Jump to content

Erfolg

Members
  • Posts

    13,972
  • Joined

  • Last visited

  • Days Won

    1

Erfolg last won the day on November 7 2021

Erfolg had the most liked content!

1 Follower

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

Erfolg's Achievements

161

Reputation

  1. I have tried the various types of PVA I have, non have worked. Strangely Cyno has not worked either. All were tested on scraps of the off-cuts from the canopy. Mt previous canopy Glue was sold/made by 5 Star adhesives of Runcorn now departed to Rumania I believe. Seems I will have to bite the bullet and buy on line. The irony for me is that most, if not all glues, paints etc are often repackaged commercial, mainstream products. With the decline in LMS I rely more frequently on the main street.
  2. I am at a point in a model build I need to attach a canopy (transparent type) to a model. I am now out of specific "Canopy Glue". I have no local MS, which means purchasing on line from a MS, I would pay pretty much in P&P, as the glue ,on that basis I am very reluctant to go that route. Are there any high street Adhesives that can be successfully used, say from Toolstation, Screwfix or B&Q. I have two types of Gorilla glue, Cyno and ordinary PVA. These all seem unsuitable. Any Ideas
  3. I thought the fuz was Algebra like, although, apparently it is not. I have also motorised my Algebra, with a Selig section, I think my model is 100" like. I do not fly it mainly as the air brakes were, are operated via a fuz located servo via fishing trace wire. From time to time I have considered putting 9g servos in the wing, then I find a whole set of reasons or difficulties, when I give up. The weather and the farm track are against me, up here in the North. It has been very wet here, even when not apparently raining. The two Links golf courses are open, the two soil Golf courses are posting closed, not partially open, winter tyres or some holes closed. It could realy be that, now, in my dotage, I am a wimp?
  4. There used or still is a young female member of the Ashby family who would resolve any internal issue of this nature. I have not been able to find the thread that she administered. I seem to remember that she had a child, if so, she probably no longer has the time, or maybe inclination. To complicate the situation, the postal service is not what it was in the UK, it still seems to be in the 20th century, moving into the 21st at the pace of a snail or a racing tortoise. I am sure that in Spain it is very different.
  5. I have not received a February mag. It will be January tomorrow. I normally receive the mag mid month, dated for the following month. I have checked that my subscription has been made, in our bank statements. Can some one help?
  6. There is a thread "3d printers recommended", at present it seems at present to be discussing a very narrow area. Knowing very little about ranges or models of 3d printers, nor what modelling and slicing applications are available an article would be of interest to me. I expect that many other modellers are in a similar position, although many modellers now use 3d printers in the hobby.
  7. At the moment I have no intention of changing from my current 3d printer. However, knowing next to nothing about what is out there, or the limitations and restrictions, I would like to have a better knowledge. I get the impression that at one of the capabilities of the Bambu, is that it can print using multiple colours during a single print. However their appears to be some restrictions, from what has been written, which I do not yet understand. For example, I use "Fusion" for design (a wide spread programme used in industry) and "Ultimaker" for slicing. Are there restrictions in these areas? If not, what in simple terms what is the real or perceived restrictions.
  8. I am coming towards the end of the build. I have a number of questions with respect to where have others placed the elevator servo. I dislike bowden cable, the one I have is pants, the better ribbed type inner, are now ridiculously, wallet busting expensive. I have been considering close located, push rod location. Also wire trace push pull system, located very far forward, although the 90g servos output shaft run in the plastic case. How have others attached the inlet and outlet formers. Are they stuck to the balsa middle bit, or attached with screws. I have now set the model up all the equipment and dummy Lipo to access the Cg movement with various layouts. It moves about 12mm.
  9. Erfolg

