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MattyB

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Everything posted by MattyB

  1. Got a PM on RCGroups from an HK employee saying they have a new "low cost" option from the the International warehouse. Errr, it's still £41 for a £93 model, and Motion RC do free shipping over 99 Euros (and their models have the VAT removed at source for the UK, though obviously that will be added on by HMRC on import). Back to the drawing board guys!
  2. Is there a reason you continually type Yeti instead of Jeti? Newcomers to the hobby could get confused, it's not terribly helpful...
  3. David, over 10 years ago it seems there were quite a few problems with these servos that were exhibiting exactly the characteristics you have seen... https://www.rcuniverse.com/forum/hitec-multiplex-radios-ask-hitec-customer-service-53/7802446-hs-75bb-retract-servo-failures.html For me I would jsut take it as a sign and replace with somethng else. Whilst historicaly I have been a fan of Hitec servos, in recent years I do feel their lower end servos have been cheapened to compete with low cost models from China, and they seem to have got less robust and reliable as a result. YMMV.
  4. More useful resources on this topic... https://www.finesseplus.org/flying-your-models-in-france-what-you-must-know/ https://www-finesseplus-org.translate.goog/rc-slopes/?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp (click the green "Je suis d'accord" button on entering) https://www.geoportail.gouv.fr/donnees/restrictions-uas-categorie-ouverte-et-aeromodelisme (no translation available)
  5. We have some French members who are well placed to advise, but I suspect you will have difficulty flying legally at such short notice - the French have gone beyond EASA proposals in some areas, requiring model registration (not just pilots) and transponders for models over 800g outside of designated sites in addition to the now standard online competency testing. I would say don't bother this time round, as it's almost certain you would be flying illegally... https://emfu.eu/regulation/implementation/france
  6. OK, it originally read as if you thought telemetry had not been given sufficient R&D before release, but that does make more sense. I agree that the X8R CDI issue was not Frsky's finest hour; it goes alongise the original Redundancy Bus release that featured faulty firmware that did brought down several models initially. It's not an acceptable excuse, but at the time when Frsky brought out the first D16 RXs gas models would have represented a very small part of their target market, so I guess taht specific testing of was skimped on to get it out of the door. This scenario is probably the one instance where having a distributor in the loop would help the consumer, as the message about anyfault will get shared more quickly and effectively with users so a recall can take place. However, given the rate of product development and innovation going on at the likes of Frsky it's probably something that you have to accept if you want to use the challenger brands and take advantage of the "bang-for-buck" that they offer. Look at Ron - yes he lost some expensive models, but the alternatives are so much more expensive (Jeti) or expensive and lack telemetry functionality and integration we are now used to (Futaba) that he's stuck with them even so. At this point I suspect that Futaba is more likely to exit the RC market altogether than invest sufficiently to catch up with Jeti, Frsky and Spektrum, and even if they did lod knows what the new keit would cost. Me? I simply don't every buy any "first batch" brand new Frsky product until it has had some additional field tsting - if after 3 months no issues are reported on RCGroups (here by far the biggest number of Frskyusers post) I'll happily buy one. You may argue I shouldn't nee to do that, but for me it's a minor inconvenience compared to the cost, usability and functionality compromises I'd have to make to go with something like Futaba.
  7. Given this is a brand new TX my priority would be to discount that as a first port of call. Try borrowing a “known good” Frsky D8 RX that you can slide into the model without changing anything else. Range test and (if it passes) fly it see if you get the same behaviour; if it’s fine you can discount the TX, if not then some more detailed ground tests might be in order, or returning the TX for replacement if you don’t want to do that.
