Ron Gray Posted April 4, 2023 Author Share Posted April 4, 2023 Another use for a Hanky - Hanky the Scarecrow Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted April 5, 2023 Share Posted April 5, 2023 Looks like he's practicing for the DLG competition - I'm sure he'll get disqualified...... Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 5, 2023 Author Share Posted April 5, 2023 Well it could be a good way to launch the Hanky, to get an advantage in the Viagra Challenge maybe? Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted April 5, 2023 Share Posted April 5, 2023 Certainly test the structural integrity..... I was going to say stiffness..... Quote Link to comment Share on other sites More sharing options...
Steven Hurd Posted April 7, 2023 Share Posted April 7, 2023 Ron When you make the 3d printed parts for the battery tray, how thick do you make it, and what density of infill do you use, I was thinking of about 25% infill, and maybe 1.5mm thick so as to not add too much weight, but would appreciate your input. Thanks Steve Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 7, 2023 Author Share Posted April 7, 2023 (edited) Hi Steve I made mine 3mm thick with 20% infill. On my new fuselage I've laser cut a tray from 1.8mm ply, it was quicker than 3D printing a new one and because I could, I made it run from F2 to F3 in one piece! Edited April 7, 2023 by Ron Gray Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 17, 2023 Author Share Posted April 17, 2023 (edited) Well what a day, the sun shone the wind was next to non existence and we had tremendous fun. 12 Hankies were present on the day with another 8 either not able to make it or not quite finished. Better photos will be updated when they have been collected from the various photographers! Not all Wacky Races rounds were carried out as members were flying other models plus, for many, this was the opportunity to maiden / fine tune. I did find that a lot were flying with a too reward COG which made the HP very twitchy but with it moved forwards they became much easier to fly. Anyway, here is the leader board as it currently stands and you can go to my club's website for more photos and news BMFC Edited April 17, 2023 by Ron Gray 1 Quote Link to comment Share on other sites More sharing options...
Steven Hurd Posted April 20, 2023 Share Posted April 20, 2023 Ron Looks like a great day out, with fun for all who took part. Well done organising that. Can I ask what prop you are using on the foam version?. my setup will be. overlander 2830 1300kv 3s 1300 30a esc. Thanks Steve Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 20, 2023 Author Share Posted April 20, 2023 (edited) Hi Steve It was a right good larf. One of the rounds is now going to be changed, the ‘Stick it in’ was nearest to the mark based on first point of contact but after discussions I’ve decided to change that so it is from where the model finishes up. As a consequence this round is to be known as ‘Skid marks’. We are mostly using 8x6 APC but one guy has got a folding jobby on his. It certainly (in some way a bit of a contradiction) helped in the Viagra Challenge as he kept it up for the longest, unfortunately, despite his obvious stamina, he was somewhat wide of the mark on his approach so was disqualified. Edited April 20, 2023 by Ron Gray Quote Link to comment Share on other sites More sharing options...
Steven Hurd Posted April 21, 2023 Share Posted April 21, 2023 Ron A big thanks to you for answering my questions in regards to building this model. Your help was appreciated. It was my first go at foam models and although I’m ok with balsa, the material was unfamiliar and left me scratching my head a few times. I guess when I got stuck in I realised that the best way was to treat it like balsa wherever you can, and adopt knew techniques when you need them. however it does produce a useable model, and mine will get a maiden when the weather gets a bit better. my setup is overlander 2830 1300kv apc 8x6 electric 1300 3s 30 a esc. However my wattmeter seems to say that I’m pulling about 260w, wot. Has your motor stood up to this in normal flying or should I downsize the prop to say an 8x4. I’m looking forward to a change in the weather, when I’ll have a go at that competition called the skid mark Thanks Steve Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 21, 2023 Author Share Posted April 21, 2023 That looks superb Steve, well done (I’ve rotated the image to save my straining my neck!) Your approach to building it was spot on, building in Depron or foam board puts people off but it is really very simple! The motor/prop/esc setup you’ve got is fine, all 12 Hankies flown last Sunday had the same configuration and no one experienced any issues with overheating etc, just be warned on WOT it is quick! Another thing to make sure of, elevator only needs a max of 8mm up and down, in fact I’ve dialled mine down to 5mm and make sure your COG is not behind the spar, in fact move the battery so that it is 10mm in front of the spar for your first flight. A lot of my guys commented on how twitchy it was but as soon as they moved the COG forwards it became a much easier beast to fly. The Skid Marks round of the Wacky Races will be a lot easier if the grass is slightly wet! I was hoping that other clubs would get involved and run their own Wacky Races with the Hankies (built to my specifications of course!) and then I could have a leader board for the whole country, well maybe next year (different model!). Quote Link to comment Share on other sites More sharing options...
Steven Hurd Posted April 23, 2023 Share Posted April 23, 2023 The maiden was a success, but I can say the model can get away from you very quickly., Nice chuck on the car fly anywhere model. And great value for money. Steve Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 23, 2023 Author Share Posted April 23, 2023 Great that you had success Steve, it really is a superb little 'plane but as you found out, take your eyes off it for a second and it's gone. Quote Link to comment Share on other sites More sharing options...
