RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

I pretty much built the wing according to the instruction (no sheeting on the LE). Any twisting that I found I was able to correct with the covering iron.

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

Crossman.. thanks.... By twisitng I meant a weakness lengthwise as if you grabbed the root and tip and twisted. I was thinking of putting some sheeting up there but I'll pass to move the build along since it's a very well tested design..

I made more progress. The horizontal stab is complete with initial sanding. I need to round over the leading edge and streamline the tips and ends of the elevator. I sanded the V in the leading egde of the rudder and rounded over the top. On the wing, I added all the shear webs doing the backside which go out until the 5th bay. I let those dry and then did the front side which run the entire length of the wing. I stood the wing on it's leading or trailing edge depending on the webs added to be sure the glue would not run and remain in that web / spar joint. I used blue painters tape to hold them tight to the spars as it comes off easily but sticks well. The clamps on the end held one side with tape on the other due to the sheeting being in the way. The wing tip came out real nice. This seems like a very light wing as wings go. Should make for nice performance.

I was studying the manual and I think I'm going with the bolt on option. I've done this enough to know where I need to add strength above and beyond what they show in the addendums. For instance, they have the dowel just butt jointing into the bottom spar. I plan to angle the dowel a bit more and let it be captured / expoxied into a hole in the ply dihedral brace. I also will add another brace farther down the dowel by the leading edge for add'l support. Then pick up with the instructions again and sandwhich the whole shebang between ply ribs. I will add additoinal doublers in the frontal area of the cabin as well. It looks like I can add all this after the basic fuse is built so I will point out what I am doing that is extra.

For those new to kitbuilding , the second wing always goes faster than the first since you don't need to read the instructions [sm=wink_smile.gif] as you already know the order and have figured out how your going to clamp, etc, etc. I will put the servo wells in the wings once they are both built and joined together. In the past I have hidden the servos under a hatch with a opening for the "arm" to stick out perpendicular from the wing bottom . I think this looks nicer than seeing the top of servo and arm fully exposed. It's a bit more work as you need to mount the servo sideways but I think worth it. I use minis (not micros) as they have more than enough torque and are easier to fit in smaller spaces. (so much for not being wordy [sm=72_72.gif] )

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

Mike,

Your wingtips look great! That was the first change that I wanted to make on my Eagle. I was never happy with the originals.

I did the bolt-on wing option several years after I completed the plane. Obviously, it would have been much easier to do during the build. As I recall, I put a piece of 1/4 stock, either ply or hardwood, on the windshield side of the front cabin former. Since I didn't use the clear windows, I could build it up as much as I needed to. The whole windshield area is blocked out with balsa and covered so nothing shows. My concern at the time was that the hole in the former ended up pretty close to the top edge. With the downward angle of the dowel, I was able to extend into a stronger piece of wood. It seems to be working. I think the bolt-on wing is quicker to mount and looks better, plus, with the rubber bands, I was never sure if it was in the right position.

Do you plan to sheet the tail? Or are you leaving it open-frame?

Keep up the progress reports.

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

We were away this weekend in Gainesville for the gator homecoming festivities and game. The game was a but closer in outcome than I like but my Gator's prevailed.

Late last week I started framing up the other wing with ribs, sheeting, etc and tonight I flipped the whole thing over and added the top spar. Tomorrow I will add the shear webs and wing tip. I flip the wing over so the glue remains in the spar/rib connection and forms a nice fillet. To ensure there is no twist being built in since the wing is no longer resting on the bottom flat part of the rib, I pin down the top spar and take the two pieces of aileron stock and wedge them under the leaing and trailing curvatures using a level to verify all the ribs are level front to back and the wing is level left to right. As a tip, i have long used the wooden coffee sticks from starbucks to make fillets, they have a nice small radius. Popscicle sticks work well when a large fillet is needed.

I was thinking more about the engine mounting on the drive home today. I realized I cannot rotate the engine 90 degrees as i did wth say my 4 star. 40 (RIP [&o] ) taildragger as the nose gear will be in the way of the muffler. So I'm still going to rotate the engine maybe 75 degrees or so. I will need to do some trial and error ands see how close I can get the muffler to gear w/out it interfering.

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

I have been working on the second wing and it is at the same pt of completion as the first. They need to be joined, bolt on wing option put in place and top center sheeting with the glassed center section.

