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Member postings for Mike Blandford

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

Thread: Proposed new drone legislation/registration
10/02/2018 19:27:24

For information, the club field I fly from actually does have a NOTAM that specifies "large model aircraft" are flown from it up to a height of 1900 feet above mean sea level. Our field is between 100 and 110 m (328 to 361 feet) high according to the OS map contours. So currently, we may fly up to around 1500 feet above the field.

Personally I have had an electric thermal glider as high as 1200 feet, at which point it was becoming a bit difficult to see (7'4" span). Normally I don't go over about 1000 feet, but that day I hooked a very strong thermal. I needed a prolonged spiral dive to get it down to 800 feet, and when I stopped diving it shot back up and I needed another spiral dive to get it back down again.

I seldom find any thermal activity below 400 feet.


Thread: WOT4 Becomes Racing Car
08/02/2018 15:27:48

I'll ask a silly question - You were trying to take off into wind, not downwind?


Thread: Adaptors
30/01/2018 14:22:40

No thanks, done that in the past calculating MTBF values for electronic circuits and systems! Fortunately my wife (also a mathematician) did a lot of the work, for the first one, as I was busy programming on another project at the same time.


29/01/2018 19:29:44

Ok, so for two sets of connectors, I reckon you only need:

M1-F2 ( = F2-M1)
M2-F1 ( = F1-M2)
F1-F2 ( = F1-F2)
M1-M2 ( =M2-M1)

If you want M1-M1, use M1-F2 and M2-M1
For M2-M2, use M2-F1 and M1-M2
For F1-F1, use F1-M2 and F2-F1
For F2-F2, use F2-M1 and F1-F2

So, every time you add another connector style, you need just 4 adapters to the first original connector style, then chain using the existing adapters to other styles.


If you then want, say, F3-M2, use F3-F1 and M1-M2.

If you have N connector types (N>=2), you need just 4(N-1) adapters.


29/01/2018 10:55:44
Posted by The Wright Stuff on 29/01/2018 08:30:29:

The formula is:

Number of adapters = (2 x N)^2 - (2 x N)

where N is the number of types available.

The first term is the matrix of every type of plug/socket connected to every other type of plug/socket, with two genders per type. The second term is subtracted because we don't need M-F or F-M adapters for the cases where we are connecting the same type together (because you get back to where you started).

I think you have too many! For two sets of connectors I reckon you have:

M1-F1 (*)
M2-M1 (!)
M2-F2 (*)
F1-M1 (*!)
F1-M2 (!)
F2-M1 (!)
F2-M2 (*!)
F2-F1 (!)

So 16 permutations from your first term [(2 x N)^2], Those I've marked with (*) are the ones you don't need from your second term [2 x N], but the ones I've marked with (!) are repeats, just wired to "other" way round (M1-M2 and M2-M1 are the same adaptor).


28/01/2018 22:55:45

Rather than have adapters from everything to everything, why not just have the connectors with a couple of wires (colour coded and with tinned ends). Then, get what I call a "chocolate block" screw terminal block for connecting wires together. When you need an adapter, just get the two connectors (with their wires), put the wires from one into one side of the block and those from the other connector into the other side.

Then you have, almost immediately, any adapter you require.

I use this method, or an electronics, plug in, breadboard, to make all sorts of adapters as required. Just occasionally, when I find I need a particular adapter frequently, I will make up a dedicated one.

I make it that if you have 10 different, 2-way connectors, each in male and female, you would need 90 adapters, with my suggestion, you need just 20 connectors with wires. Using several "chocolate blocks" you could leave commonly used adapters made up, but quickly change if needed.


Edited By Mike Blandford on 28/01/2018 23:01:42

Thread: Need urgent help with my 9D Plus update
19/01/2018 22:15:44

No! The bootloader supports both flashing the firmware as well as reading/writing model data and reading/writing to the SD card.

In bootloader mode, when you plug in the USB cable you should see two hard drives appear on the PC.


Thread: Flying towards youself
16/01/2018 12:33:52

Possibly due to having flown full size gliders and power before I flew models, I found the "put yourself in the cockpit" was almost automatic and works really well. If you are "in the cockpit", then you just notice the left wing has dropped and correct it, regardless of which way the model is facing. There is no translation between what you see and the control you need to apply.


