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Simon Chaddock

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Everything posted by Simon Chaddock

  1. FlyinFlynn You could try multiple "spars" like this. All sheet foam but the principle is the same. Actually only one spar as such the others are technically shear webs. All cut from the same 3mm sheet foam as the wing skins. Easy to do if you have a root and tip profile. Select where each "spar" will go, reduce for the skin thickness and it is just a straight taper between root and tip. In this case I had the root & tip wing section of the full size plane and just copied it. The ultimate true scale!
  2. toto I would certainly go tomorrow if you possibly can as it looks like it should be dry with a gentle wind for the first time in weeks but by the weekend there is some serious Atlantic wet weather due.
  3. Toto The real test comes when you can fly the same way with the "stab" on or off. Then whether you use it is entirely up to you, except of course when doing a formal flying test. 😉
  4. Frank You are quite right about the time required. I am retired so within reason time is not really an issue. Of course the danger is you simply build too many planes.
  5. "...until one of the big boys bring out a edf foamie, hopefully Xfly." It is possible to build a foamie yourself. The construction method is not that different to the TN one just substitute 3mm foam sheet for the balsa. It ends up a lot lighter as the foam is about 1/3 the weight. This means it only needs a single 3000mAh 2s to drive four 40mm EDFs so everything is very scale. Without UC it is light enough to be easily hand launched. Incidentally I not only practice gliding my EDFs but frequently land them that way too. As long as you keep high enough towards the end of the expected battery limit the LVC holds no worries.
  6. Actually there would be nothing new to model. From what I understand the deliveries were made using standard 45 gallon drop tanks, duly washed out of course.
  7. My only concern would be the condition of the stick pots. Being 'mechanical' the do wear over time although I accept that Futaba bits tend to be pretty "bullet prof" The pots on my 6 channel Futaba Skysport 6A, still being used on 35 meg, have outlasted those on my old but considerably younger Spektrum DX6i.
  8. Toto Don't treat a crash as a 'walk of shame' but more a 'badge of honour'. You have joined the club. We have all crashed. The important aspect is to work out truthfully why it happened so you can take action to avoid it happening again. The old saying is "If you haven't crashed then you are not trying hard enough" and that applies to building planes as well as flying them.
  9. David It may need some thought. The Baron wing is a constant chord plank with a moderately high aspect ratio. The Spitfire elliptical wing is a much better structural shape. As suggested the only way is to try and see using spar(s) similar to your current wing design. Nothing ventured nothing gained
  10. If you carpentry skills are up to it a scarf joint is as strong as the original. Cut each along the red straight lines shown. Make two balsa inserts using balsa of the same thickness as the original that exactly fits the joint lines you have cut. Glue in place weighted down until the glue is hard to ensure the tail plane is flat. Use the same glue as was used to construct the tail plane. If you fly model planes repairing a balsa structure is a useful skill to get good at.😉
  11. Impressive A very good example of "with enough power fancy aerodynamics are not required"
  12. That was exactly my thinking. Is it just the same motor or can it be either? If its always the same motor then its ESC is suspect. If it can be either motor then its ESC must be getting a signal. An ESC signal is exactly the same as for a servo so it seems that somehow the elevator or aileron signal is briefly getting to the ESCs. If you disconnect the Elevator and aileron servos from the Rx does it still happen? If it does it would suggest the fault is in the Tx or Rx not the wiring to the servos Having shown it is not the Tx or Rx If you disconnect the signal wires to each motor in turn. If they do not turn under the same test circumstances then it proves there must be a wayward signal getting to the motor's ESC. This would suggest there is some interference going on between the servo wires. This could require some careful inspection to ensure aileron servo wires and ESC wires are not running in close proximity. This sort of condition is more likely with wing mounted motors. Undertaking specific tests to logically eliminate each possible failure mode is about all you can do.
  13. The HS 654 MG servo matches the servo spec for the plane. Do you know the type/maker of the servos that failed? If the failed servos actually matched the spec it could indicate that something else is wrong particularly if they both failed at the same time.
  14. I think you will find the covering goes "soft" in the sun. Unless the original shrinking was absolutely uniform over the area then any softening results in wrinkles. Depends on the covering it may recover when it cools once out of the sun. Some coverings have a once only shrinkage some need an even higher temperature to shrink any further.
  15. David Perhaps the thing to remember is that a Depron wing on its own is unlikely to be as strong and crash resistant as a conventional as balsa one as by volume Depron is at least 5 times lighter than balsa. Thin foam sheet can be used as a skin provided the structure within is suitable for the purpose. Being so light a Depron skin can be much thicker which can have advantages in both providing a smooth profile and for physical handling but be aware many foams do not like methanol or petrol. On the plus side Depron is much cheaper than balsa and is easier to repair. Using Depron comes down to a choice between the benefits and disadvantages for each particular application. Foam as a constructional material really comes into its own when its benefit of light weight is used in the appropriate areas of the whole airframe rather than just say a wing. Light weight reduces the power to fly, reduces airspeed and thus the energy of any impact.