    Winglets

    Going back to part of the original discussion, from memory, it was accommodating the first Jumbo, that was part of the initiator of the benefits of winglets. The Jumbo could not initially fly into many majorish airports due to restrictions at gates, taxi ways in addition to hanger issues (maintenance etc). Winglets were postulated as a way of effectively increasing the effective span, to within an agreed desirable future limit on span. The fashion comment set me thinking. I also thought is as much influenced by the status quo, and expectations. Like many on this site including Dave Burton (Biggles) my studies covered 7 years. On that basis placing much accurately on the time line is questionable. Many of the lecturers in this region (probably else where) were from the aerospace industry, as Duncan Sandy reorganised the companies. Then we had Avro, Fairies, Hawkers, English Electric and many sub contractors Metro-vics, Ferranti. In this case it was a throw away comment from a lecturer, for interceptor aircraft, that low aspect ratio wings , that were in essence trapezoidal or delta were far superior to elliptical planforms. The structural and roll initial issues were far more important than tip losses, at low angle of attack, and that dog fighting was in the past. At the time not what most people expected. End plates were mentioned in some context, dismissed in most cases, as increasing drag. Yet a few years later I took an exam paper that one question was all about an inverted wing, on a strut, from memory about the forces seen by the strut, from a vehicle at a particular speed. Then these wings in the real world ha end plates. Now the end plate has replaced the strut, for a variety of practical, and regulation reasons The answer of the evolution of winglets, is not as straight forward as most tend to believe, nor probably how and when they work, dependant what the designer and more importantly the user (customer) wants. Like many I have seen things come and go out of fashion, such as Coefficient of drag in advertising. Cars now tend not to do 70 with wind noise being an issue, or front end lift, or cross winds being noticeable. Yet the Audi TT needed a spoiler to prevent rear end instability. Just goes to show, you never can tell.
  10. Much to my surprise, in the recent past I have purchased Birch Type ply from "Hobby World", you know the one, stocks stuff for kids, various niche (is that us) hobbyist. Does not claim to be Birch, it is the look and feel, that suggests to your experience, this is not light ply. I think my stuff is 3/8" thick, although i think 1/4 " was also available. Pricy for a small amount, but then again cheap, compared to a sheet of the stuff. Unlike a few, I think that light ply is great, not great for firewalls, great for light structural members, mid-way between balsa an birch types. Helps in managing wight
  11. Erfolg

    Winglets

    Off course winglets work, otherwise we would never see them on full size commercial aircraft. Then again we never seem to see them on military fighter types. I ask my self, how could both be valid? I Guess it is due to commercial aircraft essentially traveling within a narrow speed range, in a straight line. Could this also be true of full size gliders between thermals. in a thermal, perhaps not working effectively is not the most important aspect?
  12. I have a old Micro Mould Bowden Cable, unfortunately It appears to have stickchen, in that the friction is higher than I would like. I feel that this would result in hysteresis on the elevator, on a non consistent return to the central position. Any ideas of a solution, say a lubricant?
  13. The book ""Valkyrie the North American XB-70 by Graham M Simons, pub Pen & sword aviation, isbn 184884546-4, on page 141 has a picture immediately prior to the demise 62-0207, has an under surface picture in flight. It shows aa series of what appears to be holes prior to the engines. Super Cruise equipment is not directly mentioned, as on Concord, I guess it was perceived as a bit of an area of secrecy. Indirectly discussing the system, mainly from the perspective, is it visible. Air was slowed from Mach 3 to I by a series of adjustable internal ramps, plus exhaust doors in the upper surface of the wing immediately Infront of the Engines (to avoid using after-burners, all of the time). Discussed P86-87 amongst other. There seems a number of excuses to have cheat inlets, and still be semi-scale.
  14. Simon, I have argued that fans increase the thrust or force, that is by doing work. You get nothing for free, you have to supply energy, the resulting effective work done, depends on various factors. My only issues are that ducts absorb energy, supplying air from just Infront of the fan, should be more efficient, than a long duct. I see that you stick to your principles of minimal build weight, to allow lower flight speed, at the expense of robustness and potentially robustness. This is what floats your boat, so why not. I just believe in this particular instance you can/could improve the power system, by a few tweaks (I always know all my models could be better in some respect, ahh, hind sight). With gliders in particular that the so called lift, term has a V^2 in the relationship. On that basis once the model is at height, not much more velocity is required to achieve a lift value, that is the same as a lighter model, that makes little or no practical difference to duration or distance, the pilot matters generally more. On this basis many favour a robust model, even if the weight is higher than others favour. Epoxy models will often provide robustness and light weight. Your Philosophy meets your wants and needs. The mainstream DFs, use power at a rate, that normally results in short flight times, often heat issues of various types
  15. Simon We will both agree, that when gliding, lets say a steady state condition, what generally enters the tube is pretty much the same velocity as the model is at. To get thrust we rely on F=Ma, in essence air density is constant (at a particular time), on that basis the thrust, force comes from accelerating the air the fan sees. Gong back, to our youth, when dong fluidics of a multi element pipe system, if we can introduce an additional lower friction/loss common, a low loss source. The calc changes, with potentially higher thrust, as a additional volume of lower loss fluid being available. Without resorting to a few calcs being definitive of the why, cheat holes actually work and can work well. it is a great pity that Dave Burton is not with us, as I strongly believe he would present a better and clearer argument than me. We also know intuitively that DF are less efficiently than a prop, hence the short flight time, particularly if we try to fly fast. In essence we can easily show the relationships between Work Done etc and ducted systems, yet for most people, they just know from observation.
×
×
  • Create New...