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Goldberg Extra 300

Old 11-18-2016, 11:04 AM
  #1651  
acdii
 
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I take it it flies like a SIG Something Extra. I was a little skeptical about the plane being a hotter than normal plane, but it is actually docile when setup with low rates. Love the low stall speed and ability to harrier land. Doesn't knife edge well though, and thats not just mine, but a few others also have this issue where it wont get its nose up on a knife edge, guees it would need an oversized rudder.

One time while flying(thankfully at low rates) I did a loop, relaxed the stick and it kept looping. I had lost all elevator control, and my first thought is, Oh damn, not the CORNFIELDS!! So I did what I could to keep it as close to the runway as possible and found if I idled it would climb, stall, drop nose, climb stall, drop nose, so I just kept doing that while banking it around until I was near the runway, then killed the engine. I landed on the runway, and if I had one less foot of altitude on the last stall, it would have been a perfect 3 point, but that last foot dropped the nose too much and snapped the gear off. Saved the plane though, flew it again a couple weeks ago and it flew great. The elevator servo failed, so no more Hobby People servos, nor MPI servos, going to stick with Futaba from now one for controls, and JR/Spektrum, or Hitec for gear and flaps.

This sounds like a much larger plane since you are putting a DLE20 on it, which is what I have on my 4*120, and that plane is huge. I'll bet my OS Gemini would be great on this plane too, its on my Ultimate 10-300, which I have one quick flight on to test its flight characteristics before I sunk time into repairing and recovering it. Its an old plane, at least 20 years if not more and the glue joints are brittle, and the throttle linkage needs to be replaced/redesigned, I had very little throttle control, basically idle and a little more then WOT, or I would have flown it a bit longer, but I was impressed with how it flew and look forward to flying ti again.
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Old 11-18-2016, 01:32 PM
  #1652  
rye
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hi
the motor fits great, the servos in the tail were the right move the plane balances with out any weight
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Old 11-18-2016, 01:53 PM
  #1653  
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Nice bones view. Looks very similar in design to the CG Chipmunk I built a few years back. Same wing and tail structure. Thats another project i have to get back to, stripping my first fabric attempt with Rustoleum. Came out way too heavy and the white turned yellow.
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Old 11-18-2016, 02:06 PM
  #1654  
rye
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O chipmunk my favorite plane build 4 of them
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Old 11-18-2016, 02:29 PM
  #1655  
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we did a gaint a rv-4 painted the alt-coat covering with t-f black paint on the wings turn out great had to stuff the covering where the paint lay on
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Old 11-19-2016, 09:50 AM
  #1656  
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Hum I have never had and issue doing the knife edge either way with my plane, but im useing a YS 120 for power and if memory serves me right I did inhance the rudder some.
I also dont feel the plane flies anything like a something extra, its much smoother and more predicable. Landings are a no brainer, the only thing the plane won't do is fly 3-D with the exception of a so so hover, but for sport and imac it is great.
Im sure the 16x8 inch prop out front helps out in many ways as far as KE loops and so on, plus it is quite fast at full throttle.
Since I have went to the larger planes I seldom fly it now days, but its in the trailor ready to go just in case I get the urge one day.
Good luck with the build I would inhance the rudder some, but leave the elevator alone, the plane requires very little as it is.
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Old 11-19-2016, 11:36 AM
  #1657  
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That's good to hear. If I come across a kit of one, then I will see if I can pick it up and add it to my collection.
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Old 11-19-2016, 12:01 PM
  #1658  
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rye, Is the Extra you have pictured from a Goldberg kit?
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Old 11-19-2016, 01:56 PM
  #1659  
rye
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i got it from tower hobbies a year ago as a new kit
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Old 11-21-2016, 07:46 AM
  #1660  
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Continuing the build. Was able to get some work done on getting the wing halves built. I took my time and really slowed down for the wing build. The wing for the most part went together without issue but I did have to fight the under rib alignment tabs that kept wanting to break off when pinning the ribs to the building board. Due to shoveling / snow blowing and shopping for Snowmeggedon, here in Northern new York, I wasn't able to complete the wing. The following pictures capture my progress to date. One of the things that may be of interest is that when I join wing skin balsa sheets a technique I stumbled across by chance and works really good for me is to use the blue painters tape as a base substrate for the application of the glue and alignment of the sheet being attached. The tape holds the first sheet in place and allows you to run a bead of glue down the edge to be joined. Then you have an extra set of hands to hold the piece in place while you align and close the joint between the two pieces. Glue will seep from the joined edge to the surface where you can wipe it with a damp cloth to reduce sanding built up amounts of dried glue later. I use wood glue (Gorilla Glue) but any will work. I stay away from CA on sheeting surfaces due to its rather poor sanding qualities.