  8. If you fly large conventionally constructed models as you do then yes, RX installation is generally not too difficult or critical. However, that isn't the case if you fly composite models, especially if they have tight installs such as on moulded gliders. In this case telemetry is super useful for evaluating your RF setup. Swapping RX packs is often not that easy and we often fly in the cold on the slope, so knowing battery SOC is also extremely useful. Finally RSSI is also brilliant if you land out with a glider and you can't actually see it - just stick in range check mode and use the RSSI to guide you to the model. None of this is distracting either - it jsut sits there doing it's thing unless signal strength or battery voltage gets low for any reason. It is massively useful though - on my Sebart Miss Wind it saved the model, telling me when an ESC BEC had failed and I was running on the backup power in real time. That's a £600+ saving right there in one flight! TBH I don't really understand your final comment about R&D; I have literally never seen anyone having any issue with telemetry beyond getting the TX setup initially to interpret the data, which yes can be a little fiddly the very first time you do it. Certainly my Frsky telemetry is fit and forget after intial sensor discovery, and all the users of Jeti and Spektrum that I know say the same too. Never seen anyone on Futaba using telemetry, but I think I know why that is... £££! OK, but there is a big difference between "Unknown" products and "Unknown to me" products. Whilst I don't disagree that Futaba has a great reputation for reliability so do lots of manufacturers now, and they offer a lot more functionality for less money. Frsky have been available for over 12 years; I have personally been flying them for 10 and have never had an RF failure (one RX did report errant telemetry alarms at medium range in a range test, but was from a known faulty batch and was replaced quibble free by T9 under warranty). From my view there would be more risk to going to Futaba or Spektrum at this point as I couldn't afford to kit all my models out with telemetry as std (all but my tiniest parkflyers are at this point). True, but don't forget by far the dominant reason that brands like Frsky and Radiomaster are cheaper is because they don't do conventional marketing or have a network of distributors all taking their cut. They also haven't had to develop their own transmitter firmware either if they've gone the open sourced (OpenTX/ERSkyTX/EdgeTX) route (though frsky are moving away from this having develped and released their new range based on the ETHOS OS). As a result if you look at the low end TX from Futaba like the 6K and compare it to a similarly priced Frsky QX7 or similar the perceived quality of the case, switches etc seems better to me on the Frsky - put simply a higher percentage of the sticker price is in the physicals of the device. Obviously high end Futabas remain very good in terms of physical quality, but then at those prices they should be - if I was paying that much I'd be going Core or Jeti, as they develop features far more quickly and the software is definitely more flexible. If it had telemetry as std I'd agree, but from what I can see they don't, and telemetry accessories are eywatering - £160 for a vario, no thanks!! I have 4 Frsky varios from memory, all still working (one of them must be ~8 years old), and I doubt they came to £100 in total...
  9. I don't have any Mac knowledge so can't really help further - I suggest you use the relevent RCGroups threads as there will be a lot more experts on this there However, from this thread I found with a quick Google it does seem most likely it's a problem assicated with your version of Mac OS potentially being incompatible with the latest Companion software... https://openrcforums.com/forum/viewtopic.php?t=7690
  10. Key point - I recommend you bookmark and use this thread in RCGroups for EdgeTX questions, the Devs post their regularly and are the best people to help you with this type of issue. I can't help directly with Edge I'm afraid as I haven't yet used it myself (though it is supposed to work I strongly suspect Mac support/troubleshooting will be low down their list of priorities). However, OpenTX Companion downloads are not hard - go to the OpenTX downloads homepage... https://www.open-tx.org/downloads ...click on whichever version you want (most people just go with the latest prod release): ...then scroll to the bottom for the download links:
  11. Yes, previously discussed here too in more than one occasion…
  12. Both Jeti and Frsky have out of the box solutions for resilient RF across 2.4GHz and 800/900MHz; the exact frequency of the latter link varies by geography due to differences in legislation.
  13. All true, but I am sure the car driver is thinking about his excess payment for this and the premium next year if he claims. If I were him and I thought I had some degree of responsibility I'd just pay 50% out of pocket and move on, that is almost certainly going to be the best option unless it's a very, very expensive model. If I thought it was the other blokes fault for placing it in an area members can legitimately park but hidden from view, I'd probably refuse to pay as well - who places expensive models in car park spaces anyway?! The club should just stay neutral, tell the parties to sort it out amicably, and if not apply their constitution as written to discipline/suspend/eject the relevant members once due process has been followed. PS - Any threats of police or legal interventions are completely empty IMO; the former won't be remotely interested and the latter will cost far too much to be viable.
