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Member postings for Gordon Tarling

Here is a list of all the postings Gordon Tarling has made in our forums. Click on a thread name to jump to the thread.

Thread: RPM Conundrum
10/06/2019 08:50:43

Sorry - dup post.

Edited By Gordon Tarling on 10/06/2019 08:51:07

10/06/2019 08:50:42

Most likely just down to variations in rpm/V and batterry age/internal resistance, as already noted. If it's within the rules, warm the battery up to around 40C in a battery 'oven' just before flying - it'll make a difference. Don't go over 45C though.

Thread: RC Castle
30/04/2019 07:42:03

I've used RC Castle a few times over the years and always received excellent service. My most recent order was delivered approximately 2 months ago, without problems. Suggest you email them first if you've any doubts.

Thread: Where can I buy Profilm (Oracover) by the metre?
26/04/2019 09:06:43

Try West London Models, near Heathrow.

Thread: Eflite 60amp esc
19/04/2019 09:24:40

Common reasons for this problem -

1 - plug at receiver end is wrong way round, but if servos work, it's probably not this.

2 - Throttle channel is reversed.

3 - Throttle channel pulsewidth is too high to initialise the ESC - try reducing it with either trim or subtrim.

4 - can you try the ESC with another motor?

Thread: Charge currents
24/03/2019 12:11:05

Charge the two Eneloop batteries at 1 Amp or less. They CAN be charged at up to 2 Amps, but they tend to get warm at that level, so best not to. As for your lead acid battery - we need to know what type and capacity before making a recommendation.

Thread: Propguy?
01/03/2019 09:38:15

In this day and age of easy and instant communications, there can be no excuse for not replying to anyone within a reasonable period of time. I tried to contact Propguy some time ago with a query about a L/H prop and never had a reply, so I went elsewhere in the end.

Thread: Field mower question
15/02/2019 11:35:46

Many garden/agricultural machinery specialists will have a range of used machines for sale and will guarantee them. The same specialists are also usually capable of doing repairs, so worth asking at least a couple for a quote to repair your existing machine.

Thread: Mini/micro lathe
14/02/2019 09:21:27

There's a lot of info on this website - LINK Unfortunately, it would seem that he now has started charging for access to some of it.

Thread: Catastrophe!
02/02/2019 18:01:14
Posted by Nigel R on 01/02/2019 12:21:56:

" It's been well proven that Eneloop cells have a high internal resistance"

From memory, manufacturer data on internal resistance suggests they do not. Do you have a link to any testing done on Eneloops that disproves the manufacture information?

The original nimh cells were quite high internal resistance but the newer low discharge cells are much improved.

Nigel - there's some discussion on the subject here - link I have to admit that I've not done any testing, what I say is just based on personal experience.

JonathanM - A123 cells are my preferred choice when a model requires a receiver pack, the 2300/2500mAh cells can easily supply 60 Amps, though they might be a bit large for many models, but you only require two for a receiver pack. There are also 1100mAh (I think) cells which are obviously smaller. There are many 18650 sized cells on the market, which are suitable, too, but you need to ensure you use the big name types with lower capacity, i.e. Panasonic, Sanyo etc.

Edited By Gordon Tarling on 02/02/2019 18:28:08

01/02/2019 12:14:31

Jonathan - Do yourself a big favour and replace any 4 cell Eneloop Rx pack with a 5 cell one. It's been well proven that Eneloop cells have a high internal resistance and are unable to deliver the required current without a large voltage sag. Using 5 cells helps to get around the problem, though I'd prefer to use other types of cell myself.

Thread: Saws..A Cutting Question.
01/02/2019 11:58:30

Bandsaw, beyond any doubt. I have a scroll saw and its only real use is cutting out the centres of formers etc. The bandsaw can do so much more and I wouldn't want to be without one. Get the best one you can.  I should mention that I've tried strippers that use a knife type of blade and always found the blade has a tendency to follow the grain, giving a wavy cut.

Edited By Gordon Tarling on 01/02/2019 12:00:29

Thread: Can a drone fly at 10000ft?
17/12/2018 17:05:50
Posted by Don Fry on 17/12/2018 15:36:09:

Cheers Steve, sounds better. I take your point, up front of one of those things. Birds you can't do much about, plastic bags are of no interest. And then you get the possibility of a drone gets on the agenda. Will make you wish that possibility would go away. And you see some things wrongly. Reckon I would.

Plastic bags ARE of interest Don. Ingested into an engine, they melt and can block vital cooling holes in turbine blades etc.

Thread: Voltage sensor
10/12/2018 17:54:33

Chris, the FBVS sensors are readily found on 'the bay'.

Bob - will bear in mind that a small pot will work just as well. I'm guessing a 10k pot would be OK?

09/12/2018 17:07:25

Thanks chaps, got it all working properly this afternoon, using the FBVS sensor. Not sure what I was doing wrong previously though. I think I've calibrated it correctly, as it's showing the correct voltage on the Tx screen, so now I have to set up a low voltage alarm for it.

One thing puzzling me is that I keep getting 'telemetry lost' warnings during the setting up process - is this just because the Tx is very close to the Rx?

BobCotsford - thanks for that info, handy to know.

08/12/2018 18:08:42

Carperfect - I don't really want to be re-flashing the Tx if it can be avoided.

Andy48 - I'm fairly sure that I had the FBVS connected as shown in that documentation. However, I'll re-check the connections tomorrow and do some voltage/continuity checks if I can't get it working. BTW - very useful link to that documentation, I've not seen that before - thanks.

08/12/2018 16:07:30

Thanks for the advice chaps. I bought an FBVS-01 a couple of weeks ago and connected it up as shown in the documentation, but the Tx doesn't find it as a telemetry sensor. I did read that it will only work with the D8 receivers, which aren't compatible with my Tx, though that doesn't seem to be entirely true.

I'm wondering if the FCS-40A current sensor also gives battery voltage - does anyone know?

Bob - the resistor divider sounds feasible to me - will investigate that method.

Yes, SLA means Sealed Lead Acid battery - not much use in aircraft, but frequently used in boats.

I'll have another crack at the FBVS sensor tomorrow.

08/12/2018 12:55:23

I'm using a Q-X7S transmitter and a X4R receiver for a model boat. I'd like to get telemetry for the drive battery voltage (12V SLA) - any idea which sensor will work?


Edited By Gordon Tarling on 08/12/2018 13:16:08

Thread: Retractable SLS Systems
08/12/2018 12:43:10
Posted by leccyflyer on 08/12/2018 12:17:01:

What's an SLS system?

Self Launching Sailplane - i.e. it has a motor. I think the type the OP is looking for is a retractable type which folds away into the fuselage, normally just behind the cockpit. I haven't found a cheap one yet! Other options are available and I'd suggest the OP explores those through the dedicated gliding sites.

Thread: turnigy G46 bearings
28/11/2018 10:27:13

If you want to replace them, I suggest you remove the old ones and measure them. That's the only way to be 100% certain of the size. Also, don't just measure one like I did recently, bought the 'correct' bearings, only to find that the one I hadn't previously removed was a different size.

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