I wanted to start the wing mounted servos but found I did not have the ply I needed in my scrap [:o]. So I started punching out the fuselage pieces and gathering everytihng up. Building the fuselage has always been my favorite part of construction. After puncing out the pieces for the lightening holes in the fuse, I found I did now have the pieces I needed. ;). I didnt tihnk about the lightening hole scrap. So I bagged up the now loose fusleage formders, etc and started on the servo mounts. The pic shows it taped in place but you can see what I'm going for. The ply will fit snugly between the ribs with the servo mounted on its side. It will screw into hardwood supports and I usually box it in as well. I add hardwood supports on the ribs for the square-ish mount to sit on and be screwed into at the 4 corners. I have used servo mount screws in the past with no issues. The opening needs to be fine tuned still for arm movment. I use mini's as they only have a few ounces less torgue than standards but since they're driving only one aileron it's not an issue plus they're easier to fit. Hope to get those both completed tomorrow evening.

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

I am currently building an eagle 2 as well. I am doing quite a few conversions on mine to make it a better float plane, but I think they would be pretty sool for a conventional gear trainer as well. I am installing "scale-sized" flaps (with seperate servos), I did the bolt on option, and also did dual aileron serovs. I'm not 100% what I'm gonna do for the wingtips yet, but I'm thinkin solid balse blocks sanded to shape, and then cut ou the fron corner for NAV lights. Here are some pics of the wing partially completed.

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

Agree.. the flaps will be a fun to play with. I'm trying to keep the build as close to the kit as possible as that was my initial intention with this thread. But it's difficult as I like to bash a bit.

The pics show:
1) Hardwood rails attached to the ribs with balsa 3/16 x 1/4 cross brace. The rails are recessed the thickness of the top ply plate and the balsa is flush with rib bottom. The cutout on one side is to match the hole in the plate for the servo arm. Under the rails are tri-stock just for some extra support. The rails will a) prevent outward bowing of the ribs when covering is applied b) provide a shelf for the ply plate holding the servo to sit in and be flush with rib bottom and c) provide hardwood in each corner for the screws to mount the plate to the wing.

Work work has gotten in the way recently [&o] so I'll do some more this weekend on the servo piece and then we can join the wings.

A chopper was flying LOOOW over our house spraying so I took a couple pics... one shows him on a flyby.. the other doing a 180 almost in a hammerhead fashion over the preserve.

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

Mike,

I just noticed the line in your first post about the Eagle II not being a mainstream beginner plane. Two things came to mind:
1) When the Eagle II came out is was among the top drawer trainers. Not just to learn to fly but to learn to build as well. And 2) My Eagle sat in the basement for about 12 years between finishing and flying (Life got in the way, as they say.) When I did start flying 3 years ago, I was one of the few that didn't show up with a fresh out of the box red and white Nexstar! It's much easier to follow your plane in the sky when it doesn't look just like the other three that are up there with it.

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

Right.. what I meant was not by today's standards..
And yes.. thats why I build and kit bash on top of it. I showed up with a four star build some time ago, that some didn't recognize :D.

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

The wing servos are completed on both panels. I'm going to work readying the panels to be joined tonight, being sure all the conact points meet and have the proper bevel for the required dihedral and being sure the leading / trailing edges are in a straight line with each other. Instructions state the least dihedral option is 2 and 1/4 inches when propping up one tip meaning 1 and 1/8" for each top from horizontal.

Pics show the opposite hardwood rail relieved to accept the bottom of the servo. The servo is screwed in place into the hardwood blocks epoxied to the hatch floor and the hatch itself and rails have holes drilled and screws in place. I mentioned in an earlier post to drill holes in the ribs before assy' and i forgot to do it on both panels. No biggie.. just easier before they're iin place. I used a forstner bit to get a nice clean hole. My girls put the halloween costume (tinkerbell) on Lana, tha family furball and asked that I post her too ;)!

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

I started the wing joining process. I prefer to take it slow doing one joiner at a time. If nothing else it allows me to get a good fillet on that one joiner since the other is not in place and I have access inside. I also added a ply brace not in the instructions to the trailing edge area to help stiffen that connection. When thiis is dry i will add the dihedral brace to the other side of the main spars and balsa block to the trailing edge for the rear bolts. I'm going to leave the top sheeting off from the main spar forward for now so I have access to install / fit the dowel once the fuselage is completed.

