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Member postings for MaL

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

Thread: Lidl Specials
16/10/2018 17:51:14

Write your reg number on a piece of paper and keep it in your wallet......not only will it help you out at Lidl but ​then when someone steals your wallet they will try for ages to use the reg number as your card pin.laugh

Thread: Plan protection
26/09/2018 11:04:25

I use a copy shoplaugh

Thread: 3D filament ?
26/09/2018 11:02:00

HK have quite a range now, hk_filaments.jpg

Thread: Are branded glues worth it?
26/09/2018 10:56:39
Posted by onetenor on 26/09/2018 04:35:39:

I've been using an unbranded Depron glue from Ebay?Amazon. Comes in a plain white tube and cheap as chips. Seems equally as good as Uhu etc Takes a bit of patience to search for it . Give it a go it's worth it.

This it?

**LINK**,

It seems to work well.

Thread: BMFA Website down...?
24/09/2018 19:23:04

www.bmfa.org works here....win 7/Opera 24/9/18 20:22 CET

Thread: Soft Switch - Hard Lesson?
23/09/2018 16:03:20

Why not fit a DPDT slide switch is series with the electronic on/off switch?wink 2 that way you could charge the batts in situ too....

where did I leave me coat......

Thread: NGH Petrol engine ,what the opionion on them
04/09/2018 13:42:30
Posted by Manish Chandrayan on 03/09/2018 03:08:35:

The 35 is fine, but I didn't have success with rear exhaust version and the supplied muffler gave me serious grief.

Just wondering if you had the rear exhaust piston fitted? Both the side exhaust and rear exhaust pistons were supplied in the box when I bought mine......

Thread: The Seagull has landed
04/09/2018 13:37:38

So...the starboard wing has 0.3 degrees of washout, so no problem there, but the port wing has 1.4 degrees of wash 'in'.. which is not good.

You seem to me to have 4 choices...

1. Remove the covering on the port wing and steam/ ammonia it straight(er), and recover it.

2, Redrill the mounting holes to give the port wing 1.7 degrees anti-clockwise rotation (increasing the tip washout and balancing the lift from both wings)


3. See if Seagull will send you a new pair of wings

4. Live with the port trim.... now you have straightened the tailplane has that cured the screwing out of tight loops?.. IIRC the one I had didn't take kindly to too much elevator, but was fine in big loops and inverted loops so I reduced the elevator travel. It still had plenty of authority when landing.

23/08/2018 15:08:06

As the wings swivel on the main wing tube and are fixed by two (plastic) screws that fit through each fuz sides perhaps you can 'introduce' a corrective adjustment by filling and re-drilling the holes in the appropriate direction?......

Thread: Servos that swing both ways!
20/08/2018 21:35:56
Posted by BackinBlack on 20/08/2018 20:47:57:

Referring to the OP, the servos being mounted "mirror image" is quite standard and produces opposing movement for the same input signal via Y -lead. No trick servos here.

That is true for the ailerons..but not the flaps...

Thread: EU. LBT
11/08/2018 10:45:08
Posted by Mike Blandford on 11/08/2018 09:33:10:

Does anyone know if DSMX does LBT, and if it doesn't, what does it do to be legal in the EU?

I'm not aware of a different version for EU and rest of the world use.

Mike

Edited By Mike Blandford on 11/08/2018 09:33:28

See top of page 2 Mike

Thread: Imax B6
04/07/2018 10:15:33
Posted by john stones 1 on 03/07/2018 11:58:56:
Posted by MaL on 03/07/2018 11:42:43:
Posted by john stones 1 on 02/07/2018 22:33:54:

ebay, I use these, been good and run silent.

Sorry John, but I would not be recommending that as a good PSU to use in this application.

This is a desktop PSU (and not a very good one at that judging from the feedback it receives from your Amazon link and Tomshardware.com). While it claims to be rated at 750 Watts you should note that that is the total power it is (possibly) capable of supplying and as it has +3v3, +5v, -12v and +5vsb otputs as well as the +12v one. The actual limit on this particular supply at +12v is 444Watts, or 37 Amps. This may, of course, be plenty for your charging requirements but it is worth bearing in mind that some desktop PSU's require some load to be placed on the +5v line in order to properly function ie regulate the voltages properly.

