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Goldberg Extra 300

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Old 12-22-2004, 09:50 AM
  #26  
plasticjoe
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Default RE: Goldberg Extra 300

Where's a good set of aluminum gear for the Extra ? I am not gonna jump in the pool with the wire gear.
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Old 12-22-2004, 10:13 AM
  #27  
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Default RE: Goldberg Extra 300

I´m using TNT CG Extra (3/16").

http://www.tntlandinggear.com/store/..._List_Gear.htm

( If you jump into the pool with the stock, you most probably will never get out of it...)

Good luck.
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Old 12-27-2004, 11:14 AM
  #28  
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Default RE: Goldberg Extra 300

I am building the CG Extra right now. I installed cowl, wheel pants and aluminum gear from Fiberglass Specialties. Gonna use a OS .91FX. As soon as i fly it I will report how is everything.
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Old 12-28-2004, 12:19 AM
  #29  
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Default RE: Goldberg Extra 300

my pops is building a cg extra 300 and went a little crazy with choosing the engine instead of getting a engine with a little more power needed to hang it buy the prop he went with a zenoha g-26 the smallest prop he could put on it clears the ground by 1/2 inch and about 2 mm of space inbetween the edge of the firewall and the backing plate of the engine i cant wait to see how much weight he has to put in the tail of the plane
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Old 12-28-2004, 08:43 AM
  #30  
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Default RE: Goldberg Extra 300

Hello these are the mods I made to my CG extra .
1. Fiberglass Cowl and pants ,Stans Fiber tech
2.Dubro Glass landing gear
3.Enlarged the rudder
4.2 servos in the wing
5.2 servos for the elevator
I used sullivan Metal horns on the rudder for the pull pull system. no plastic and dubro single bolt thru on the Elevators and ailerons.Also all 4.40 hardware. I did move my servos Rud & ele back to the next bay for more room ,the pull-pull is very close and a pain to get it to clear where the plans have it .Plus I didnt like that 1/8 lite ply servo mounting board, it can flex under heavy loads.

Mods I wished I would have done.
1.Moved the centerline of the elevators forward about 1 inch and added balance tabs
This mod is for 3-D flyers as this plane needs very small amount of input on the elevator anyway.

By going with the servos in the fuse and not in the tail I was able to maintain the CG balance point without having to add additional weight useing a 91 FX with a bisson in cowl muff.
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Old 01-07-2005, 08:09 PM
  #31  
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Default RE: Goldberg Extra 300

Flew one for about 2 1/2 years till battery came undone while playing with cg. You know the rest of the story. Had an OS 91 fx with a graupner 14-7 prop. Aluminum landing gear. Best plane I ever had. Would do flat spins perfect every time. Compare all the planes I fly to it. Keep it light and you will love it. It is not a 3-D plane. Fly it like it was designed.

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Old 01-12-2005, 01:30 AM
  #32  
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Default RE: Goldberg Extra 300

Some progress. The rudder will have more authority, also ailerons, it was a 3D kind of modification.
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Old 01-12-2005, 01:36 AM
  #33  
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Default RE: Goldberg Extra 300

The plane is on balance with the Saito 180 and a 6 volt 2700 map battery pack below the fuel tank and two elevator servos at the back. I need to paint the cowl now. The LG is a bit forward to avoid nose over. It is turning out just the way I wanted.
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Old 01-12-2005, 11:17 AM
  #34  
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Default RE: Goldberg Extra 300

Redrata, Looks great. I have my wings ready to be hinged with Robarts hinge points and tail feathers done and hinged. Ready to start the fuse. See you have 2 elevator servos and that is my plan also. What servos did you use? How did you arrive at the servo location? Looks like they are directly opposite each other. Any hints please.
Any help or advise will be appreciated.
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Old 01-12-2005, 11:48 AM
  #35  
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Default RE: Goldberg Extra 300

I am using two standard futaba servos, but at 6 volts. I should replace them by two Futaba 9001 later...... I am using one Y servo reverser at the tail. They are located just as back as possible so they almost touch each other inside the fuse. Also, I placed them up enough so they dont interfere with the pull-pull system which exits at the lower slot provided at the fuse. I am using a JR 4721 for my rudder. Two Royal multiplex at the ailerons.
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Old 01-14-2005, 12:55 PM
  #36  
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Default RE: Goldberg Extra 300

I have just finished construction of a Goldberg Extra 300. I have a Saito 100 engine, fiberglass Specialties cowl and landing gear, 3" tru-turn spinner and APC 15 x 6 prop. I have put two servos for the elevator in the tale. Checked the balance last night and it is 5 1/2 " from the leading edge. I have not weighted the plane yet or covered it, but it seems to be light.
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Old 01-14-2005, 01:08 PM
  #37  
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Default RE: Goldberg Extra 300

I have weighted mine, with a Saito 180, stans fiber cowl, TNT thickest LG, 2700 Expert 6 volt = 9,9 lbs (4.5 Kg)
This is a very good plane, it is not a Patty Extra from GP, but it is a nice kit that has been around for a long time and definitely fies incredible smooth. My plane is ready to fly now, just waiting for spring. I guess that yours could be around 9 lbs. or less.
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Old 01-18-2005, 10:15 AM
  #38  
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Default RE: Goldberg Extra 300

Guys, what are your recomendations for mounting the landing gear. I am using a TNT 3X16 and have beefed up the original mount with some larger 1/8 ply. Should I use 1/4X20 nylon or what and how many fasteners should I use? We have a fairly rough field and I won"t be using wheel pants. Have seen too many LG'S ripped off and the pants go up through the wing! Have a flying buddy that uses 2 1/4X20's and that is not enough. Your thoughts and ideas please.
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Old 01-21-2005, 06:35 PM
  #39  
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Default RE: Goldberg Extra 300

cafusin,

I have 2 Goldberg Extra 300's. I have seen canopies tinted using RIT brand clothing dye. You follow the directions on the box for clothes and take it out when it is dark enough. One of my Extras has a totally opaque canopy. The inside of the canopy is painted black and it looks pretty cool if you don't want to fool wit the interior.

