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Member postings for Martin Harris

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

Thread: Lipo disposal questions
25/07/2017 17:44:16

Interesting - the discharged cell's internal resistance must rise to a very high value very quickly to do that! I might have a play with an old pack sometime...

Thread: solar-lac paint not fuel proof? Help
25/07/2017 16:04:33

Unless epoxy based, air drying paints and proofers need at least a week - and longer is probably better - to harden properly. Just feeling dry to the touch is not an indication that the solvents have dispersed into the air.

Funnily enough, I've had better results with water based varnishes such as Falcon Skincrylic for fuel proofing when I've needed a quick result for my old combat models - these have been flown the next day with reasonable results although the finish might not stand scrutiny on a model where looks are more important...

Edited By Martin Harris on 25/07/2017 16:09:58

Thread: Lipo disposal questions
24/07/2017 19:07:55

Really Andy? Not unless the pack goes open circuit during the discharge. There's no harm in checking but if the lamp has progressed from bright through medium and then stopped glowing, there won't be any significant voltage. Even a single cell with any significant charge will cause the filament to glow noticeably...

(Crossed with BE's post)

Edited By Martin Harris on 24/07/2017 19:10:28

Thread: Proposed new drone legislation/registration
24/07/2017 18:56:51

There might be scope to include A certificate (or maybe BPC) holders as qualified members of an organisation? Tests are free and any BMFA member can take one at a local club (most are pretty friendly) or at an increasing number of events.

24/07/2017 18:36:41 Government-Publishes-Consultation-on-the-Safe-Use-of-Drones-in-the-UK

Thread: Lipo disposal questions
24/07/2017 18:24:27

I would put it somewhere fireproof and out of the reach of children and animals!

A car headlamp bulb will discharge a 3S LiPo at 4 or 5 Amps (use 2 in series for 4 - 6 S) so is a lot faster than most chargers and has the advantage that it completely discharges the battery rather than just down to 3.3V or so.

Once discharged, drop it off at the tidy tip.

Edited By Martin Harris on 24/07/2017 18:47:40

Thread: Proposed new drone legislation/registration
24/07/2017 16:03:48
Posted by KELL on 24/07/2017 15:47:04:

99% of aero modellers follow the rules and guidelines that are already in place. Criminals, terrorists and idiots will not. Nor will they apply for a licence, register a drone/airplane or make themselves none. They won't in person buy such objects legitimately from shops or vendors where they can be traced. In fact all this hype is a near jerk reaction to an over excited media. Shame it's got out of control. Maybe we should of had this topic a while ago.

We did!

Thread: FrSky X10 - Taranis replacement?
24/07/2017 13:49:07

I've seen and appreciated the doughnut radiation pattern countless times but theory and practice are different matters where many external factors must come into play. Back in my single aerial module days, I tried flying to extreme range and then pointing the aerial at the model where no effect was noticed - according to theory, my model was doomed!

I suspect far more incidents have been caused by damage to spindly aerials and co-ax feeders than by less than optimum orientation.

Thread: Proposed new drone legislation/registration
24/07/2017 13:37:00

To get back to BEB's points, I see no reason why we can't embrace new technology without disturbing existing custom and practice. If we feel the need to semi-automate our flying machines, there's no reason why we couldn't then comply with new legislation for those particular models.

But there again, is this not just as much about being an exercise to compartentalise our activities to enable commercialisation of the lower airspace and sell it to the general public as a responsible safety inituative?

24/07/2017 13:11:57

While you could pick pieces of the edges of Pete's definition, it's the nearest one I've seen to a simple and workable definition to differentiate between what we understand to be bona fide model aircraft and drones. I think we should get behind it and commend it to our representatives as the basis of a proposition to assist in achieving the published intent of EASA not to unduly affect our established hobby and sport.

24/07/2017 11:33:42
Posted by Biggles' Elder Brother - Moderator on 24/07/2017 10:57:37:

Oh dear - Luddism is clearly alive and well in some corners of the UK aeromodelling scene!

It seems to me that as a hobby we are extraordinarily good at excluding people and new ideas. I can remember;

"Electric power is not 'real' aeromodelling"

"ARTF's are not 'real' aeromodelling"

Etc., etc.,.....

For a technology based hobby it looks like some folks are surprisingly and frighteningly anti new ideas!

It's very sad in my my view that we can't come at things from the "how could we build this in and grow" angle, rather than the "how can we exclude this" approach that seems to be the default reaction of so many.

