Vans Aircraft RV-12 Build, Section 21: Mid Fuse Bibs & Bottom Skins (part 5)

Reference: page 21-06; 2.0 hours

This entry deals with more construction of the fuselage for the RV-12 aircraft. If you haven't noticed before, I would like to draw your attention to the index on the right side of this blog. In it you will find links to the different pages that have been completed, by page number, other general aircraft topics, as well as links to my RV-10 build.

Step 1: Dimple the nutplate attachment rivet holes in the two F-1267A Crotch Strap Brackets and machine countersink the nutplate attachment rivet holes in the two F-1267B Crotch Strap Brackets.



Step 2: Dimple the nutplates for the F-1267A Crotch Strap Brackets then using the rivets called out by Van's Aircraft in the plans rivet the nutplates to the F-1267A & B Crotch Strap Brackets.



Step 3: Dimple the four #30 holes in the sloped flange of the one remaining F-1215-R Seat Rib as indicated in Figure 2 on page 21-06.



Step 4: Rivet one each of the F-1267A&B Crotch Brackets to the Flaperon Mixer Bracket/Seat Rib Assembly and to the remaining F=1215-R Seat Rib.





Step 5: Dimple the four #30 holes in the sloped flange of the one remaining F-1215-L Seat Rib as indicated in Figure 2 on page 21-06.

Step 6: Rivet the remaining F-1267 A&B Crotch Strap Brackets to the Pulley Bracket/ SeatRib Assembly and to the remaining F-1215-L Seat Rib (from step 5) using the rivets called out in Figure 3.



CAUTION: When cutting lengths of AN257-P3 hinge, be sure enough remains to account for the length requirements of the parts given on pages 23-08, 26-02, and 29-02.

Builder's note: I didn't cut the hinge pin at this time. I don't know if this will make any difference, however on the RV-10 it was a life saver.

Step 7: Cut a 20 inch length of AN-257-P3 and remove the hinge pin. From these two hinge halves, make four F-1237E Seatback Hinges using the dimensions called out by Van's Aircraft in figure 4 on page 21-06 of the RV-12 plans.



Step 8: As shown in Figure 4, draw a line on the flush side of the F-1237E Seatback Hinges centered on the locating hole drilled in the previous step.





This completes all the steps on page 21-06. Until next time!

Vans Aircraft RV-12 Build, Section 21: Mid Fuse Bibs & Bottom Skins (part 4)

Reference: page 21-04, 21-05, 39-02; 11.0 hours

A couple of things before I get started. First I am planning on installing the autopilot option, so this is the time to start in on section 39 Autopilot Servo Brackets. Some of the steps from each of the two sections are intermixed. Second the parts need to install the servo brackets are included with the fuselage kit in a separate bag.

Step 1: Separate the F-1219 Flaperon Mixer Arm by removing the hatched area shown in Figure 1 on page 21-04 of the RV-12 plans.



Step 2: Rivet the two F-1218 Flaperon Mixer Brackets to the F-1202A Forward Intercostal and the F-1220B Aft Intercostal.


Step 3: Machine countersink the nutplate attach rivet holes in the Flaperon Mixer Arm, then attach the nutplates called out in Figure 2 of the RV-12 plans.

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Step 4: Bolt the F-1219A & B Flaperon Mixer Arms and the bushings called out in Figure 2 to the F-1218 Flaperon Mixer Brackets using the hardware shown by Van's Aircraft on page 21-04 of the RV-12 plans. Torque the bolt enough to remove any slop or play, but still allow freedom of rotation.

Builder's note: The bushings are in hardware bag 2715. Also it is not called out in the plan but I lubricated the bushings and washers parts with Areoshell #5 grease.



Step 5: Bolt the second, longer bushing called out in Figure 2 between the F-1291A & B Flaperon Mixer Arms.



Step 6:Separate the four Seat Belt Attach Lugs, and the two F-1216 Seat Belt Attach Lug Supports.





Step 7: Remove the vertical strip of material from the lightening hole of each F-1215-L&R Seat Rib as indicated in Figure 6 of ther RV-12 plans on page 21-04.



Step 8: Using F-1215-L&R Seat Ribs, Seat Belt Attach Lugs, and Seat Belt Attach Lug Supports, cleco together four Seat Rib Assemblies; two right and two left.



Step 9: final-Drill #30 the eight 1/8" dia. holes common to all the parts , then rivet them together.



Builder's note: This completes page 21-04.

Reference page 21-5

Step 1: Set aside two Seat Rib Assemblies (one left and one right). In the remaiining two Seat Rib Assemblies, final-drill #19 the screw holes for the nine nutplates depicted in Figure 1 on page 21-05 of the RV-12 plans. Note that in the case of the MS21051-L08 nutplate, the screw hole is NOT the center hole.



Step 2: Dimple the indicated attach hole for the MS21051-L08 nutplate in the aft, sloped flange of the two Seat Rib Assemblies. (The second attach hole has been factory dimpled.)



Step 3: Dimple the four K1000-08 nutplates called out in Figure 1, then rivet them to both Seat Rib Assemblies. The five remaining nutplates are installed on paers 21-07 and 21-08.



Step 4: In both Seat Rib Assemblies, dimple (flush on top) the three #30 holes.



