Jim Purcha Posted December 4, 2013 Author Share Posted December 4, 2013 Tack glued the torque rod blocks to the TE. I used rubber cement to attach another time, but this time it didn't hold the balsa in place. A drop of Lepage's Express glue and the blocks were in place for shaping to the wing. Need a good read for the build too. Jim Edited By Katy Purvis on 21/02/2017 13:36:55 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted December 8, 2013 Author Share Posted December 8, 2013 The torque rods are installed and the two wing panels are epoxied together using Lepage 5 minute speed epoxy. Because their was no wing joiner, I used a quicker setting epoxy. Now to fibreglass the center section. Jim Edited By Katy Purvis on 21/02/2017 13:38:39 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted December 15, 2013 Author Share Posted December 15, 2013 The wing has two layers of fibreglass epoxied in placed to strengthen the wing. Currently the wing is 1lb. 1 oz. in weight. Jim Edited By Jim Purcha on 15/12/2013 13:56:04 Edited By Katy Purvis on 21/02/2017 13:39:46 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted January 30, 2014 Author Share Posted January 30, 2014 Continuing with work on the stabilizer. Ribs in place, reinforce the ribs to the LE and TE, skin and than add the tips. Jim Edited By Pete B - Moderator on 22/02/2017 09:57:57 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted February 12, 2014 Author Share Posted February 12, 2014 I decided to try making a flat stab for the model. I just wasn't sure how strong the airfoil shaped one would be built up from balsa. It needs some additional reinforcing. The original article stated the author made the original plane with a foam wing and stab. I can see that working out better. The flat stab will still have the anhedral built in. Jim Edited By Pete B - Moderator on 22/02/2017 09:59:10 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted February 21, 2014 Author Share Posted February 21, 2014 Stabilizer tips are added to the horizontal stabs. The rubber cement didn't hold so, I tack glue with a couple small drops of white glue. The basswood strips were glued to the trailing edges of the elevators. When dry, the elevators were planed to shape and sanded. Jim Sanded to shape. Glued parts separated from the build. Edited By Pete B - Moderator on 22/02/2017 10:01:15 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted May 8, 2014 Author Share Posted May 8, 2014 Not to much happening on the build lately. Planning the fuselage. I'm using a larger spinner at 2-1/4" instead of 2". Because the original model had an engine with a shorter crankshaft, I had to lengthen the nose on my build. The longer nose looked bad with the canopy moved back, so I'm placing it where it is shown on the plans, just slightly forward over t he firewall. Jim Edited By Pete B - Moderator on 22/02/2017 10:04:01 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted February 17, 2015 Author Share Posted February 17, 2015 Well, it's been almost a year. It's time to get back on to this build. I bought some additional balsa, and have started to cut out the templates for the fuselage sides, fin, rudder and plywood reinforcement. Jim Edited By Katy Purvis on 21/02/2017 13:42:39 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted January 4, 2016 Author Share Posted January 4, 2016 Well, it doesn't look like much. But it is progress better than last year. Fuselage sides are 80% complete. I had to glue 4 pieces of balsa to make the sides as per plan. Each fuselage side is approximately 7" X 42" length. Still have to cut out the section for the airfoil profile and match side the sides together. I'm cutting one side complete than using it to outline the opposite side. i'll be making parts (bulkheads), most of the week. While I did construct a flat horz. stab., I may have a go again at the airfoil stab except, I'll try foam cutting it this time once my new charger comes in this week. A Turnigy Reaktor with a Foam cut option. My home made foam cut power source is blowing fuses for some reason and I needed a new charger anyways. Jim Edited By Pete B - Moderator on 22/02/2017 10:07:25 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted January 8, 2016 Author Share Posted January 8, 2016 After buying that dremel scrollsaw a few years back, I end up using a coping saw and a new blade. Jim Edited By Pete B - Moderator on 22/02/2017 10:08:37 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted January 28, 2016 Author Share Posted January 28, 2016 Plugging away at the fuselage. The triangular supports are in place. The main plywood formers are cut. Just have to cut the tail section for the horizontal stabilizer. I'm going to try to make it per plan again. The first tryout didn't work out, so I have a backup flat stab complete. The top 1/4 has been wetted and formed around the fuselage profile. The top triangular section were added. The 1/4" sheet top was wetted and formed and pinned to the fuselage sides. Checking the fit of the main formers, sanding to as necessary. Need to work on the firewall and stab before gluing the main formers into place. Jim Edited By Jim Purcha on 28/01/2016 04:43:19 Edited By Jim Purcha on 28/01/2016 04:55:25 Edited By Katy Purvis on 21/02/2017 13:44:49 Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted January 30, 2016 Share Posted January 30, 2016 Nice stuff Jim I still love a nice Hawk Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted February 9, 2016 Author Share Posted February 9, 2016 I going to make the stabilizer out of foam. My home made foam cutter was on the fritz and I needed a new charger. I had originaly purchased a Turnigy Reaktor 250Watt unit, a copy of the Icharger 106B+ unit that Mike Seale was using on his Blue Angel and Atlas builds. I found out the hard way the foam cut function did not operate. So after a refund and a sale. I found a Icharger 106B+ from a battery company in Mississauga, ON. It shipped Wednesday, processed through Canada Post Winnipeg Friday afternoon 5:17pm . It was delivered to my workplace on Monday at 9:00 AM. First tryout to cut foam. 12volts and 2.0 amps. The Icharger in foam cut mode functioned perfectly. Now for the stab. Jim Edited By Jim Purcha on 09/02/2016 05:07:42 Edited By Katy Purvis on 21/02/2017 13:45:45 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted February 14, 2016 Author Share Posted February 14, 2016 I hope to cut the horizontal stabilizer this weekend. The tip airfoil is really small. I modeled the stabilizer and tail section to get a better approximation of the section to be cut out of the tail. Jim Edited By Katy Purvis on 21/02/2017 13:47:26 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted February 14, 2016 Author Share Posted February 14, 2016 Here is why I modeled the sides of the fuselage. Templates glued in place. I can cut this out properly now. Edited By Pete B - Moderator on 22/02/2017 18:48:00 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted February 15, 2016 Author Share Posted February 15, 2016 Well I cut my first block of foam tonight. It wasn't too hard to cut the block the proper size for the stabilizer plan view. The airfoil shape was more interesting. Cutting a foam stabilizer for the first time. It seems to be going not too bad. Ok the first core wasn't too bad. The second one has to be redone. The wire caught on the nail holding the template in place. The foam I got from clean up of construction sights. There are some small voids in the foam. But I think it will do for the stabilizer. I would get better foam for a wing. My template material has to change too. I used basswood. It sanded easly, but it burns also if the wire is stopped for too long while cutting. I'll have to practice more to try some wings in the spring. Jim Edited By Pete B - Moderator on 22/02/2017 10:15:00 Quote Link to comment Share on other sites More sharing options...