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Last edited by Thunderbolt P47; 11-21-2016 at 07:48 AM.
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Old 11-21-2016, 10:12 AM
  #1661  
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I use pretty much the same technique when gluing sheets. I have the 2" wide tape, and tape one side, fold it, glue it, then press it together and wipe, then apply a strip on the top and let it dry. I then place weights on top to keep it flat as it dries so the titebond doesn't warp it. They come out nice and flat.
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Old 11-21-2016, 11:16 AM
  #1662  
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Lookin' good Jeff. acdii's process is a very good one for sheeting. I have built two of these (and another kit on the shelf). The main change between #1 and #2 is that i ca'd in the "punch outs" for the lightening holes in the ribs on #2. After years of flying #1 the wing got mushy for lack of a better term. I think it was more just in handling it over the years rather than any flight loads. Just something to keep in mind as you finish yours is to handle the wing with care. Those 1/16 ribs are not overly strong to begin with.
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Old 11-21-2016, 12:37 PM
  #1663  
Thunderbolt P47
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Originally Posted by OldScaleGuy View Post
Lookin' good Jeff. acdii's process is a very good one for sheeting. I have built two of these (and another kit on the shelf). The main change between #1 and #2 is that i ca'd in the "punch outs" for the lightening holes in the ribs on #2. After years of flying #1 the wing got mushy for lack of a better term. I think it was more just in handling it over the years rather than any flight loads. Just something to keep in mind as you finish yours is to handle the wing with care. Those 1/16 ribs are not overly strong to begin with.
Steve,

Thanks for the compliment. Do you think I should add balsa to create a type of sheer web to reinforce the sides of the W2s where the punch outs used to be? Want to use a DLE 20CC on this and do not want to over stress the wing. Going with outboard aileron servos on this as it is my second one but first one built by me.

Jeff
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Old 11-22-2016, 07:20 AM
  #1664  
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Jeff, it would be a good idea to add the pieces you are referring to. The weight gain would be minimal.
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Old 11-23-2016, 05:57 AM
  #1665  
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Steve,

Ok will do. I am glad you brought that up because that is definitely something I would not have thought of doing. Appreciate the feedback and will take pictures of the "OldScaleGuy" Wing Structural Modification Improvements. MTF as building will continue in earnest tonight with the start of the long weekend! Happy early Thanksgiving to everyone! Jeff
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Old 12-03-2016, 10:44 AM
  #1666  
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Great to see this thread with some new life! Great progress - keep it light, and it will land slower than a trainer! This is video of mine taken this Thanksgiving (40 degrees F).

https://youtu.be/wMGi9DeE3RE
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Old 12-14-2016, 03:19 PM
  #1667  
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Scott,

Great looking Extra. Wish I was still flying at Thanksgiving! I am still here and will get the wing / fuse together this weekend and post pics. Latest update is the cowl is coming along with the Christmas presents from Fiberglass Specialties. Cost was decent and I have always appreciated their products. Will post pics upon arrival and work being completed. As for paint / trim scheme, I am looking at doing a Chicago Bears scheme with the Navy over White with orange white and black striping along with bears logo / bear head. Kind of like home and away jerseys. I know the Bears are awful but they are my team and I think it will look sharp in the air. I have a vinyl cutter so cutting out helmet parts / Bears logo will be easier than normal. "Da Bears!"
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Old 12-14-2016, 03:26 PM
  #1668  
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I have a better idea - you could put “Bear Down and Out for the Count” on the wings, and have a Bear lit on fire as it is crashing on to the gridiron of Lambeau field!! (Just kidding - your idea is great, I am just a Packer fan!!). Post picture of progress!


"I know the Bears are awful but they are my team and I think it will look sharp in the air. I have a vinyl cutter so cutting out helmet parts / Bears logo will be easier than normal. "Da Bears!"
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Old 12-16-2016, 04:16 AM
  #1669  
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Here is a kit available for any one looking (not mine, just passing information)
https://www.rcgroups.com/forums/show...IPPED%21%21%21
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Old 12-20-2016, 09:24 AM
  #1670  
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Hi guys.
Is there anybody who can provide templates to build the fuselage of this plane?
I have a wing kit with plans but on fuselage plan there are no templates to cut the bulkheads so i need a help.
Thank you
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Old 12-20-2016, 01:07 PM
  #1671  
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As I recall I sent a copy to Steve a few years ago. Mine aren't very good but they work. I just have no place to get copies made now but there are several guys on this thread with them. Maybe someone has them on disc?
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Old 12-20-2016, 01:29 PM
  #1672  
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Originally Posted by Gray Beard View Post
As I recall I sent a copy to Steve a few years ago. Mine aren't very good but they work. I just have no place to get copies made now but there are several guys on this thread with them. Maybe someone has them on disc?
I hope somebody could help me; i would like to build this nice bird but i am stuck without templates
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Old 12-20-2016, 05:39 PM
  #1673  
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You could always just wing it.
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Old 12-20-2016, 06:57 PM
  #1674  
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I have the plans, but they are stashed in storage, SOMEWERES.

I can hunt later on, maybe next month.
My left knee blew up. I'm hobbling around on cane. Getting very little sleep because of aforementioned stupid knee.

If no one can help you out, pm me in maybe a week. I would be glad to help you.
I was in the process of emptying storage out when my knee blew up on me. Waiting to get test results back.

All of my plane plans are in breivecase. So should not be hard to find.

Just kneed a bit of get back on legs (knees) time.
I my self have an unfinished 300 myself.

Ken
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Old 12-20-2016, 11:54 PM
  #1675  
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Hi flyingagin
I am sorry for your knee; i hope you'll be better as soon as possible.
Regarding the plans i have both of them (wing and fuse) but they don't help because there are no bulkheads templates on them. Unless you don't have something i miss.
I attached fuse plan i have so you can tell me if it's the same you are talking about; if it is it's useless.
Thank you
Attached Thumbnails Carl Goldberg Extra 300 - Fuselaga Plan.pdf  
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