Robert Parker Posted June 10, 2020 Share Posted June 10, 2020 Hi All, Well, I thought I would dust off my drawing equipment once again whilst I'm waiting for some decals to arrive from across the pond. I came across Pete Crosby's earlier post, a very big build and it got me thinking and doing a bit of digging around the web. First built in 1918, it was the first all-metal transport plane and carried 2 crew and 4 passengers, the crew sat in a semi-enclosed cockpit whilst the passengers were in the cabin. The prototype had a wingspan of 14m later aircraft the wingspan grew to 17.050m. So a 1/10th model comes out at 1700 mm (67" wingspan and a length of 970 mm (38" Materials: Balsa & ply Power: It is calling for IC and a four-stroke at that I have an RCV 58 sitting in a box looking for a bit of action. My initial thoughts were electric but being as I have a spare engine or to lets put one to use, eventually Not my own work, but an idea where I want to get to Working from a plastic model and three view drawings After a total of 8 hours and a partial redraw, I ended up with this. I made a simple error, I worked from different references which gave me conflicting information due to variations of the aircraft being built between 1918 and 1932. As can be seen, I have drawn two stabilisers, having drawn the wide narrow one yesterday I found that the narrower but wide one being used more so I'm going for that option as well as the narrower one will be less prone to damage. I have made a start on the wings this afternoon but wasted too much time looking at aerofoils. The full size had a really deep section. For it to be to scale, which it does not have to be for me, it works out at 65 mm deep with a chord of 320 mm That's all for now regards Robert Quote Link to comment Share on other sites More sharing options...
J D 8 Posted June 10, 2020 Share Posted June 10, 2020 There is a full size flying replica of this interesting aircraft. It is though powered by a Pratt Whitney Wasp for operational needs and is fitted with a tail wheel. Based in Switzerland I think. Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted June 12, 2020 Author Share Posted June 12, 2020 Hi All, I have completed the basic wing drawing, quite straight forward really. I'm putting a 6mm washout in the wing along with the 5 degrees of dihedral. A little undecided about the sheeting whether to go partial sheeting and cap strips as per left-wing or fully sheeted just thinking about weight issues. The ribs in the center section will be 3mm liteply and the outer panels 2.5mm balsa. Main spars in the center section are to be 9 x 6 hardwood and hard balsa in the outer panels and the rear spars to be 6 x 3 hard balsa I give a little thought to the undercarriage and basically going for a practical solution that is not far from scale. I can confirm power will be from my RCV CD58 which fits very nicely in the engine bay and I can even use the exhaust in the scale position, like a chimney! I can now draw the firewall bulkhead now I have finalised the power source and draw in the tank position as well. I'm guesstimating the AUW to be around the region of 8 lbs or so Next, Ribs That's all for now Regards Robert Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted June 17, 2020 Author Share Posted June 17, 2020 Hi All, I have drawn the tip and root ribs and made templates for them and form the rest of the ribs using the sandwich method. I have also done a provisional CoG calc using an online CoG calculator based on estimated weights of 8lbs and then 10lbs for a starting point. Wing area 696 sq in The 8lb model has a wing loading 26oz/sq in and a stall speed of 25mph whilst the 10lb model came with a wing loading of 36oz/sq in and a stall speed of 28mph That's not a bad starting point, however, could any of you out there advise me on what static margin would be acceptable for this type of model. With the 8lb model, I went with 10% with the static margin which gave a CoG of just over 3". That's all for now Regards Robert Edited By Robert Parker on 17/06/2020 20:44:39 Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted July 14, 2020 Author Share Posted July 14, 2020 Hi All, Life has got in the way a little bit with the Junkers, I started the drawings when I was put on furlough. However, my wife didn't fancy the idea of me being at home and being paid so she suggested that we (I) rip out the bathroom as this would be a good opportunity being as we could not go abroad on holidays. Well, this has turned out to be a much bigger/more complicated project with walls being hacked off and re-rendered then tiled and then fit the new suite which when unpacking the wc was broken and the supplier is not responding to emails let alone phone calls. In this last month, I have bearly done any building to finish off my present build to clear the way for the Junkers. Still, by doing the bathroom I should earn some brownie points to go flying. That's all for now Regards Robert Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted August 15, 2020 Author Share Posted August 15, 2020 Hi All, I have just ordered all of the balsa, ply, and accessories to make the model, and now that I will have cleared my workbench of what I thought was going to be a quick little project which took a little longer than I thought. So hopefully by the end of next week, the build will commence at last. That's all for now Regards Robert Quote Link to comment Share on other sites More sharing options...
