1. Parramatta Radio Control Aircraft Club
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  Frsky Tandem X20 tx and R10 rxs for sale

Posted by: greggold
11-10-2023, 03:45 PM
Forum: For Sale
- No Replies

SOLD

I am selling all my Frsky gear so I can focus my attention on one RC protocol. All the gear I have is in perfect working order.

I prefer to sell everything in one bundle.

The Tandem X20 tx is on sale for $320. 

There are 5 Tandem R10 rxs, 2 of which are new and unused. The new R10s $35 each, the used R10s $25 each 

2 R9 Slim rxs each $30

FrSky S2F.Port 2.0 Protocol Converter  $15

FrSky STK Tool for S.Port products Upgrading and S6R/S8R receivers Configuration  $10

The total value is $550 if items are bought separately. The entire bundle can be purchased for $450.

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  Assessing the condition of a lipo

Posted by: greggold
05-10-2023, 10:14 AM
Forum: General
- Replies (3)

John Hopke (in my opinion the best of the online RC bloggers) has a new video that shows how to assess the condition of your lipos.

The idea is you measure the number of mah during a discharge that goes from 4.2v to 3.6v, using a 2C current. This number should be above 85% of the nominal capacity, if not, he recommends discard the lipo.

The video shows a dedicated RC discharger being used to measure the percentage of nominal capacity, however I think most lipo chargers (that can discharge) can give you the measurement (of mah required to discharge).
The video is doubly worth a look as it explains several important points, such as why the discharge stops at 3.6v.

https://www.youtube.com/watch?v=PwvI5I2x900

The testing has a focus on 4S or 6S, 4000mah capacity lipos, and I think the smaller lipos I use (3S, 1000 or 1300 mah) may have higher internal resistance, and possibly should have a discard figure of 80 and not 85%.

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  Ultimate 3D aerobatics trainer

Posted by: greggold
03-10-2023, 10:48 AM
Forum: General
- Replies (2)

I am not a fan of RC simulators, and prefer whatever RC time I get to be expended at the field. However I have dabbled with flight sims (on a mac only a limited range of sims are available, the one I have is AeroflyRC9) and one of my favorite models is a indoor F3P aerobatic model called Elanor. Its the best aerobatic trainer you can imagine, allowing the pilot sufficient time to apply correct controls for each manoeuvre. You fly in a different flight regime where the balance of gravity and drag are altered. 

Yesterday at McCoy I saw an Elanor-type model in action, it is an original design, built and flown by Steve. Its a brilliant plane.

Here is an original Elanor in action in 2014. It has 2 counter-rotating props.     
https://www.youtube.com/watch?v=hHP5JF3k1bw

Here are various F3P vids:
https://www.pauzuolis-rc.com/events-list...-in-alytus
(you have to scroll down to locate the videos)

In  RC Groups there are threads and a forum for indoor aerobatic models, with posts mostly consisting of people searching for suitable parts.

Fortunately there are now practical F3P kits by RCFactory on sale:

https://www.rcgroups.com/forums/showthre...ATILE-CLIK

https://www.rc-factory.eu/letadla/indoor...lite-red-2

The kit price is Euro 73. If you buy it with the full equipment set it costs Euro 155. I have a superlite rc-factory model which I found took longer than an average RCFactory foamie to build, but its not more difficult. I fly it in a local oval at sunrise.  I found I did not need to buy the equipment set, as you can source your own suitable servos, motor, prop etc. In Australia Micronwings is a good source of small rc parts, eg 3gm servos:
https://micronwings.com/product/servo-em...m-digital/

Note you can fly indoor models outside, if you get up early enough when conditions are still calm, and you can fly them in a backyard or anywhere.

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  Preventing lipo fires

Posted by: greggold
29-09-2023, 01:13 PM
Forum: General
- Replies (2)

I do not have an outside garage to store and charge my lipos, the hobby workspace is inside our house.
I recently found a useful item at Bunnings, its a Craftright steel toolbox (159mmx137mmx385mm) for $15 that has a clip to keep the lid shut, and can hold 6 or more lipos. I now have 4 of the craftright boxes, 2 other metal boxes that look similar, and a medium Batbox which is a fairly pricey item. I divide my collection of 2S and 3S lipos between the 7 boxes, and I also place the removable lipo battery from the electric lawnmower in a box.

