Stephen Jones Posted December 31, 2015 Share Posted December 31, 2015 Hi , The holiday season has allowed me some spare time to work on one of my many unfinished plans. I have finally finished this plan. Unfortunately i still can not take pictures so i have drawn over the outline so you can see it. The wings i have CAD drawn and the rest is hand drawn. It has a wing span of 44 inch and a semi symmetrical airfoil so hopefully it will cope with windy conditions. I am thinking on powering it with a ic engine .15 to .20 so i can just fuel and fly and just fuel and fly and just fuel and fly ................ you get the idea. It will also be easy to power it with electronic set-up and there is easy access for a 4s 3000ma Lipo. And as for the name i was thinking maybe Fish Tail or maybe Dolphin.. Steve Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted April 21, 2016 Author Share Posted April 21, 2016 Hi, Now that the weather is getting warmer i can work in my loft/workshop, I have printed out the wings and cut out the ribs ready to make a start on making the wings. No doubt, this one has been done before too. I will build it anyway. Steve Quote Link to comment Share on other sites More sharing options...
onetenor Posted April 22, 2016 Share Posted April 22, 2016 Dolphus Propellerus perhaps. or the other way round/ You know Vicky Verky Don't mind me I'm barking He He He Quote Link to comment Share on other sites More sharing options...
Rosco Posted April 22, 2016 Share Posted April 22, 2016 Flying Fish? Quote Link to comment Share on other sites More sharing options...
cymaz Posted April 22, 2016 Share Posted April 22, 2016 Porpoise ? Quote Link to comment Share on other sites More sharing options...
trebor Posted April 22, 2016 Share Posted April 22, 2016 COD + ( ,s wallop ) ( piece ) ( chips ) Quote Link to comment Share on other sites More sharing options...
IanN Posted April 22, 2016 Share Posted April 22, 2016 Nice. Looks right so it should fly right That underfin thingy might be a bit vulnerable when landing, though? Although the benefits of electric are manifold, there is a huge amount to be said for "fuel and fly, fuel and fly, fuel and fly". Some of my very best days at the patch have been doing exactly that Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted April 23, 2016 Author Share Posted April 23, 2016 Hi, Some nice suggestions there . Ok, not been able to do much as work and Swmbo has kept me busy , cut a few pieces of wood and had to give up or get my ear chewed off. Anyway here is some background on what and why i have gone about the design. The under fin will be ply sandwiched between two sheets of balsa and will be dual purpose . It should help keep the nose down on belly landings and if i go for adding wheels should then work as a tail skid. The elevator hangs behind the fuselage so that the control horn can be fitted to the top of the elevator but will also be able to retract within the fuselage to help streamline. The rudder will have a toque rod fitted so that can be streamlined within the fuselage. The ailerons on the wings will also be operated by toque rods to one standard servo mounted in the Centre of the wing which in turn will also help streamline . The wings i have decided to go with a thin semi symmetrical wing and the aerofoil will be a rg15 . Oh nearly forgot to mention there will also be 2.5 degrees of washout. Steve. Edited By Stephen Jones on 23/04/2016 23:57:03 Quote Link to comment Share on other sites More sharing options...
cymaz Posted April 24, 2016 Share Posted April 24, 2016 The under fin might be off after a few landings, any skewing on landing it might snap. Keep at the build, I'm in Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted April 25, 2016 Author Share Posted April 25, 2016 Posted by cymaz on 24/04/2016 06:46:42: Keep at the build, I'm in Thank`s In regards to the under Fin i have built Many models with the under fin and had no problems. Short Circuit. Southerner 60 My Sports 40. Excuse the old poor Pictures without taking new pictures of the fins . You get the idea. Steve Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted April 25, 2016 Author Share Posted April 25, 2016 Ok i have completed one wing panel. Started cutting the spars, leading edge, sub trialing edge for the next wing panel then had a look through my stock only to find i have run out of 1/16th sheeting. Then it dawned on me that i had forgotten to fit the webbing between the spars on the wing i have already completed. I have checked my wing panel for strength and i do think it needs the webbing . So do i scrap it or do i try and cut a 1/16th slice either side of the bottom spar and insert some webbing , Anyone else made this mistake ? Steve Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted May 7, 2016 Author Share Posted May 7, 2016 Ok, Managed to do some work on this one today , Completed a new rhs wing panel with the webbing in place this time that will teach me for going too fast without thinking . Anyway happy with the new panel , I have tacked the Aileron in place for the time being and will cutout after the LHS has been completed. In regards to the 1st rhs panel i will as a experiment cut some holes into the top and bottom sheeting and fill with expanding foam to see how it turns out , has to be better than just chucking it in the bin . One never knows it might turn out ok , a foam filled wing in reverse. Steve Quote Link to comment Share on other sites More sharing options...
