Classic RC Pattern Flying Discuss here all pre 1996 RC Pattern Flying in this forum.

Dirty Birdy ARF

Reply
Old 05-23-2012, 12:57 PM
  #476
AllTheGoodNamesAreTaken
 
AllTheGoodNamesAreTaken's Avatar
 
Join Date: Aug 2002
Location: Somewhere In, NC
Posts: 1,565
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

That's a photo from when we were doing full throttle run time tests after the tune pipe test was over. Needed to find something to tie the plane to so I used the mailbox. Flying a 3M glider in the front yard was exciting enough. A DB knife edge down the street is one trick I'll let my buddy Chris attempt....
AllTheGoodNamesAreTaken is offline  
Reply With Quote
Old 05-23-2012, 01:54 PM
  #477
Free Bird
 
Join Date: Nov 2005
Location: Farmington, CT
Posts: 2,230
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

Here's mine at the field ready to go after running several tanks. OS 64AX, stock muffler, APC 11x7, Cool Power 15% and after 4 tanks it's turning an even 13k. For the moment I'm using the stock tank, and I timed an engine run and as expected it's a dismal 6 minutes. That means 5 minutes on the timer. [:@]

BTW - my DB is very nose heavy, battery (Hobbico 2S 2100 LiFe) is as far back as it can go, gonna need several ounces to bring the CG in the middle of the range. Where is everyone elses balancing?

P7, meet your new brother, DB!!
FB
Attached Thumbnails
Click image for larger version

Name:	Da83553.jpg
Views:	26
Size:	186.4 KB
ID:	1765241   Click image for larger version

Name:	Sn42359.jpg
Views:	27
Size:	331.5 KB
ID:	1765242   Click image for larger version

Name:	Db84334.jpg
Views:	26
Size:	178.2 KB
ID:	1765243   Click image for larger version

Name:	Je99490.jpg
Views:	27
Size:	335.0 KB
ID:	1765244   Click image for larger version

Name:	Db84168.jpg
Views:	36
Size:	132.4 KB
ID:	1765245  

Click image for larger version

Name:	Zu65672.jpg
Views:	51
Size:	182.8 KB
ID:	1765246  
Free Bird is offline  
Reply With Quote
Old 05-23-2012, 02:03 PM
  #478
ChiefK
 
ChiefK's Avatar
 
Join Date: May 2008
Location: Foxfire Village, NC
Posts: 759
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

I don't want to look!

ChiefK
ChiefK is offline  
Reply With Quote
Old 05-23-2012, 05:45 PM
  #479
AllTheGoodNamesAreTaken
 
AllTheGoodNamesAreTaken's Avatar
 
Join Date: Aug 2002
Location: Somewhere In, NC
Posts: 1,565
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

Just got back from the field with my buddy Chris. All I can say is WOW! Its everything its supposed to be. Fast, smooth, locked in and precise. Huge thumbs up!
AllTheGoodNamesAreTaken is offline  
Reply With Quote
Old 05-23-2012, 08:04 PM
  #480
rogera
 
Join Date: Mar 2005
Location: Dubai, UNITED ARAB EMIRATES
Posts: 34
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

Can everyone please read the title of the thread, I am 100% sure it states "Dirty Birdy ARF" and not a slanging match between OS Engines. Come on guys, let's hear all about this great aircraft and what it is like to fly.

We all have engine preferences and at the end of the day we just enjoy the aircraft with whatever engine it uses.

Just my 2c worth and hope the forum gets back on track soon.

Off on a weeks holiday to the Maldives tomorrow so will catch up when I get back. Hope to see many more flight reports soon.
rogera is offline  
Reply With Quote
Old 05-24-2012, 02:53 AM
  #481
Skylane
 
Skylane's Avatar
 
Join Date: Oct 2002
Location: Tallahassee, FL
Posts: 294
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

The guide tube for the rudder pushrod seems to have a curve in it so that there is a fair amount of friction between the tube and the pushrod. This will affect rudder centering. Has anyone else noticed this problem? I'm considering going to a pull-pull arrangement or a standard solid pushrod. Has anyone else considered or made such modifications?