Steven Hurd Posted April 23, 2023 Share Posted April 23, 2023 Ron, Can I ask about the alternative wing and how that is constructed. Also, hen it’s built do you then use the covering material across the step to the trailing edge to form a wing section or is the step part of the aerodynamics. Thanks steve Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 23, 2023 Author Share Posted April 23, 2023 (edited) The KFm-2 wing is built to create a step in the top surface of the wing with the step at 50% chord and an airfoil shape formed on the top, front piece: Now with the swept back LE of the HP I decided that I would form the step just behind the spar on the foam wing as I wanted to enclose the wing servos but I suggested to others to form it on the spar line and that works fine. So to construct the wing I used a full wing sheet of 6mm Depron and then glued another piece on top of that finishing at the line the spar, then stuck the spar on. This is the extra bit of Depron to bury the servos Then stuck on the bottom sheet Wing covered with covering film End view showing the step Not my finest covering job but I didn't want to spend too long on it as I wanted to prove (to myself) that I could build and finish it in under an hour! Things to note. I didn't form a nice curved top airfoil shape to the front section as per pukka KFm-2. Covering film to the top was done in 2 pieces, 1 piece from the TE to the step, 2nd piece from the LE down over the step. Aileron hinge formed with Blenderm top and bottom. Flight characteristics, seems to be more planted in normal flight, bank and yank turns are rock solid. Sinks a lot more on glide. Doesn't spin as well as traditional airfoil. In short, it's a brilliant, quick to build option! As an aside, @Kevin Fairgrieve is building another (balsa) Hanky and he is using the KFm-3 airfoil section which has 2 steps down on the top, so it will be interesting to see how that one goes. Edited April 23, 2023 by Ron Gray Quote Link to comment Share on other sites More sharing options...
Kevin Fairgrieve Posted April 24, 2023 Share Posted April 24, 2023 8 hours ago, Ron Gray said: The KFm-2 wing is built to create a step in the top surface of the wing with the step at 50% chord and an airfoil shape formed on the top, front piece: Now with the swept back LE of the HP I decided that I would form the step just behind the spar on the foam wing as I wanted to enclose the wing servos but I suggested to others to form it on the spar line and that works fine. So to construct the wing I used a full wing sheet of 6mm Depron and then glued another piece on top of that finishing at the line the spar, then stuck the spar on. This is the extra bit of Depron to bury the servos Then stuck on the bottom sheet Wing covered with covering film End view showing the step Not my finest covering job but I didn't want to spend too long on it as I wanted to prove (to myself) that I could build and finish it in under an hour! Things to note. I didn't form a nice curved top airfoil shape to the front section as per pukka KFm-2. Covering film to the top was done in 2 pieces, 1 piece from the TE to the step, 2nd piece from the LE down over the step. Aileron hinge formed with Blenderm top and bottom. Flight characteristics, seems to be more planted in normal flight, bank and yank turns are rock solid. Sinks a lot more on glide. Doesn't spin as well as traditional airfoil. In short, it's a brilliant, quick to build option! As an aside, @Kevin Fairgrieve is building another (balsa) Hanky and he is using the KFm-3 airfoil section which has 2 steps down on the top, so it will be interesting to see how that one goes. And like @Ron Grayhas done I have modified the KFm-3 to partially hide the servo`s. I guess my steps are at about 50% and 60@ of chord. In retrospect I should have gone with 75% as it would have completely swallowed the servo`s and looked nicer. We shall see. Quote Link to comment Share on other sites More sharing options...
Steven Hurd Posted April 24, 2023 Share Posted April 24, 2023 Thanks Ron and Kevin. I will be building that wing next, it looks an easy wing to construct, and cover. Steve Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted April 27, 2023 Author Share Posted April 27, 2023 Some more photos of our inaugural Wacky Races The gathering Pilot’s briefing The start of the Viagra Challenge Start of the Stick it in (now called Skid Marks) Launch techniques Oh dear Quote Link to comment Share on other sites More sharing options...
Kevin Fairgrieve Posted May 1, 2023 Share Posted May 1, 2023 Hanky Planky part deux. My balsa interpretation with a kinda KFM3 2 Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted May 1, 2023 Author Share Posted May 1, 2023 Very nice Kev, weight? Quote Link to comment Share on other sites More sharing options...
Kevin Fairgrieve Posted May 1, 2023 Share Posted May 1, 2023 10 minutes ago, Ron Gray said: Very nice Kev, weight? 620grams, but may need a small amount of church roof. Will do final CofG once the prop arrives. Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted May 1, 2023 Author Share Posted May 1, 2023 That's not bad at all considering you were concerned about the weight. Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted May 15, 2023 Author Share Posted May 15, 2023 (edited) Latest round of the Wacky Races was held in conjunction with the WRA and great fun was had by all. Here is the updated leader board (photos to follow). Edited May 15, 2023 by Ron Gray Quote Link to comment Share on other sites More sharing options...
Graham Bowers Posted May 15, 2023 Share Posted May 15, 2023 On 01/05/2023 at 09:36, Kevin Fairgrieve said: Hanky Planky part deux. My balsa interpretation with a kinda KFM3 Has the KFM3 maidened yet please, and if so, I'm intrigued to know how it performed? Quote Link to comment Share on other sites More sharing options...
Kevin Fairgrieve Posted May 15, 2023 Share Posted May 15, 2023 35 minutes ago, Graham Bowers said: Has the KFM3 maidened yet please, and if so, I'm intrigued to know how it performed? I maidened it on the morning of the latest Wacky Races. It fly`s like my foam planky. Not a lot of difference to be honest. I did however elect to use the Depron one for the races. Quote Link to comment Share on other sites More sharing options...
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