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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: FrSky Futaba Tx Module
23/10/2019 20:49:15

RapidRc appear to have a combo for £44.99 (DFT + V8FR-II) see: **LINK**

While needing a bit more effort to fit, the DHT will work.

The DFT (and DHT) are now listed on the FrSky site as discontinued.


Thread: Boddo's Biggles Biplane
21/10/2019 16:22:37

I read "Biggles learns to fly", but I think my paperback copy is no more, although I have a number of other paperback Biggles books. I do have hardback copies of " "Biggles Pioneer air Fighter", "Biggles of 266" and "Biggles of the Camel Squadron".

I don't have anything to compare it with, but I found the Cessna 150 quite easy to fly, I did my first solo on one!


21/10/2019 00:09:51

Did Biggles ever fly a BE2, maybe he did very early on? As I remember, he flew FE2s when first posted to the front.

Was that first book "Biggles learns to fly"?


Thread: XYH motors
10/10/2019 18:47:45

What problem with programming the Neuron did/do you have?


10/10/2019 16:10:49

My most recent electrification is a 60" span aerobatic model. I'm using a FrSky Neuron ESC with 8A, switch mode BEC. The BEC output voltage is programmable up to 8V. I'm using 4S lipo (two off 3000mAh in parallel). Since I use a FrSky Tx, I get all the telemetry data from the ESC (flight pack voltage and current, ESC temperature, RPM, and BEC voltage). It also has a programmable current limit.


10/10/2019 13:23:31

I think the Ripmax Quantum 55 is the same motor, have a look at pictures of it and see if it matches.


Thread: Jumper 4in1 module problem
08/10/2019 19:32:40

I just tried a jumper module. Set the dial to 15, then power on. After various red LED flashing is settles to a single flash periodically. Pressing the bind button, changes this to two flashes periodically, pressing again, changes to three flashes and so on up to 5 flashes, then back to one flash.


Thread: OpenTx "feature"!
07/10/2019 16:12:01

I think you will find the channel value is that BEFORE any output limits are applied as well.

Even if you set the output limits to, say, -70% and +70%, the channel value still goes to -100% and +100% (and beyond).


Thread: A Terrifying story
01/10/2019 23:10:39
Posted by Geoff Sleath on 01/10/2019 20:42:36:

The rule of thumb for maximum heart rate is 220 minus your age, so, in my case, 140. I have a fairly low pulse rate. When I was bored in meetings at work I'd check my pulse and it was always 52 - and that was in spite of (or perhaps because of) my 13 mile bike ride in from home. Even if I go flat out on the turbo now I can't get it over 150.

. . .


I have to lie about my age in the gym, otherwise the machines keep saying "heart rate too high" and reducing the work level! I'm quite happy at a heart rate of 160-170, and my resting rate is below 60.


Thread: S8R problems...
27/09/2019 23:37:14

Please confirm that when you do the "self check", you get the blue LED flashing, then the servos do a "dance", then you move aileron, elevator and rudder controls to their limits, then power the Rx off.


Thread: V8R4-ii Rx not binding
20/09/2019 15:42:08

You are carrying out the correct procedure. Make sure you are using D8 mode on the Tx and not D16 mode with just 8 channels.


Thread: S6r Rx downloads
13/09/2019 22:45:55

Actually, it was a "hack" by me for erskyTx, and was added to openTx somewhat later!

FrSky did provide me with the updating protocol information so I could do it.

When trying to update devices from the PC, it is best if you power the device from a separate, switched supply. Get the updating software to the "Finding device" stage, then turn the power on to the device.


Thread: D8R-11 plus Receiver and EU LBT firmware
12/09/2019 09:29:46

Yes, someone else tested it on a D4R-II, I don't have any myself. I added the option of a SBUS output on channel 4 for the D4R-II.


09/09/2019 23:50:38

For those wishing to use 'D' receivers, particularly with new "ACCESS" transmitters that don't support D8 mode, I've written new firmware for them that uses D16 mode. Details are here: **LINK**.

I test flew a D8R-II yesterday with this firmware and a Taranis plus. The Tx is still using "international" firmware (it is pre-2015). The 2 flights had no problems. This firmware actually supports both international and EU-LBT modes, and properly listens before transmitting telemetry data. You also have the option of using one of the servo outputs as a SBUS output.