Thread: Spektrum DX10t
15/01/2018 11:20:21

I wonder why it seems to have taken 7 years since such an "auto trim function" appeared in the open source firmware, for it to appear on this type of transmitter.


Thread: Considering going electric - advice rplease
10/01/2018 11:20:54

If using 35MHz, do a range check (Tx aerial down) and make sure the controls work OK at various motor power levels. I flew electric on 27MHz (Astro 25 + 16 1Ah NiCds) perfectly OK, and flew a lot with 35MHz. The only problem I ever had was with a twin with long wires from the battery to the motors (in spite of extra capacitors near the ESCs.

The mode flew OK, but occasionally glitched. Changing to 2.4GHz did fix that.


Thread: Help needed with logic switches please
09/01/2018 22:58:58

It is saying 16 channels are sent by SBUS, but channel 8 is being used to send the RSSI value, so is not available as a control. SBUS carries all 16 channels, so 1-7 and 9-16 are all useable.


09/01/2018 18:15:04

From the manual of the XMPF3E:

"Channels: 16CH (8CH is RSSI) by SBUS to UART2 Rx of F3EVO"

So channel 8 is RSSI, but channels 9-16 should be present.

"Configurationof F3EVO . .
1. In the ports, set the UART2 to be Serial RX.
2. In the Configuration, set the Receiver Mode to be RX_SERIAL and Serial Receiver Provider to be SBUS, and
disable the RSSI_ADC Analog RSSI input.
3. In the Receiver, set the RSSI Channel to be 8.
For other configurations, please refer to the Cleanflight/Betaflight."

You should be able to get 16 channels, make sure you have you Tx configured to send 16 channels!

You may then not need this switch override!


Thread: Spektrum module for Taranis
05/01/2018 23:23:28

It uses serial data at 125000 baud, 1 start bit, 8 data bits, even parity and 2 stop bits.

You could have a read of this thread: **LINK**

and/or look at the code (open source) for either openTx or ersky9x to see the actual data format.


Thread: Turnigy Radio Sets
04/01/2018 10:19:01

The 9XR-PRO is only £38.33 at present from HK **LINK**. You will need a RF module, but the FrSky XJT is fully supported and the firmware on the 'PRO is ersky9x, providing full telemetry support.

Full manuals for the 'PRO are here: **LINK**, so you may look to see if you would like it from them.

While a bit more money, you might also consider the FrSky QX7.


Thread: Grandpas Great Escape
02/01/2018 15:33:41

My wife and I watched it.

After some web searching I found it at "Lytham St Annes Spitfire Ground Display Team", see: **LINK**


Thread: Unable to connect to transmitter after downloading software
31/12/2017 10:38:47

We are guessing you are referring to openTx, but what Tx are you using (X9D, X9D+, X7, X12, X10 or something else)?


Thread: Warbird Replicas Bf 109 club.
19/12/2017 17:14:24

A BF109 with a merlin is called a Buchon, built by Spain after WW2.


Thread: OpenTx - Questions and Problems
16/12/2017 23:05:53

OK, we need a few more details. Are you seeing a message like:

"avrdude.exe: error: could not find USB device "USBasp" with vid=0x16c0 pid=0x5dc"


16/12/2017 21:29:17

Is this a 9XR or a 9XR-PRO, I'm assuming the latter as the 9XR doesn't have a USB port.

The 9XR-PRO ships with ersky9x firmware, which you may upgrade to a more recent release.

When you plug in the USB, and then power the radio on, does the display show the bootloader is runnning, and two hard drives appear on the computer?


Thread: Legislation Proposal at last
10/12/2017 19:17:47
Posted by cymaz on 10/12/2017 14:28:49:
Posted by Mike Blandford on 10/12/2017 14:23:53:

A model aircraft is capable of flying (gliding) under full control even when not powered?


Yes,but that would exclude a decent scale helicopter sad

If the helicopter can do a negative collective, it should be able to autorotate under control to a landing.


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