Dave Hopkin Posted June 24, 2015 Share Posted June 24, 2015 One of my favorite planes and a very practical model too So this will be based upon the Denis Bryant 68" Plan Version The changes I intend to do are Change the wing section to Clark YH as the original was (plan gives a semi-symmetrical section) Add the flaps Its not going to be a fast build as we are into flying season etc Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 24, 2015 Author Share Posted June 24, 2015 Construction Methods Wings: 6mm Depron Plate Wing, 3mm Skinning 6mm Depron Tapered Fuselage box with turtle deck "box" on top Glass Tissued Weight of Traditional build 11lb - Depron Target Under 7lb Electric Motor Range (to be decided later) but in the 800W range Quote Link to comment Share on other sites More sharing options...
Former Member Posted June 24, 2015 Share Posted June 24, 2015 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 24, 2015 Author Share Posted June 24, 2015 Wings will have two spars which are a 6mm Depron core sheeted in 3mm balsa Wing panel joiners will be 6mm "mortices" inside the spars so a bit of gouging and digging required And the (start of) the U/C bearing woodwork (3mm ply 6mm Depron sandwich) will be slotted into a 4mm cross piece for strength Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 24, 2015 Author Share Posted June 24, 2015 Thanks Percy, reasons I change it: The original used Clark YH, It suits the way I build wings, my flying skills don't need the areobatic performance of semi symetrical!!!! Quote Link to comment Share on other sites More sharing options...
Former Member Posted June 24, 2015 Share Posted June 24, 2015 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 24, 2015 Author Share Posted June 24, 2015 I haven't (yet) attempted a Depron Wing without a base plate, tha'ts something I want to do at some stage, but using a base plate makes things a great deal easier Quote Link to comment Share on other sites More sharing options...
Former Member Posted June 24, 2015 Share Posted June 24, 2015 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 24, 2015 Author Share Posted June 24, 2015 A good point Percy! I will be selecting the motor later on when I have a much clearer idea of the AUW, I plan to build a firewall mounting plate far enough back to accommodate both the motor and esc so there will be plenty of room in there! Quote Link to comment Share on other sites More sharing options...
Former Member Posted June 24, 2015 Share Posted June 24, 2015 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted June 24, 2015 Share Posted June 24, 2015 Lovely choice Dave, you will get a good result here I'm sure. I can see where Percy is coming from about the wing section, but the Clark YH is a reflexed Clark Y and might be fairly close to a semi-symmetrical in the way it performs. I fancy doing a big Wicko Warferry in Depron, that used the Clark YH as well. Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 24, 2015 Author Share Posted June 24, 2015 Thanks Colin, you are right the TE of the Clark YH turns upwards, so I plan to chamfer the underside of the wing rather than blending the upper (rib side) of the wing plate - that wont be an exact YH section but close(ish) Not come across the Wicko Warferry - I had to google it! Auster ish but not as fragile loooking as the Auster - would make a nice model...... whats holding you back, you know you want to...... Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted June 24, 2015 Share Posted June 24, 2015 Dave, I drew the Wicko up to I think 70" wing span years ago and I've kept the drawings. It was plywood sheeted and Depron would simulate it well. Probably no. 4 or 5 on my list, I will get there. Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 25, 2015 Author Share Posted June 25, 2015 A little woodwork and ironmongery today, to complete the centre section of the wing except the top sheeting which will go on after the outer panels are joined... There will be oleo struts attached to the exposed stub ends of the torsion bar undercart (Magisters in the RAF seldom kept the spats fitted apparently) Lumps of balsa in the front will receive the dowels for LE wing fixing The double layer of Depron on the LE is to allow sufficient material for the nose of the Clark YH section to be sanded in after the skin is applied to the top of the wing Quote Link to comment Share on other sites More sharing options...
Former Member Posted June 25, 2015 Share Posted June 25, 2015 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted June 25, 2015 Share Posted June 25, 2015 Nice choice Dave, I like that era John Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 25, 2015 Author Share Posted June 25, 2015 Posted by Percy Verance on 25/06/2015 21:49:24: Just one thing though Dave, and pardon me for pointing this out, but shouldn't the grain on those wing dowel blocks be running span-wise? I wondered when you would spot the deliberate mistake!!! I'll either have to take them out or put a ply face plate on them....... Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted June 26, 2015 Share Posted June 26, 2015 Watching with interest . Steve Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 26, 2015 Author Share Posted June 26, 2015 I have a question... Whilst the bulk of the airframe was play sheeted, the rudder and elevators were (clearly) fabic covered open framework structures, but I cant find a decent picture that convinces me the ailerons were sheeted or fabic - anyone know? Quote Link to comment Share on other sites More sharing options...
eflightray Posted June 26, 2015 Share Posted June 26, 2015 Nice to see more and more people using Depron for the bigger builds. The Magister certainly has bags of character. My first 'big' Depron build was a scratch built Dauntless at 67" span, prior to that it was just the usual Depron profiles. But I could see the uses of Depron as I felt it is very comparable to soft balsa. My Dauntless is now 8 years old a still a regular flier. I also did a Depron 'conversion' job on the TN free plan of the 72" Spitfire, plus electric power, (half the expected weight of the balsa and IC version). The Spit is a beautiful flier, very realistic in the air. Good luck with the Magister build, if it flies as good as that picture, it will be a winner. Ray Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 26, 2015 Author Share Posted June 26, 2015 I think we still have an uphill struggle to convine a lot of people that Depron is a "respectable" material for planes, but then again, anything new takes time to become fully accepted I have to confess I am still learning how to exploit the characteristics and compensate for the weaknesses of it, have to fight that urge to beef it up more than is needed! But each time I build with it I feel I get better (this will be the fourth full depron build) the first never flew, the second was almost uncontrollable, the last one flies "like a cow" as per my test pilot but we think thats a tail incidence issue as it flies along nose down, CofG is as far back as we dare, so some more experimentation will prove that theory - but hey at least its flown several times!!!!! Edited By Dave Hopkin on 26/06/2015 22:04:18 Edited By Dave Hopkin on 26/06/2015 22:05:09 Edited By Dave Hopkin on 26/06/2015 22:05:35 Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 26, 2015 Author Share Posted June 26, 2015 A little more done today in between going flying and keeping "she that thinks she should be obeyed" happy.... Horizontal Stab and Elevators almost done, attempted to get the "look" of a fabric covered elvator into the depron - not sure how effective it is... Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted June 27, 2015 Share Posted June 27, 2015 Looks good to me, if it keeps its shape and does not spring back into place that is . Steve Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted June 27, 2015 Share Posted June 27, 2015 I would guess that the ailerons would be fabric covered as well, but they might not be and beyond normal Internet investigations it's hard to check further from Toronto. Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted June 27, 2015 Author Share Posted June 27, 2015 The balsa "ribs" in the elevators make them extremely rigid so I dont believe there will be any flex in them at all I will have to keep digging on the ailerons as in some photos they look sheeted in others not so, it may be that what I am seeing as ribs on the ailerons is in fact panel lines but then again it may not be! still I don't need to address this yet as the next on the board will be the fuselage on the grounds its a lot easier to marry up a 12" wide wing stub to the fus than a 68" one!!! Quote Link to comment Share on other sites More sharing options...
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