Worden
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I would have no hesitation in recommending a Laser although you may have a long wait. One of our club members spoke to Jon in the last day or so, nothing until March apparently. Sure he will update us. Jon on the ball as usual! Edited By Worden on 31/10/2016 11:07:11
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Chris I don't think you need worry about the strength of your spar or wing as you intend to build it. I used a very similar construction on my Gentle Giant and although it was designed as a slow flier and never intended for any aerobatics it was 16ft wingspan. Same 6mm Depron spar capped with 6mm square balsa and 3mm webs either side except around the dihedral brace where the webs were balsa. The only covering over the 3mm Depron skin was film around the brace area. The completed wing with 2 full size servos and lengthy extension leads was under 2 1/2 Kg. There are some photos in one of my albums or thread here 16ft Depron Wing Worden
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In my opinion for the average installation it makes little difference which way up you put the eyelets, it's far more important to ensure a small gap all around the servo so it can float in the rubbers without touching bearers or tray. I know the current trend is to put the sharp end of the eyelet upwards against the screw head but for the rubbers to work properly the eyelet should be fixed rigid and there is more chance of this happening with the sharp end of the eyelet cutting into the bearer or tray. Some eyelets are very soft and tightening a screw head down onto the sharp end will burr them over and squash the rubber thus defeating the object. Each to their own!
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Hi Broken Prop, sorry for the delay in replying. I did use a slow flying, high lift section (naca 4418) but amended it slightly to a flat bottom for ease of construction. I'm most certainly no expert on that sort of thing but it more than achieved what I was after. Once familiar with the way it handled I found I could fly it even slower, this probably shows in the second video (Spice Cat's) where we also took it up to height and cut the motor to try the glide. Good thing there were no thermals around as I suspect it would have rapidly disappeared upwards!
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Thank you very much for the comments chaps, I must admit to being very pleased with the way it went. Jack we did attempt a landing on the dolly, you can just see in the video the plane was a couple of feet high of target!
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Flintstones style dolly made from a fish box and wheels from the foam cut out of the fuselage, worked surprisingly well. Thanks for the video Spice Cat! Edited By Worden on 21/08/2016 21:52:52
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Hi Simon, the intention of the project was to build a big plane that would fly as slow as possible, any aerobatics were never an option so lightness took priority over strength wherever possible. Surprisingly enough the wing loading turned out exactly on my target of 6 oz per sq ft which is about the same as the MFK Falken build. The AUW was 6kg, the wing being 2.5kg of that. (Apologies for mixing metric and imperial but kg per sq m or whatever doesn't mean much to me yet.) Spice Cat, installation of a 2.4m building board necessitated creation of a walkway around the bench but please don't be concerned as normal service has already been resumed!
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Thank you Ken, praise from the "pushing the boundaries dept." is truly an honour! Simon, the 2 wing halves were fully sheeted in 3mm Depron. I did work out the weight of this against film covering but the difference was actually quite small and I thought the added strength wouldn't hurt. I did cover the Depron skin with film around the centre sections where the dihedral brace was positioned. I have done a quick sketch of the leading edge construction, the hatching shows U sections from 6mm Depron glued up before fitting between the ribs, you can see these in the photo. Turned out to be pretty strong.
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Thanks very much for the comments, I was quite surprised just how well it flew for a rather unusual design. I couldn't find any examples of Depron wing construction of similar size so the airfoil and main spar were a bit of a guess. To keep the spar weight as low as possible I ended up with 6mm Depron between 6mm square balsa strip top and bottom. I added 3mm Depron webbing substituting balsa around the dihedral brace. The only other wood in the wing was a half inch balsa trailing edge strip between the 3mm Depron skin and an eighth strip on the outer leading edge. I did take a few photos as I went along for anyone interested.
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