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Nik Harrison

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Nik Harrison last won the day on September 20 2021

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About Nik Harrison

  • Birthday 14/12/1949

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  1. Geoff, Why do you switch your router off overnight?
  2. Thank you for this posting. I was trying to do the same with no joy. It does work but older pictures give Error 502 and comment saying "try later". Still better than nothing. I was look as far back as 2003. Cheers.
  3. Martin, Thank you for the clarification on the noise test parameters. We will take it into account at our club. Our 80dBA limit is a result of a council imposed limit and we do our best to ensure we get no complaints. GrumpyGnome will be pleased to hear we have been following the BMFA guidelines on how to do the noise test with a calibrated noise meter, but that guidance was not safe when testing larger multi-engined models hence my query. Thanks for all the replies. Nik
  4. Thanks for all the replies. I would have to say that given that the replies were "opinions" it seems that nobody was able quote a definitive BMFA method for the larger models. I agree that the views expressed are all very sensible and no doubt that is how we will proceed. Our site has a 80dBA limit which does not help. Maybe it's about time the BMFA did have a definitive method for larger models. Just a thought!
  5. I would like suggestions and/or approved method of noise testing larger models. The model in question is a B-25 with 2x22cc petrol engines, span 2.5m and weight around 10Kg. By modern standards this is not a particularly large model but it does mean the simple "hold it up on WOT" is a bit optimistic. Any suggestions welcome.
  6. You have initiated an interesting thread, but I come back to your original comment. If your choice of radio system is the colour of the Tx why are you even bothered about its functionality. You seem to have radio gear that is already full filling your requirements.
  7. Grude, Here is the info. Hope this gets you sorted, if not then come back to me. Cheers, How to Program.pdf
  8. Grude, No problem. I will have to dig out the info, but I did write it all down as I knew I would forget it. Will reply later with the details. Cheers, Nik
  9. Tony, From your last post with two motors connected but only second motor running. This would indicate to me that the signal from the Rx could be too low in volts to drive both ESCs. It works on the first ESC but when connected to the second ESC at same time only the second ESC responds. Could you try substituting the Rx with the servo tester. This will, hopefully, give a better voltage signal to enable both ESCs to be driven at the same time. I have had to use a signal booster on my Spektrum Rx to enable 4 ESCs to be driven successfully. First 4 ESC model I made was no problem, but the second one I made with different ESCs using same Rx would only drive two at a time. All ESCs are not created equal.
  10. Martin, The point I was making about an ESC failure is that when they fail they tend to go up in smoke. The result is no 5v to the Rx - result is crash. An ESC is more likely to go up in smoke than a UBEC as the currents in evolved are so much higher in an ESC. Potential solution is to use the 5V supplies from all four ESCs, via Schottky diodes (minimum voltage drop) to ensure isolation between ESCs.
  11. Tony, I remember this problem when you posted before. The advice at the time was to breakdown the problem into simpler parts. That is use a servo tester to make sure each ESC/motor combination works individually and work up from there. Motors in pairs then two motor pairs to get your four motors running. Small steps will lead to the correct solution. There is one point that you seem to miss in that you wanted redundancy but you are only powering the Rx from one ESC. If that goes then so does the plane. It does not matter what the other battery is doing. I would feel happier with a UBEC. You have supplied a drawing of your wiring, but can you be sure that is how it is actually wired? If you build up your system in small steps than you can be sure what works and what doesn't. Circuits that may help are on 4-Max website to assist in multi engine wiring. Hope this helps, Nik
  12. I agree. Organisers should be taken to task.
  13. For the third time, over some time, I have been asked to get a new password as my present password is not recognised. The problem is I have not forgotten my password but the site will not let me log on. Creating a "new" password seems to correct the problem, but it the problem does seem to reappear sometime later. Why? I use a password manager to ensure that passwords are correct. I'm using Safari on an MacBook with a VPN. Switching off the VPN makes no difference. Once I thought fair enough, but it keeps continuing. Please explain why.
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