Harry Twist Posted November 28, 2015 Share Posted November 28, 2015 Hi All, it's a a wet Saturday afternoon in Derbyshire so ..... I thought I would share some progress so far of what I am hoping will be a worthwhile PSS project. I have long liked some of the Luft 46 designs and especially like the B & V 215, so thought I would try a PSS version. From the start please can I add this won't be a build blog more an occasional posting of progress and sharing pictures! I have used as a basis for the design - a copy of and old RCME plan for a depron BV215 ( thanks Glenn Block!) plus an Outerzone freeflight plan also - both modified but great as a basis for dimensions and plan form. Structurally I have used a 3mm ply keel plus ply formers for the core - then 3mm balsa planked the fuz. My wife thought I was building a sailing galleon at one point! (I suppose if it doesnt fly I could revert to that). I am now at a point where I have basically made a kit of parts. Control will be by elevons and the servos are fitted outboard on the wings.The model will be two piece with a removeable wing. Decided to try to lighten where possible - hence the cheese holes! So far I am up to just over 1 lb for wing/winglets/fins and fuz combined (including 2 servos!). Hoping to be around 2lbs all up.Span is 46". Few questions I still need to settle in my mind - I want to make the anhedral tips knockoffable/removeable, so any ideas welcome! The depron plan calls for a GWS P-38 canopy - cant seem to obtain one - so I will probably make one up. Finishing - not sure- possible lightweight glass fuz and solartex wings - then paint all over - (but dont really want to cover up all that woodwork!). Will keep pushing along and post as I hopefully progress! Regards H Edited By Harry Twist on 28/11/2015 14:59:37 Edited By Harry Twist on 28/11/2015 15:01:04 Edited By Harry Twist on 28/11/2015 15:06:03 Quote Link to comment Share on other sites More sharing options...
Phil Cooke Posted November 28, 2015 Share Posted November 28, 2015 Very nice Harry - don't think we've seen one of these on the slope before so congrats on finding an original subject - will be great for the slope looking at it too - look forward to seeing it soon! Quote Link to comment Share on other sites More sharing options...
Matt Jones Posted November 28, 2015 Share Posted November 28, 2015 Quality craftsmanship, subscribed! Quote Link to comment Share on other sites More sharing options...
Erfolg Posted November 28, 2015 Share Posted November 28, 2015 Now that is tastety, it will be great with an electric motor. Quote Link to comment Share on other sites More sharing options...
Andy Meade Posted November 30, 2015 Share Posted November 30, 2015 Great stuff Harry glad you decided on the build blog in the end. I hope to start my little 600mm span version in January I was just going to stick my fins on with a couple of magnets - should work well enough. Quote Link to comment Share on other sites More sharing options...
Steve Houghton 1 Posted November 30, 2015 Share Posted November 30, 2015 Looking forward to seeing how the build goes Harry. Subscribed! Quote Link to comment Share on other sites More sharing options...
Scott Edwards 2 Posted December 9, 2015 Share Posted December 9, 2015 Ooooh that looks nice ! I'm fascinated by the late WW2 experimental Luftwaffe program, amazing period of development. really looking forward to seeing this develop Quote Link to comment Share on other sites More sharing options...
onetenor Posted December 10, 2015 Share Posted December 10, 2015 I too like these late experimental jobbies too. Keep up the good work Quote Link to comment Share on other sites More sharing options...
Harry Twist Posted December 21, 2015 Author Share Posted December 21, 2015 Thanks for all the positive comments! A little more progress to share - fuselage fully planked in and sanded - yes - I did need a little lightweight filler - and may yet need a little more when we get down to the fine finishing! Elevons and winglets sellotaped in place to show the overall look. I have added short carbon fibre rods in a couple of what I think are vulnerable places - first to strengthen the extended wingtips and second for the "cut back" section near the wing root. I am planning to add a small flat turret behind the cockpit as per original. Making servo boxes and covers took a while and not sure if I am overly happy with them so may rethink this part of the build. The model is roughly 1:10 scale and I have bought a couple of latex German pilots (need painting) to go in my yet unmade cockpit. Still debating in my mind on finish colours and method. Best wishes to all. Regards H Edited By Harry Twist on 21/12/2015 00:13:34 Edited By Harry Twist on 21/12/2015 00:17:45 Edited By Harry Twist on 21/12/2015 00:18:31 Quote Link to comment Share on other sites More sharing options...