Jeff
Skylane is offline  
Reply With Quote
Old 05-24-2012, 03:04 AM
  #482
AllTheGoodNamesAreTaken
 
AllTheGoodNamesAreTaken's Avatar
 
Join Date: Aug 2002
Location: Somewhere In, NC
Posts: 1,565
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

Jeff, my buddys plane is built box stock with $15 Futaba S3004 analog servos and we havent seen any issues with rudder or elevator friction. I didn't notice any friction before the servos were attached though.
AllTheGoodNamesAreTaken is offline  
Reply With Quote
Old 05-24-2012, 03:07 AM
  #483
ChiefK
 
ChiefK's Avatar
 
Join Date: May 2008
Location: Foxfire Village, NC
Posts: 759
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

Glad to hear it Jeff. I'm thinking that tomorrow might be a great day to get some airtime. Swapped out my Webra Speed (metric crankshaft) for another Webra (standard 1/4" shaft) yesterday, so I won't have any further delays with the problems that created. Fixed a little issue with the throttle rubbing on the cowl. Gonna check the CG today - even though I think it's pretty close to where it should be. Also got a new K-61 (RJL) carb for my Kraft .61, Tower Kaos 60, so I think I can have some quality time and some fun with these.

Since you're so pleased with your DB, would you possibly be interested in joining me at a SPA contest in Asheville in July? (You don't have to be a member to participate)

Greg
ChiefK is offline  
Reply With Quote
Old 05-24-2012, 04:56 AM
  #484
AllTheGoodNamesAreTaken
 
AllTheGoodNamesAreTaken's Avatar
 
Join Date: Aug 2002
Location: Somewhere In, NC
Posts: 1,565
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

Here's a very short video of the DB in action on the maiden flight. Just some rolls and a high speed pass. I took this with my cell phone. Chris will have better video shortly.
[youtube]http://www.youtube.com/watch?v=mO6boCcA6ak[/youtube]
AllTheGoodNamesAreTaken is offline  
Reply With Quote
Old 05-24-2012, 08:18 AM
  #485
lfinney
 
Join Date: Feb 2008
Location: kuna, ID
Posts: 896
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

my fuselage had one rudder pushrod tube that was defective,i removed it and am fitting a new tube, and am fitting pull-pull cable system, the defective tube was also loose and fell out...
lfinney is offline  
Reply With Quote
Old 05-24-2012, 09:08 AM
  #486
Sport_Pilot
 
Sport_Pilot's Avatar
 
Join Date: Jan 2002
Location: Acworth, GA
Posts: 16,887
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

The Dirty Birdy is fast with the old cross flow engines of the day when it came out. Now it is really really fast with a modern engine and pipe!
Sport_Pilot is offline  
Reply With Quote
Old 05-24-2012, 10:23 AM
  #487
vertical grimmace
 
vertical grimmace's Avatar
 
Join Date: Mar 2004
Location: ft collins , CO
Posts: 7,137
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF


Quote:
ORIGINAL: AllTheGoodNamesAreTaken

Just got back from the field with my buddy Chris. All I can say is WOW! Its everything its supposed to be. Fast, smooth, locked in and precise. Huge thumbs up!
That is great to hear. So you are happy with the OS .65 ax? I am thinking of getting this engine for my Sun Fli 5. Now that I am finally getting close to finishing it.
vertical grimmace is offline  
Reply With Quote
Old 05-24-2012, 11:05 AM
  #488
AllTheGoodNamesAreTaken
 
AllTheGoodNamesAreTaken's Avatar
 
Join Date: Aug 2002
Location: Somewhere In, NC
Posts: 1,565
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

After owning a few variants of the FX line, I was skeptical about the .65AX, but I have to say that I am impressed with it. I wouldn't hesitate to buy another.
AllTheGoodNamesAreTaken is offline  
Reply With Quote
Old 05-24-2012, 12:08 PM
  #489
hook57
 
Join Date: Aug 2009
Location: North Aurora, IL
Posts: 945
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

"O.S. .61FX 11.3K to 11.8K on stock mufller, 11x7 Rev-Up,using 10% home brew, was plenty fast with plenty vertical. Same O.S. .61FX in 7.5 lb H9 P-7 last season on same prop, same fuel,flew fine but could've used more rpms for stronger vertical. Same O.S. .61FX this season on same P-7 with APC 11x7, same fuel, but with Macs long header and 1062 quiet pipe is running 13.2K to 13.8K and it's on the rich side"

Apples are apples and oranges are oranges. Since a few of us plan to put the FX in our DBs the talk of engine performance is not outside the scope of the thread (rogera), but apologies to the OP if we did get off track
hook57 is offline  
Reply With Quote
Old 05-24-2012, 01:21 PM
  #490
Free Bird
 
Join Date: Nov 2005
Location: Farmington, CT
Posts: 2,230
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

I flew my DB this morning and it was a VERY successful outing! As I mentioned above, my DB is somewhat nose heavy and I needed 3 oz to bring the CG near the middle of the range. It's still too nose heavy for my liking and will need at least a couple more ounces.