A far, far better bet is a second hand server power supply as indicated earlier as these are designed and built to a much higher spec, will be an order of magnitude more reliable than a cheap desktop PSU and are designed to supply just the +12v

Well I stand suitably chastised, I'll take my cheap psu n go charge a lipo for tomorrow, I know how Penny feels now. face 1

I'm not chastising you John.. I just stated I wouldn't recommend that power supply and outlined why.....

03/07/2018 11:42:43
Posted by john stones 1 on 02/07/2018 22:33:54:

ebay, I use these, been good and run silent.

Sorry John, but I would not be recommending that as a good PSU to use in this application.

This is a desktop PSU (and not a very good one at that judging from the feedback it receives from your Amazon link and Tomshardware.com). While it claims to be rated at 750 Watts you should note that that is the total power it is (possibly) capable of supplying and as it has +3v3, +5v, -12v and +5vsb otputs as well as the +12v one. The actual limit on this particular supply at +12v is 444Watts, or 37 Amps. This may, of course, be plenty for your charging requirements but it is worth bearing in mind that some desktop PSU's require some load to be placed on the +5v line in order to properly function ie regulate the voltages properly.

A far, far better bet is a second hand server power supply as indicated earlier as these are designed and built to a much higher spec, will be an order of magnitude more reliable than a cheap desktop PSU and are designed to supply just the +12v

Thread: Compton Abbas takeoff
02/07/2018 12:20:00

One of my favorite small airfields in X-Plane, and I thought it quite tricky to see the airfield from the east with so many woods and copses around. Many interesting places to visit along the south coast and IoW. Wish I had been lucky enough to have been able to do it full size.....

Thread: The Seagull has landed
17/06/2018 14:22:21

You are lucky, I also used the pinprick holes as a master for the cowl fixing screws.....but found out that the pin prick hole went into balsa and missed the block by 3mm... Grrrrrr

Thread: Hot wire cutter power supply
17/06/2018 14:11:21

Secondary. For all the reasons above do not fit it to the primary (also because the primary is AC). You will also need to rectify and smooth the secondary to produce DC.

That is the same DC motor controller I linked earlier.

I have always used nichrome for the resistance wire so wouldn't know if half an amp is enough when using welding wire.....perhaps it will be for a short bow.

 

 

Edited By MaL on 17/06/2018 14:13:04

17/06/2018 13:07:24

He is operating the transformer out of spec in a potentially dangerous manner and I would suggest you do not do the same. Use a FET motor controller that uses a variable mark/space 555 to control the power supply output power as linked above.

google transformers and non-sinusoidal waveforms? to read about the subject from people that are eminently qualified to comment...not just from a blogger.

16/06/2018 16:48:55

In my day a lighting dimmer was wired between the line and the bulbsmiley... if you are talking LED PSU's being driven by a LED dimmer then they are designed to deal with the abuse, but good luck finding one that will deliver enough current to drive a hot wire cutter. Normally I think high current transformers should not be used with a chopped up waveform and definitely not with an inductive load (not that in this application the load is inductive).

When I built a PSU for use with a hot wire cutter I used an old PC power supply to provide the +12Vdc and a variable volts regulator to adjust the voltage (and hence current)to the required value that gave me the right wire temperature... something like this would be the modern equivalent

**LINK**

If you wanted something with some form of temperature feedback then perhaps going the arduino route with a thermistor and an external MOSFET switch board like this -

**LINK**

16/06/2018 16:09:54
Posted by Nigel R on 16/06/2018 15:00:33:
Can you put the dimmer on the mains side of the transformer? Fairly sure this would work ok.
I seem to remember that fitting a dimmer on the input to a transformer is a No No as the dimmer chops up the sinusoidal waveform which screws up the power loading of the transformer.

Thread: The Seagull has landed
16/06/2018 15:58:49
Posted by Gary Manuel on 15/06/2018 20:36:13:

gwm_1751.jpg

I used the tangs in this former to fit a retaining elastic band behind the tank on mine to prevent it sliding backwards, this makes it easier to remove the tank should it become necessary.... at least that's what I thought.

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