Dickw

1. Most of our battery chargers have a discharge ability. If I discharge packs at the same current setting it will allow comparison of the relative capacity between packs. 2. My chargers will also measure internal resistance. I don't really have a pass or fail value, but use the better cells in more critical applications. Packs are scrapped when they won't do any of the jobs I need doing rather than any fixed value. 3. Yes, full throttle while handling a meter can be "fun" 😀. I gave up doing that some years ago and invested in data logging. On board loggers are available, but if you have a telemetry radio set with logging in the Tx that is now more common using current etc. sensors in the model. Just run the motor or fly the model and read the data later. I have attached an example of a flight with my TN Gnat mini EDF yesterday to show what is possible. Dick

In theory, the higher the C rating the lower the internal resistance and so the higher the voltage on load. That should give you better performance at whatever load you chose to run. In practice of course, marketing has a lot to do with claimed C ratings. I regularly take up to 200A for short runs from 1500mAh packs, but the wiring etc. survives because the runs are only a couple of seconds. I am presently using 6s 3000 GNB 100C packs in a large glider and they seem quite happy in the 65 - 70A range for the 25 to 30 second motor runs I am using (I get 3 climbs per flight). Probably just me, but I have never had a lot of luck with packs from Overlander. Dick

If an ESC has a switch I tend to cut it off, then either insulate the two ends or solder them together depending on which way leaves the ESC operational. Dick

Yes, changing "Theme" solves issue on both my laptop and mobile - but definitely prefer the Darker theme if it can be made to work. Dick

Yes, that is what is being referred to. For the benefit of those who don't have the problem - if I click on "PREV" or any other page number in a thread it just takes me to a page that is either blank or has a single advert (depending on browser). The only way out of that "blank" page is to refresh the screen and then I get to where I wanted to go. I have to do that every time I change pages in a thread. I can live with adverts part way down a page, but having to refresh each page jump is annoying and likely to be a fault. Dick

Windows 10 laptop with Firefox, Chrome, or Edge, plus Android mobile with Chrome, all the same - have to refresh the screen to get rid of blank/advert only page when moving backwards or forward through a thread. Can't find any option to open in 'safe mode' in my version of Firefox, but I can "restart" in Trouble shoot mode which is supposed to disable all add-ons. Unfortunately that doesn't get rid of the blank/advert page when paging back or forward through a thread. Dick

Seems like it is easier to stay logged in and just put up with having to "refresh" when changing pages - which I now have to do on both PC and mobile! Dick

Can you still post when not logged in?

I see you lot are still playing with this relatively simple problem, so why not just look at the laws of physics, especially those explained in the theory of relativity. There is no such thing as absolute motion, everything is moving relative to something else – particularly the observer of that motion. We usually measure speed relative to the ground because that is where we are, but for an aircraft speed relative to the air mass is the relevant speed. Indeed, a plane flying in a high wind can have a positive airspeed but a negative ground speed If we watch an aircraft taking off, we see it moving relative to the runway, but to anyone in the plane they are stationery and it is the runway and air mass that is moving relative to them. So:- a) Relatively speaking all we can say is that for a normal take off the plane moves in the opposite direction to the runway and the air mass. b) The question states that the runway/conveyor belt (but not the air mass) moves backwards, so that must be backwards relative to its normal direction – i.e. it is now moving in the same direction as the aircraft. c) If the conveyor belt/runway moves in the same relative direction and speed as the aircraft the wheels will not rotate but the aircraft will still take off. That’s me finished, and I must sign off now as I have some relatives coming round relatively soon. Dick

The shape of the flame as we normally see it is created by convection air currents, These convection currents are caused by the candle heating up the local air relative to the rest of the air and gravity moves the air because of the now different air densities. In a falling sealed box like lift there is effectively no gravity, so no convection currents, so nothing to shape the flame and it will adopt a random shape – probably tending towards spherical. Interestingly there is now nothing to hold the candle on the floor either, so that might also start to move around propelled by the flame 😀 (think of it as a small very inefficient rocket motor) Dick