Builder's note:some of the pictures show the parts before priming and then after priming. A few of these steps I did out of sequence so I could prime them all at once.

Step 5: Locate the four remaining Seat Ribs. In all four seat ribs, final drill #19 the screw holes for the nutplates depicted in Figure 2 of the plans.

Reference 39-02 Step 1: Trim the called out F-1215 Seat Rib by removing the material shown hatched in figure 1 on page 39-02.

Builder's note: It is easy to get the seat ribs mixed up so go slow double check before cutting!!!





Reference 21-05 Step 6: Set aside one pair of the Seat Ribs (one left and one right). Dimple the nutplates shown in Figure 2, then rivet them to the remaining two Seat Ribs.



Step 7: Dimple the nutplates shown in Figure 3 on page 21-05 of the RV-12 plans and the corresponding holes in the Left Seat Rib Assembly(the left seat rib assembly from Figure 1), then rivet the nutplates in place.





Builder's note; My Flaperon Stops were curved and needed to be straightened see picture below.



Step 8: Machine countersink the two holes, indicated in Figure 3, in both F-1252 Flaperon Stops.These are 120 degree counter sinks NOT the standard 100 degree!



Step 9: Rivet one of the F-1252 Flaperon Stops and the Pulley Bracket Assembly to the left Seat Rib Assembly using the rivets called out in Figure 3.



Step 10: Rivet the F-1215-L Seat Rib that has the nutplates installed from step 5 to the Pulley Bracket Assembly as shown in Figure 3.



Step 11: Dimple the nutplates shown in Figure 4 and the corresponding holes in the Right Seat Rib Assembly (the right seat assembly from Figure 1 on page 21-05.



Step 12: Rivet the remaining F-1252 Flaperon Stop and the Flaperon Mixer Arm Assembly to the Right Seat Rib Assembly.

Reference 39-02; Step 3: (Step 2 is NA) Cleco the F-1269 Servo Doubler to the F-1215-R Seat Rib as shown in Figure 2. Match-Drill the holes from the servo doubler into the seat rib per the call-out in Figure 2, Detail A-A.



Reference 39-02; Step 4: Rivet the Servo Doubler to the F-1215 Seat Rib per the call-out in Figure 2. Detail A-A.



Reference 39-02; Step 5: Rivet the F-1269 Servo Doubler to the F-1220B Aft Intercostal. See Figure 1 for assembly orientation and Figure 2 for rivet call-out.







Reference 39-02; Step 6: Install the screw, washer and nut called out in Figure 2. Rotate, then rivet the nutplate back into place using the rivet called out in Figure 2.



This completes page 39-02.

Reference 21-05 Step 13: Rivet the F-1215-R Seat Rib that has the nut plates installed from Step 5 to the Flaperon Mixer Arm Assembly.

Vans Aircraft RV-12 Build, Section 21: Mid Fuse Bibs & Bottom Skins (part 3)

Reference: page 21-02; 3.0 hours

This is the next installment of my ongoing step by step build of an E-LSA (experimental light sport aircraft) made by Van's Aircraft. Better known as the RV-12. Up to this point the tail kit is completed as are the wings. This section is dealing with the building of the fuselage. I've been using old school priming techniques, alodine and zinc chromate primer. This has worked well as there are many parts that are prepped and then riveted into place invery small batches. This is in stark contrast to the RV-10 that had large number of parts to prime all at once.

Step 1: Rivet the F-1206A bulkhead to the Baggage Ribs using the rivets called out in Figure one of the RV-12 plans page21-03.





Step 2: Rivet the F-1206G-L&R Baggage Ribs to the F-1206A Bulkhead and the F-1221-L&R Baggage ribs using the rivets called out in Vans Aircraft's plans.



Step 3: Dimple the holes in the top flange of the F-1206H _L&R Baggage Ribs that correspond to the dimpled holes in the F-1224-L & -R Baggage Floors.



Step 4: Rivet the F-1206H-L&R Baggage Ribs to the 1206A Bulkhead using the rivets called out in Figure 1 on page 21-03 of the RV-12 plans.



Step 5: Rivet the F-1224L&R Baggage Floors to the F-1206A Baggage Bulkhead and F-1206H-L&R Baggage Ribs using the rivets called out in Figure 2 of the RV-12 plans.



Step 6: Dimple the ten nutplates called out in Figure 2, then rivet them to the F-1206A Baggage Bulkhead, f-1206H-L&R Baggage Ribs, and F-1224-L&R Baggage Floors.





Step 7: Rivet the F-1206F Bearing Brackets to the F-1206A bulkhead using the rivets called out in the plans.



Step 8: Rivet the F-1206F Bearing Bracket Brace to the 1206G-L&R Baggage Ribs and Bearing Bracket assemblies using the rivets called out in Figure 3 of the RV-12 plans. The flush, manufactured heads of the rivets in the Bearing Brackets Assemblies are placed against the web of the baggage ribs.





Step 9: Separate the F-1250 Pulley Brackets by removing the hatched areas shown in Figure 4 of the RV-12 plans on page 21-03.



Step 10: Rivet the F1250-L&R Pulley Brackets to the F-1220A Forward Intercostal and F-1220B Aft Intercostal using the rivets called out in Figure 5.



This completes page 21-3 of the RV-12 aircraft plans.