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Member postings for Frank Skilbeck

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

Thread: Have I enough power?
28/01/2020 16:09:39

On that motor the other option would be a 15 x 8 prop on a 4s which would give 4kg static thrust at 57amps or a 15 x 10 which would give 4.7kg at 67 amps.

The 14 x 7 will give around 3.2kg at 43 amps on a 4s or 6.1 kg at 82 amps on a 6s.

So if you go with a 6s then you could prop down a bit, say a 13 x 6, which gives 4.7kg at 60 amps, or go with a bigger prop on the 4s, but a 6s sounds a better option and remove some of that lead in the nose.

Note all the above are calculated results and should be confirmed by measuring the amps.

BTW we are just restoring a Mick Reeves Hurricane of a similar size and have gone with a 5060 380kv motor with a 15 x 10 prop on a 6s setup. Should be flying this spring once our strip has dried out and had a few rolls/cuts.

28/01/2020 12:35:17

Couldn't find your exact motor, but when I ran a 850kv motor through Ecalc with a 5000 mah 4s and APC 14 x 7, I got 5.2 kg static thrust, 10,000 rpm, 1400 watts and 100 amps. Have you checked the amps your set up is drawing

Thread: Most flown model
27/01/2020 11:03:10

My Dads old Majestic Major, built in the 1980s, was until recently powered by a Laser 75, but the bearings need replacing so now on a Laser 62. Was originally on Fleet radio and servos, but I lent the model to a clubmate some 15 years ago and he changed the servos to work with his radio, when I got it back I flew it on a 35mhz MPX Cockpit Sx, which it's still flying on today. The airframe is tatty but all original, I could refurbish it but want to keep it original.

It gets used on Air Cadets/Scouts/Cub sessions and for anybody who wants to have a go, including our local MP, as it doesn't do anything quickly, wirelessly buddied to a 2.4 GHz MPX Royal Pro.

Thread: Capacity checker accuracy?
23/01/2020 08:17:02
Posted by Keith Miles 2 on 22/01/2020 21:47:55:

Frank,

Totally agree with you there but many modern, and not too expensive, chargers are as good as it gets, in practical terms, for monitoring and testing the condition (or deterioration) of one’s packs.

Edited By Keith Miles 2 on 22/01/2020 22:04:25

Yep, but just measuring mah put back in doesn't tell you what the actual capacity of the battery is, you'd need to do a controlled discharge at set discharge rate until the battery reached it's minimum volts and then recharge it. Yes Lipo checkers are only measuring voltage (and the ones I've used are fairly accurate), and converting it to % based on the "actual" capacity of the battery. The original post was noting that the checker was saying 7% when based on the name plate capacity it should have been 25%, but was that the actual capacity of that battery I know I have some which are at less than 60% of their original capacity.

If you discharge a Lipo to too low a voltage you do lasting damage. If after landing you find the resting cell voltage is very near the fully discharged state (0% capacity) then either reduce your timer or if using telemetry the mah used alarm.

I

22/01/2020 21:19:57

With lipos the offload voltage is a good measure of the remaining capacity, what is misleading is to think that your 3,000 mah battery is still 3,000 mah many cycles down the line, especially with the load we put on them.

With Nimh and Life batteries voltage is not an accurate measure of remaining capacity.

22/01/2020 21:02:42

Also bear in mind that Lipos lose capacity over use, especially if you run them right down, so what was a 3,000 mah battery when new might now only be a 2200 mah battery, also wait 15 mins or so before using your checker you may see the voltage rise and the capacity come up.

I use the capacity checkers as a rough check, but use a telemetry ammeter to alarm after xxxx mah rather than rely on a timer.

Thread: Futaba T14SG chat
22/01/2020 18:54:26

The receiver instructions do say it has battery failsafe on channel 3, but don't say at what voltage.