  14. I just noticed this rather "interesting" post which I didn't pick up when this thread originally surfaced! Reading it I couldn't help wondering... When is a brand no longer "new" in your mind Jon? Frsky have been going for 12 years and (though there have been a few hiccups along the way, as with every brand since 2.4GHz came into use) have got an excellent reputation for reliability. Indeed the inbuilt (and extremely affordable) telemetry saved a number of my models in my early days with 2.4, as it identified sub-optimal antenna placements I had used when I was mistakenly applying the same thinking as with 35MHz. Had I been using Futaba I would have crashed those models as they would not have had RSSI telemetry onboard. Futaba themselves made a pretty nasty mistake in 2008/9 where FASST TXs were going out the door with the same 0000000 GUID (see post 387), meaning they could interfere with any other Futaba TX with the same issue. Did you not break your own rule in buying the DX6? Spektrum have definitely not been around 30 years! Had Futaba been around 30 years when you started using them? I believe they began producing hobby RC sets in the early 60s, so it must have been rather close...?
  15. This should help on OpenTX-Uni - it is all about tacking via a GPS sensor, but all telemetry logs are triggered the same way... http://open-txu.org/home/special-interests/telemetry/setting-up-google-earth-companion/ So in summary, if you prefer the written word to watching Youtube when it comes to setting up your TX, I would always start with OpenTX-Uni or Mike Shellim's excellent OpenTX site, and Oscar Liang is also worth bookmarking. However, finding the content on his site is best done via Google; for some reason he doesn't seem to have an inbuilt search function.
  16. In that case the Multiprotocol TXs win hands down - with such a wide variety of RXs supported it is literally impossible for it to turn into a paperweight. That is not something you can say about any proprietary system; look at all the protocol changes there have been down the years from Futaba, Frsky and JR, though some (Frsky and Spektrum) have been a slightly better about continuing to support older protocols and make RXs avaliable for them. I have held one of the low end Futabas, and frankly these days I would rather take a Radiomaster, Frsky or any other challenger brand - the physical quality was no better than those TXs and way down on "old skool" Futaba, and of course they have many fewer features (especially telemetry) compared to other TXs being sold at those price points. I also remain unconvicned that they will continue in hobby grade RC in the long run- they are a pretty big company with fingers in lots of pies, but have taken a hammering in RC in of market share in recent years. To get back against the likes of Frsky and Jeti would take huge investment - do they have the will and £££s to do it?
  17. Yes, pretty simple - just configure the timer as persistent (assuming Edge is identical to OpenTX, which I would by 99% confident it is in something as basic as timers). OpenTX-Uni has you covered… http://open-txu.org/glossary/timer/
  18. Really nice finish, great job. I jsut hope after all that work the performance is satisfatory - the only one I ever saw slope was a brick, it was great off the sea in smooth, turbulence free air but rubbish at all the inland sites the owner tried. I hope you have a big hill! ?
  19. Based on your description it sounds like you can just add a washer or two under the mount to reduce the downthrust without consulting any original plan or instructions - it is not going to cause it to become suddenly unflyable, and will probably address your issue.
  20. For any single transaction there can be an element of luck to be honest, but by the letter of the law you are likely to be charged VAT (which it looks like BG collect at source anyway, though their help page is about the EU rather than UK), and customs duty dependent on what it is and the value. More on the Gov website...
  21. Yes, I understand that, my question was what is the actual measured IR of these “200C” rated packs - if we know that, capacity and SOC there are ways to calculate the real world effective sustainable C rating for more typical fixed wing and heli usage.
