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John Roberts 9

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  1. Has anyone returned their low thrust FMS units to George at 4-Max for testing? He seems to generally have a good reputation in the model flying community and I feel certain that he would want to assist in identifying the problem especially if there is a 'rogue' batch of dodgy or mislabelled FMS units in circulation. I know this won't be of any use to those who purchased direct from Banggood etc. but certainly worth a try for those who bought from 4-Max
  2. The problem certainly sound like a low thrust issue. Although my model is a Gnat it flies well and doesn't need an especially energetic launch to get it away easily. Full throttle and a firm 'push' and it is away with a nice, gentle, controlled climb out. With a 2150 3S Opti-Power LIPO (35C continuous rating) installed the model weighs 615 grams and, using the 'kitchen scale' test produces around 580 grams of thrust. Fan and ESC both came from 4-Max. I also enlarged the 'cheat hole' by about 20% (pretty much as big as it could go) to help the fan 'breathe'. One final thought occurs to me...……...have you 'trained' the ESC to recognise the correct full throttle point? If not then you might be a long way short of full power even with the Rx stick pushed fully forward
  3. I also had a successful maiden with mine a couple of days back. Initially the model displayed pronounced 'Jeremy Corbynism' (leaning strongly to the left!) but a few correcting trim clicks soon resolved that issue. I have left the aileron deflection at the recommended 3mm with plenty of expo (45% on Spektrum) which keeps the changes of direction smooth, flowing and twitch free. As for elevator I settled on 8mm up and 6mm down with 30% expo. Model glides nicely making landing a breeze. Thanks to my friend and clubmate Richard for the photos.
  4. Finally finished my Folland Gnat. Took me rather longer to build than I expected but, on the other hand, I haven't had much else to do over the last few weeks! Applying the covering was a bit of a fiddle but it doesn't look too bad as long as you don't look closely! Scottish lockdown rules have just been relaxed so I hope to start flying again tomorrow but I shall give my rusty thumbs some exercise on my trusty Wot4 before trying to maiden the Gnat. Edited By John Roberts 9 on 28/05/2020 17:18:27 Edited By John Roberts 9 on 28/05/2020 17:45:49
  5. Hi Lucas, Great repair job. What happened on 23/5 is now just a bad dream!
  6. Awww Lucas, what a shame. I think we all share your pain! After a crash my first thoughts are to chuck the remains in the bin but I know to resist that urge because a couple of days later I always find myself figuring out how best to execute a repair. With your building skills it will soon be back in the air. By the sounds of it the main learning point from all this is that the Gnat needs more elevator movement than the recommended 6mm? My build is close to completion and, with a relaxation in Scotlands lockdown rules now imminent, my maiden flight isn't far off (hopefully!). All the best with your repair.
  7. Hi Martin, Thanks for the recommendation. I have a bottle of canopy glue in my stock and whilst I have found that it works well in some situations it can also be a bit messy, especially where the canopy isn't very rigid and/or where the fuselage has compound curves (like the gnat). Could be that I am just ham-fisted of course! Just a few minutes ago I was looking at a piece of depron and wondering if I could use it to make a base for the canopy which would stiffen the whole thing up. Then again I am probably over-thinking and over-complicating.
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