Phil Green

You realise thats just the shell, the actual crimp connectors are a separate item? 🙂

2mm spaced header sockets are almost as common as 2.54mm outside R/C, not at all unusual, we use them for in-circuit programming headers :) There are many types, Harwin, TE etc all do 2mm plugs & sockets

I dont know about the battery, but to me, everything about that label says "Avoid" 🙂

To justify the topic wandering, what I'm saying is that although the Cox .049 is a really old engine from a nostalgic era, its still available brand new, so the future of Cox engines is secure - at least for now and for the life span of their new engines 🙂

Never done the big stuff but my own favourite of all time is the humble Cox Babe Bee. Ultra reliable, easy to start, easy to install, the option of running backwards in a pusher, still available to buy new in standard or custom format - whats not to love. Apart from the racket.... 🙂 I found one of my several old ones, untouched for maybe 40 years - holding it in my hand I squirted in some prime, some in the tank and connected the glow head. It started immediately which left me with a screaming engine in my fingers which was getting hotter and greasier by the second... I can be pretty dumb. More recently I bought a new custom diesel Cox from Cox International (IIRC they were called 'Xenolook' at the time) and its been brilliant, though the teflon contrapiston needs changing frequently and its a bit more finnicky than the glow. I might convert it back - just a case of swapping the head. Love Babe Bees. EEEEEEEEEEEEEEeeeeeeeeeeeeeeeeeee...

Generally speaking, as Simon & Steve said - once a LiFePo4 is discharged to that level then its beyond recovery. If you do manage to get it to 6v6, it wont hold it and its charge capacity will be gone.

Keep at it Matty, small wins every day... 👍

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. 🙂

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.

Frsky X series, so full range. And isnt that the Taranis stick unit?

😁 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? 🙂

30 seconds initial load, then 30 seconds per click... fibre to premises

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 🙂

Matty what can I say so sorry to hear this - hope you're on the way to a full recovery soon Phil

No response for half an hour up here in Ponty, everything else ok, just this site 🙂

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 🙂

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

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.

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

Is it one of these? The 'end-to-end' swing is a feature of these testers, could it be you're accidentally pressing buttons?

Erm.... 😉

Ahem. "AerOfoil" - it matters! :)

Try flying an aerobat on Reeds!

I dont use it on anything. Just move the stick less 🙂

Many of mine use a single 18650 Lithium cell, direct without a booster. Same for transmitters but 2S. No need to remove and a charge lasts absolutely ages. The cells are bought as Lidl 'Parkside' drill packs, these are really good cells that I also use on my ebike: https://mode-zero.uk/viewtopic.php?p=5800