I read the instructions for the fuse and it should go together real quick since it's all ply sheet sides, top and bottom with alignment tabs and lightening holes.

Pic1 is adding the rear brace. The balsa block at the rear is grooved and just for protection so I didn't crush the rear trailing edge with the clamp. Pic2 is adding the main dihedral brace to one side. Pic3 is joining the two wings, Pic4 is creating the fillet on the one dihedral brace. The fillet is shown not fully running the lenght but I fixed that as well as the gaps between the main spars.

This is the first wing I have built where the shear webs did not butt against each rib tightly and I thoiguht this strange but that's how it is on the plans.

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

I cut new ones that fit! http://i96.photobucket.com/albums/l175/Walther_01/2.jpg

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

I was thinking about it but oh well.. I went with the design... tThat looks like a nice covering job on the striping . On the strips.. do you cut those yourself or are they precut pieces?

The wings are bascially now joined. The maine dihedral braces are in place and I added some rear balsa block at the trailing edge for the bolts. I used some trailing edge stock I had and laminated a few pieces together to make the "fll" needed. I put a balsa strip lengthwise over the balsa sheeting where it butts together in the center. I will sheet the rear top this weekend.

I started on the fuselage with the formers. Some needed to be doubled up and some needed 1/8x1/2 balsa strips laminated. The ply clamps came with the kit. and I ran out of mine. You can never have to many clamps :(. There is one former left needing to be done. The balsa laminate looks like it's needed to widen the tabs in the formers to make a tight fit in the slots in the fuselage sides. I'm not sure why they just didn't make the slots smaller. I can't imagine the balsa adding that much strength as the formers will be in contact. glued with all 4 sides of the fuse.

I will be haeding to the Worlds Largest Outdoor Cocktail Party (oops - it was renamed !!... I mean the Fl / Ga game) tomorrow and will be back on Sunday when I hope to start putting the fuselage together. Instructions say to rubber band the whole thing together once the formers are ready and get it all alinged per the top and side views. Not sure I like that idea as it seems would be difficult to get a good bond between the former sides and fuselage without things shifting as you open it a bit to get some glue in there. I'm thinking of adding formers to one side first so we'll see.

Goooo Gators !!

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

I cut them all. This kit was given to me and I did not what to build another trainer so did it a little differently.

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

I finished the remaining former and pieced the fusealage together with all the pieces loose fit and rubber banded per the instructions. I was not wanting to remove the diecut dowel holes but having the wing hold down dowels in place helped aling the wing saddle doubler more precisely so I'll close them up later. Eerything fit nicely. I'm still deciding if I want to take this route of glueing while it's all together as the instructions state. Most construction is adding formers to one side then adding the other side to it. This has its challenges because while the front and rear formers under the leading and trailing edge are usualy 90 degress to the fuse, the farther aft you go, the farther from 90 degree the remaining formers (3) are (depending on which side of the former your going off of). This angle can be duplicated by looking at the top view of the plan so I'm going to sleep on it. [sm=confused.gif]. I just feel a better joint can be obtained by adding formers to one side, then adding the other side as things will be less likely to shift around and fillets can be better applied

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

This brings back fond memories! My first plane was an Eagle 2 (Actually an Eagle 63) and the construction photos look so familiar! My Dad actually build this plane for me, as everything I touched I screwed up hahaha. Our second plane was an actual Eagle 2, and I still have it (over 20 years old now!). I recently recovered it when Dad decided to start flying again :)

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

I went with glueing up the fuse with it all together using rubber bands to hold it in place and then used clamps. With the ass'y on the top view and lined up. I ran small dabs of glue on the front side of the former sides and fuse and let that dry (all but firewall). The aligment was then bascially locked in place. The pic now shows the fuse angled slightly toward the front of the bench with painters tape running along the bottom corner front to back with clamps every few inches to keep it tight. The fuse is angled sligly so the bottom corner is the low spot front to back. I put some expoxy along that joint and hit it wth the heat gun a few seconds which turns it into a thin type syrup. This allows the epoxy to seep fully into the joint and the wood while the tape keeps it in place. This part was my dilema as I wasn't comfortable with not having glue on the contct surfaces themselves but heating the expoxy solves that issue. I also do this with the heat gun when fuelproofing the tank area as it again seeps ito all the nooks and crannies and is easier to paint on the wood w/out using thinner.