OK, flight report: OS 65AX, APC 11x7, Cool Power 15%, stock muffler and it's turning a solid 13K. The engine is breaking in nicely as after several flights, it sounded a little rich and I limited my flights to 5 minutes (stock 8oz tank). Takeoffs from a grass field are a no brainer, just keep'er straight and add a little elevator when flying speed is reached. The Hobbico mechanical retracts worked perfectly. Trim needed was a few clicks of right aileron and several of up elevator. The speed of the DB was extremely impressive, it's almost as fast as my P7 (Evo 61NX, pipe, 11x6, Cool Power 15%, 15,500 rpm). First flight was spent trimming and getting a feel for the DB, I also did several stalls and it never fell off the wing, just dropped the nose and mushed straight ahead. Nice! The first landing was a greaser, as the DB does slow down pretty good, albeit it does take a little while cause the airframe is so clean. I'm starting with the recommended throws and ran out of elevator on the flair, moving the CG back will help that and also will help slow it down sooner on approach.

The next several flights were nothing less than very satisfying, the DB tracks very well. I flew just basic maneuvers and it did so very easily, loops tracked well and were as large as you wanted, rolls were very axial, but were just a little too fast on the recommended low rates. The recommended low rates, except aileron were too soft for my taste, again moving the CG back will help there. Surprisingly, inverted flight required very little down elevator to maintain level flight. Also, there was very, very little coupling during knife edge. And vertical with the OS 65AX is not lacking at all.

Yesterday I put in several flights on my P7 so I have a pretty good baseline for comparision. While the P7 is a great flying pattern ship, it feels just a little bit edgey compared to the DB. Speed wise it has an advantage over the DB because of the pipe. But the DB I think is a little bit smoother and gracefull than the P7. Both takeoff and land the same, and they look simply awesome doing on the deck high speed passes with the gear tucked away! Either way both are fun to fly and I'm looking forward to many fun flights on the DB!

FB
Free Bird is offline  
Reply With Quote
Old 05-24-2012, 04:05 PM
  #491
patternflyer76
 
patternflyer76's Avatar
 
Join Date: Aug 2006
Location: Fletcher, NC
Posts: 196
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF


Quote:
ORIGINAL: Skylane

The guide tube for the rudder pushrod seems to have a curve in it so that there is a fair amount of friction between the tube and the pushrod. This will affect rudder centering. Has anyone else noticed this problem? I'm considering going to a pull-pull arrangement or a standard solid pushrod. Has anyone else considered or made such modifications?

Jeff
Jeff:

Once I saw the rudder tube I knew that it was not going to work out for a friction free set up as well too. I decided to go with my rudder servo mounted in the bottom outside of the fuse aft the wing, pull-pull. It has taken some grinding and modification, but it worked out fine. It also helps to balance my 6s pack out.

Kevin
patternflyer76 is offline  
Reply With Quote
Old 05-24-2012, 04:09 PM
  #492
vertical grimmace
 
vertical grimmace's Avatar
 
Join Date: Mar 2004
Location: ft collins , CO
Posts: 7,137
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

That video was very impressive. Very fast. All the guys at my club would call it a racer!
vertical grimmace is offline  
Reply With Quote
Old 05-25-2012, 04:41 PM
  #493
ChiefK
 
ChiefK's Avatar
 
Join Date: May 2008
Location: Foxfire Village, NC
Posts: 759
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

Thwarted again..... took the DB out for it's maiden flight today, but NO-GO due to a problem with fuel tank. Taking it out - putting it back in. Try again soon. Flew my Kaos 60 instead.

ChiefK
ChiefK is offline  
Reply With Quote
Old 05-27-2012, 12:13 PM
  #494
ChiefK
 
ChiefK's Avatar
 
Join Date: May 2008
Location: Foxfire Village, NC
Posts: 759
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

Quote:
ORIGINAL: ChiefK

Thwarted again..... took the DB out for it's maiden flight today, but NO-GO due to a problem with fuel tank. Taking it out - putting it back in. Try again soon. Flew my Kaos 60 instead.

ChiefK
Finally got the DB into the air. First did some fuel run testing, then with 7-8 mph crosswind, taxied it out. Outstanding first flight. Very smooth, did everything I know how to do in this first flight. Slowed down for landing nicely and softly touched down right in front of me.

Balance: used 3/4oz to offset sidemounted engine, and three oz in the tail to hit the cg right on.

I love it!

