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Phil Green

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Phil Green last won the day on January 5

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  1. Surely these are only any use in a straight line? For the bikes, once per second is way too slow, we found 10 samples per second too slow, Even with 100% reception, which we achieved maybe half the time, at 100mph the curves were a series of 15' chords. 🙂
  2. Be aware that gps-based devices are only accurate under saturated conditions, particularly at high speeds. Experiments for our motorcycle racing club showed bikes cutting corners, often jumping across the midfield cutting half a lap, with software straightlining between insufficient datapoints giving wildly inaccurate results. I had plots, I'll see if I can find them.
  3. Frsky X series, so full range. And isnt that the Taranis stick unit?
  4. 😁 I've never seen one before but try here: https://acairtechnology.com/ The tortoise/hare throttle suggests a 'toy' use - and yes, it is quite a "toy" !!!! Must have quite some traction, cant imagine it working on grass. The USB bottom-right could be an Arduino Nano edge-on. Is the case 3D printed maybe? In its intended role it would only need short range so might not make a flying set... although you wouldnt put a full external aerial on a short range device, so ??? Any chance of a look inside Ben? 🙂
  5. 30 seconds initial load, then 30 seconds per click... fibre to premises
  6. I've seen many, many taped-up aerials on Spekkies but never seen the cable snapped like that. To actually sever the cable an awful lot of force has been applied there - way more than the weight of the tx - so I would suggest thoroughly checking that the RF board connector is undamaged and its connections are still mechanically solid 🙂
  7. Matty what can I say so sorry to hear this - hope you're on the way to a full recovery soon Phil
  8. No response for half an hour up here in Ponty, everything else ok, just this site 🙂
  9. 18650 is only a size measurement, LiFePo4 cells are available in 18650 format, a 2S is 7.2v charge, nominal 6.6v, still considered 'HV' but not as 'H' as lion or lipo 🙂
  10. The battery voltage is less important than its ESR which limits the current it can supply, in fact a high-ESR pack can show an artificially high unloaded terminal voltage. For example many of us run flight packs off a single Lithium cell, its a lower voltage than a 4.8v NiMh but has such a low ESR that the terminal voltage is maintained over wild variations in current draw. At the other extreme are those whose solution to a 4.8v pack that drops under load is to add another cell in series. This really is very poor practice, no engineer would fix a current supply and hence a voltage drop problem by raising the voltage, in fact an additional cell increases the already poor ESR by 25% and the % voltage drop for a given current will actually be worse. Power supply problems are best fixed with a low ESR high quality pack, not by upping its voltage in the vain hope that the extra cell will 'fill in the gaps' 👍 [/2p] Cheers Phil
  11. If the voltage measured at any point is varying by half a volt then either the battery has too high an ESR, the wiring isnt heavy enough for the current, or the connectors are resistive. One servo load should barely impact the voltage. Where are you measuring Bas? to measure battery volts under load you need to connect the probes at the battery terminals or a Kelvin connection (ie a separate zero-load connection to the actual terminals), not midway along any wiring - thats a different test, check if the battery is dropping under load first. Lipo balance leads for example are Kelvin connections - the idea is to measure independently of any cable and load losses.
  12. I still use the PulStar amongst others If you can find one, the GWS MT-1 is very good, it does servo testing, reads PWM and PPM, prop RPM, etc
  13. Is it one of these? The 'end-to-end' swing is a feature of these testers, could it be you're accidentally pressing buttons?
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