What have the wheels and conveyor belt got to do with it? If the throttle is opened the plane will move forward through the air driven by the propeller or the jet output and should eventually take off. Unless of course the plane is moved by the engine driving the wheels, in which case any such plane wouldn't fly for long even if it did take off 😀. Dick

Run the motor as normal with your ESC. Don't connect a lipo direct to the motor wires - that would be a dead short and a big bang 😨 Dick

kv is the relationship between motor rpm and volts, so there are two options. Run the motor at full throttle without a prop on using the lowest voltage battery you have so it doesn't rev too fast. Measure the battery volts and the motor rpm at the same time. kv is rpm divided by volts. You can do this with a prop on, but will have to estimate by how much the prop is slowing the motor down - so a bit of a guess! Alternatively, spin the motor up on its own (e.g. using something like an electric drill) and measure both the rpm and the volts generated by the motor. Again, kv is rpm divided by volts. Dick

No changes - motor and ESC are standard and still going strong on 4s. Update - I did lose a battery eventually so have added an additional battery strap! Dick

Airframe drag increases as the speed increases, so a fast plane needs more thrust than a similar plane flying slower. Thrust is produced by the volume of air being moved by the prop (related to diameter and pitch) and also the speed at which it is being moved (related to pitch and rpm). As GG said, “air isn’t solid” so if the thrust being produced by your prop is not equal to the thrust required by your plane at ‘pitch speed’ (prop pitch x rpm) then the prop will “slip” i.e. it will not move forward as much as the pitch and will be operating less efficiently. Reducing diameter or pitch will reduce the load on the motor, so it will also speed up a bit as well as the current dropping. It is all one big balancing act. Experience and performance calculating software are both very useful. Dick

In general. yes. Dick

scroll down this page https://www.robotbirds.co.uk/electronics/heatshrink.html Dick

I am with you on this Martin. All my chargers are 12v only - powered from a 12v 50 amp server PSU in the workshop, and a 48Ah 12v LiFe batttery in the car. (my club field also has a battery backed solar powered 12v supply available). My 12v LiFe battery can charged from the car electric system going to and from the flying field, and a portable 100watt solar panel will keep it topped up on site and allow a complete weekend flying away from a mains power source. A bit over the top for the average club flyer though 😀 Since I sometimes drive long distances to fly I also prefer separate chargers to a multi channel one. If a multi channel charger failed it could ruin a days flying a long way from home, but the chances of 2 separate chargers failing at he same time is remote - again, probably not an issue for most flyers. I have a couple of iCharger 1010B which have given very reliable service up to 10s over several years and am happy to recommend the brand, but my current favourite charger is the Chargery 50010 http://www.chargery.com/50010B.asp (the 1.3 amp balance current can be useful) Dick

Another idea is to use a locking toggle switch as I do. Something like this https://uk.rs-online.com/web/p/toggle-switches/1648730 I am sure cheaper versions are available from other sources. Dick

We certainly played with timing back in the brushed motor and nicad days when power was marginal at best. Advancing timing increased power up to a point and then just added more heat, so it was best done with an ammeter or wattmeter attached and measuring rpm. Going the other way could reduce current and give a longer motor run. Dick

AURI Tyro Links to photos rarely seem to work. The best way to post images is to attach the file (not a "link") as per the instructions at the bottom of the reply box. See image attached. Dick

Jeti recommend timing of 8° - 12° for their geared 4 pole motors, so at least one manufacturer bothers. No idea why the others don't but perhaps, as Simon says, it only matters when the motor and ESC are pushed hard and that would tend to be the case for many people buying the Jeti motors. Dick

OK, so what receiver and transmitter do you have? Once we know that, someone with suitable experience of the relevant brand will sure to be able to help. Dick

If the receiver and aerials are inside the carbon fuselage, it may be the carbon blocking the signal. I know that with my carbon DLG I have to have the aerials outside for anything to work. Does the receiver bind OK if outside the fuselage? Dick ps what receiver and transmitter do you have?