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Goldberg Extra 300

Old 10-19-2020, 08:47 AM
  #1926  
Britflier
 
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Steve, the CF landing gear I got from Hobbyking is part number 445000110-0
Old 10-23-2020, 05:24 AM
  #1927  
Steve
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Originally Posted by Britflier View Post
Steve, the CF landing gear I got from Hobbyking is part number 445000110-0
Thanks!!
Old 10-24-2020, 03:12 PM
  #1928  
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Wow what a huge thread on this model! Im not going to read it all.... but is there a summary post with some must do tips/changes? I read about the reinforcement in front of the wing.
Its going to get an OS 91 FS for powa

I just got one for the immense sum of $0 dollars canadian. Its had a tuf life, the front had some damage and repair...looks lie a decent job and no shortage of epoxy. It came with some sort of cowl but not OEM, but for now it will do.
I had visions of it taking my beautiful running, cdi converted Stihl 27cc gasser, but its just going to be a tad heavy. I did see a youtube of one with a rcgf 23cc gasser twin, to the tune of 5lbs, and sure it could fly with that weight, but I dont want a pig with wings
Anyone run the servos for elev/rudd in the rear, hanging out of the fuse? Like many modern designs do now...
I have no landing gear with it, was thinking of making some out of music wire...doubled up....yes/no?
Here it tis in its glory....after wiping off 3mm of dust



Last edited by kamlooper; 10-24-2020 at 03:22 PM.
Old 11-15-2020, 09:07 AM
  #1929  
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Progress on the Wizard Extra clone. I have a large gap between wing and fuselage. I don’t remember it being this way on my original. I can take care of it if I need to. Another issue, the wing incidence is negative 0.5 degrees. I wonder if these two problems are connected ?
Has anyone else


seen this problem ?
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Old 11-15-2020, 09:34 AM
  #1930  
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put some foam tape around it and see if it takes the -5 out.
Old 11-15-2020, 11:21 AM
  #1931  
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That gap is actually fairly normal. Some more some less.
kamlooper: I fly mine with a OS 1.08FSR. it's the perfect engine for it and it looks like your cowl is cut for 1 already also.
Old 11-17-2020, 06:07 PM
  #1932  
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BankYank yea I would have bought one if a deal came up but this 91 did and I snagged it. I since picked up another cowl, its similar looking to the above but fits better, more snug, and I think its cut out for the 91, also acquired some landing gear
Whats the Wizard close, a copy of the Goldberg?
A NIB CG kit recently sold for $150cdn over in ontario, what a bargain. You couldnt get one cut for that now adays.
Old 11-21-2020, 05:36 AM
  #1933  
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Guys this thread is a very long one and for good reason....the CG Extra was an extremely popular and an excellent flying model. One good tip to bear in mind is the model has a tendency if flown from grass fields to nose over during takeoff runs. While holding some back pressure certainly helps here, the fix is to rotate the main gear forward so that when the fuse is level the the main wheels are ahead of the leading edge by 1.5". I simply added a 3/8" thk, hardwood wedge plate between the fuse and the alum l/gear I used to achieve this.

My Extra is now 25 yrs old and has been flown with a wide array of engines starting from a ST.61 up to its current engine, a Zenoah 23 converted to CDI by Ralph Cunningham which is a testimony to its excellent design features, as during this time it has never exhibited any bad habits, retaining its reputation of being a tiger in the air and a *****cat to land. For sure its the best flying model of this size I have ever flown.

Last edited by karolh; 11-21-2020 at 05:41 AM.
Old 11-21-2020, 09:08 AM
  #1934  
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HEHEH the forum software doesn't like puddytat.
Old 11-21-2020, 09:55 AM
  #1935  
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@karolh Nice tips. Do you know the weight of your Zenoah? I thought a gas would be a bit heavy for this bird.
Old 11-21-2020, 12:56 PM
  #1936  
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Originally Posted by kamlooper View Post
@karolh Nice tips. Do you know the weight of your Zenoah? I thought a gas would be a bit heavy for this bird.
When I first installed the G23 in my Extra it was dead stock at 3lbs.2 ozs, required approx. 9 ozs of ballast in the rear to achieve a respectable CG and gave the model an AUW of 11.5 lbs. Even at this weight the model flew quite well but did not have the performance I wanted. Having the engine converted to CDI reduced its weight by approx. a pound and locating both ignition and Rx batteries at the rear made removing the ballast weight possible. The model's AUW is now 9lbs.12 ozs, has unlimited verticals and is a dream to fly.
Old 11-21-2020, 12:58 PM
  #1937  
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Originally Posted by acdii View Post
HEHEH the forum software doesn't like puddytat.
You got that dead right.

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