Steve Houghton Posted February 15, 2016 Share Posted February 15, 2016 Jim, I've been following your build with interest as I have the same plan tucked away in my 'to do' pile. Having recently started cutting foam myself, for my PSS Zlin 526, I am interested in how you get on, and any details or pitfalls that you come across. My first attempts had many ripples in the surface, where I hadn't moved the cutter fast enough, but these were to be covered over in balsa so I didn't worry too much. Keep up the good work. Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted February 15, 2016 Author Share Posted February 15, 2016 Thanks Steve, I have a slight ripple on the first side I cut and some voids from the nails. It only got worse with the second side. The nail I used to tack the template in place was off center and snagged the wire while cutting. I'll be recutting this later today. It a holiday, so I have some extra time to build. Still encouraged to keep on practicing this method. I have other planes I would like to build with foam wings. Jim Edited By Pete B - Moderator on 22/02/2017 10:16:19 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted February 15, 2016 Author Share Posted February 15, 2016 The only pitfalls so far were the following: -The profile for the foam wing root and tip airfoils are the same thickness as the fully sheeted cross section shown for the balsa ribs. -The wing is built upside down and flat. It's in the article but not on the plans. -The exact cut out for the stabilizer is not shown on the drawing. Only the position of the horizontal stab at the center. -The 2" spinner is not available any longer. I changed it to 2-1/4" spinner. The nose area looks tight and small. The landing gear nose leg might have to go on the back side of the firewall. Unless you can find a engine mount which has holes for the leg predrilled. Jim Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted February 15, 2016 Author Share Posted February 15, 2016 I think these core are useable for a first attempt. A little rough, but both cores match. It was easier to cut the blocks to the plan view than the airfoil shape. I needed a wider bow with a deeper throat to make a better cut. Jim Edited By Pete B - Moderator on 22/02/2017 10:17:33 Quote Link to comment Share on other sites More sharing options...
Steve Houghton Posted February 16, 2016 Share Posted February 16, 2016 Jim, I sympathise with you regarding the template nails protruding through the cutting surface. I have now started viewing the foam blank from the front as I insert the pins holding the templates at either side, to try to ensure they won't foul the cutting bow. I'm often amazed at the inaccuracy of wing rib profiles on plans. On my Zlin 526 plan, there are three different views of the root and tip ribs, and they are all different lengths! A bit of lateral thinking is needed to identify the correct one, or to amalgamate several. Your tailplane cores are looking good. Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted February 17, 2016 Author Share Posted February 17, 2016 After making the skins I was to call it a night, but I just had to glue these in place. Success. Some trimming. Next time I'll cut back the skins a little more. Jim Edited By Katy Purvis on 21/02/2017 13:49:08 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted February 18, 2016 Author Share Posted February 18, 2016 These didn't come out to bad. 1.5 oz. (not complete). Now to finish it and get onto other parts. Vertical fin, rudder and finish the fueslage. Jim Edited By Pete B - Moderator on 22/02/2017 10:18:48 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted February 21, 2016 Author Share Posted February 21, 2016 LE and TE added to the stabilizer panels. Stab tips constructed of 1/16" plywood sandwiched between balsa and glued in place. Anhedral angle beveled in panels using dremel sanding disc. An use elevator fabricated a couple of years ago.Stab position cut out in fuselage tail sides. Jim Edited By Katy Purvis on 21/02/2017 13:50:50 Quote Link to comment Share on other sites More sharing options...
Jim Purcha Posted February 24, 2016 Author Share Posted February 24, 2016 Finally got the F3 and F5 Bulkheads installed. Usually this is an easy task, but these were different widths, so the fuselage tapers from the wing LE to the TE. At least an equal diagonal measurement gives some assurance the fuselage is straight. The 1 inch tristock had to be notched along the top for the fuselage sides to bend to the final dimension. Un restrained, the width is 3.75 inches and has to be pulled in to 3.25 inches. Jim How do you rotate a photo on this website. Edited By Pete B - Moderator on 22/02/2017 10:21:00 Quote Link to comment Share on other sites More sharing options...
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