SwaziFlyer Posted April 30, 2015 Author Share Posted April 30, 2015 So the skinning is a bit challenging, I only have foam safe Cyno, I have scoured all of the hardware stores looking for foam safe adhesive but no luck so things are going slowly, will hopefully make some progress this weekend. Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted April 30, 2015 Share Posted April 30, 2015 I get my UHU Por from Ebay....... An alternative is Evostick Carpet spray adhesive - other brands might be ok too Quote Link to comment Share on other sites More sharing options...
SwaziFlyer Posted April 30, 2015 Author Share Posted April 30, 2015 will go and have a look at the carpet shops. problem with Ebay is that the post normally costs more than the product to send Swaziland. Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted April 30, 2015 Share Posted April 30, 2015 The carpet spray glue you want is the one designed to glue foam underlay - its a contact adhesive - but spray outside as it seems to go everywhere - its great for the inside of wingskins but I think you would need to sprap into a cup then smear on to the ribs and spars Quote Link to comment Share on other sites More sharing options...
SwaziFlyer Posted April 30, 2015 Author Share Posted April 30, 2015 Success. Went to see a mate who does upholstery. Managed to aquire about 350 ml of contact adhesive. Will have to make up a foam brush of sorts but a step I'm the right direction Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted April 30, 2015 Share Posted April 30, 2015 Posted by SwaziFlyer on 30/04/2015 15:53:43: Success. Went to see a mate who does upholstery. Managed to aquire about 350 ml of contact adhesive. Will have to make up a foam brush of sorts but a step I'm the right direction Before you go near your model with it TEST it on some scrap Depron - slap some on and leave it for at least 30 mins to check its not going to eat the foam..... same goes for any new glue.... Once bitten twice shy PS want to buy some molten depron modern art? Quote Link to comment Share on other sites More sharing options...
SwaziFlyer Posted April 30, 2015 Author Share Posted April 30, 2015 Thanks Dave. I am quite confident it will be ok as they bring it in specifically for foam but I had intended to do a test. That's why I love this forum. Everyone always looking out for each other. Molten depron art, hmm do you ship to swaziland. Quote Link to comment Share on other sites More sharing options...
SwaziFlyer Posted May 4, 2015 Author Share Posted May 4, 2015 Hey Guys, so have done some skinning with using contact glue, firstly had to remove some of the skin that I had put on with Cyno, fortunately no damage was done. So lots of learning done and things to remember for next time. Have put some filler on that need a good rub down. Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted May 4, 2015 Share Posted May 4, 2015 Looks like you are getting into the swing of this Depron stuff, thats looking very good What are you going to cover the skin with? Water Based Pu, glass tissue, paper or something else? Quote Link to comment Share on other sites More sharing options...
SwaziFlyer Posted May 4, 2015 Author Share Posted May 4, 2015 Some of the lines are a bit out, will make sure i oversize the formers a bit next time to give some shaping room. i think i will just paint this one with some acrylic but haven’t put to much thought into it yet, my main purpose for this build is to see if I can attach the wing to the fuselage properly and get it flying nicely. So I will go with the dowels through the fuselage but im not sure I like the method on the plan for securing the wing. My concern is that it may compress the fuselage to much unless I fit a whole lot of ply . Matt Quote Link to comment Share on other sites More sharing options...
Tony Bennett Posted May 4, 2015 Share Posted May 4, 2015 i would fit two tubes across the inside of the fuselage that will take the dowls, this will stop the fuselage compressing and will give a good location point for the wing. tony. Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted May 4, 2015 Share Posted May 4, 2015 Yep Tonys suggestion is a good one, but you will need to put some ply doubler's round the tubes to stop them slowly getting out of alignment with flying stress and fitting/dismantling over time - doesn't have to be thick though Quote Link to comment Share on other sites More sharing options...
SwaziFlyer Posted May 6, 2015 Author Share Posted May 6, 2015 Hi All, does anyone have any clever ideas of fixing the wings rather than the "Cup Hooks" and elastics as suggested in the plan Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted May 6, 2015 Share Posted May 6, 2015 Posted by SwaziFlyer on 06/05/2015 13:36:52: Hi All, does anyone have any clever ideas of fixing the wings rather than the "Cup Hooks" and elastics as suggested in the plan Nylon bolts from inside the cabin into captive nuts on the wing root rib - if combined with wing tubes (that would take all the torsional strains - the bolts could be quite small as they only have to keep the wing root against the Fus Some lite ply across the inside of the wing root rib bonded at each end to the wing tubes would be fone for holding the captive nuts too Quote Link to comment Share on other sites More sharing options...