Harry Twist Posted January 22, 2016 Author Share Posted January 22, 2016 Hi All, Thought I would update a little more progress with my B&V 215. Model is now fibreglassed all over fuselage and wings. Winglets and elevons are solartex covered. Photos show the model with everything sellotaped together - (so ignore bits hanging off at funny angles!)- just done for pictures. Also ignore the yellow solartex - this will be overpainted. Canopy giving scratchy head sessions at the moment - I just cant seem to get a good fit! Now starting to think about final finish - dont have spray kit so roller and stipple paintbrush may be my method. I have decided not to have the full anhedral angle on the outer tips and will keep this to probably around 10 degrees below horizontal. Also - anyone recommend a good CoG calculator for flying wings (with outboard anhedral winglets!). Couple of photos attached! Regards Harry Quote Link to comment Share on other sites More sharing options...
Andy Meade Posted January 22, 2016 Share Posted January 22, 2016 Looking great Harry! It will be great to see this one in the flesh Quote Link to comment Share on other sites More sharing options...
Mark Kettle 1 Posted January 22, 2016 Share Posted January 22, 2016 Nice Harry, and very different. Here's a calculator - I would just ignore the winglets in calculations. **LINK** Quote Link to comment Share on other sites More sharing options...
Erfolg Posted January 22, 2016 Share Posted January 22, 2016 I was just thinking about what I at first thought was a difficult problem, From what I have read, I seem to remember that the winglets were actually set up as a short coupled tailplane rather than part of the lifting surface. At first I thought it was a book, then realised it was almost certainly a booklet "Luftwaffe, Secret jets of the Third Reich" by Dan Sharp. The model that it is covered is the B&V 212. If on the other hand you decide to set it up as a flying wing, then i have no immediate easy solution, Other than treat each set of wings independently of each other and set the final CG by proportion of the relative areas. Or make a profile model, with the wing and winglets at exactly the same incidences and test glide, whilst weighting until a satisfactory CG is obtained. Then again by proportion set the model CG. With a model you can try both approaches and see which works the best. Quote Link to comment Share on other sites More sharing options...
Harry Twist Posted January 22, 2016 Author Share Posted January 22, 2016 Hi Mark, Many thanks for the link - I will ignore outer winglets for the calc. I am tempted to cut them down in length (span) a little also - I am making them knockoffable, but even so they are a bit vulnerable hanging out and down! Regards H Quote Link to comment Share on other sites More sharing options...
Mark Kettle 1 Posted January 22, 2016 Share Posted January 22, 2016 Hello Harry your welcome, I bet you'll be surprise how much weight you will need in the nose, I would first lean towards the 20% range for balance. Edited By Mark Kettle 1 on 22/01/2016 22:38:58 Edited By Mark Kettle 1 on 22/01/2016 22:40:37 Quote Link to comment Share on other sites More sharing options...
Harry Twist Posted January 22, 2016 Author Share Posted January 22, 2016 Thanks Erflog - I was going to make a mini -test model - but I felt that the chance of me making a mini model and getting all the various angles correctly set up such that the mini model gave anything reasonable that could be related to the real model was fairly small! So rightly or wrongly I rejected that idea. So my plan at the moment is to use maths to get somewhere close - set up the Cog a little forward of what is predicted and test glide over a shallow slope and long grass - prior to launching off a serious hill! Even then I expect adjustments to be a made over probably ( if it survives!) several flights. Just re read the second part of your post - actually a profile model may be a good move _I will look at mocking one up. Regards H Edited By Harry Twist on 22/01/2016 23:14:30 Quote Link to comment Share on other sites More sharing options...
