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Member postings for Malcolm Holt

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

Thread: Futaba 14SG chat
14/07/2019 21:16:47

I suspected that might be the case. Glad you find the book helpful.

14/07/2019 16:58:28

Check the Model Type menu. What is the wing type setting?

10/07/2019 13:57:04

No need to remove the back. Pages 17 and 18 of the Futaba manual explain how to adjust stick tension.

Basic installation and mechanical matters such as this are pretty well covered in the official manual so, as the title indicates, my book deals specifically with programming.

Thread: Futaba T14SG chat
27/04/2019 11:39:05
Posted by Braddock, VC on 27/04/2019 10:20:36:

I have a problem with the engine cut and idle down facility.

I suspect it's my own fault but it only seems to happen when the throttle servo is reversed.

I've checked on my kindle copy of malcolm's book but it doesn't switch my light on (or cause my penny to drop) any pointers gratefully received.

Reversing the throttle channel should not make any difference. The only thing I can think of is that you might have adjusted the Limit Points on the throttle channel at some time and they are blocking movement in one direction.

Go to the End Point menu. The Inner values (100 by default) determine the throttle servo travel so you have probably adjusted these to give the correct tick-over and full throttle positions. The outer values should be left at their default 135 to allow the servo to move beyond its normal travel and thus permit idle down and throttle cut. You might even have to increase them to permit sufficient movement. Have a look at the Throttle Cut section of my book which explains this.

In the Throttle Cut menu the default position value is 17%. Change this to a smaller value such as 5% to cut the engine.

In the Idle Down menu the default Offset is +0%. Change this to a higher value such as +50% to lower the idle speed.

If you are still having problems can you please explain in a bit more detail exactly what is happening.

27/04/2019 11:10:52
Posted by SR 71 on 27/04/2019 09:02:04:

I have the 14 sg bought it shortly after it came out

It has never been updated as im completely computer stupid

Am I missing anything of importance by not upgrading it

Thanks Tony

Start by checking your current software version. You will find it under System Menu - Info. Then go to the Ripmax web-site. Select Futaba Radio software upgrades under Important Links on the left and then select T14SG from the list of available transmitters. You will then be able to download the manual for each upgrade. The first part of each of these explains how to do the upgrade but this is then followed by a list of the improvements made. (Don't be put off by the word manual. In most cases it is only two or three pages and you can ignore the first part).

There have been some very significant improvements made over time but only you can judge whether they are of any use to you. That said, if your transmitter has an SD card and you have access to a computer with a card reader, the upgrade process is quick and easy. There is little to lose by upgrading subject to the proviso in my post above.

27/04/2019 10:56:55
Posted by Robert Armstrong 2 on 26/04/2019 20:19:24:

Help

I have a 14SG on version 6.0 software. The Ripmax site shows version 8.0 now out. Can I update direct to v8.0 or do I have to go through v 7.0 first? Would like to avoid two steps if possible.

You can go straight to Version 8.0 but note the following.

Some owners of older non-Futaba compatible receivers (e.g FrSky) reported problems when they upgraded to Versions 7 and 8. I don't use these so never paid much attention to the discussion. If you have any older non-Futaba receivers I suggest you check on-line or seek advice from Ripmax before running the upgrade.

Thread: Futaba 14SG chat
03/04/2019 21:44:46

I am not familiar with this stabilizer but what is often required is a toggle switch which allows you to select three different modes of operation and a proportional control (usually a dial or slider) which allows you to adjust the gain from zero to maximum. This is exactly what the setup you describe provides.

You have assigned SG as the control for AUX1 on channel 7. If you check the servo monitor you will see that the three positions of the switch deliver -100, 0 and +100 and these values appear to be what is needed to switch between the stabilizer’s different modes. This is normal. There is no ON/OFF icon because SG is not operating as a switch in this situation. It is simply controlling the position of whatever is connected to channel 7. If you had assigned a stick, the servo monitor would show proportional movement between -100 and +100. Because you have assigned a toggle switch it can only output three positions. You can reverse the operation in the Reverse Menu but otherwise cannot reconfigure the operation. However, as all is working, you do not need to and need not worry.

Similarly you can check the operation of RS in the servo monitor. It moves the “Gear” channel proportionally from one extreme to the other and should adjust the Gain perfectly. Again you can reverse its direction if you wish but it appears to be working fine and you have nothing to worry about. (If you allocate a different function to Channel 5 RS will still work but you will need to re-allocate it in the Function Menu next to the new function).

In summary, as long as you check very carefully that everything on the model is working correctly before you fly, you should have nothing to worry about.

The difference between using a toggle switch as a control in the Function Menu and as an ON/OFF switch elsewhere causes a lot of confusion. If you want a bit more explanation have a look in the introduction to my 14SG book. You can read it here for free.

https://www.amazon.co.uk/dp/B00BMM9J7A    (You will need to copy and paste)

Click on “Look inside”, scroll down to the Menu and click on “Controls and switches”

Edited By Malcolm Holt on 03/04/2019 21:49:02

12/01/2019 18:31:46

Just occurred to me. Do you mean 30 degrees?

12/01/2019 15:56:55

Yes, the exponential is working as it should.

I can't help but ask why you are only using 30% throw on the aileron servos. This places a much higher load on them and reduces the resolution. Can't you achieve the required throw by moving the connections to the horns and servo arms?

11/01/2019 16:25:06

With the exponential set to -90, move the aileron stick from its central position half way to the right while watching the amount of aileron movement. Now move it from the half way position to fully right while again watching the aileron. The amount of movement in the first case should be less than in the second. What happens on your model?

