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Flying the Great Planes XPD-8 EP / Miglet Ducted Fan Flying Wing

Old 11-09-2008, 08:23 PM
  #26  
Ejet42
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Joe,

We're usually pretty strict, as this is XPD-8/Miglet "Nose Ring Left" is sort of an "elite" club, but since you seem like an "all-right guy", I'll go out on a limb and say "Welcome"! Is your's stock or otherwise? What are you powering with?

H2
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Old 11-10-2008, 01:24 AM
  #27  
Joe 1320
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Thanks for the invite!

I use a Walkera 20mm 3200kV inrunner, 30A esc and 4s 1000 mAh lipo. Flies out of the hand or will rise off grass (weed whacker) with no drama. I'm going to try 5s if I can get the right cells and still have them fit under a hogged out canopy.
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Old 11-10-2008, 01:32 AM
  #28  
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Crashed twice today. Plane kept drifting to the left and then would spring back to the right. Then I would have to fight to recover. Ended up flying into a small bush that caused no major damage but left 1/4" branch indents on both leading edges. Other than the dents, no damage which was pretty amazing.

Upon careful inspection, it appears that the left elevon linkage may have been slipping (although it would have required a fair amount of force)

I fixed the linkage and repositioned the battery to move CG back to original forward position. Also re-balanced the fan (there was a small piece of one blade missing so I trimmed a little from two blades on the opposite side. Much quieter operation and no vibration.)



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Old 11-10-2008, 01:42 AM
  #29  
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Originally Posted by Joe 1320 View Post
Thanks for the invite!

I use a Walkera 20mm 3200kV inrunner, 30A esc and 4s 1000 mAh lipo. Flies out of the hand or will rise off grass (weed whacker) with no drama. I'm going to try 5s if I can get the right cells and still have them fit under a hogged out canopy.
I am going to have to go brushless on the XPD-8 that I bought on sale just to keep up with you guys. (Planning to leave the Miglet stock)



Clint
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Old 11-14-2008, 01:52 PM
  #30  
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Changed linkage but still not getting stable flight. Going to move CG forward another .125" and see if that makes a difference.

Plane just does not seem as stable as it was before I crashed into a picn ic table when landing. I had it dialed in to a point where I could launch and climb out without touching the transmitter but now I find myself having to do constant corrections.

(Damage to leading edge was repaired with 2 mil clear tape that conforms perfectly to contour of leading edge. I did not repair a couple other nicks that may have more impact than I realize so I will repair them too.)


Clint

Last edited by cbatters; 11-15-2008 at 09:07 PM.
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Old 11-15-2008, 05:12 PM
  #31  
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Clint,

I really would not think that any little "dings" would cause that - perhaps a non-responsive servo would, though. Ensure that both control surfaces are traveling at the same speed, from one extreme to the other. Every now and then, you will find two servos that work, but are not close enough in speed to be used as a "matched pair". I guess it is possible that component age could have a bearing on that also. Also, check for hysteresis (the difference in control surface position at neutral when approached from each extreme). This would also provide certain instability, and be impossible to "trim" out.

Henry
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Old 11-15-2008, 09:10 PM
  #32  
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Looks ok on a bench but may have issues under load while flying. I will try swapping out servos and see if it helps.

Question: What kind of servos are you running in your XPD-8?

Flew today and had one good flight before I lost control and popped into a low tree branch. I have had more crashers on the last few weeks than I have in a year, all stemming from what appears to be instability and a lack of control.


Clint
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Old 11-15-2008, 09:39 PM
  #33  
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Clint,

My servos are old Tower Pro 9g, just like the Hextroniks 9g's for $3.60 ea.

I just figured out a high probability of what your problem is -
Highest probability - the receiver. To test, while at your flying field, turn on the receiver and the transmitter with the antenna fully collapsed. Then move the transmitter approx. 100ft. away, set it down, walk back and observe your servos for about 20 minutes. Dollars to donuts, they will move or "jitter". With the tight wiring and a weak signal, this is a common problem. It may be manifesting itself now as the receiver/esc has aged and caps are changing in value.
Next, there may be "someone" that has found out how to cause you grief, or
Third, there may be another flying field semi-close by, causing grief unknowingly.