Not Futaba but on another plane we had problems with a faulty servo overloading a BEC, it was fine on a nimh battery, but the BEC kept cutting out until we found and replaced the faulty servo.

22/01/2020 13:46:14

Mick, could this be the low receiver battery failsafe, see page 80 of the manual.

Thread: Multiplex Cockpit Sx 9
22/01/2020 12:27:29

Tony, I just did a quick internet check, From what I read if the battery is contained within the equipment it can be shipped, the regulations do not permit the shipping of loose batteries without additional precautions etc.

BTW I sent my Profi to Mike Ridley for repair (after I'd damaged the USB port) and shipped it with the battery with no issues.

Edited By Frank Skilbeck on 22/01/2020 12:27:48

Thread: Spektrum DX6i Throttle issues
21/01/2020 22:34:22

Just a thought, go into another model memory and set it to Airplane model, set the throttle travel to +/- 100% with the trim down and check the movement on the servo monitor, if the throttle moves over it's full range then the stick is OK and it is something in the Heli programming.

Thread: Problems with Spektrum receiver ar6600t
21/01/2020 12:07:59

Have you got the ESC servo plug in the correct way round?

Thread: Just Curious
21/01/2020 12:03:52

No, but then again the plod probably don't want to damage their cars on the potholes in the local roads................

Would be interesting to ask the CAA how many times the police have made a request on their database.

Thread: Recommendations please
20/01/2020 15:57:39

If you want to charge up 4 pack simultaneously then the Turnigy charger above would do that, plus it will have a cycle facility so you can periodically discharge and recharge them. If you wanted a mains/battery powered unit then I've been using the Overlander/SkyRC D100 dual charger, which has worked well, but it can only do 2 batteries at a time.

Thread: 1/3 Fly Baby
20/01/2020 08:41:20

Cracking, I'll bet you are still smiling yes

Thread: Synthetic instead of caster oil?
19/01/2020 20:52:07

And of course if you say halved the oil content from 20% to 10% then you'd actually be reducing the oil flow to the engine by around 55%, not 50%, as you'd have to reduce the mixture flow to keep the fuel flow the same. And you should get around 12% more runtime on the same tank.

Been running my Laser 150 on 10% oil, has almost a gallon through it, no ill effects so far and removing the rocker cover shows these very well lubricated.

Thread: SkyRC D100 V2 AC/DC Dual Balance Charger Charging Problem
19/01/2020 19:06:08

Jim, glad I could help, lovely to hear from you, it's 30 years since I left Aberdeen and ADS. Have seen Norrie a couple of times on the Mynd.

19/01/2020 17:04:13

In the systems settings menu the first screen should show how many watts are allocated to the DC supply and Ch1 and Ch2, normally this should be DC Supply OFF, channel 1 and channel 2 50w each. If they aren't then enter this menu and change them.

The other thing you could try if you suspect the power supply (but I'm not sure why you'd get the menus if it didn't power up) would be to connect a DC supply (e.g. 3s/4s lipo) to the DC input and see if it then works.

19/01/2020 13:22:16

Never seen this message on mine which has been in continuous service for the last 18 months. You can go into the menu and allocate how much power you'd like allocating to each charging circuit and the 12v power supply, could you have accidentally amended this.

Thread: FrSky Major Update for most TX and RX
17/01/2020 17:18:30
Posted by Robert Welford on 17/01/2020 15:44:07:
Posted by MattyB on 17/01/2020 15:13:45:
I don't think there is a manufacturer out there who hasn't got something like that in their 2.4GHz implementation history at this point.

Edited By MattyB on 17/01/2020 15:15:56

Not Multiplex 2.4GHz M-link

Not quite MPX did one RF firmware update, but it didn't require any Rx updates only a rebind.

16/01/2020 21:54:39

This update is probably driven by this note this is a German Frsky forum so you may need your web browser to translate it. But basically some users had reported random servo movements and these guys managed to track it down and send the log files to Frsky.

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