J D 8 Posted August 15, 2020 Share Posted August 15, 2020 Interesting project, post some more pics when you have some structure built. How are you going to do the corrugated surface? Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted August 15, 2020 Author Share Posted August 15, 2020 Hi JD, I'm not going to even try to replicate the corrugated sheeting. I did think about it but all of the bends/leading edges the corrugate sheet would crumple. Regards Robert Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted August 22, 2020 Author Share Posted August 22, 2020 Hi All, The Junkers has now entered the construction stage All timber has been weighed and allocated its parts. Tail feathers built and fuselage started. There does not seem to be a great deal of wood, but there again most of the construction is open framed. And were off fin, rudder, tailplane, and elevators all made The first part of the fuselage. This is taking no time at all at this rate. That's all for now Next, I will be making the second rear section and cutting out the formers Regards Robert Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted August 27, 2020 Author Share Posted August 27, 2020 Hi All, The fuselage is coming along nicely with no major issues. I do need to add engine cooling via the front have positioned the engine in the fuselage I'm going to have to open up the front where I had intended to have a dummy radiator, have to cool the engine details can follow. Left and right side dry fitting Gluing up as a pair The full-size aircraft had a very boxy fuselage with a curved roof which has made it easy to make. That said the cockpit area will require some thought, more on that later. The fuselage really pulls in at the nose. the front former has not been glued in yet. The RCV 58 looks quite small compared to the spacious fuselage at just under 6 inches wide at the widest point, plenty of room for the servos. Next, is to make the formers for the top of the mid to rear fuselage and sheeting/planking. That's all for now Regards Robert Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted September 3, 2020 Author Share Posted September 3, 2020 Hi All, After posting my last post I looked again and decided not to close in the fuselage at this stage as I would be making things difficult for my self for sorting out the wing mounting. So I have made a start on the wings. Cutting out the ribs took a little longer than I had hoped but all done and now that I am happy with them I have drawn them on the plans Starting on the centre section because I wanted to match up the wings and the fuselage and having a small centre section will make it easier to fine tune the fit between them The central four ribs are 3mm lite ply whilst the outer two are 2.5mm balsa Once the centre section was made it was time to start the outer panels I have tapered some balsa sheet to give me 5mm to 0mm of washout Underside of centre section Top side sheeting started. That is as far as I have gone this week. Next I'll continue with the wings. That's all for now Regards Robert Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted September 6, 2020 Author Share Posted September 6, 2020 Hi All, I have completed the center section and fettled the wing seat to the wing, I thought it would be easier with a small wing rather than the completed wing less chance of damaging it. After some consideration, I opted to band the wings on I have also started the other wing panel. A nice fit between the wings and the fuselage Second wing panel glued up again building in the washout. I have ordered the covering, looks like I'm going to need it soon. Next, is to finish off the second panel and get it off the building board then it's time to make a start on the main undercarriage, metalwork is not my strong point. That's all for now Regards Robert Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted September 13, 2020 Author Share Posted September 13, 2020 Hi All, Wing panels completed, however, progress on the u/c has come to a standstill due to working longer hours and need to fully get a grip on how it is going to go together. That's all for now Regards Robert Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted September 20, 2020 Author Share Posted September 20, 2020 Hi All, Main u/c made and fitted looks the part especially with a pair of Flair wheels which I had for a Fokker DVII but were perfect for the Junkers. Box artwork The kit which was a help to work out the geometry of the parts The end product still in need of some fine adjustment and the scale detailing but not bad. The basic construction is the same as the Flair Scout kits The wheels are a little on the large side but close enough. Next, it's back to the wings and join them together That's all for now Regards Robert Edited By Robert Parker on 20/09/2020 12:42:24 Edited By Robert Parker on 20/09/2020 12:42:38 Quote Link to comment Share on other sites More sharing options...
