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Member postings for Jonathan M

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

Thread: Chris Foss Phase 6 Build
16/03/2019 08:36:51

Well done Paul!

Very reminiscent of the Middle Phase (aileron wing version) build I completed a year ago as my first proper balsa kit - hugely enjoyable process (both the build and blogging it on here) and a very good soarer despite its semi-symmetrical wing limitations. I did briefly consider a Phase 6 as a follow-on build, or even a Phase 5 from plans, but decided in the end on a Quark 2 slow aerobatic (for which I'll do a build blog on here once I start later in the Spring).

Enjoy maidening the fruit of your own labours!

Thread: Help - Middle Phase Recomended Throws & CofG?
01/03/2019 14:09:40

Spec CG is 62mm aft of LE, but I moved mine back temporarily to 75mm to see how it flies and how much the original elevator up-trim might be reduced - only a bit.

Inverted flight is perfectly feasible but isn't great (its only a semi-symmetrical wing after all), although adding some snap-flap mix makes some difference, as has moving the CG back. I expect the design CG is quite forward as befits a RE trainer, but this shouldn't stop you experimenting with a more rearward position especially if you're flying with ailerons.

The travels are exactly as Robert quoted above.

Thread: Acrowot build
26/02/2019 07:02:38

**LINK** or **LINK**

Thread: Electric setup advice
18/02/2019 20:19:20

Will, you might have already sorted the throttle situation, but if you haven't (or if anyone else is a first timer with electric), then read the ESC instructions and set the throttle up exactly according to them, which - as has been noted above - usually means first setting the throttle stick travels to their default 100/100 on the transmitter, then programming the ESC for that range by moving the stick to the limits down and up (read the instructions).

I recently didn't do this properly and got into a mess trying to adjust idle and high-speed using the travels.


Thread: Acrowot build
16/02/2019 13:57:07

For construction generally I’d use Aliphatic Resin - dries quicker than PVA and is relatively easy to sand.

I’d use Poly-C for the bandage: **LINK**

If you do use epoxy for localised strengthening of components, then make sure the joining areas are well keyed (roughed up) first, and the slower and more liquid the better for maximum penetration. If the epoxy is to fill an area, then thicken it with filler when mixing.

Thread: One receiver different models
13/02/2019 08:21:57
Posted by Mark Howard 1 on 13/02/2019 07:13:19:

Swapping the Rx between models almost certainly means a complete new setup in terms of end points, servo throws, rates, stabiliser setup (where used) etc. There's certainly more changes required for a multi-channel glider over an electric 4 channel model but a complete new setup is required either way.

No. All these things are in the TX's model memory - a standard template for a given RX gets copied to individual model memories, whereafter the settings (servos, rates, expo) can be customised to suit each model. The RX is just a dumb airborne slave which obeys the signal transmitted, without ever being aware of the settings behind them. The only thing that you'll have to do is re-bind the RX each time, and ensure that servo leads always go in the same output sockets (e.g. R-Aile->Aile, L-Aile->Gear, etc) whichever model you're flying.

If I were to go down this route, then I might have two RXs, say a 6-chan for power models, a 4-chan for slope soarers, but things would get complicated if you start having models with retracts, gliders with 4-aileron wings, or other more specialised models.

As the RX is usually a small proportion of the overall cost of a model, at £25 a pop for FrSky receivers each of my models gets its own slave.

Thread: Acrowot build
12/02/2019 13:23:06

Good points KC.

Re the U/C, perhaps the nylon-bolt solution is only really applicable to the ARTF version, but less so on a more robustly made kit?

On my ARTF, before I switched away from the steel bolts supplied, a bloody great mole hill reared up right in front of a dead-stick landing - ripping off not just the U/C but the whole of the underside section to which it was bolted! In the several later occurrences of rough landings where the nylon sheered (sometimes just one side only), scarring of the tail didn't happen, but would have been a very minor price to pay compared to a nose-area rebuild.

12/02/2019 11:56:22
Posted by Stephen clarke 3 on 12/02/2019 10:16:54:
Thank you all as I'm new to building but it's the kit acrowot and not the artf. I'm putting a os 55 ax 2 stroke in. I'm just confused as to where the engine mount is positioned. Thanks

I will post pics of what ive done already at the end of this week. All advice and guidance is much appreciated

That would be of interest - I lost my own ARTF AW recently and am thinking of a kit version for the engine that survived.

I'd still be inclined to use nylon bolts for the U/C.

Thread: Hi everyone
11/02/2019 20:48:11

Way to go Will - all three - well done! yes

Thread: Catastrophe!
11/02/2019 19:34:33

Hi Paul, thanks for that!

Yes it was Al's. Spoke to Ali a week ago, sent the TX by post, then Gary (who works Mondays) did the test etc, and it is now back in the post to me. So would say very good service.

11/02/2019 18:39:27

TX inspection results now back, which showed one 'hold' of my DX7 during an hour-long test. (Duration of the hold in the workshop test isn't known, but a 'hold' is the most significant of three possible events, the other two being 'frame-loss' and 'fade'.) The RF board has been replaced and the transmitter has tested as now working without fault.

I asked the tech guy whether low ambient temperatures might have increased the likelihood, frequency or duration of a 'hold' or other signal failure event (it was marginally above freezing on both days when I lost models) and he replied that he has known radios to misbehave around or below zero degrees.

I'm therefore concluding that the primary cause of both crashes were due to this fault in the transmitter, possibly exacerbated by very cold weather.

NOTE: This post isn't a cue for any people carrying deep-fried potatoes on their shoulders to start whooping and cackling again online. If it runs to that, then I'm going to ask the mods to lock the thread. Thank you.