  22. As per @Andy Stephenson’s post, there are a lot of factors that influence IR. For that reason if you want to use it as a measure of battery health you need to measure it at consistent cell state of charge (SOC) and temp, and ideally long enough after charging or discarding that any difference in internal temp vs ambient has dissipated. If you are keeping track over time then you need to note the ambient temp and SOC alongside the IR readings. Purely for reasons of practicality I measure at storage charge level (for me that is 3.7-3.8V/cell off load) just before charging for use - this means if there is an issue I will pick it up before charging, and because IR will be slightly higher at lower voltage which means it’s easier to see if a cell is starting to increase in IR versus the others (discerning between cells that all have very low IR is beyond most hobby grade kit).
  23. Can I ask what the IR of those 160-200C rated packs actually is? I’ve never owned any rated that high, but when you think about the currents we are talking about I do really struggle to believe that those figure are even remotely close - you could quite imagine the solder giving way at those kind of currents!
  24. This is sensible advice, but I always check the IT before I have even charged it, as some manufacturers wil do whatever they can to wheedle out of a replacement. I remember having to show IR and voltages in a video to get HK to give me a refund once, then after all that they asked me to dispose of the pack and jsut credited my account.
  25. Simple answer- ask him to quote a referenceable source, if he can't them I'm afraid it's just more lipo FUD... ? https://batteryuniversity.com/article/bu-701-how-to-prime-batteries Lithium-ion Some battery users insist that a passivation layer develops on the cathode of a lithium-ion cell after storage. Also known as interfacial protective film (IPF), this layer is said to restrict ion flow, cause an increase in internal resistance and in the worst case, lead to lithium plating. Charging, and more effectively cycling, is known to dissolve the layer and some battery users claim to have gained extra runtime after the second or third cycle on a smartphone, albeit by a small amount. Scientists do not fully understand the nature of this layer, and the few published resources on this subject only speculate that performance restoration with cycling is connected to the removal of the passivation layer. Some scientists outright deny the existence of the IPF, saying that the idea is highly speculative and inconsistent with existing studies. Whatever the outcome on the passivation of Li-ion may be, there is no parallel to the “memory” effect with NiCd batteries that require periodic cycling to prevent capacity loss. The symptoms may appear similar but the mechanics are different. Nor can the effect be compared to sulfation of lead acid batteries. A well-known layer that builds up on the anode is the solid electrolyte solid electrolyte interface (SEI). SEI is an electrical insulation but has sufficient ionic conductivity to allow the battery to function normally. While the SEI layer lowers the capacity, it also protects the battery. Without SEI, Li-ion might not get the longevity that it has. (See BU-307: How does Electrolyte Work?) The SEI layer develops as part of a formation process and manufacturers take great care to do this right, as a batched job can cause permanent capacity loss and a rise in internal resistance. The process includes several cycles, float charges at elevated temperatures and rest periods that can take many weeks to complete. This formation period also provides quality control and assists in cell matching, as well as observing self-discharge by measuring the cell voltage after a rest. High self-discharge hints to impurity as part of a potential manufacturing defect. Electrolyte oxidation (EO) also occurs on the cathode. This causes a permanent capacity loss and increases the internal resistance. No remedy exists to remove the layer once formed but electrolyte additives lessen the impact. Keeping Li-ion at a voltage above 4.10V/cell while at an elevated temperature promotes electrolyte oxidation. Field observation shows that the combination of heat and high voltage can stress Li-ion more than harsh cycling. Lithium-ion is a very clean system that does not need additional priming once it leaves the factory, nor does it require the level of maintenance that nickel-based batteries do. Additional formatting makes little difference because the maximum capacity is available right from the beginning, (the exception may be a small capacity gain after a long storage). A full discharge does not improve the capacity once the battery has faded — a low capacity signals the end of life. A discharge/charge may calibrate a “smart” battery but this does little to improve the chemical battery. (See BU-601: Inner Working of a Smart Battery.) Instructions recommending charging a new Li-ion for 8 hours are written off as “old school,” a left-over from the old nickel battery days.
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