Telemetry is still the hub protocol in to the Rx, although this is sent to the Tx in SPort data. I'm looking into being able to use the Tx and Rx signals, combined with a diode or transistor, to support SPort sensors.

Technically, D8 mode is no longer legal, for new equipment, in Europe, but is OK for equipment imported before 2015.


Thread: Cable tidy using sbus
29/08/2019 00:11:42

I have written a program that run on an Arduino Pro Mini, takes SBUS in and provides up to 16 servo pulse outputs, program and instructions here: **LINK**.

Take care if reducing the number of wires that the power and ground wires left are capable of carrying the current for all the servos/retracts in the wing.

If using two receivers, make sure only one one is configured to send telemetry. As an alternative to using links when binding, recent firmware on the X6R/X8R allows the channels and telemetry options to be configured from the Tx when binding.


Thread: Latest CAA Update
28/08/2019 17:22:36

Tim, I wondered that as well when I read (on the BBC site):

"One standard effect of proroguing - or suspending - Parliament is that legislation currently being examined by MPs falls away. "

So you may be correct that it will have to start again.


Thread: X9D+ 2019 or Q X7S?
26/08/2019 15:22:17

I'm very close to having this D16 firmware for D8 receivers fully working. I've started a thread on RCGroups where I'll be posting instruction and the firmware: **LINK**.

The initial configuration available will be:
8 servo outputs, Hub telemetry on Rx, and the option of SBUS on channel 8 instead of a servo pulse.
Failsafe is settable either from the Tx or by using the button on the Rx.
Both FCC (international), and EU-LBT fully supported (including a listen before sending the telemetry data back and not sending if the channel is occupied). You select which at bind time, it starts binding in the same mode as the last bind, but a press of the bind button swaps modes

Following a request, I've also added a "dual bind" feature. If you bind to one, Tx, then bind to a second Tx, the Rx remembers the details of the first Tx, while still only being bound to the second one. If you have the first Tx operating in bind mode when you turn the Rx on, it will re-bind to that Tx, no need to press the bind button. The details of the second Tx are then kept so you may re-bind to that Tx. At any time the Rx is only bound to a single Tx.

Changing to this firmware is "one way only" as the chip needs to be fully erased to be able to flash the new firmware, so losing the original firmware and bootloader.

I've tested in both FCC and EU-LBT modes with a Taranis, Taranis plus, QX7, and a X9Lite (ACCESS in ACCST mode). All work fine. I've still to do a full range check but on my drive at home the X9Lite was still working when I was 45 paces away (in range check mode) on the other side of the road.


Thread: Possibly going all electric, which motors should I use?
26/08/2019 15:08:03

What radio gear do you use? I ask as I use FrSky and have recently started to use the FrSky Neuron ESC. This provides all the telemetry data for the motor, such as voltage, current and RPM, as well as the possibility of setting a maximum current to protect everything.


Thread: Sennybridge jamming trial
22/08/2019 11:17:48

They don't mention the 868MHz band, I wonder if that is included?


Thread: Prop size and efficiency
19/08/2019 12:23:24

I'm curious as to what formula you used for the "Volume of air per rev (cubic inches)" value.

For a 7x5 prop you have 3023.35. I would expect the calculation to be 3.5 * 3.5 * pi * 5 (as in pi * radius squared * pitch) for which I get 192.42.

You appear to have used (3.5 * pi * 5) squared!

My understanding is you need to consider the velocity of the air moved as well as the volume (mass) moved. The energy imparted to the moved air is kinetic energy, so is 0.5 * mass * ( velocity squared). This means a larger prop of the same pitch as a smaller prop, but rotating more slowly, will move a greater volume (mass) of air, but with less velocity. The energy imparted to the air may then be less.

Calculating this energy for the 7x5 and 10x5 props for the first motor in your list, I find the 10x5 is only about 16% "better" than the 7x5, as opposed to about 53% from your spreadsheet.

For electric power, there are electrical losses, and these are mainly due to the current flowing, and proportional to current squared. Moving to a lower voltage, and hence a higher current is likely to increase these losses, and the extra loss may be more than any gain from a larger prop. Personally, I try to use a higher voltage with a lower Kv motor to reduce the current while driving a larger prop.


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