ChiefK
Attached Thumbnails
Click image for larger version

Name:	Ec87248.jpg
Views:	30
Size:	357.5 KB
ID:	1766280   Click image for larger version

Name:	To43154.jpg
Views:	36
Size:	414.4 KB
ID:	1766281  
ChiefK is offline  
Reply With Quote
Old 05-27-2012, 03:08 PM
  #495
jet22b
 
jet22b's Avatar
 
Join Date: Aug 2006
Location: Olympia, WA
Posts: 2,009
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

Free Bird,
In your flight report, you said you have the Hobbico mechanical retract in your DB, may I ask how did you get rid of the side play in the main gear?? My first flight was off of a pave runway that my club can use only two times a year, but at our grass field the plane would not taix out of the pit to the run up box. Now when the gears is down, they are lock, but still have the side play. I have check all the screws on the case to make sure they are tight and they was, but still have side play. Any info will be a big help!!
Thanks you!!!

Sonny
aka
jet22b
jet22b is offline  
Reply With Quote
Old 05-28-2012, 04:25 AM
  #496
Skylane
 
Skylane's Avatar
 
Join Date: Oct 2002
Location: Tallahassee, FL
Posts: 294
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

Thanks, Kevin. It turned out that the pushrod tube was a bit too long, so when it was glued in at the factory it had a bend in it. I pulled it out and reglued it and it is now much better. I don't yet know how the CG will turn out, but your solution would certainly sounds like a good way to counter a forward CG.

Jeff
Skylane is offline  
Reply With Quote
Old 05-28-2012, 07:35 AM
  #497
patternflyer76
 
patternflyer76's Avatar
 
Join Date: Aug 2006
Location: Fletcher, NC
Posts: 196
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

Pics of the home made battery tray.... A lot closer to the CG I am wanting. I can still get it in and out through the nose gear well as planned before. Better then what I thought.

Attached Thumbnails
Click image for larger version

Name:	ay75132.jpg
Views:	40
Size:	492.6 KB
ID:	1766697   Click image for larger version

Name:	gb90551.jpg
Views:	40
Size:	572.3 KB
ID:	1766698   Click image for larger version

Name:	ot47868.jpg
Views:	43
Size:	633.0 KB
ID:	1766699   Click image for larger version

Name:	ex68266.jpg
Views:	41
Size:	591.1 KB
ID:	1766700   Click image for larger version

Name:	my25427.jpg
Views:	37
Size:	542.3 KB
ID:	1766701  

patternflyer76 is offline  
Reply With Quote
Old 05-28-2012, 11:53 AM
  #498
Doug47
 
Join Date: Apr 2004
Location: Ashland, OH
Posts: 377
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

Quote:
BTW - my DB is very nose heavy, battery (Hobbico 2S 2100 LiFe) is as far back as it can go, gonna need several ounces to bring the CG in the middle of the range. Where is everyone elses balancing?
Mine was nose heavy too, even with the receiver battery very close to the rearmost former in the radio compartment..
I know all about 'tail heavy planes may only fly once', etc.,etc. but I never fly a new model with the c/g forward of the forward most recommendation, they fly like such pigs and don't want to slow up to land, the knife edge blows,etc..
In this case I went ahead though and flew it with the c/g about an 8th inch in front of the recommendation and the little missle flew just great, it didn't have any of the nose heavy characteristics I'd expect. Hmmm.
I'll have to move it back with a heavier receiver battery I guess, I'm certainly open to hearing anyones views on this crates c/g wise or anything.
That E-Flight electric gear continues to pleasantly suprise me. I'm not used to going home after a few flights off a grass field with a retract equipped plane with nothing to fix or adjust. Doug
P.S.-patternflyer76 you are doing a helluve job on that electric conversion, very nice work.
Doug47 is offline  
Reply With Quote
Old 05-30-2012, 07:46 AM
  #499
kochj
 
Join Date: Dec 2005
Location: Victoria, MN
Posts: 3,923
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

I actually LIKE to hear opinions from guys who have said engines, and have run them, and have something to say about it....

It is, in fact one of the Largest discusions of ANY airplane forums, asking about WHAT engine to use....
Very relevent IHOP...to the posting DB....
kochj is offline  
Reply With Quote
Old 05-30-2012, 08:33 AM
  #500
PatternPilot
 
PatternPilot's Avatar
 
Join Date: Nov 2002
Location: Knoxville, TN
Posts: 1,780
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Dirty Birdy ARF

What S and MAH pack and motor and prop for the EDB?

cpa#2
PatternPilot is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 07:46 AM.