1:3 Bohatyrew 'Motyl' of 1925

[ARUP]

Csec modelarze! Here is the other cable run. The wire TE was put in place. The aluminum tube to capture the wire was too long at the aileron end of the wing so it was re-slotted and trimmed. The wire was bent to let it anchor into the rib then the aluminum tube 'ears' were peened over the wire. Epoxy secures it. The wire stock is too short so the other end was secured in like manner. The aluminum tube's hole had to be 'stretched' to fit a second wire whose ends were secured, likewise. The wing root rib's TE got 1/64" ply pieces at its TE top and bottom surface to help hold the wire in place. When the covering goes on the wire TE will pull into a gentle scalloped shape.









more...

[ARUP]

Toznowu ja! The aileron horns were painted then guides were fabricated for placement of the horns onto the aileron ribs. Dummy cables (fishing lines) were used to place and epoxy aluminum ferrules onto the ribs. A spacer block was put between the pulleys to keep them in place while setting up cable runs. The cables and respective guide tubes will keep the pulleys in place after everything is connected and in working order. The next order of business is drilling holes in ribs for cables to pass. The length of the bell crank hole to pulley was measured and drawn on the board. The height of the bell crank was measured and this put on one side of the drawing then the height of the pulley guide tube put on the other end. Rib stations were drawn onto this between the ends. A line was drawn connecting the two. A dummy cable was put across the wing. Then a triangle was used to know were to transfer the rib hole heights, as measured from the drawing, onto the ribs for drilling. It takes longer to type this than it does to do it! The ailerons have their hinges epoxied in place. I am holding one of the removable hinge pins.





Spotkamy sie znowu!

[ARUP]

Witam ponownie! A 1/32" marine ply shear web was glued to the spars where the pulleys will get mounted. The ribs at the same location were reinforced with 1/64" ply. Triangles of 1/16" marine ply were cut and drilled to receive aluminum tube axles for the 1.25" pulleys. Aluminum cable guide tubes were mounted on 1/16" balsa stand-offs using epoxy. The exit guides will get built next. The aileron wire horns have been fitted with brass tubes, their ends flattened and drilled to accept detachable cables. The ailerons are getting hinged. Once that is done aileron 'throws' and clearances can be arranged. As in some of my other models, the ailerons will be removable.





Dobry wieczor!

[ARUP]

Thanks, Gunny and Gene!

[ARUP]

Hello Peter! It's so good to hear from you and I hope you and your family are well! Did you ever finish that neat Avia?

[stihac]

Loving it! Your builds are the best. Those of us relegated to be "virtual builders / flyers" enjoy your posts. Thank you for doing it.

[Gene C]

I'll second that. Looking great.

[gunny11]

Coming along nicely.. Keep it up.

[ARUP]

Witam ponownie! Work progresses on the 'secret project' and the Motyl! The left wing's aileron LEs were let into the ribs and the LE of both wings sanded to rough shape. Once the cap strips are installed the LE will fair into them. One aileron was cut free and the hinge line drawn onto it so the center of the horn could be located. You can see the wash out built into the aileron. The wing has no dihedral so it will be nice to have wash out. The bell crank has a span of 80mm hole-to-hole so the horns will be the same. The start of the aileron horn fabrication has started. They are wires bent and soldered and will have brass tubes epoxied onto them. The brass tubes will be flattened and drilled to accept the pull-pull cables on their end.





PA pa!

[ARUP]

Csec modelarze! The top parts of the aileron spars were added. Scrap was used to maintain even spacing from the wing to aileron. Cap strips for the aileron were added so the tip could get sanded fair. Once the other wing is done then all cap strips, drag and anti-drag bracing and aileron pull-pull cables get installed before the final LE sanding. It's near the home stretch with major construction almost done!







Kolejny dzien!

[ARUP]

...more! While letting glue dry the aileron bell cranks were started. Rough blanks were cut from phenolic then measured for drilling cable attach holes, pivot hole and clevis horn hole. The cable hole spacing is 80mm as will be the aileron surfaces' horn spacings. Then they were dressed on the belt sander and mounting blocks were made and epoxied in position. A segment of brass tubing is the pivot and is a very slight interference fit on the bell crank. The tube pivot is glued into the mount blocks. Not shown is a stick of hard balsa glued to the rib from main spar to TE where the aileron's horn will be located. This will keep the wing from compressing locally under the action of aileron input and its flight loads. I don't have enough pulleys so McMaster Carr to the rescue... I hope! I'll make an order tonight!







Do widzenia!

[ARUP]

Dzien dobry! I did a little planing therapy. I love my new planes! They beat the tar out of sandpaper and my arms and shoulders aren't so tired. Each wing panel was flipped over in turn so the aileron spars could get started. A straight edge was secured then the lower part of the aileron spar's slots were cut. The lower part of the spars were glued in place then the wing was flipped upright. This made the ribs a little more robust so that the aileron portion of the ribs could get leveled. I had to block the wing stable so the plane and 'T' sander could do their 'thang'! The straight edge across the top plus some pencil marks helped guide the razor plane and 'T' sanderWhen that was done 1/64" rib doublers were glued in place. Now the upper aileron spar parts can get 'cut-in'.









more...

[ARUP]

Gotowy na wiecej? The main ribs were put on the spars and glued after alignment ensured. When the glue dried the outermost rib was put in place using a jig then glued. The other two ribs were then fitted after measuring and cutting the ribs for the spars to pass. Fiddly but easy. The fore curved LE was fitted and glued. A spar extension piece had to be custom made to anchor the curved LE. From there the swept portion of the tip was added. It will get joined to the TE. While glue was drying the stabilizing strut anchors for the wings were made. Sheet steel was cut, drilled, filed, sanded, cleaned and painted. The parts were mounted to their blocks which will get glued into the wings. The nice thing about these stabilizing struts is they will also serve to keep the wings from sliding off the wing tube! My feet hurt... since I've worked on this model almost all day!









Dobranoc!

[ARUP]

To znowa ja! the root ribs were finished along with the fuselage to receive them and the wing construction has started...yippeee!





Do nostepnego razu!

[Gene C]

Ah! good old masking tape. The one item a shop can't be without. Interesting servo setup.