J D 8 Posted September 20, 2020 Share Posted September 20, 2020 Nothing wrong with band on wings at this size, can save a lot in a whoopsy and quick to assemble.. Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted October 3, 2020 Author Share Posted October 3, 2020 Hi All, I have progressed fairly well since my last post. Wings joined, tail group fitted and hinges fitted, and fuselage roof made and the cockpit formed. The clamps are holding the aileron servo hatches Not as much room as I thought but enough to get the flight crew in. The floor is sitting on the tank With all of the major parts made I could not resist putting it all together Still to attend to the nose I am a little concerned about the size of the fin. rudder and stabiliser given how big the fuselage is in comparison and how much will it shield the prop wash. Looking good. The main reason I assembled her is that I was getting quite concerned over the weight, no not mine too late for that, but the aircraft seemed very heavy with the engine in place. Well no worries here then, all servos fitted, flight battery still to fit but it should go just in front of the u/c. CoG set at 1/4 cord. I have also weighed the airframe plus making an allowance of 1 5m roll of film and it came out at 6 1/2lbs, that's a whopping 1 1/2 pounds below my questimated weight. The servos are tucked in behind the last former as a starting point but this will be their final position Hinges fitted and pinned ready to cover. And before anyone questions the position of the exhaust on the model, it is almost in same position as the full size. Next is to finish off the nose and prepare the model for finishing That's all for now Regards Robert Edited By Robert Parker on 03/10/2020 17:59:50 Quote Link to comment Share on other sites More sharing options...
Eric Robson Posted October 3, 2020 Share Posted October 3, 2020 I like it a lot, back in the 1980'sPeter Neate I think I have the name right built a Ju52, he made rollers and formed litho plate panels for the whole model . He said the worst part was that the full size had different widths of corrugation which he copied , the wings being the hardest to cover. I don't blame you for not going down that road it looks great as it is now. Looking forward to seeing it finished. Eric r. Quote Link to comment Share on other sites More sharing options...
Timo Starkloff Posted October 4, 2020 Share Posted October 4, 2020 That's going to be a nice one Airliners are rare on model airfields, no matter what age. Looking forward to the finished model! There once was a small German company called "Titanic Airlines" and they sold foam imitation for the Ju 52 surface. Light and with a good scale appearance, but only suitable for electric models. Timo Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted October 4, 2020 Author Share Posted October 4, 2020 Thank you, Timo, yes there are few airliners to be seen this will be my second and hopefully more successful than my last which did not get past the maiden. My FW200 condor, massive CoG issue. Regards Robert Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted October 22, 2020 Author Share Posted October 22, 2020 Hi All, Well we're on the home run with this one. Covering completed all servos installed and some detailing added. So here are a few photos before the final photoshoot just to whet your appetites I added the mock suspension units and painted the u/c and wheels The twins are settling into their new office Windows and doors added and painted on. Just a couple more weeks for the decals to arrive from Callie graphics and then I'll let you see the finished model. That's all for now Regards Robert Quote Link to comment Share on other sites More sharing options...
McG 6969 Posted October 22, 2020 Share Posted October 22, 2020 Getting close to the end now, Robert. ... isn't your flight crew looking a bit Rising Sun-ish for a JU model? ... Cheers & stay careful, young man Chris Quote Link to comment Share on other sites More sharing options...
Eric Robson Posted October 23, 2020 Share Posted October 23, 2020 Hi Chris, some were actually sold to Japan. Finding a livery to match the crew may be difficult. Great project Robert looking good. Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted October 24, 2020 Author Share Posted October 24, 2020 Thank you both, I agree that they don't quite look authentic Junker's staff, but to be honest there is not a lot of choices out there other than paying some serious cash for bespoke pilots. Still when in the air they will only be just visible. A DH 71 Tiger Moth racer is next on the building board if anyone is interested, an old JB Aviation kit. Regards Robert Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted November 7, 2020 Author Share Posted November 7, 2020 Hi All, Well after waiting for what felt like an eternity the decals arrived from Callie graphics across the pond this morning and with rain forecast for tomorrow, I quickly applied them and had a photo shoot as the sky had overcast and the light fading. Really pleased with results, I hope she flies as well as she looks. Covered in Hobbyking silver and black A few jobs to do before flying though, these are fuel proof all over as the decals are not fuel proof, make and fit the wind shields, throttle push rod to fit, final weight and CoG check and double check, and finally get some flying time in as I have only flown once this and I'm well rusty by now. That's all for now Regards Robert Edited By Robert Parker on 07/11/2020 15:59:35 Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted November 22, 2020 Author Share Posted November 22, 2020 Hi All, With today's fine weather I have managed to give the airframe two coats of fuel proofer, (in between doing work on the house), and previously I have fitted the throttle push rod and switch. So when the odour of the fuel proofing has worn off I'll bring the model in from the shed and do the last few bits and pieces that are still left to be done and then we will be ready to fly, which will not be this side of Christmas unfortunately. That's all for now Regards Robert Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.