dirk tinck Posted December 24, 2019 Author Share Posted December 24, 2019 Next job is to get the panels ''boxed-in" with 3mm balsa .This is going to be the outline of the brake-insert and needs to be perpendicular to the panel Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted December 24, 2019 Author Share Posted December 24, 2019 Then added a dubbler on the back side for the panel to rest on .Also added a former just behind the hinge line to support the hatch and to accept the hinge supports later.All in place in the next pic. The most dificult part is to get the hinge holes and pins in the right place .As they are pré drilled in the epoxy hinge-parts it's like a darts game here. Once i was happy with this i could "test" the brake opening it.To my surprise it went very well ! With the pioneer hole in the right spot it's time to enlarge it to the diameter of the brass tube i'm using to "hinge" the two parts. Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted December 24, 2019 Author Share Posted December 24, 2019 Here and there i forgot to take pic's but if any explanation is needed please ask Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted December 24, 2019 Author Share Posted December 24, 2019 Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted December 24, 2019 Author Share Posted December 24, 2019 Mounting them on a piece of cheese it looks like this : Quote Link to comment Share on other sites More sharing options...
Martin Gay Posted December 24, 2019 Share Posted December 24, 2019 "Cracking job Gromit" as Wallace would say! I think you could sell a few sets of those Dirk. Quote Link to comment Share on other sites More sharing options...
Chris Barlow Posted December 25, 2019 Share Posted December 25, 2019 Genius Dirk, right up to the part where you used a block of cheese, then it got weird! Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted December 25, 2019 Author Share Posted December 25, 2019 Hi Chris , i was just playing along with some crazy lawyer on the PSSA facebook page who asked me why i used a block of cheese to present the speed brakes..... Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted December 25, 2019 Author Share Posted December 25, 2019 Reading this blog myself did me realize there's something important missing. For the builders here who want to make speed brakes: Be sure you place the hinge supports perpendicular to the hinge pin ! If not , the brake will touch the sides in the area of the hinge-covers. For the good order i'm showing the LEFT brake here. Quote Link to comment Share on other sites More sharing options...
McG 6969 Posted December 25, 2019 Share Posted December 25, 2019 Splendid engineering, Dirk. ... even the 'cheese' part... But I think that I'll be sticking to my Dog-fuselage which is complicated enough for me. Zalige Kerst Cheers Chris Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted December 29, 2019 Author Share Posted December 29, 2019 With the two brake assemblies ready it's time for another challenge : Mounting them in the fuse ! Getting them in the right place so that the panels follow the fuse her curvatures is the hard part here . Normally that should be the drawing on the fuse but i found out the hard way that this is only in theory ! I had to make the opening a little bigger to move arround with the brake -set to find the right position. In the end i got it right. Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted December 29, 2019 Author Share Posted December 29, 2019 First test is to spray some black paint and give it a light sand to find the ''low''spots.After some filling and glassing this will be fine. Next task is to place the other brake-set in just the same position so that they open and drop the same amount. Same problem here: I had to make the opening bigger to find the right position. This resulted in some gaps to fill with balsa scrap and cyano. The hinge pins can still be removed at this point. Not sure yet how i'm going to fix this when all is glassed and painted Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted December 29, 2019 Author Share Posted December 29, 2019 Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted December 29, 2019 Author Share Posted December 29, 2019 Before closing-up the fuse ,i'm going to prepare a servo tray and hook-up the two brakes on just one servo. Time is running !!! cheers , Dirk. Quote Link to comment Share on other sites More sharing options...
Andy Meade Posted December 29, 2019 Share Posted December 29, 2019 Excellent work Dirk, neat and accurate as always Quote Link to comment Share on other sites More sharing options...
Phil Cooke Posted January 4, 2020 Share Posted January 4, 2020 They are very impressive brake units Dirk, superb craftsmanship! Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted January 4, 2020 Author Share Posted January 4, 2020 Thanks Phil,I'm pleased with them myself !They are now operational with minimal weight increase.On with the rest !! Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted January 10, 2020 Author Share Posted January 10, 2020 Good evening all ! With the speed brakes in place, i sorted out the servo tray's.Best position IMO is as close as possible to the wing saddle and as much forward as the fuse opening let's me . According to this position ,i placed the snakes and supported them as much as i could to avoid slop. Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted January 10, 2020 Author Share Posted January 10, 2020 Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted January 10, 2020 Author Share Posted January 10, 2020 Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted January 10, 2020 Author Share Posted January 10, 2020 With the brakes operational it's time for the fin.I laminated two 6 mm balsa planks and cut out the fin and started to sand it as per plan.To get the shape right i drew a line at the thickest point and sprayed the fin with some black sanding guide to see where you sand : not touching the line ! Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted January 10, 2020 Author Share Posted January 10, 2020 With the sanding of the fin ,it is now to thin to fit properly between the ply supports so i glued some 4mm balsa to the bottom part and sanded the base to fit in the fin-opening.Also opened up the place where the belcrank for the elevator is supposed to come. Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted January 11, 2020 Author Share Posted January 11, 2020 Next are the fairings besides the fin .To get these right ,i first glued-on some balsa blocks for the exhaust and sanded them with some real-thing -foto's next to me to get the shape right. From above it looks like this : Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted January 11, 2020 Author Share Posted January 11, 2020 And with the fin in place it looks like this : Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted January 11, 2020 Author Share Posted January 11, 2020 Tomorrow i'm doing the fairings at the bottom of the fin but still not glueing it in place because i want to glass it appart from the fuse. A lot of sanding and fitting last week ! Cheers buddy's ! Quote Link to comment Share on other sites More sharing options...
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