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Member postings for Steve J

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

Thread: switching of main lipo battery
12/09/2020 10:01:56
Posted by Bruce Collinson on 11/09/2020 22:08:09:

I don’t do electronics but remain bemused that nobody puts these together commercially, short of a Jeti.

It's a solution looking for a problem. If there was a market, people would make them.

11/09/2020 18:33:04
Posted by Phil Green on 11/09/2020 17:12:57:

Posted by Steve J on 11/09/2020 15:09:55:

Just make sure that you use the diagram in post #21. The ones in post #8 are confusing.

The previous diagrams are correct for the more common integrated ESC/BEC.

The diagrams in #8 show the FET twice. When challenged the author said that the second FET was to show the physical connections.

11/09/2020 15:09:55

Posted by Phil Green on 11/09/2020 14:12:18:

Dennis has documented one, over on RCG: FET lipo switch , its a totally conventional low-side FET switch but he's drawn nice diagrams & everything,

Just make sure that you use the diagram in post #21. The ones in post #8 are confusing.

Thread: JR DSX9 programmable mix help
11/09/2020 07:51:34
Posted by Pete Carpenter on 11/09/2020 07:13:55:

I'll also try switching to aux2 and 3 - didn't even cross my mind to try that, duh!

Using aux2 & 3 you don't need the aux3 -> 4 mix as aux2 will operate off the right slider without a mix. Chaining mixes seems to be a problem.

If you want to keep using 3 & 4, if you inhibit the channels in DeviceSEL, you can have a get them working off with the flaps using a couple of mixes.

I had forgotten how restrictive the DSX9 is compared to the DX9.

10/09/2020 21:07:50
Posted by Pete Carpenter on 10/09/2020 17:26:18:

Any ideas where I'm going wrong?

I just turned my DSX9 on for the first time in ages.

Can you change to use aux2 and aux3? Using those channels I can get it so the spoilers would work off the right slider in some flight modes and off another control in others. This uses four mixes including 1 & 2 so you can have a curve in the second case.

Thread: switching of main lipo battery
10/09/2020 16:21:05

Posted by MattyB on 10/09/2020 15:54:38:

Everyone is different, but personally I am happy to rely on a software only solution - most TXs now have the capability to setup a “2-factor” sticky throttle cut (I.e throttle is only enabled when switch is on AND throttle stick at the bottom) which is very safe.

I have come to the conclusion that with my radio gear, the safest thing to do is not turn the transmitter on until the model is powered up and I am clear of the dangerous end.

10/09/2020 15:26:07
Posted by Bruce Collinson on 10/09/2020 13:52:09:

As a returnee with mainly leccy upto 6S I would pay quite well for a robust ready-to-fit set with say choice of XT 60 or 90 as it would provide exactly what I would like, ability to disconnect flight batteries via an external switch.

At the end of the day, how is having a one of these FETs controlled either by a switch on the model or a switch on the transmitter functionally different to having a switch on the transmitter that sets the throttle output to 0%? All these solutions rely on the pilot flicking a switch.

Thread: To stabilise or not to stabilise - the gyro question
10/09/2020 10:01:10

Posted by Bob Cotsford on 09/09/2020 13:26:07:

I'm starting to do the same, in my case using FrSky gyro receivers. Is it cheating? Depends on how you use it. I see it as an assistant for taking off or landing recalcitrant models, especially on a site like ours where we get a lot of turbulence. Why put up with stressful situations, it's supposed to be a relaxing hobby.

Indeed. It's a hobby, not a burden.

10/09/2020 09:59:25
Posted by Ron Gray on 10/09/2020 08:50:41:

SteveJ mentioned the ‘other’ type of gyros, flight controllers, now they are in a different league giving lots of programmable features leading to autonomous flight.

I use CC3D running LibrePilot which aren't up to autonomous flight and which I use as gyros in fixed wing models (currently only my PZ Mosquito). But you have just reminded me that somewhere I have a more powerful controller that will run iNav...

09/09/2020 09:42:38
Posted by TonyS on 08/09/2020 21:50:20:

The first situation - hand launching an edf. I had an unfortunate experience recently when hand launching a plane when I wasn’t quite quick enough back onto the controls after throwing it and a gust of wind tipped the thing sideways before it had enough speed to be able to recover. I suspect that a gyro would have quickly compensated and kept it level until I’d both thumbs back where they needed to be.

Following a discussion on another forum, I stuck a flight controller board in my Solius glider. The intention was to see if it smoothed out the turbulence on slope landings. I never got around to testing that, but I did program up a hands off the sticks launch mode, just open the throttle, throw and it would climb out at around 20°. It would also do hands off landings.

Thread: Can I have two Life batteries powering my Futaba receiver?
07/09/2020 07:23:50

This subject comes around every few months and it always goes the same way.