The storage is just one aspect of preventing a lipo fire, I am sure most points are well known but this article covers them fairly well.
https://dronebotworkshop.com/lipo-safety/

I generally charge 12 lipos for a flying session, so I use 3 dual chargers (mainly ToolkitRC M6D, that have no AC connection and run off a separate power supply, and are considerably cheaper than AC power models). I choose the ToolkitRC after trying several other brands over a long period. Thus 6 lipos are charged simultaneously, and as the article recommends I charge at 1C. So I hang around the workroom for 2 hours while the charging takes place. I always check individual cell voltages several times during balance charging, and the IR at least once. 

I keep welders gloves and a fire blanket handy, in the hope I could wrap up an igniting lipo and throw it into the yard in time. I have a fire extinguisher ready for other items that may have caught fire. And the room has a smoke detector. I do not pretend these measures ensure perfect safety, the aim is just to make it as safe as possible.

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  Using 2 aileron servos with a elrs rx that has 5 sets of pwm pins

Posted by: greggold
19-09-2023, 02:47 PM
Forum: General
- No Replies

The betafpv rx has 5 sets of pwm pins.
I have not used the betafpv rx with 2 aileron channels (I used a y-lead). However Florian is using this rx on his superextra with 2 ailerons plugged into the rx.

The number of sets of pwm pins is not the number of elrs channels, I set the number of channels to 8. When I run the elrs lua, I get packet rate 100 Hz full, telem ratio 1:32, switch mode 8ch, model match off. 

In the mixer you leave ch 5 empty, and set one aileron to ch 6.  This ch6 aileron then plugs into the 5th set of pins.

As a general rule, leave ch 5 empty in the mixer. It is the elrs arming channel, and arming is best managed with the same switch you use for throttle cut/throttle armed, using a special function entry.

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  2 New canopies for Trex 700

Posted by: rcpilot
18-09-2023, 04:23 PM
Forum: For Sale
- No Replies

2 Brand new canopies for Trex 700
These are made by Fusuno, nicely finished. for T-rex 700N. Will fit 700E as well.
They look similar but a little different color scheme.
Un used.
$60 each
Pickup schofields

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  Align 700M 510KV Heli motor

Posted by: rcpilot
18-09-2023, 04:14 PM
Forum: For Sale
- No Replies

Very Little Use excellent shape, Align 700M Heli motor 510KV
Currently running similar motor in my logo600 on 12s and it does an excellent job.

$60
Pickup schofields

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  Herr Cloud ranger Trainer plane **SOLD**

Posted by: rcpilot
18-09-2023, 04:02 PM
Forum: For Sale
- No Replies

Herr / Sig Cloud ranger. Kit built, in mint shape.

Details here.
https://www.htdirect.com.au/products/sig...-sighrr508

The plane, with motor, 30A ESC, Hobbyking servos x4, one 1300mah 3s battery.

Will make a nice aileron trainer, kit alone is $200

Selling for $150

If required, a MODE 2,  DX6i radio with receiver is also available for extra

Pickup schofields.

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  SOLD - Durafly Tomahwak FPV wing

Posted by: rcpilot
18-09-2023, 12:54 PM
Forum: For Sale
- Replies (1)

Selling a Durafly Tomahawk FPV wing.
Details here.
https://hobbyking.com/.../durafly-tomaha...mini-class...
Comes with motor, prop, ESC and servos.
$50 pickup from schofields    

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  ELRS telemetry

Posted by: greggold
15-09-2023, 12:01 PM
Forum: General
- No Replies

ELRS telemetry can cause confusion for flyers migrating from other RC equipment where for example RSSI is a percentage and a positive number. These 2 videos are useful guides to the differences in elrs telemetry.

One principle is that RSSI is better understood when you take account of your packet rate. When I run my lua script on my Radiomaster, it shows typical values for an airplane flyer:
packet rate 100 Hz (full) (-112db)
telemetry ratio 1:32
switch mode 8
Tx power 100mw (dynamic) 

Notice (-112 db) after the packet rate, that is the limit for RSSI, any lower will mean a failsafe. This limit is different for different packet rates. Bardwell recommends a buffer of around 10 db, so I set my RSSI warning for an rssi of -102.

Bardwell on RSSI
https://www.youtube.com/watch?v=LnWdIssBk-c

Bardwell on Troubleshooting Failsafes (using telemetry)
https://www.youtube.com/watch?v=s4EcxopG-Qo&t=700s

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