  16. smithy8 Sorry to be negative but be aware there are now legally enforceable rules about what, where and who can fly a radio controlled hobby "aerial vehicle" be it a model plane, helicopter or quad. This is the reasoning behind the suggestions to visit the British Model Flying Association (BMFA) web side and visiting a model flying club where you can see and talk to people who actually do it. An 80mm EDF Rafale is going to be powerful and heavy. It is not a "toy" and could be considered dangerous in inexperienced hands. Most definitely not a plane for a beginner.
  17. My working planes "wall hang". The non operational are in the roof which by the way I personally insulated and boarded out. Interesting my contribution of old airframes only occupies a tiny proportion of what's up there! There are two more full walls. 😁 The original intention was that each could be unhooked and flown at a moments notice. Now "double stacking" means others may have to be moved first. All foam and scratch built apart from the LIDL and Cheetah chuck glider conversions. All the scale types should be recognisable except perhaps for the silver and red one! Thank goodness for a high Victorian ceiling and a picture rail.😉
  18. Toto A balancing board is "dumb". It does not know which battery on the board is taking what. As GrumpyGnome points out it is wise to only use a board on identical batteries that are roughly at the same level of charge. This will mean the total input charge will be spread more or less equally between the batteries. Note the batteries MUST be of the same capacity, cell count and ideally C rating If for example on the board you had one battery virtually full and another virtually empty it is quite possible that the act of simply by connecting the batteries to the board for the full one to charge the empty one at a high rate until the voltage of the two batteries equalise. It will happen quite quickly but even a short duration massive charge will not do the receiving LiPo any good. Obviously a dual charger treats each LiPo completely independently so effectively there is no electrical connection between the batteries. A battery board really only makes sense if you have a number of identical batteries that are all discharged in a similar way.
  19. Toto The question is what voltage is abnormal. For most charger it would be the battery or an individual cell voltage. Unlikely to be a supply side problem. As suggested the charger may have a cell voltage deviation limit on the basis if one cell deviates too far from the others it is an indication there is something wrong, however a faulty balance lead connection would have the same effect as a faulty cell. The fact switching off and on clears the fault does rather suggest a software issue or perhaps by the time the power is restored the suspect cell has recovered to be within the chargers cell deviation limit. Does the manual have a list of the displayed fault messages? Hopefully it will also have a description of what each fault message relates to.
  20. This was a 23 winter build and also was not taken to the cancelled DVMFC open day! A DH Venom of the Swiss Airforce aerobatic team. They built Venoms under licence and used them right up to the mid 1980s. Less the tip tanks it has a 1120mm span (44") uses a 50 mm EDF with a LW-PLA printed inlet duct. The exhaust nozzle is PLA printed. With such a relatively short duct little of the EDF thrust is lost. On a 1400mAh 4s it has almost too much performance. As a grass belly lander it is flown without the LW-PLA printed tip tanks.
  21. There is also this video of Ray Hanna flying his favourite Spitfire. Apparently Ray did a pass but the producer asked him if he could do another a bit lower. Unwise to ask Mr Hanna to go lower! https://www.youtube.com/watch?v=4iOoiEbtf2w
  22. Following my usual super light foam build this is the Folland Gnat I was going to take to the DVMFC before it was cancelled. Built almost exclusively from 2mm Depron it is terrifyingly light so only needs a 3s 1500mAh for its 50 mm EDF. I installed a rate gyro for its maiden as I was not sure how it would fly, The gyro is still there. With the wing removed, it is held on by 4 nylon bolts, shows the printed duct. The EDF is right at the tail. The canopy is the battery hatch. The elevators look small but I later discovered that they are actually just the trim tabs for the all flying tail plane. The Gnat did not have duplicate hydraulic systems so in the event of a hydraulic system failure there was a mechanism whereby the stick could be linked directly to the trim tabs. My Gnat is thus flies in hydraulic failure mode! With this limitation it is surprising the Red Arrows flew the Gant as long as they did. A remarkable video of the late Ray Hanna doing some low level "terrain following" in a Red Arrows Gnat. https://www.youtube.com/watch?v=ljofhhdDGPo He was a bit of a low level expert. The music is not bad either.😉
  23. Toto High pressure = more settled conditions should be here by next Sunday.
  24. I find it slightly surprising that in this whole thread there appears to be no mention of aileron differential to limit the effect of aileron adverse yaw. On a big span glider aileron differential can be quite effective however it rarely can be 'absolute' so the rudder is still required with bigger aileron inputs. Aileron differential can make holding a thermal that bit easier. I tend to add mechanical aileron differential as a matter of course to all my light slow flying planes primarily as it allows safer full aileron inputs to combat turbulence when close to the ground. It is not unknown for a big aileron input to "level the wings" during the final turn to promote an incipient spin. 😉
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