I went through a real round of crashes, never actually pinpointing the source of the problem - either malicious or tight packaging (noisy ESC, etc), but an upgrade to 2.4 gHz solved it. I still fly some 72 mHz, but not in "tightly packed" planes. I currently have a JR 8103 on Ch.45, and a 9303 on 2.4gHz.

Also, I have several Hitec 055 5 Ch. receivers as well as a "Blue Bird" (absolute POS) that I consider unfit for reliable service because of weak signal "jitters". I do have a couple of "Berg" 4 ch receivers that I believe are probably OK, and a FMA M5A and JR 700 that are also reliable.

All of that being stated, it may be time to step up into the DX6i or your choice of 2.4gHz radios. My recommendation is to stay with either JR or Futaba at this time. I believe that Hobby City is now pushing other brands, but I am uncertain of their quality. My experience confirms spending the bucks on a reliable radio - save on the ESCs/Motors/Servos and planes.

Henry
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Old 11-15-2008, 11:58 PM
  #34  
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Appreciate your input on servos and throughts about the control problem I am having.

I have done range test as you described and did not have any glitching. It never feels like the plane is out of range or glitching, just seemed like I did not have enough throw to control the plane.

Ureka!

I just did a test with another transmitter and am 100% confident the transmitter was the problem. Without changing anything on the receiver, the new transmitter nearly doubled the throw and it seems like servos respond faster.

I will try this tomorrow and see if it solves the problem.


Many thanks,


Clint
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Old 11-16-2008, 02:37 AM
  #35  
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Excited about flying tomorrow AM weather permitting. It has been several weeks struggling with instablity and sluggish response.



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Old 11-16-2008, 10:36 AM
  #36  
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Clint,

I surely hope that you have found the problem! I can't imagine what could cause that scenario to occur, but am not doubting that it is happening. What transmitter are you using anyway?

Good Luck on the AM flight. Lemmeno what happens.

H2
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Old 11-16-2008, 01:00 PM
  #37  
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I have been using a ZX10 HobbyZone 27 MHZ transmitter with a REC/ESC I salvaged from an old AB3 I bought for parts. Was working great for several weeks and then I started getting slow / sloppy response and I kept looking for something mechanical on the plane.

100% confident it is the transmitter because with the old transmitter I am only getting ~50% of the throw on the servos and I am not getting 100% throttle. New transmitter works like a champ.

Very windy out so it is not a good day to re-maiden after the repairs and a new transmitter.



Clint
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Old 11-19-2008, 01:46 PM
  #38  
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Still no chance to fly. Windy and cold in the North East.


Clint
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Old 11-19-2008, 04:06 PM
  #39  
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Southeast is no different. It was 44 and 10-15 mph winds this morning. I don't care how much I love the flight part of our hobby, I'm not standing out in that.
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Old 11-19-2008, 07:23 PM
  #40  
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Hi guys,
In the deep South, things are different - mid 30's this AM, but no wind. Now, 61 w/6mph from the west. No one to fly with - one retired buddy at the Casino, the other cutting hair today (and tomorrow).

I'll be leaving tomorrow for approx. 2 weeks in Lubbock, TX. visiting mom (94 on 12/3) and sister. Trying now to decide what planes to take, although it will probably be too windy/cold on the south plains this time of year to do much flying.
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Old 11-25-2008, 02:42 PM
  #41  
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Hey Clint,

Haven't heard how the re-maiden went ..... or has it as of yet. I noticed this AM that the weather in the MA area is cold and windy. In LBB this morning, it was 26, but expected to warm up to 72 or so. 10-20 mph winds today, but subsiding and temp moderating tomorrow and Thursday. May fly tomorrow. Surprised myself with being able to take 5 planes and 2 helis - have flown only the Eflite mCX so far (inside in the hotel room, of course).

