Bernd Lewerenz Posted July 25, 2023 Share Posted July 25, 2023 Hi together I "m Bernd from Germany and I am currently building a Messerschmitt M23C by Jim Newberry. I have a milling parts kit from Sarik and have started building the fin.The parts fit great and the tail was built quickly 3 Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted July 25, 2023 Share Posted July 25, 2023 Nice choice Bernd, had to google it. 👍 Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted July 26, 2023 Author Share Posted July 26, 2023 Yes, I think so too.I like aircrafts fro the golden aera.Next step was building the elevator..The tailplane consists of a frame made of balsa strips, which is planked on both sides with 1.5mm balsa.The rudder is conical.The longitudinal ribs are tapered in the kit, but the diagonal ribs are balsa stripes.So I glued sandpaper to a flat board and shaped the elevator in form.This way you can avoid dents. 105 / 5.000 Übersetzungsergebnisse Übersetzun 105 / 5.000 Übersetzungsergebnisse Übersetzung so I glued sandpaper to a flat board and sanded the elevator evenly 1 Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted July 26, 2023 Author Share Posted July 26, 2023 I"m not sure, if I handle correct in the forum. Maybe someone an explain,how to do that Thank you Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted July 27, 2023 Author Share Posted July 27, 2023 The fuselage The fuselage consists of a robust front part made of plywood, followed by a rear framework of balsa strips.The assembly begins with the gluing of two 3mm plywood parts to a 6mm laminate, which is used for the front part of the fuselage.Make sure that only one part of the fuselage has cut-outs for the the fuselage formers and the wing fasteners.Therefore, these parts must be placed on the inside of the fuselage. Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted July 27, 2023 Author Share Posted July 27, 2023 The second fuselage side panel was built up exactly over the first one with a protective film in between.With this you have congruenc.the side parts were build together with the formers as always with my fuselage jig, wich I recomment to use.If not, perhaps you build a Banana 1 Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted July 27, 2023 Author Share Posted July 27, 2023 After laying the bowden cable tubes for the rudder linkage, the rear fuselage back could already be planked with 3mm balsa strips.The strips must be cut to a conical shape 2 Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted July 28, 2023 Author Share Posted July 28, 2023 The cockpit hatch framework.4Magnets will later hold it to the fuselage Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted July 30, 2023 Author Share Posted July 30, 2023 The Ply Box for Motor mounting 1 Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted August 1, 2023 Author Share Posted August 1, 2023 Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted August 3, 2023 Author Share Posted August 3, 2023 The motor box, glued with epoxy and reinforced with triangular strips 4 Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted August 8, 2023 Author Share Posted August 8, 2023 The fuselage weighs 745g without landing gear. And that is too much.9 holes on each side with 30mm diameter reduce the weight by 60g. Nevertheless, the hull is still stable. 3 Quote Link to comment Share on other sites More sharing options...
kc Posted August 8, 2023 Share Posted August 8, 2023 Your model seems to be coming on well but the construction seems very substantial. The original model seems a bit beefy! 8lbs / 3629g for 73.5 inch / 1.85 metre span ( or is it 78 inch / 1.99 metre? the data sheets vary from March to April issue! ) It's the ply construction that would appear to be the reason. Compare that with the 4lb 13 oz / 2200g weight of a 78 inch / 2 metre span Miles Magister built by one of my clubmates - almost half the weight! That Magister uses a very small Lipo so it's much cheaper to equip. It's just the build philosophy - minimise the weight of everything compared to making everything strong, interlocking and from sheets of ply. People are realising that the strong construction used for decades on i.c. powered models is not necessary for electric models. However I expect your model will fly well as did the designer's original. Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted August 9, 2023 Author Share Posted August 9, 2023 Yes, I agree on all points.For me it is a challenge to build the model as light as possible without loss of stability.Unfortunately, I had ordered the complete kit from Sarik.So I replace all the heavy components where possible.Thanks for your comment. I already thought that no one was interested in my construction report. Quote Link to comment Share on other sites More sharing options...
Flying Squirrel Posted August 9, 2023 Share Posted August 9, 2023 49 minutes ago, Bernd Lewerenz said: I already thought that no one was interested in my construction report. There's plenty of us enjoying all of the build threads but choose not to comment to keep the thread clean, unless there is something constructive to add of course 🙂so please don't be put off posting updates. 5 Quote Link to comment Share on other sites More sharing options...
