• If you are new to GiantScaleNews.com, please register, introduce yourself, and make yourself at home.

    We're 1st in Giant Scale RC because we've got the best membership on the internet! Take a look around and don't forget to register to get all of the benefits of GSN membership!

    Welcome!

Scale RCM 1/3 Scale Champ Build

TonyHallo

150cc
It has been a while since the last update, 8 days at the beach, 2 days at Joe Nall, 3 days cutting grass, 1 "honey do" project, 1 day helping out my brother at the auto repair, not much time for the Champ.
I'm using CB Associates hinges for the Champ, the leaves are 1/16" thick. On the horizontal stabilizer the hinge slots were cut in the spline before the spruce was glued on so it was just a matter of shimming the slots with 1/64" plywood scraps, the rudder was done in the same manner. I needed to cut two 1/16" slots in the vertical stabilizer post. To do so a Robart 1/8" drill bushing was shimmed with K&S tubing to make a 1/16" drill bushing. A series of 1/16" holes were drilled in the spruce tail post using the Robart drill fixture, then the holes were cut and filed to make the two slots.
The horizontal stabilizer rear mount is made from 1/16" aluminum sheet and a piece of 1/2" aluminum tube. The parts were jointed together with Harris Al- Braze 1070. The filler wire melts about 50 degrees below the melting temperature of the base metal so sometimes the hole mess just melts, I got lucky today on the first try, did melt the edge of one of the sheets but not an issue.. The mount is inset into the rudder post and attached with #4 flat head screws. The front mount will set the incidence and square the surface. I plan to make and install the flying wires before the front mount is glued in, this will insure everything is in the right spot. The triangle opening behind the trailing edge houses the elevator horn and gets covered in with a .013" aluminum sheet.

IMG_2482.JPG
IMG_2484.JPG
 

TonyHallo

150cc
Say Ace, looked for you at Nall but I assume you arrived after I left on Monday morning, hope you had fun, I hope to make it back with a plane or two in the future.
 

TonyHallo

150cc
Starting to think about resuming work on the Champ. I have been building a shed for the past few months and it is almost complete, once it is done have another project lined up that should take me into 2020. I have decided to use Steward System EkoBond cement for the fabric, ordered two quarts from Aircraft Spruce since it can not be shipped during the winter months. Can't wait to get back on the Champ. At this point I plan to finish the model with latex paint.


09-41195.jpg
 

Snoopy1

640cc Uber Pimp
Starting to think about resuming work on the Champ. I have been building a shed for the past few months and it is almost complete, once it is done have another project lined up that should take me into 2020. I have decided to use Steward System EkoBond cement for the fabric, ordered two quarts from Aircraft Spruce since it can not be shipped during the winter months. Can't wait to get back on the Champ. At this point I plan to finish the model with latex paint.


View attachment 112023
Can you explain a little about the product and why you have decided to use this product.
 

TonyHallo

150cc
Steward Systems is a water based system for finishing full scale aircraft so there are no fumes. Ekobond is used to attach the fabric to the structure and apply the finish tapes. There are other Steward Systems products for finishing the fabric however I plan to use latex paint. The Poly Fiber (Stits) products I have used in the past are solvent based and use MEK. With my old furnace the air changed frequently in the workshop so the fumes went away, not so with the new 96% furnace.
Here is a link that talks about latex on home built aircraft http://wienerdogaero.com/LatexWhy.php.
 

Snoopy1

640cc Uber Pimp
Steward Systems is a water based system for finishing full scale aircraft so there are no fumes. Ekobond is used to attach the fabric to the structure and apply the finish tapes. There are other Steward Systems products for finishing the fabric however I plan to use latex paint. The Poly Fiber (Stits) products I have used in the past are solvent based and use MEK. With my old furnace the air changed frequently in the workshop so the fumes went away, not so with the new 96% furnace.
Here is a link that talks about latex on home built aircraft http://wienerdogaero.com/LatexWhy.php.

Thanks I am right now using all of Stits products but as you have noted MEK is used and that stuff is not good for you. So if I can replace the the Stits fabric glue that glues the fabric to the wood with the EKO BOND and it works and cleans up with water I am very interested. Please keep me informed. Thanks again.
 

TonyHallo

150cc
You can find all their videos on YouTube. I friend just redid his wings with Steward Systems, unfortunately he experienced engine out at 600' following takeoff, totaled the plane, broke his back. He's all better and bought a new to him plane, Cessna 170
 

TonyHallo

150cc
I decided to delay the home project until next spring so I put the Champ back on the bench, determined that the rear mount for the stabilizer was not going the work so went ahead and made new parts for a rear mount and began installing the front stabilizer mount. Once the epoxy cures the aluminum tube will get glued in place. The plans show the stabilizer set at negative 3/4 degree of incidence while the wing is set at plus 1 degree. The 3 view of the full scale show the stabilizer set at negative 3 1/2 degrees and the wing at plus 1 degree. Looked at the incidence on the Balsa USA super Cub at it is set a negative 1.6 degrees. Think I'm going to set it at negative 2 degrees. Any thoughts out there?
IMG_2679.JPG

IMG_2680.JPG
 

TonyHallo

150cc
I laid out a center line on the bench then constructed a perpendicular line with a large compass. With the fuselage on the center line the stabilizer was blocked level in position on the perpendicular line. In this position the front stab mount was glued in with a mixture of epoxy and chopped fibers. Tomorrow I can install rear mount and begin making the tail wires.
IMG_2682.JPG


I had previously modified these DuBro 4-40 rod ends but find the dam things!
IMG_2474.JPG
 
Top