Erfolg Posted January 23, 2016 Share Posted January 23, 2016 After posting last night, I did read the section on the B&V212,. sic. This high sweep pushed the wing joint on the fuselage so far forward ..... The high sweep.....but on the other hand it means that the tail booms can be reduced to insignificant stumps, without affecting the effectiveness of the control surfaces. The B&V215 was a scaled up B&V 212, into all weather night fighter. As you can see below I tried the same or similar idea on a flying wing. The centre section being a std. E205, the outboard panels have a modified E205 to incorporate reflex. The model in this form handles well. Better when the same design was made with a all reflexed wing. It was a prototype for a BARCS Leauge unorthodox section. The full size at +100 was never built as i stopped aeromodelling, to concentrate on work place and family commitments. As you can see when returning (to the hobby) I changed it into a electric powered glider. I set it up using the same CG calculator that a link has been provided. The only difference is that I would just use it for the centre section. This at worst would be conservative. Quote Link to comment Share on other sites More sharing options...
Harry Twist Posted February 3, 2016 Author Share Posted February 3, 2016 Hi All, Well all that lovely woodwork on my scratch B&V 215 has been covered over for good with paint! ( I reckon some day I will leave a model unpainted and fly it naked in bare wood!) First primer/ undercoat added today. Must confess to being not wholly happy with the finish, but consoled by the fact that I will probably sand most of it of again! I do like the look of the model in white - so I am thinking of winter camouflage as a possible final colour scheme - quite a contrast in temperature to my initial North Africa desert scheme plan! I'm helped by the fact that none of these aircraft (thankfully) got to see service - so I reckon I am fairly free colour scheme wise. Couple of pictures to show progress so far. Still much to do around cockpit and the (nightmare) outer winglets...but getting there! The model is looking increasingly menacing however....! Regards H Quote Link to comment Share on other sites More sharing options...
Andy Meade Posted February 3, 2016 Share Posted February 3, 2016 Looking lovely Harry, nice job! Quote Link to comment Share on other sites More sharing options...
Rich Bailey Posted May 21, 2018 Share Posted May 21, 2018 Hello Harry Would like to build a similar project, but power it with a EDF, 90 mm . Need plans! Quote Link to comment Share on other sites More sharing options...
Martin Gay Posted May 21, 2018 Share Posted May 21, 2018 Rich,Have a look at www.casadabalsa.com Quote Link to comment Share on other sites More sharing options...
Mark Kettle 1 Posted May 21, 2018 Share Posted May 21, 2018 Also some plans Rich on 'outer-zone' Link **LINK** You can print them off and glue together the tiled print-offs into a plan you can then scale up if need be. Quote Link to comment Share on other sites More sharing options...
Andy Meade Posted May 21, 2018 Share Posted May 21, 2018 I do enjoy a pair of pointy shoes in my plan's views Quote Link to comment Share on other sites More sharing options...
Mark Kettle 1 Posted May 21, 2018 Share Posted May 21, 2018 Andy my arms are not long enough to be able to stand away enough LOL. Quote Link to comment Share on other sites More sharing options...
Harry Twist Posted May 21, 2018 Author Share Posted May 21, 2018 Hi Rich, Thanks for your message ref the B&V215, basically I modified a free plan from RCME Jan 2011, which was for a depron pusher ( there are build blogs on here from around then, plus there is some YT footage of built pusher models flying). I have adapted this for slope and built it in balsa - basically the plan provIded a good outline shape for the fuselage and wing / winglets. I also used (as Mark has indicated above) the Outerzone plan to help with other details. For a 90mm edf I think the model would need to be scaled up- not sure to what span? The current wingspan is around 40 inches and the fuselage section approx 4 inches round ( its a flattened ellipse but approx 4 inches in section). The link provided by Martin (above) should also help in homing in on a plan. I do have the original RCME depron plan if that helps. Attached are a couple of photos of the model as it is today. It took me three attempts to blow a canopy and I'm still not sure its right- so its just sat on top for now. Some detailing still needed ref decals etc but overall I'm happy with the result so far. Edited By Harry Twist on 21/05/2018 21:11:58 Quote Link to comment Share on other sites More sharing options...
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