Mike T Posted August 9, 2023 Share Posted August 9, 2023 Absolutely! Mach weiter so! Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted August 9, 2023 Author Share Posted August 9, 2023 Gerne, of course 3 hours ago, Mike T said: Absolutely! Mach weiter so! Quote Link to comment Share on other sites More sharing options...
MattyB Posted August 9, 2023 Share Posted August 9, 2023 (edited) On 08/08/2023 at 18:32, kc said: Your model seems to be coming on well but the construction seems very substantial. The original model seems a bit beefy! 8lbs / 3629g for 73.5 inch / 1.85 metre span ( or is it 78 inch / 1.99 metre? the data sheets vary from March to April issue! ) It's the ply construction that would appear to be the reason. Compare that with the 4lb 13 oz / 2200g weight of a 78 inch / 2 metre span Miles Magister built by one of my clubmates - almost half the weight! That Magister uses a very small Lipo so it's much cheaper to equip. It's just the build philosophy - minimise the weight of everything compared to making everything strong, interlocking and from sheets of ply. People are realising that the strong construction used for decades on i.c. powered models is not necessary for electric models. However I expect your model will fly well as did the designer's original. Agreed; whilst the quality of the build here is great, this is not a model I’d consider based on these pics. It seems heavily over-engineered for an electric powered model of this type that is highly unlikely to be flown in a high speed or aggressive manner. Edited August 9, 2023 by MattyB Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted August 13, 2023 Author Share Posted August 13, 2023 Now begins the construction of the wing.The main spars are made of solid plywood 13X6mm. One spar weighs 44g The same spar made of hard balsa weighs only 14g.This would be a weight reduction of 120g The main spar is moulded I therefore think that the surface has enough stability even with balsa spars. What is your opinion? Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted August 13, 2023 Author Share Posted August 13, 2023 Sorry, I mean the wing, not surface Quote Link to comment Share on other sites More sharing options...
kc Posted August 13, 2023 Share Posted August 13, 2023 Bernd, if your model is expected to weigh anything like the 8lbs /3629g then maybe the spars are not the best things to lighten. If you expect to be much lighter then maybe reduce material, but better stay safe! But is the spar made from 13 x 6 ply? The plan seems to say Obeche which is an African hardwood but it's not ply. Obeche probably is used to make plwood but in this instance I think the designer meant solid Obeche wood. I would expect Obeche to be slightly lighter than spruce but not quite as strong - not much in it though. I suppose the spar could be made lighter by laminating 3 mm x13 balsa with 3mm x13 spruce or obeche. May not be worthwhile though - I would suggest saving weight elsewhere such as the wing sheeting. Quote Link to comment Share on other sites More sharing options...
kc Posted August 13, 2023 Share Posted August 13, 2023 Bernd, if your model is expected to weigh anything like the 8lbs /3629g then maybe the spars are not the best things to lighten. If you expect to be much lighter then maybe reduce material, but better stay safe! But is the spar made from 13 x 6 ply? The plan seems to say Obeche which is an African hardwood but it's not ply. Obeche probably is used to make plwood but in this instance I think the designer meant solid Obeche wood. I would expect Obeche to be slightly lighter than spruce but not quite as strong - not much in it though. I suppose the spar could be made lighter by laminating 3 mm x13 balsa with 3mm x13 spruce or obeche. May not be worthwhile though - I would suggest saving weight elsewhere such as the wing sheeting. Quote Link to comment Share on other sites More sharing options...
kc Posted August 13, 2023 Share Posted August 13, 2023 Or 6mm spruce alongside 6mm balsa might be equally good. Of course 1/4 inch is 6.35mm and 1/2 inch is 12.7mm and this is where metric / imperial can make a difference with the fit to precut ribs- a sloppy fit perhaps or too tight! Depends on whether ribs were cut to exact imperial dimensions or to fit available metric sizes of wood. Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted January 14 Author Share Posted January 14 Sorry for the long break, but I still had a Dauntless from Phönix to build and now I continue to build the M23.I wanted to reduce the weight of the wing and had installed a main spar made of very hard balsa. This saves a total of 120g and is still stable, but thanks for your advice. One wing now weighs 362g and that is a good value 1 Quote Link to comment Share on other sites More sharing options...
Bernd Lewerenz Posted January 14 Author Share Posted January 14 The wing and the tail unit are covered with Provicover 2 from Toni Clark. The fuselage as well.By the way, if you are interested, I can also describe the construction of the Dauntless, which has a wingspan of 144cm and is equipped with electric retractable landing gear.Off course, in an other thread 5 Quote Link to comment Share on other sites More sharing options...
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