Colin Leighfield Posted June 24, 2015 Share Posted June 24, 2015 I suppose that either of these ideas will work Steve, you could make one of each and see which you prefer. Because I've been mixing balsa and Depron, I'd probably laminate 1/32" balsa between two sheets of 2mm Depron and form a tab on each end to insert into the fins, that would be very stiff and light. Use your own judgement though, you don't seem to get it wrong so far! Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted June 24, 2015 Author Share Posted June 24, 2015 I was rather hoping that some of the guys that have experience in building from Depron would chip in and offer there input . But i tell you what Colin that has given me a excellent idea . I hadn't given it much thought on how i should hinge the elevator but your suggestion seems to solve two problems in one. So if i make both the tail plane and elevator from two sheets of thin depron and sandwich both together with a single sheet of thin plastic that will stiffen both parts also providing the hinge . Cheers Steve Top Answer Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 25, 2015 Share Posted June 25, 2015 I would be careful using the same plastic as a hinge and a stiffener, the qualities you need for a hinge is flexibility, which is exactly what you dont want in a stiffener..... Personally I would go for some a balsa depron /sandwich and mylar type hinges embedded into the balsa Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted June 25, 2015 Share Posted June 25, 2015 Good points from Dave. I've found thar even using 1/32" balsa, with the grain running longitudinally, laminated to 2mm Depron makes a very stiff, warp free structure for a minute amount of weight. 1/16"/1.5mm would do it as well, depending on what finished section thickness you are looking for. Using Mylar or furry hinges, rather than cut and insert after laminating, you could put them in first, i.e. Cut out the shapes for the hinges from the balsa, or plastic, and glue the laminate to one piece of Depron, glue the hinges in place, then glue the other piece of Depron on top. Might try that myself the next time! Composite structures are the future((!) (I've got a special talent for waffling). Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted June 25, 2015 Author Share Posted June 25, 2015 Hi , I wanted to have ago at building a all Depron model , I know i have used wood spars and have realized i could of done it without them in . I used plastic in the booms / Fins as i felt they might get damage so a little added strength but no loss in flexibility . The tail plane i could build out of 3/32 Balsa as i already know that will be fine, but it kinda goes against the idea of a depron model . Dilemma , Foam or wood or both . I may end up going for wood as the other foreseeable problem is that the control horn is at one end of the elevator and so foam might not give as good a control authority . Steve Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 25, 2015 Share Posted June 25, 2015 Hi Steve Traditional builds use Balsa and Ply - Depron Builds use Depron and Balsa - same difference! if you want to be hi-tech you can always use some carbon rods/strips As for control surface stiffness - a little carbon rod works wonders (or you could be really rebellious and sneak in a bit of balsa ) Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted June 25, 2015 Share Posted June 25, 2015 That is coming along very nicely. "Simon will probable disapprove of this " Not at all. My only concern using carbon with Depron is the huge difference if their structural characteristics. Carbon is so much stiffer (and heavier!) that it ends up doing most, if not all, of the work and a small diameter rod or tube in a bigger structure is a very inefficient use of material! I have found a balsa leading edge to the control surface works well as it acts as a torque rod. And the control loads are less if the whole plane is built light ............ Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted June 26, 2015 Author Share Posted June 26, 2015 You might well be right Simon , I have just weighted the sum of all the parts so far, including Radio gear battery motor esc and so far it weighs 1 Lbs , Steve Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted June 27, 2015 Author Share Posted June 27, 2015 Ok , I was going to put this motor in 2826-05 , but i now fear it may well be over kill even if i put a small prop on. The spec for this motor reports it as a 350 watt motor . A nice snug fit . as you can see the motor is tight up against the formers , but when i have finished to build of the body i will hollow that area out . If it was made from wood it would be self supporting by now , but being foam i will have to glass the outside of it . Steve Edited By Stephen Jones on 27/06/2015 00:46:49 Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted June 27, 2015 Author Share Posted June 27, 2015 I have made up the wing brace and glued depron in between the ply . They are now in one wing drying , so hopefully i can fit the wings to the body tomorrow . Unfortunately my daughter has a party to go to and guess who will be taking her . Steve Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted June 27, 2015 Share Posted June 27, 2015 This is going to fly very well. Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted June 27, 2015 Author Share Posted June 27, 2015 Some more work done on the model today, I used 3mm Depron sheet to form the Ducting. Steve Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted June 27, 2015 Author Share Posted June 27, 2015 The large holes allow for the wing to be positioned. I used no More Nails Wood Glue to joint the wings together as it is quick but slow enough for me to position. Steve Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 27, 2015 Share Posted June 27, 2015 Looking really good!! you sure you haven't used depron before????? Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted June 27, 2015 Author Share Posted June 27, 2015 Thank`s Dave , That will be a combination of bad lighting and crap pictures , Steve Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted June 27, 2015 Share Posted June 27, 2015 Indeed a very neat build. Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted June 28, 2015 Share Posted June 28, 2015 Nice work Steve. Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted June 29, 2015 Author Share Posted June 29, 2015 Thank`s Gents, I have re weighted it , and it`s expected AuW will be just over 1 Lbs . So i have gone through my spare motors and decided to use a 2808/08 on a 5x5 prop i am pulling just over 200w with this one . So i think this will be a better match for the foam version. I have made a load of 5mm rings to make up the nose and glued in the motor mount now that i am happy with my motor selection. Will post some pictures tonight. I have ordered a canopy so hopefully that will arrive soon as i will be ready for that part soon . Also i need to put a order in for some servos as that part is also next . Steve Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted June 29, 2015 Author Share Posted June 29, 2015 Hi, i have started on the nose , As you can see eight slices of 5mm Depron rings make up the nose. It is only tacked on temporary for the moment i will fit it after the radio gear has been installed and the canopy made . It will then need sanding. Steve Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted June 29, 2015 Author Share Posted June 29, 2015 The motor mount has now been fitted. I lined up the centers of the body with a line draw on the building board using a set square. And use a battery which was lined up with a perpendicular line to ensure all is square. Added some foam packing to transfer the forces evenly onto the lower body. Fitting the new motor needed the motor mount reversing so that the wires would pass through the hole , luckily the mounting holes match . Steve Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted June 29, 2015 Share Posted June 29, 2015 That look very beat but it looks to me like you must not forget to turn the prop round before you fly. Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted June 30, 2015 Author Share Posted June 30, 2015 Posted by Simon Chaddock on 29/06/2015 22:18:36: That look very beat but it looks to me like you must not forget to turn the prop round before you fly. LOL ,Classic , The number of times i have pointed the same mistake out to others , only to do the same myself . Steve Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted July 5, 2015 Author Share Posted July 5, 2015 Hi , Work has stopped me working on this model , But i managed to sneak some time on this today. After weighing different Tail plane to help me decide which to go for . I tried 5mm Depron found it ok , but needed a little stiffening so added plastic to the leading edge. I then tried two layers of 3mm Depron and carbon rod. And i also weighed a balsa Tail plane . And as there was only 0.2g of difference between the lightest Depron and the Balsa . I went for the Balsa as it was the stronger of the three. Steve Edited By Stephen Jones on 05/07/2015 19:46:17 Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted July 5, 2015 Share Posted July 5, 2015 Going to look a little stunner in the air...... Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted July 5, 2015 Author Share Posted July 5, 2015 I have also added foam to the Leading edge of the wings also to the wing tips . Then it was time to move onto the Speed controller. I glued the Esc to the underside of the Air ducting. Withe the wires coming out at the top. This was the glued on top of the sides of the ducting. Steve 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.