SwaziFlyer Posted May 6, 2015 Author Share Posted May 6, 2015 thank you Dave, that seems a much better idea than elastics and cup hooks, will see what i can do. Quote Link to comment Share on other sites More sharing options...
SwaziFlyer Posted May 20, 2015 Author Share Posted May 20, 2015 Hi all, just a small update, only had a few minutes here and there for building. I skinned the fuselage as the previous pics show, have been filling here and there. I then started with the placement of the wing supports/dowels. So lots of school fees here, I should have sorted out the placements before I did the skinning so some surgery had to be done as the dowels were not parallel with the horizontal stabiliser. I have also been rethinking the wings and have cut new paper templates for the ribs, my plan is to do a 3mm depron centre section, cut the ribs in half and glue them above and below, my reason is to give a better centre section reference and take any twist out of the wing. My only concern is how to remove the 1.5mm from each section of the rib. Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted May 20, 2015 Share Posted May 20, 2015 Depends on what wing profile you have, as long as there is no under-camber you should be able to mark out the wings full size, mark the chord line, then cut them out in full, slice in half down the chord line, then use a balsa stripped set to 1.5mm to whip off the edges off the inside of each half Quote Link to comment Share on other sites More sharing options...
SwaziFlyer Posted June 5, 2015 Author Share Posted June 5, 2015 Hi there friendly Builders. sorry this blog has slowed down so much, unfortunately life has got in the way of building, will hopefully get back to the wing in the next few weeks. Quote Link to comment Share on other sites More sharing options...
SwaziFlyer Posted September 11, 2015 Author Share Posted September 11, 2015 If there is anyone still following this sorry it has had no progress. Have not been able to get any 6 mm depron and need to get some proper snakes for the ruder and elevator. I do have a question. I have just completed a foam trainer and did the maiden today, it flew well at low speed but over half throttle it would climb steeply and then sit on its tail. Power off it glides well and the stall is ok so don't think it is a c issue. Could it be that I need more down thrust or could it be related to the wing angle relative to the fuselage. It is a high wing, resembles a cessna 172. Thanks. Any feedback would be helpful Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted September 11, 2015 Share Posted September 11, 2015 Yep still watching your build..... As for the trainer, Climbing under power is what they should do, if it glides well then its probably not the wing incidence - first thing I would check is the tail plane seating is it square and at the right level if is was slightly nose down (negative AoA) that would cause the symptoms you describe, other than that some down thrust on the motor may cure it Quote Link to comment Share on other sites More sharing options...
SwaziFlyer Posted September 12, 2015 Author Share Posted September 12, 2015 Thank you Dave. She flies fairly level at a cruise,40 percent throttle. Only two clicks of up trim. Slow flight uses a bit of up elevator and flies a bit nose up. It's on the climb out that's a problem. 80 percent throttle and she climbs nicely and then goes into a "prop hang" situation. Power off and she stalls and recovers. Thanks for listening Quote Link to comment Share on other sites More sharing options...
Rex Dyer Posted September 12, 2015 Share Posted September 12, 2015 Hey! Good to see the King of Depron back on the posts, Sir Quote Link to comment Share on other sites More sharing options...
SwaziFlyer Posted September 12, 2015 Author Share Posted September 12, 2015 You must be referring to dave as the extra is my first depron build. Quote Link to comment Share on other sites More sharing options...
SwaziFlyer Posted September 12, 2015 Author Share Posted September 12, 2015 Had a closer look at the trainer. The elevator is in line with the "thrust line" centre of motor to tail. Not sure if that is correct. The motor had a large amount of up thrust. Have corrected and will test fly when the rain goes away. Motor now sitting g at about a degree down. Quote Link to comment Share on other sites More sharing options...
Dave Hopkin Posted September 12, 2015 Share Posted September 12, 2015 The tailplane at zero incidence sounds right, but if the motor had upthrust then it would climb like hell under power - downthrust should clear that - you may find you want a little right thrust too Quote Link to comment Share on other sites More sharing options...
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