mightypeesh Posted May 8, 2016 Share Posted May 8, 2016 Hi Steve. Please post your results re the expanding foam as to whether or not it rips it apart even with exit holes! I like a bit of foam but have not got around to trying it yet......... Cheers, Simon Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted May 8, 2016 Author Share Posted May 8, 2016 Posted by mightypeesh on 08/05/2016 08:45:43: Hi Steve. Please post your results re the expanding foam as to whether or not it rips it apart even with exit holes! I like a bit of foam but have not got around to trying it yet......... Cheers, Simon Will do, I think i have some expanding foam left after fitting a new patio door if not i notice Lidi are currently selling the stuff at £2.99. Steve Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted May 9, 2016 Author Share Posted May 9, 2016 Hello again, Ok so have been building the 2nd wing. As usual been having problems taking pictures, So this picture shows how the ribs sit on the building board and has the top skin fitted as when i tried to take pictures of the ribs and leading/trailing edge pined to the plan the picture looked Crap. The building tabs help build in the wash out. Here you can see the wing is mounted upside down on some more building supports, of coarse the tabs now need cutting off from both the front and back of all the ribs it then needs to be pinned down Via the leading and trailing edge so that the bottom skin can be fitted. Steve Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted May 10, 2016 Author Share Posted May 10, 2016 OK Using expanding foam to fill the void within a built up wing. I covered the lower sheeting with masking tape then made some holes , using a light i could see through the wing and determine where the ribs and spars are. 1. two hole where made in opposite corners. 2. two holes made in the middle of the ribs. 3. three holes made in between the ribs. 4 varied the amount of foam injected into the holes After injecting the foam into the holes the foam was slow to start expanding , and when it started to expand was very rapid which was fine as it oozed out of the holes and i had too allow it to pour out onto some plastic sheeting . This made it difficult to gauge how much foam was needed in each segment of the wing and awkward to work on the next segment until the expansion had slowed down . By holding the work upside down to allow the excess foam to pour out i was able to manage the build up . Once the foam had stopped expanding i scrapped off the excess foam while it was still soft but no more foam would ooze out of the holes . All looked fine and dandy for a while then i started to hear a loud popping sound and could not work out what was going on . After a while all was quiet and so i removed the foam from the holes and the masking tape , it would appear that once the foam has stopped expanding it begins to harden up around its external surface and then expands a little more and with greater force and i assume that the popping sound i heard earlier was the balsa skin being forced off the ribs as there are waves in the sheeting . The wing is now rock solid and the foam has added 40 grams to the overall weight , was 49g now 90g Steve Quote Link to comment Share on other sites More sharing options...
cymaz Posted May 11, 2016 Share Posted May 11, 2016 It could be ribs breaking away from the wing skin As you know, you can't put foam in every hole at once and definitely not the exact same amount. This would cause different expansion in each wing bay....just a thought. Edited By cymaz on 11/05/2016 01:13:37 Edited By cymaz on 11/05/2016 01:16:26 Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted May 11, 2016 Share Posted May 11, 2016 I like the look of this Steve, the design should work and the wash-out is good. Not sure why you were worried about the webbing though. On a fully sheeted wing like this it won't make a scrap of difference. All of the bending loads are transmitted longitudinally through the top and bottom skins, tensile in the lower and compression in the top. Reverse when upside down. As long as the join between the two panels is secure you'd never get that to bust in the sky. Quote Link to comment Share on other sites More sharing options...
mightypeesh Posted May 11, 2016 Share Posted May 11, 2016 Hi Steve. Resounding success if all it does is deform the surface and rips the internals apart whilst making a sticky mess! Thanks for the experiment and results though, its all interesting stuff. Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted May 12, 2016 Author Share Posted May 12, 2016 Hi mightypeesh, i would not call it a success, as i would not use the wing with ripples in it . It does look ok but when you run you're hand over it you can feel the ripples and when you look at it side on you can see the ripples. I could of just squirted a little foam in near the spars and then it may of been better or kept the wing compressed . Maybe some further test should be conducted at a later date. Steve Quote Link to comment Share on other sites More sharing options...
mightypeesh Posted May 12, 2016 Share Posted May 12, 2016 Hi Steve. I was being ironic saying it was a success, I would not use it either - sounds like further tests are not needed! Cheers, Simon Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted May 17, 2016 Author Share Posted May 17, 2016 Ok, i now have two completed wings, I have fitted the final Aileron and sanded the tip to shape . The two half have now been glued together and when dry i shall wing bandage them with epoxy resin and glass cloth. Steve Quote Link to comment Share on other sites More sharing options...
Fredrum Posted May 19, 2016 Share Posted May 19, 2016 Watching with interest Steve. I like how you have done the joinery on the wing. With that layout and wing section, it looks like it could quite slippery and aerobatic with the right power plant. You want a fish with attitude, how about Mako or Barracuda? Quote Link to comment Share on other sites More sharing options...
Stephen Jones Posted May 19, 2016 Author Share Posted May 19, 2016 Posted by Fredrum on 19/05/2016 14:01:11: Watching with interest Steve. I like how you have done the joinery on the wing. With that layout and wing section, it looks like it could quite slippery and aerobatic with the right power plant. You want a fish with attitude, how about Mako or Barracuda? Thank you . I have now completed the wing and i am very happy with the way it looks and feels, very light at 225g yet is very ridged and strong . I am hoping for a nice slippery acrobat, it certainly looks as though it will be, lets hope it doesn't turn out as Terbour has suggested CODs wallop Steve Quote Link to comment Share on other sites More sharing options...
trebor Posted May 20, 2016 Share Posted May 20, 2016 How about, Omega 3 It's slippery and fishy. Edited By trebor on 20/05/2016 07:40:09 Quote Link to comment Share on other sites More sharing options...
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