RE: 50cc Edge V2 has landed  
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RE: 50cc Edge V2 has landed - 6/16/2007 4:43:26 AM   
Captain Randy



Posts: 117
Joined: 9/18/2005
From: Locust Grove, GA, USA
Status: offline 		It sounds like the two servos are not matched perfectly and they are fighting each other. Have you tried disconnecting one to see if the buzzing stops? Then you would just have to adjust the other to match or just use one servo.


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RE: 50cc Edge V2 has landed - 6/16/2007 4:47:49 AM   
TheFoxes


 

Posts: 109
Joined: 8/29/2003
From: Brooklyn Park, MN, USA
Status: offline 		I'm sure that they are fighting each other. The problem is that in the first 25-30 degrees of travel, they're perfect. It just when they get way out there that there's trouble.

ff

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       Post #: 177

RE: 50cc Edge V2 has landed - 6/16/2007 10:55:37 AM   
Tired Old Man


 

Posts: 11513
Joined: 2/25/2002
From: Central, CA, USA
Status: offline 		The best solution to your dilemma is to eliminate one of the rudder servos and change out the remaining rudder servo to a 5955. There is no need for dual rudder servos in this plane at all, just one good one. The 5955 meets that requirement easily and also simplifies the installation while making it safer as well.

Should you elect to retain the dual servo installation, don't have a programmer, and are unable to match servo travels and linkage distances through all points of paired servo travel, your last option would be to obtain a Matchbox or similar and dial in the servo neutral and end points for accurate pairing. Personally, I would go with the single servo and dump some weight while doing it.

Improper linkage adjustments on paired or greater servo installations is a real good way to lose a plane in very short order. Worse is when one or more servos go up in flames because of extremely high amperage draws. It DOES happen! When setting up ganged servos one should use a servo volt and amp gauge in order to know absolutely what is happening at the servos. Gauging the amount of "buzz", as some do, is an absolutely horrible way of doing things.

< Message edited by Silversurfer -- 6/16/2007 5:40:33 PM >

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If you can''''t fix it with a hammer, you have an electrical problem.

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       Post #: 178

RE: 50cc Edge V2 has landed - 6/16/2007 2:28:50 PM   
R.J. Rose Ocala FL


 

Posts: 79
Joined: 6/4/2002
From: Ocala, FL, USA
Status: offline 		Tom is correct. The geometry of the servo arms, rudder horns and control rod length all have to precisely match. Two rear mounted rudder servos is probably the most difficult setup and the servo programmer can't accomodate geometry errors (mismatched angles and distances between the two sides). Even analog servos will protest if they are stalled at some point in their travel. Two servos on an aileron is easier because slight mismatches usually result in a very slight warp of the aileron rather than stalling the companion servo. Two or more servos in tandem on a rudder pull/pull are easier because there are fewer variables in the geometry.
Remember that stalled servos are drawing high current. Apparently this is only happening with the higher end of the throw, so it may not be a big factor. If they were buzzing at the neutral position they would be drawing high current for longer periods of time.

The question may be how much buzzing? There seems to be some normality with buzzing digis, especially the JR's. If the buzzing is louder than say the ailerons at neutral (slight weight load on the servo during ground/static operation) the problem needs to be fixed.

Best solution, IMO, is a single powerful rear mounted rudder servo or pull/pull. Note that a single rear rudder servo needs good stout hardware since it is push/pull and any flexing in the push side of the cycle is a really bad thing.

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RE: 50cc Edge V2 has landed - 6/16/2007 2:42:46 PM   
Al Lewis


 

Posts: 1791
Joined: 7/5/2005
From: Port Orchard WA, USA
Status: offline 		I went with the single 5955 on a pull-pull system and have no problems with it whatsoever. Unless you desperately need the added weight in the rear I would cover the servo openings and switch over to the same or gang the two 5945s on a pull-pull. Otherwise, you're are going to have to program those two as described. It would be a real same to have one of those two lock up on you at full rudder. Pretty sure you wouldn't get that one down safely.

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< Message edited by Lou55 -- 6/16/2007 4:19:30 PM >

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Take Offs are Optional, Landings are Really Nerve Racking!! Al Lewis AMA #821623

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       Post #: 180

RE: 50cc Edge V2 has landed - 6/16/2007 4:23:52 PM   
TheFoxes


 

Posts: 109
Joined: 8/29/2003
From: Brooklyn Park, MN, USA
Status: offline 		I think the linkage is about as close as I can get it. Like I said, the problem doesn't start until about 30 degrees throw. Any adjustment and I start to have trouble at neutral. The single servo solution sounds very good. Problem is I've been working like mad to cut nose weight and get to a good 3D balance. I guess one servo and a couple ounces of tail lead won't change my net flying weight.

Thanks guys!

