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Dirty Birdy ARF

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Old 06-25-2012, 08:10 AM
  #551
pjwright
 
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Default RE: Dirty Birdy ARF

Jeff's e-mail is jf_owens@comcast.net, Greg.

PJ
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Old 06-25-2012, 08:18 AM
  #552
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Default RE: Dirty Birdy ARF

I got it, thanks PJ. He tells me he's using a OS.61 pumper with the fuel tank near the CG and the receiver battery behind the servos... and still needs 2.5 to 3 oz of lead in the tail. So that confirms what I'm seeing in mine too (needs more weight in the tail).

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Old 06-25-2012, 08:45 AM
  #553
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Default RE: Dirty Birdy ARF

i think you will regret the pull pull on the outside , just my thoughts , but it is a great looking plane , that is my only concern
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Old 06-25-2012, 09:15 AM
  #554
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Default RE: Dirty Birdy ARF

OS .61 FX or .91 FX with tuned pipes... which is the best choice for the DB for ultimate performance?
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Old 06-25-2012, 09:46 AM
  #555
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Default RE: Dirty Birdy ARF

The .61FX.
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Old 06-25-2012, 11:11 AM
  #556
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Default RE: Dirty Birdy ARF

If you are using existing engines I would agree with AllThe GoodNamesAreTaken. But if not and going with OS I think I would use the 75AX.
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Old 06-25-2012, 11:32 AM
  #557
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Default RE: Dirty Birdy ARF

The OS 65AX with a MACS muffler, APC 11x7 and 15% fuel has plenty of power. As the engine breaks in, the rpm jest keeps getting better. I'm turning 13,300 - 13,400 consistently. Speed is easily around 100mph. I'm really digging this one!

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Old 06-25-2012, 11:32 AM
  #558
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Default RE: Dirty Birdy ARF

The DB will be slightly nose heavy (compensated with a rear mounted battery pack) with the .61 FX or the .65AX. The .75AX is 3oz heavier than the .65AX.
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Old 06-29-2012, 10:49 AM
  #559
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Default RE: Dirty Birdy ARF

Can anyone with an New DB ARF and an old Bridi Fiberglass fuse try putting the new wing on the old fuse ?

I have an original glass/foam kit but the wing cores were damaged long ago. I know I can order some new cores but for $135 for these replacements that are already skinned and routed for retracts ...
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Old 06-29-2012, 10:58 AM
  #560
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Default RE: Dirty Birdy ARF

I also have a glass fues and wondered the same.
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Old 06-29-2012, 12:36 PM
  #561
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Default RE: Dirty Birdy ARF

I had two of the original fiberglass fuselage kits back in the day. I have a new GP Dirty Birdy now. In this new version, the wing center section is recessed at least a couple of inches, like a giant "notch" for the fuselage to fit into. I suppose that you could build up/fill in that notch to see if the wing would work, but if I were doing it, I'd spring for the custom cut foam wing for your old style fuselage.

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Old 06-30-2012, 07:54 PM
  #562
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Quote:
...if I were doing it, I'd spring for the custom cut foam wing for your old style fuselage.

ChiefK

Thanks for the reply Chief ... Your oppinion is appreciated
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Old 06-30-2012, 08:08 PM
  #563
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Default RE: Dirty Birdy ARF

I put the new wing on my old Bridi fuselage. If you built up the fuselage gap I think it would work. I did notice while comparing the fuselages that the new canopy is a little larger and flatter on the top and that the fuselage on the new version is actually a little more squared off on the bottom. Oh, and the old fuselage is much more stout (thicker) in construction.
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Old 06-30-2012, 08:18 PM
  #564
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Default RE: Dirty Birdy ARF

A couple more shots.
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Old 07-01-2012, 02:00 AM
  #565
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Default RE: Dirty Birdy ARF

I completely agree with your comments, particularly the weight of those "old" fiberglass/epoxy fuselages. The downside of the new, very thin fuselage in the GP version is obviously sturdiness. I get the feeling, every time I pick up the airplane, that if I'm not careful I'll break it or split the seam if I squeeze a little too tightly. I seriously doubt that this fuselage will survive a flip-over landing (not that anyone reading this thread would ever do that).

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Old 07-01-2012, 09:26 PM
  #566
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Default RE: Dirty Birdy ARF


Quote:
ORIGINAL: kaosfan

I put the new wing on my old Bridi fuselage. If you built up the fuselage gap I think it would work. I did notice while comparing the fuselages that the new canopy is a little larger and flatter on the top and that the fuselage on the new version is actually a little more squared off on the bottom. Oh, and the old fuselage is much more stout (thicker) in construction.
Can you mesure the widthof the DB ARF fuselage ? Thank you.

