB TRIM AUX 2 channel, it will only move the left elevator half (you should setup the right elevator half on the elevator channel and the left half on the AUX 2 channel as normal convention).  So you can fine tune the two to get them lined up exactly even with each other by using the SUB TRIM function.<div>It is absolutely the best way to setup dual elevators.  In fact, I use a similar setup on dual ailerons as well so that you can program in differential.</div>