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       Post #: 181

RE: 50cc Edge V2 has landed - 6/16/2007 5:43:15 PM   
Tired Old Man


 

Posts: 11513
Joined: 2/25/2002
From: Central, CA, USA
Status: offline 		Pop out the tail tube and put a little lead shot in it. Another option is to add an even less amount of sheet lead to the bottom of the rudder. It's farther aft and therefore requires less weight to do the same job as a servo.

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RE: 50cc Edge V2 has landed - 6/16/2007 6:54:04 PM   
R.J. Rose Ocala FL


 

Posts: 79
Joined: 6/4/2002
From: Ocala, FL, USA
Status: offline 		What engine are you using? Mine has a DA50 with pull/pull rudder (single servo) and I had to mount the ignition battery on the engine box and the radio batteries (all 1650 mah NiMh) on top of the tank to keep the aircraft from being tail heavy. Unless you are using a 4+ lb engine, you should be able to balance by moving the radio batteriy(s) aft into the fuselage (making a small tray if you have to). I am using a single 8611 rudder servo for rudder and Hitec 5845's on the elevators.

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RE: 50cc Edge V2 has landed - 6/17/2007 2:49:57 AM   
TheFoxes


 

Posts: 109
Joined: 8/29/2003
From: Brooklyn Park, MN, USA
Status: offline 		I'm running a big-old magneto G-62, with spring starter. I'll upgrade to a performance 50cc when I get some skills built up.


ff

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       Post #: 184

RE: 50cc Edge V2 has landed - 6/17/2007 8:46:11 AM   
flatlandmike



Posts: 1146
Joined: 10/6/2003
From: lexington, KY, USA
Status: offline 		That engine will work fine in the performance category. And to drop a lot of nose weight you can change it from a magneto to an electric ignition. The mod will net you a pound of the nose and then the engine will only be about 8 oz heavier than my da50.

Another thing is you can run just one good servo in the tail like a 5955 or JR 8611 or 8711. My friend has been running a 5955 on his 33%er mounted in the tail for some time and has had no issues.

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RE: 50cc Edge V2 has landed - 6/17/2007 10:26:04 AM   
grumman-cats



Posts: 124
Joined: 11/2/2005
From: leslie, MI, USA
Status: offline 		I've got a G-62 as well that I'm considering installing on one of these aircraft. I'm curious to know if you do go with the electronic ignition, do you get the same type of performance from the engine that you would get from a DA type that is designed from the start to be installed in an aircraft. Also do they have a quiet exhaust system out there for this engine.


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flying: grumman F8F bearcat, X-TREME aerobat, goldberg SU26, Top flite Seafury

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RE: 50cc Edge V2 has landed - 6/17/2007 3:59:06 PM   
rctom



Posts: 5195
Joined: 5/8/2002
From: Flower Mound (near Dallas), TX, USA
Status: offline 		THe G62 with electronic ignition is an excellent engine. It's smooth, responsive, reliable and easy to start. The only downside is the weight, which is not really extreme. Power is excellent and will tend to offset the weight in vertical.

The G62's exhaust port is shaped in a way that keeps noise down. You can use almost any simple exhaust diverter and it will not be real loud.

TF

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RE: 50cc Edge V2 has landed - 6/17/2007 4:09:43 PM   
Al Lewis


 

Posts: 1791
Joined: 7/5/2005
From: Port Orchard WA, USA
Status: offline 		If either of you guys are looking for a great 50 for this plane buy one of Tom's 3MM 53cc engines with his new exhaust. He has a Bisson rear dump available now and I believe has a tuned pipe for it now. I run one of these beauties in my Edge and the power is awesome. Unlimited vertical and hovers at 1/3 throttle and the thing isn't even broken in yet. It also fits great in the cowl. I got 25 pounds of static thrust off of a Vess 22A right out of the box and it keeps getting better. There are a lot of DA, 3W, and BME guys at the field eyeing this engine for their next 30%. At $400 basic and $429 deluxe version you can't beat it for price or performance. http://www.wildharerc.com/products/engines/index.html

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< Message edited by Lou55 -- 6/17/2007 4:24:08 PM >

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Take Offs are Optional, Landings are Really Nerve Racking!! Al Lewis AMA #821623

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       Post #: 188

RE: 50cc Edge V2 has landed - 6/17/2007 5:12:45 PM   
TheFoxes


 

Posts: 109
Joined: 8/29/2003
From: Brooklyn Park, MN, USA
Status: offline 		My G62 runs perfect. Five flips to start cold, one flip once it's warm. Spins a Vess 23A just as as fast as a buddy's DA50 - but it is a lot heavier. I am wanting for better vertical. If the electronic ignition is really worth a whole pound, I'd be all over it. Seriously? Who do I call?

ff

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RE: 50cc Edge V2 has landed - 6/18/2007 3:33:02 AM   
Tired Old Man


 

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