Happy Thanksgiving to you and Joe 1320.

H2
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Old 11-26-2008, 02:04 AM
  #42  
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No joy on maiden - too windy - waiting for some reasonable weather.

Happy Thanksgiving.



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Old 11-27-2008, 12:21 PM
  #43  
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32 degrees - still air. Headed out to re-maiden.


Clint
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Old 11-27-2008, 12:38 PM
  #44  
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Good luck Clint, mine takes a hard toss. I usually have one of my flying buddies toss it for me.
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Old 11-27-2008, 01:21 PM
  #45  
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Flew like it was on rails. No twitching and very responsive now that I am getting full throw on the Elerons. Looking back, the other transmitter must have been failing for a while gradually leading to reduced control and unstable flying. Contrast was day / night as would be expected based on the control throw movement.

Thankful I got my great flying plane back.



Clint
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Old 11-27-2008, 01:33 PM
  #46  
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Congrats, Clint. Glad you got the problem figured out. Are you still stock, or have you made any other changes? Did you ever put a Whattmeter on this one?

H2
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Old 11-27-2008, 04:07 PM
  #47  
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Still stock. Hoping Santa will get me a Wattmeter or an Eagletree logger.

Red Miglet suffered a lot due to bad transmitter. (several serious crashes that required epoxy to get humpty back together)
Not sure yet if I am going to build out the XPD stock and enjoy a plane that has not been crashed or go for BL.



Clint
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Old 11-28-2008, 11:54 PM
  #48  
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Three great flights during the day and then I had a pretty serious crash. Overcontrolled during the launch causing the plane to go nearly vertical, stalled and then not enough altitude to gain airspeed and recover.

Moral to story - use low rates when launching.


Clint
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Old 11-29-2008, 02:13 PM
  #49  
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Hey Clint,

Sorry to hear about the mishap - Is it repairable? Do you think more power would have allowed recovery from the "nose-up" attitude? Sometimes I have gotten in trouble with low rates and low speeds - not enough control authority to change directions quickly enough. Typically when I "maiden" anything, I begin with the higher rates ............. and exponential!!

Still in LBB - poor flying weather - windy and cool temps. Probably won't attempt to fly until next Saturday in BTR. Anxious to put my XPD up again.

One of the younger guys that fly with us old retirees also has an XPD-8, and is having real problems fitting the electrical package under the hood. He has a 4040 kv (mine is 4400) 370S inrunner. Will be powered by a 3S 1000 mAh LiPo if he ever gets everything arranged and tucked in. Uncertain of the wattage but should be around or a little over 200.

H2
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Old 11-29-2008, 03:25 PM
  #50  
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Already repaired and re-maidened. (Used urethane glue to build out collapsed nose. Flies OK but have a bit of vibration that is robbing power. Much more controlled launch using low rates.

AUW has also risen to 12.3 ounces with 900 MAH 3S battery due to extensive repairs. (I may have to post a few pics of the war wounded Miglet.)

To answer your question, with more power and unlimited vertical I would not have stalled but I was clearly not in control. I deserved to crash.

FYI - Finally broke down and bought a computer radio. (Eclipse 7 with Spectra module.) MUCH more control over setting up the model compared to the cheaper radios I have been using.

Looking forward to building the XPD-8 and flying a clean airframe.

OMT - I have one 3S Thunder pack and several 3S Eflite batteries from helicopters. Much better power from Thunder Pack which suggests I will need better battieries to get much benefit from brushless.

Quickupdate: I just did a test fit and I can actually squeeze one of my 1500 3S batteries under the canopyby adding one more washer to the latch. Adds an additional 1.2 oz so AUW would be 13.5 oz.

More power - not sure how it will handle with additional weight.




Clint

Last edited by cbatters; 11-29-2008 at 03:45 PM.
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