I found the DB ARF instruction manual and measured the Futaba S3004 servo width (12 mm) and the (internal) fuselage width on the picture (54 mm).
Knowing that the actual S3004 servo width is of 20mm, theactual fuselage width is 90 mm.

I also measured the fuselage width on the original (I suppose so) Joe Bridi plan and I found it to be equal to 90 mm.

-Paul

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Old 07-02-2012, 05:48 AM
  #567
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KaosFan - THANK YOU Very much for those pictures !!
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Old 07-02-2012, 12:01 PM
  #568
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Default RE: Dirty Birdy ARF

Hey Guys,
A little info please!! Anyone running the OS 65AX ABL engine in their DB with the stock muffler?? As soon as Tower get the DB back in-stock, I will pick up one more and the OS 65AX engine. Any info will be a big help!!!
Thanks guys!!
BTW: HAd a blast with my DB yesterday. I am back in the 70's again!!!

Sonny
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Old 07-02-2012, 01:07 PM
  #569
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Default RE: Dirty Birdy ARF

Sonny,

I'm running an old Webra Speed .61. The O.S. .65AX is not a legal engine for SPA.

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Old 07-02-2012, 02:13 PM
  #570
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Default RE: Dirty Birdy ARF

Does SPA intend to address this as the currently produced .61 engine size because more and more rare?
Chris...
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Old 07-02-2012, 02:20 PM
  #571
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Quote:
ORIGINAL: ChiefK

Sonny,

I'm running an old Webra Speed .61. The O.S. .65AX is not a legal engine for SPA.

ChiefK
Thanks, ChiefK for the info. Now to find a Webra Speed .61!!!
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Old 07-02-2012, 06:53 PM
  #572
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Default RE: Dirty Birdy ARF

Paul, I measured the inside at the servo tray. Wall to wall on the fiberglass it came out about 87.5 to 88 mm. There is a radius on the glue joint at the tray that reduces it to about a usable width of 84 mm. The width of the servo cutouts are about 72 mm. Let me know if you need something else.
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Old 07-02-2012, 08:19 PM
  #573
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Quote:
ORIGINAL: kaosfan

Paul, I measured the inside at the servo tray. Wall to wall on the fiberglass it came out about 87.5 to 88 mm. There is a radius on the glue joint at the tray that reduces it to about a usable width of 84 mm. The width of the servo cutouts are about 72 mm. Let me know if you need something else.
Thank you very much for the info kaosfan. In fact Iwill maybebuild my own DB from scratch. I am all readytransposing the DB plan into metric units.
I like very much the DB ARF and it seems to me, as you have mentionnedin one ofyour posts, thatthereexist a few differences between the ARF andthe original DB.
I would like to find out whatthese differences areandadd them to the original DB.

On the original plan the external fuselage width is equalto 90 mm. I suppose it'sthe same for the ARF because the epoxy fuselage must be 1 mm thick so 1 +88 + 1 = 90 mm.
So the two fuselages are of the same width.
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Old 07-03-2012, 12:35 AM
  #574
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Default RE: Dirty Birdy ARF

I'm not hearing any discussion about engine rules changes for the 2-stroke variety. There's probably more 4-stroke flyers in SPA (especially in the "Expert" group) than 2-stroke flyers. In either case, O.S. is not the only option available. In fact, the Senior Expert class was won by a DB/OS .61 combo a couple of weeks ago.

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Old 07-06-2012, 05:52 AM
  #575
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Default RE: Dirty Birdy ARF

If you're into SPA, here's link. Though it looks outdated, the rules are still current:
www.seniorpattern.com/newsletter/Pack.PDF

There are other sites online which seem to confirm this as final if you google Senior Pattern Association Rules. These are mainly for those of us who want to compete in sanctioned events. But trying to 'out perform' anyone by engine size doesn't always fit. Pilot skill is the killer.

There are other sanctioned pattern competitions for those who like to blend super sonic speed (BPA), and I think I read 2 other types of pattern classes besides F3A.


IMHO, I prefer 2 stroke power for SPA over any other. One more note: anyone remember Dave Patrics video (Wring It Out) where he demonstrated virtually perfect manuvers using his Finesse with 120 4S? I believe this was built for F3A competition, something I couldn't keep up with. Many thanks to those who resurected SPA.

John
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