10/01/2019 16:29:14

You only need to assign a switch if you want to be able to switch between different rate and/or exponential settings. If you simply wish to add exponential to a model without an aileron rate switch you should remove SA by re-setting it to --.

Now go to the two EXP settings and, as noted above, set NEGATIVE values of your choice such as -20.

If you want to use more than one rate and/or exponential then leave the switch assigned. When SA is UP you will see the black arrow next to the number 1 (First rate). Any rate and exponential settings entered on this screen will apply when the switch is in this position.

Now move SA fully DOWN. You will see the arrow move to number 2 (Second rate). By default, the rates on this screen will be 100 and the exponential will be 0. Change the rate and/or exponential values to those you require for the second rate setting. You might, for example, want the rates reduced to 70 while maintaining the exponential at -20.

Finally, doing this without the model is absolutely fine. That’s what the servo monitor is for and, as it gives precise values, you can sometimes get a clearer picture of what is happening

Thread: Laser Engines - Technical questions
07/01/2019 11:45:49

Andy, the Spacewalker is 5.9 kilos (approx. 13 lbs).

05/01/2019 18:46:31

Andy, FWIW I have a 150 in my SIG 1/4 Spacewalker and the power feels about right. That said, being somewhat long in the tooth, mine is covered in nylon and then painted so is probably a bit on the heavy side.

08.jpg

02.jpg

Thread: Futaba T14SG chat
08/11/2018 13:47:55

Because of the mixing capabilities of the transmitter, a servo can be operated by more than one control simultaneously. For example, the rudder is under the direct control of its own stick J4 but, if an aileron to rudder mix has been programmed, it will also respond to movements of the aileron stick (J1). These effects are cumulative so, if both sticks are moved simultaneously, the servo could be driven to a point at which it stalls or damages the linkages. To prevent this, the Limit Points set the maximum amount the servo can move regardless of the number of mixes affecting it.

In the above example, the limit points could be set as follows. First set the Limit Points (135) to their maximum (155). Now hold the rudder stick fully right and increase the right TRAVEL value. The rudder will move further outwards and the servo will eventually begin to buzz in complaint. Make a note of the TRAVEL value at which this happens. Set the right LIMIT value to a slightly lower number to give a margin of safety and reset the TRAVEL value to its original setting. Now do the same for left rudder.

18/05/2018 07:12:47

Hello Maarten,

If I remember correctly, when FASST LBT was introduced there were issues with some other-brand compatible receivers. Whether these have been resolved I do not know but, if you are not using Futaba receivers, it is probably worth checking with the appropriate manufacturers.

Personally I have never had or witnessed a issue with a Futaba FASST transmitter but, statistically, my experience is insignificant. Thousands of these transmitters are in use. A handful of posts is similarly insignificant.

Thread: Futaba 14SG chat
26/04/2018 19:05:22

Posted by Adrian Smith 1 on 26/04/2018 18:20:37:

Hmmm....... there is an S.bus socket on the rx, but I would imagine that’s a no, no?

S.BUS is fine but you initially said you wanted to avoid having to buy extra kit.

26/04/2018 07:07:58
Posted by Tom Sharp 2 on 25/04/2018 23:41:53:
Posted by Adrian Smith 1 on 25/04/2018 20:11:34:

Ok this sounds like a dumb question, but do I say, slave 1 to 6 and 5 to 8 to achieve this end? Or is this over-complicating it? Also where do I plug the RX battery power source as I have used all 8 CHs? Sorry if I am being a bit thick! Thanks.

Y lead on any channel.

In the Model Menu, select wing type as 4AIL+2FLP. You will then see AIL, AIL2, AIL3 and AIL4 in the Function Menu. You can reassign the two Flap channels to Motor and a second elevator and then connect each servo to its own socket in the receiver. This will enable you to adjust the travel and sub-trim of each independently to achieve the best setup.

As Tom has explained above, to use a separate battery to power the receiver and servos you can connect it to any channel via a Y-lead. You will, of course, need to consult the speed controller’s instructions to see how to use it with a separate battery. Although I know how some people do this, I don’t fly electrics so am unwilling to offer advice on this part of your setup.

25/04/2018 19:59:21

The R7008SB is an eight channel receiver without using S.BUS. You still have channels 5 and 8 unused. Why not use them for your other two aileron servos?

25/04/2018 18:46:29

How many channels do you need in total? It would help if you could list what each is to be used for.

23/01/2018 11:19:16

Denis.

Yes, the throttle cut does the job and is the familiar option to most users. The point about the Futaba 14SG is that it offers the alternative of the Motor Function with a safety switch. Both achieve much the same result but the difference lies in what happens when you switch on the transmitter.

With the Motor safety switch, the transmitter sounds a warning when you switch it on if safety switch is OFF. It will not transmit until you engage the safety switch or deliberately choose to override it. The Throttle Cut works the other way round. It sounds a warning if the Throttle Cut (safety) switch is ON. It will not transmit until you turn the safety switch off or deliberately choose to override it.

​As said previously, there is no right way. Personally I prefer the Motor switch as it offers an additional layer of safety but at the cost of slightly more complex programming. However, I think that the most important thing is that people should use the setup with which they feel most confident.

​Adrian

Stick with the Throttle Cut for now but, if you want to experiment with the Motor Function, there is an illustrated step-by-step guide in the appendices of my book. Create a new model on the transmitter and check out how it works.

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