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Posted by: carlou
6 hours ago
Forum: General
- No Replies

Because of the incident last December that I almost crashed my Freya helicopter, I endeavoured to do a bit of analysis on what is happening on the 2.4GHz band. I don’t claim that this is accurate but this is how I see the problem arises.

First, I used the spectrum analyser of the TS16S radio to capture the 2.4GHz spectrum. Here’s what I found. There are instances where I got some readings with frequency spikes along the spectrum. Unlike the old days wherein each radio is operating on a fixed frequency, now a days, radios are hopping within the 2.4GHz band looking for a clean signal and will use that signal for a while before hopping to the next signal. The algorithm implemented by the manufacturer are complex but for illustration purpose, say the radio has picked 2.400GHz. So radio is communicating with the transmitter at 2.400GHz. Then before it hops to the next available frequency a strong interference comes in as shown in the spectrum analyser. During this time, you will loose connection until the radio decide to hop to the next available frequency. When it happen, the receiver will go to failsafe settings (usually set to No Pulses). Which means all control signal will go at center stick and throttle at zero. And this is where the OH SHIT moment happens.

   

Here's the actual log when the incident happen. It shows that the throttle went to failsafe but when the radio hops to the next frequency, I was able to gain control to execute autorotation. But for helicopter, when the throttle drops to zero, it will take time to spool the rotor. Before it can generate lift, the heli is already on the ground. The only way out is to AUTOROTATE and land the heli. For plane, it is less forgiving as it will still glide during that short period of time. But check your ESC settings because there are ESC's that once the throttle is lost, you have to go to ZERO throttle before you gain throttle control. No matter how you push the throttle if you did not pull it down to zero, you will never gain power.

   

Maybe its time to run at 900MHz. Crossfire or FrSky R9M module. I like the R9M module cause FrSky has a receiver for this module that supports FPort (Control signal and telemetry signal in one wire). FPort is SBUS plus SPort in a single wire.

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Posted by: gilesfield@hotmail.com
11-01-2022, 10:39 AM
Forum: General
- Replies (2)

Greetings, I'm new to the hobby and work close by to the aerodrome and was wanting to access the field to do some training in my lunch break.

Do you allow this/is there requirements (access fees/membership required) that need to be fulfilled before so. Any answers would be appreciated.

Thanks
Giles

Ps i live in penrith otherwise i'd drop down on a weekend.

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Posted by: greggold
09-12-2021, 11:08 AM
Forum: General
- No Replies

I found this video had new information on CASA requirements for model aircraft registration, even though it comes from AMAS which is trying to compete with MAAA

https://www.youtube.com/watch?v=6vAbpbchW5M

There is good news here for most of us, for example people who fly gliders at slope sites, who fly at CASA registered model aircraft fields, and others. Come June 2022, I think it means most PRCAC members have no problems.

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Posted by: carlou
10-11-2021, 05:30 PM
Forum: General
- Replies (7)

I am currently building a Reactor Electrify plane. Any help/advise will be much appreciated.

         
   

Finish product. Hopefully it will look like this.
   

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Posted by: carlou
09-11-2021, 09:47 AM
Forum: General
- No Replies

Anybody selling an FrSky radio that supports ACCESS protocol?

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Posted by: Florian
08-11-2021, 07:44 PM
Forum: For Sale
- No Replies

Good condition. Repair made to undercarriage (see pic), does not affect usability. Comes with Spektrum AR636B receiver with AS3X stabilisation and safe mode. Requires transmitter and 3s or 4s 2200 mAh lipo to fly.

Price: $350 

Florian mob 0401692360

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Posted by: greggold
05-11-2021, 03:02 PM
Forum: General
- No Replies

Many Taranis ACCST users don't consider there is any problem, but a major effort by Aloft Hobbies has gone on and new rx firmware is becoming available that may be of interest to those still using ACCST. Here is what they say:

Universal ACCST Firmware for FrSky!

Aloft Hobbies has been working for months on this project and the first phase is now in the final testing phase.  We have developed a brand new firmware for FrSky ACCST receivers and would like to share this exciting news with you all.

What is Universal ACCST receiver firmware?

It is a BRAND new firmware that Aloft Hobbies has helped to develop for FrSky ACCST (D16) receivers. This is not made by FrSky, but they have approved the project.

If you have been using FrSky gear for a while you will be aware of the ACCST V1 bug and FrSky's fix with ACCST V2. While the bug was fixed with V2, it was not backwards compatible with V1. This forced users to update all of their transmitters and receivers to V2, or stay on V1 and risk the bug affecting their flying. For example, a V1 receiver cannot talk to a V2 transmitter.

This was causing a real mess as many people had challenges updating their firmwares (Aloft can do this for you) and FrSky started shipping out some products with V1 and others with V2. What a headache, we can do better!

The Solution

We needed to start with a brand new approach and this was going to require a excellent programmer and a team of testers and RF pros to challenge him. This is what we did, and the end results are looking amazing. Here are a few highlights of what has been achieved:

A single Firmware that can talk to V1 and V2 transmitters.

A single Firmware that can talk to FCC and EU-LBT transmitters.

No new firmware is needed on the transmitter, just the receiver.

The V1 bug has been significantly mitigated to, but if it does occur it only lasts a fraction of a second (18mS).

Added “Auto Tune” feature to lock into transmitter signal very accurately.

Added VFR (Valid Frame Rate) telemetry support.

Eliminated transmitter “swamping” when receiver and transmitter are very close to one another. (No more: “Telemetry lost, telemetry found” errors)

Eliminated the risk of entering failsafe when transmitter and receiver are very close.

Eliminated rare telemetry data errors (spikes) when RF quality is weak.

Added an option for inverted SBUS output.

Added a new Dual Bind feature. (Once you have bound one transmitter, you may bind to a second transmitter.)

and more.


This is still an ongoing project, and we are currently looking for a few pilots that could fly this new firmware and provide us feedback. Once we are done with all testing you will be able to purchase receivers from Aloft Hobbies with this firmware installed.


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Posted by: Florian
05-11-2021, 10:49 AM
Forum: For Sale
- No Replies

Excellent condition $130 negotiable. Requires transmitter, receiver and lipo battery (3s 2200mah) to complete kit.

Florian mob 0401692360

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Posted by: carlou
03-11-2021, 10:01 AM
Forum: General
- Replies (1)

I found these ESC's and Motors in my inventory sitting for 12 years and can't even remember what plane will they fit. Can anybody help determine what size of plane can they be used? Maybe I can utilize then again. The big one is still in the box.
             
           
       

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