When this is dry it will be safe to move more easily without affecting alignment and will I will then:

1) Do the other bottom side (angling fuse to other side)
2) Do the front of the formers (bottom and sides - fuse point up resting on tail very slightly forward and angled to one side, then the other)
3) Do the top of the fuse (fuse turned over and each side angled once one side is dry)
4) Do the top of the formers (fuse bottom is up and nose slightly up.
5) Do the backside of the formers. (nose pointing down)

By doing it in steps I can angle the body as needed so the expoxy stays put and does not run or drip where its not needed. This is just how I do it for sheet type fuselages and there are many diff ways. I'll post pics of each. Stringer type fuses are another can of worms.

Once the formers are done, I'll go about adding the bits and pieces like the wing saddle doublers, hatch supports,, etc. then onto the firewall and figuring out the side mount of the motor. ( I need to reset that clock!)

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

I would like to chime in a well here. I built the original Eagle in 1984. I was 14. I was so excited to get it for X-mas, and was so nervous about sucessfully building it. Even after getting it finished, I was just excited to watch it fly and exhilirated that the build was sucessful.
That was the thing back then, Goldberg kits were about the best thing going. They had new joinery techniques that made the planes build very straight and quick. Also step by step instructions that got you flying by completing each step. Very revolutionary for the time. Super glue was fairly new along with Monokote. All very new things for me (and my dad) at the time. we were used to dope and silkspan and typical wood glue and ambroid.
I am a sentimental sap about my RC experiences and maybe one day I will build another. This airplane taught me how to fly that summer, and I will always have a soft spot for it.

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

My softspot is for the M.E.N Trainer ;)

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

I've lost the plans for an Eagle 63 that I have framed up. I am trying to finish this plane and need the CG location. It should be on the main spar, but what is the range?

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

I'm out but will be back in the garage arond 9pm EST.. I'll take a look and let you know. Is the 63 the same as the Eagle II orherwise the CG location / range could be off.

Actually check here...looks like your question was answered.
http://www.rcuniverse.com/forum/m_92...tm.htm#9224598

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

Kit Builder, I went and checked through all my boxes from the move and found my plans. The CG location is on the center of the main spar with a 3/8" foward/aft range...

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

The fuse is coming along with the other bottom side done and and now fuse on its nose for the backside of the formers. Hoping to setup the front sides later tonight.

I started looking at the angles for the firewall both down and right angles. I don't think it will be diffiuclt to make a Wedge to put on the front of the firewall with the correct down and right thrust.

We have company coming this week and the Fl / Vandy game on Sat but I plan on hitting the garage when they ht the sack for some more fuselage glue-ups.

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

One last pic of the fuse for the last joint and its bascially done on the main part of the glue up. I figured the angles I would need to build into the firewall so I can rotate the motor, at this point approx 75 or 80 degrees.

I added thickness to the firewall with some pieces of ply and will transfer the angles needed onto the sides for down and right thrust. Using a belt sander it "should" be a "somewhat" easy operation to sand in the down and right thrust needed.

I will need to add a shim for the bracket to mount the steerable nose gear to bring that back to vertical as it mounts to the firewall. Plan pics show the right and down thrust built onto a mostly vertical firewall and the nose gear attached.

Lst pic shows my Craft-Air Firebird from the early 80's (think boxy Ultra Sport) under construction. Manufacturer and Kit are no longer available. You never know what the LHS has in the back room. Just ask. Looks Fast !! :D.

RE: Build thread for a Carl Goldberg Eagle II Trainer??
 

Nice build job on the Eagle, just found this thread the other night. after about 10 yrs off from RC flying, I finally got back into the game and found a prebuilt eagle 2 trainer that I had so many years ago. The wing on mine has absoute max dihedral, so it is as docile as the best trainer,,even with a OS 55 MAX. would like to build another wing with min dihedral and add the single servos.

Anyone know if Carl Goldberg sells just the wing kit for a eagle 2? I sent them several emails and tried to call,,but no answers back.