My airplanes are 6 and 7 years old and I fly them the most of any of my airplanes. I have used OS 91 and OS 120 4 stokes. I love the way they fly on the 91's. They are so precise and smooth they look great. Vertical performance is not super everything else is great. They are just not as good on the 120's.

I fly off grass and bought the Stan's Fibretech aluminum gear, mounted it as far forward as I could and tilted it forward. The stock gear position is impossible on grass.

Of course I have fiberglass cowl and pants but otherwise I built it exactly like the plans on recommendation from other owners. Dave Patrick designed it so it must be right.

Bob
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Old 01-24-2005, 09:17 PM
  #40  
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Default RE: Goldberg Extra 300

Oh the memories. move the engine back and slide the cowl back.If Iremember I had to cut alittle of the cowl to clear the wing .This way the tail stays light. Makes it move quicker and stop faster(the tail end). also carbon fiber toeing glued to leading edge of elev. under sheeting just a small little bit about 4" from center out top and bottom. Also be careful when cutting covering not to cut sheeting on elevator.A 108 run it rich and you have the makins of the most fun plane I ever owned.Oh the memories
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Old 02-13-2005, 01:59 PM
  #41  
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Default RE: Goldberg Extra 300

ready to fit cowl to plane. I have a Fiberglass specialties cowl with the extra room for a Pitts muffler. Using an OS 1.08 for power. Need suggestions for fitting cowl. This is going to be a project! Have front opened and hole for cyl head. When I first " forced cowling on" I had to remove cyl head to get it off. Not good. Did any of you have to split the cowl? How am I going to mount Slimline muffler? Almost seems like I'll have to let the muffler loose in cowl, force the cowl over the eng or remove the cyl head, and then try and mount the muffler to the eng from inside the cowl. Help please as I am out of ideas!
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Old 02-13-2005, 04:12 PM
  #42  
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Default RE: Goldberg Extra 300

you can use rit clothing dye in a pot of water. use an old one so the others in the house don't get p.oed. then just wait until you get the degree of color you want.
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Old 02-14-2005, 05:20 PM
  #43  
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Default RE: Goldberg Extra 300

Hmmm. I have the same setup.
On mine i have to remove the needle valve, Cyl head. I had to shorten the exaust stacks also. It is a real clean looking install but a real pain to take apart if i ever need to get in there. A split cowl would work but i think it would be an even bigger pain then just dealing with it the way it is. FWIW
Pat
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Old 02-14-2005, 08:16 PM
  #44  
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Default RE: Goldberg Extra 300

Do you have a Slimeline muffler and a Fiberglass specialties cowl? Your install looks great! I am hoping that I won't have to relieve the cowl for the muffler. What prop are you using?
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Old 02-14-2005, 08:46 PM
  #45  
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Default RE: Goldberg Extra 300

Yeah its a slimline pitts muffler OS 1.08. Cowl is from stans fibertech and extended for a pitts muffler. It is all inside the cowl and needs no cutouts other then the exaust stacks and head, needle. The prop is an APC 14X10. I only have two flights on the plane yet but the performance is outstanding. I belive it is goign to be the best flying plane i have had my hands on so far.
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Old 03-01-2005, 05:10 AM
  #46  
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Default RE: Goldberg Extra 300

Well this is how far I am but Ido have a question, On the canopy how did you get the covering to stay on the plastic around the canopy when covering, The mods i have done is to enlarge the rudder, Put Stan's Fibretech aluminum gear, and since the picture Have mounted a servo tray midway in the tail for the elevator and will use the punched out wood from the fuse as a hatch to get to the servo's if needed, Just got to finish the hatch with the canopy and I'm not liking the way it is set up so I might change that a little but that's another story.

Thanx for any help
Dauntae
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Old 03-01-2005, 08:58 AM
  #47  
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Default RE: Goldberg Extra 300

I did not use covering on my canopy. I sanded, Primed, Painted it. It looks good and matches the cowl but it is about 2 shades off from the covering.
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Old 03-09-2005, 05:51 AM
  #48  
Dauntae
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Default RE: Goldberg Extra 300

Well this is build #3 and covering #3 and this is how it's coming so far, I'Ve never been acused of being subtle
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Old 03-09-2005, 06:05 AM
  #49  
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Default RE: Goldberg Extra 300

One of the mods I did was to use duel elevator servos but I hate servos sticking out of the plane soi used one of the punched out sections midway to the tail and hald the cover on with servo screws.
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Old 03-11-2005, 04:56 AM
  #50  
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Default RE: Goldberg Extra 300

This is a great thread and helping me to understand a little more about the aircraft.

I purchased an CG Extra 300 that was already assembled, covered, flown, and never crashed, and I got it with only the wing servos installed. Before I read the whole post I had already purchase the OE 3 piece cowl from CG. Now I have never had to join the plastic ones together. Do I just use a strip of fiberglass cloth and some 5 or 30 minute epoxy or just use straight epoxy?

Also, what is the measurement of the engine thrust bearing to the firewall? The CG website provides center of gravity, weight, throws, and engine selection, but all I think I need is the above measurement.

Thank you,
Brian
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