Thread: UK supplier of balsa in METRIC thicknesses?
11/02/2019 10:29:25

All good advice, thx. (I did previously enquire about attitude-reassignment procedures but the NHS is a bit stretched at present and going private would wipe out my lifetime budget for the hobby!) In the meantime...

- Mantua carry all the usual metric thicknesses (in 1000mm lengths I need for each wing) but it'd be a three hour round-trip to go in and select for density.

- SLEC machine all their own balsa and can cut to an emailed materials list - will see what this costs compared to buying stock Imperial sheets etc.

Will be doing a separate build-blog in due course. The model is a Quark 2m slow-aerobatic soarer.

Got the last one: **LINK**

Prototype here: **LINK**

Edited By Jonathan M on 11/02/2019 10:33:14

10/02/2019 19:54:04

Thanks guys. I'm happy working with both systems, and the problem only arises in certain cases such as this one.

In my day-job I sometimes work with hardwood to plans which are always done in Metric. So if I need an oak component to be exactly 25mm thick, then I buy 1-1/4" or 1-1/2" rough-sawn, which is almost always about 1/8" thicker (whether by law or by custom I'm not sure?) than its nominal size - and the board will always be to varying degrees bowed, cupped and in wind (twisted). Then I machine the board down, usually in two stages: the first after roughing out the component oversize to allow it 'stretch' and settle for a few days after being released from its long captivity inside a dried longitudinal slice of tree, then to final thickness plus a smidgeon to allow for hand-planing, scraping and sanding.

But in the case of this short-kit (from a French designer based Ireland as it happens, with international carriage and a lousy exchange rate) which has laser-cut ply and balsa components notched out for exact thicknesses (e.g. wing-spars, inner leading edges, etc), I have no suitable kit to machine balsa - the 3-phase thicknesser would make mincemeat out of a soft and floppy sheet! The choice then is either to find a supplier of exact metric thicknesses in the densities I'd prefer, or buy Imperial in the next size up (from Balsa Cabin or SLEC who both enable choice of density), then thin down components by hand or using a router-jig. But this would be tedious and inefficient, and would begin to make my hobby resemble my day-job! Or just bodge it... which would probably suffice but would annoy me!

10/02/2019 11:20:22

Need to order a complete supply of sheet and strip balsa for my first short kit, a 2m slope-soarer, which has been designed and laser-cut in exact Metric. Some stuff can be the usual Imperial equivalent (e.g. wing sheeting can be 1/16" rather than the exact 1.5, etc) but some needs to be spot on to match laser-cut parts (e.g. 2mm, 5mm, 10mm).

Is there a UK supplier that does the Full French - including the ability to choose light/medium/hard densities?


Thread: Gangster 75 Build Blog
10/02/2019 10:58:15
Posted by Peter Jenkins on 10/02/2019 09:53:09:
...I settled on Futaba 3003 servos for the flying surfaces and 148 for the throttle. The fully charged Life 2S produces about 6.7 v and in my Majestic has not proved a problem with Futaba servos.

Cheers for that Peter - good to know as I'm got sets of Futaba 3003 and 3001 servos in each of the two models I've bought 2s LiFe packs for.

10/02/2019 09:24:47

Looks great! Wishing you fair weather for the maiden yes

If you discover that you really need more than 1" clearance (heavy landings?) then you could always fit bigger wheels or a taller U/C, or else simply rotate the pipe 45° to point in the correct direction for equivalent down- and side-thrust when opening up full revs.

I can now see why you needed the extension lead for the LiFe balancing-plug. By the way, are you using high-voltage servos or a BEC to step down the voltage for normal ones, or not bothered by this?

Thread: How can I reverse a plan to build two wing halves
08/02/2019 21:01:52

The mess-free method...

During daylight, tape to a large window and trace in pencil onto the back.

Use a 0.5mm propelling-pencil to mark accurately the outlines and at the junctions of each component, then you can use a normal pencil to roughly sketch in the rest so it all makes quick visual sense.

[back-to-front smiley]

Thread: Which was the best decade for the hobby?
07/02/2019 19:31:47

The answer - for me - has to be the present, or if you like the current decade.

I have a fabulous choice of stick and tissue FF plans from pre-War to the present which I can download and build from balsa ordered online (and a far greater range of other materials and equipment that a single model shop could ever carry), I can put together a 2-stroke classic pattern ship from a modern laser-cut kit, or stay old-school and build a trad Chris Foss aerobatic for 4-stroke or a similar era slope-soarer, or very quickly assemble an ARTF and bung in my own RX, plus I can benefit from very high-tech materials and extraordinary electronics and TX programming by way of a current DLG design or moulded slope-soarer.

On top of all this, there are superb resources and knowledge-bases online, enabling learning and communication that simply didn't exist when I was converting a Keil Kraft SE5A (from Henry J Nicholls on the Holloway Road) to Telco CO2... surprised it actually flew!

kk se5a 3 copy.jpg

Edited By Jonathan M on 07/02/2019 19:33:20

Thread: Doubler mistake
07/02/2019 14:56:40

Will it convert to control-line..? wink

Thread: Gangster 75 Build Blog
07/02/2019 14:52:32

That makes perfect sense Peter - where there's a quickly removable hatch or normally take wings off a bigger model. I suppose I was trying to visualise a solution for a smaller model (like my 60" Middle Phase) where I don't usually have to unscrew the wing bolts to transport or charge. Necessity (howsoever self-inflicted!) being the mum of invention, this now prompts the devising of a wee sliding hatch beside the main switch/port for the for the balance-lead extension.

Look forward to full HD footage of your big Gangster in the air! laugh

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