IMHO, if the model is worth two batteries, then it is worth putting a receiver or power management unit in that is designed for two batteries. My models with two batteries have Spektrum PowerSafe AR9100s.

I know a modeller who flew a jet on a couple of 5 cell AA packs though a SM Services box. I tried to explain to him that the reliability of this setup may be worse than that of a single subC pack, but he didn't get it .

Edited By Steve J on 07/09/2020 07:27:17

Thread: ploy C as fuelproofer
05/09/2020 20:50:23

I use it as a fuel proofer on firewalls and in fuel tank bays, but I have never used it over paint.

Thread: Farm vehicle interference on 2.4?
05/09/2020 14:26:31

Posted by Geoff Reynolds on 05/09/2020 14:07:13:

The flashing Rx light indicating a brown-out loss of signal! The Rx has never again suffered this.

A brown out is a loss of power. On DSM2 Spektrum receivers, the orange LED will flash slowly to indicate bownouts (resets). Some Spektrum receivers have a red LED that flashes to indicate holds (failsafes).

04/09/2020 13:43:24

There is a design for a 2.4GHz scanner over on Mode Zero.

If you do decide to make one, I would suggest using the nRF24L01 with the long range antenna rather than the basic one.

Thread: GPS jamming trials
04/09/2020 13:31:40

Another couple of trials have been announced on Skywise. Partial quotes below.

"Jamming activity will take place 8 September – 4 December 2020 in and around Luce Bay.

"The activity may affect GNSS receivers along with UAS and cockpit devices operating on 433, 868, 915, 2400, 5800 MHz operating up to 40,000FT AMSL within 55NM of 545020N 045548W (West Freugh)."

"Jamming activity will take place between 7 and 18 September 2020, affecting airspace in and around Salisbury Plain and the New Forest.

"The activity may affect some electronic situational awareness devices and UAV systems operating on 433MHz, 2.4GHz and 5.8GHz. Jamming may impact systems up to 1000FT AMSL within a geographical area bounded by the locations below:

  • 51°14’18N, 2°11’15W (Warminster)
  • 51°24’33N, 1°43’49W (Marlborough)
  • 51°3’42N, 1°19’12W (Winchester)
  • 50°50’55N, 1°47’19W (Ringwood)"

Thread: CAA Fee?
31/08/2020 18:25:51
Posted by Martin Harris on 31/08/2020 15:53:04:

Very much an annual fee but watch this space if/when EASA get their teeth into us!

Registration is handled by the national aviation authorities. You register in your country of residence. I doubt if the fee will go up significantly this year as, back in February, it was looking like the CAA would make their target.

As it stands at the moment, the UK and EU have not agreed the CAA's future relationship with EASA.

From the government's response to the Commons Science and Technology Committee report:

"The Government supports the principle of a validity period for longer than a year. However, until the actual volumes of registered users and related financial costs are known, and the requirements of the new EU unmanned aircraft Regulations (which will form part of retained EU law at the end of the transition period) established, the CAA does not think it is prudent to move to a longer validity period. An initial validity period of one year, during which the £9 charge applies, has therefore been chosen.

"At present the charge is based on estimated numbers of small unmanned aircraft operators in the UK, and therefore there is a risk that these will prove to be higher or lower than the true volume of operators. The CAA will review the charges against income over the first 12 months with a view to extending the validity period in future years once the volume of operators and exact costs of running the system are known. The fee will be reviewed by the CAA in accordance with its Scheme of Charges practices, including consultation with stakeholders. More information can be found in Charge Proposal for the UK Drone and Model Aircraft Registration and Education Scheme Consultation - CAA Response Document (CAP1804), which is available on the CAA’s website."


Edited By Steve J on 31/08/2020 18:30:45

Thread: Learning to fly on a large trainer
27/08/2020 19:54:09

The SKY-120 is the LMA trainer.

Personally, I would say start with an Easy Star II or Bixler and master that before thinking about moving onto the SKY-120.

Thread: Your Hacked charger PSU's.
26/08/2020 11:31:47
Posted by Jeffrey Cottrell 2 on 25/08/2020 19:42:34:

Next is there a neat way to connect the pins together.

If you don't have the tools and bits to crimp up the required connector, I would suggest butchering a servo extension or the lead off a u/s servo.

Thread: ESC cutting out on one type of battery?
25/08/2020 13:40:44

The 2900 is not holding up under load due to age, abuse or inadequate C rating. Recording the voltage during operation (with either a unit on board the model or via a telemetry link would give you an idea what is going on).

Edited By Steve J on 25/08/2020 13:41:26

Thread: Electro mechanical retracts control board
24/08/2020 09:59:49

The TB6612FNG chip looks interesting and is available on a board for very little money.

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