No doubt you will all shout at me now - true to form - pass the pitch fork and flaming torch! smile


PS Although promoted with FPV uses, unlike many having actually used the Eagletree Vector, I can tell you it has many uses beyond FPV. Most flights I've had with it are not FPV flights.

No need to shout at you BEB and we've usually been in accord on the majority of issues but there are many of us who don't see multicopters as being strongly related to our hobby of aeromodelling. By its very title, this suggests a relationship between full sized aerial vehicles and models depicting them. This can be as tenuous as simply having a lifting plane and control surfaces but there is still a strong relationship. Drones (and I make no apology for using the term) are a spin off of technologies developed for aerospace and other uses but are not models of anything - they are the primary subject.

Yes, they may use some of our model components and technologies but I suspect the majority of aeromodellers see them as a distant relation - some of us may toy with them but very few go on to make them a major part of their flying hobby. With the exception of drone racing, no aspect of drone operation other than initial set-up and development seems particularly suited to a fixed rural location typical of a model club operation.

This whole subject has come about because of easy access to the new technologies whip make drone operation accessible to anyone with a few Pounds to spare - no commitment to our hobby is required and drones are easily purchased by the curious, stupid or those with evil intent. I believe it is in our collective interests to distance ourselves from the classification and work to define the difference. We can continue to accommodate those aeromodellers who wish to investigate new technologies by providing a safe operating environment in a similar way as Wembley Stadium puts on pop concerts and motor sports events while retaining its identity as a football stadium for its core purpose.

In short, drones should not be seen as model aircraft - more as a separate but complementary hobby.

Thread: Pull-Pull Control Systems
24/07/2017 00:59:02
Posted by PatMc on 23/07/2017 22:11:23:

maggy tail_1.jpg

Well, what do I know? I would have expected that elevator crimp to slip at the first high loading but you've obviously proved me wrong...

It doesn't negate my own experience of slipping crimps when I've checked over clubmates' models though so my recommendation would still be to go with the looped method.

Swaged cable connections on full size do use the one pass method but always press both cable legs together to completely fill the space and lock the cables and crimp together under carefully controlled conditions rather than a best guess with a pair of pliers or side cutters:

Edited By Martin Harris on 24/07/2017 01:21:52

Thread: Servo horn needed
24/07/2017 00:07:54

What about one of the large blank circular ones that are often supplied with servos and seldom used - holes could be drilled at appropriate places and if needed, excess material removed to make a Tee.

Thread: Pull-Pull Control Systems
23/07/2017 23:42:45

Yours are obviously very successful Pat and made efficiently but I have seen the single pass method fail where people's techniques or crimp size selection is less than optimal. I have never seen one with the looped method slip so I'd recommend it to the average modeller - especially on something more highly loaded than a Magnatilla. The three wires passing through the crimp have a better chance of being "bound together" in my opinion.


Edited By Martin Harris on 23/07/2017 23:55:27

Thread: Destroyed Drone
23/07/2017 16:33:55
Posted by Alan Jarvis on 23/07/2017 15:43:01:


In our area the police will no longer take lost/found property or have any interest in it. It is for the finder to try and return it to the owner.

Interesting. I believe there's an offence along the lines of "stealing by finding"? Handing in property to a Police Station would be a reasonable way of avoiding prosecution but what would constitute a reasonable effort to try to locate the owner of lost property while holding it in safe keeping?

Edited By Martin Harris on 23/07/2017 16:35:33

Thread: Visiting the UK in September
23/07/2017 15:16:20

I thought that Keswick was in the Lake District...surprise

Were you suggesting that he pencil it in his diary?

Edited By Martin Harris on 23/07/2017 15:17:15

Thread: Destroyed Drone
23/07/2017 12:45:49

I hope this doesn't come over as being "holier than thou" but with the benefit of hindsight and detached thought, perhaps leaving it in the bus shelter wasn't a very responsible thing to do. A large drone will have a sizeable LiPo which could do some serious damage to a child that might abuse it.

Far better to hand it in to the police (with a warning of the possible dangers of storing the battery) or if that's inconvenient, at least notify them that you have it in safe keeping.

Thread: Some dumb questions that have never been asked apparently
23/07/2017 12:37:29

It covers you for liability arising from any legitimate modelling activity. It will not cover you for anything arising from an illegal act. I believe this means that should you deliberately try to harm somebody by flying a model into them as a weapon you're on your own but informed legal opinion would be needed if an insurer declined a claim because you were operating from land without permission, for example.

Thread: Destroyed Drone
23/07/2017 00:51:55

Select return to home? wink

Thread: Proposed new drone legislation/registration
23/07/2017 00:08:13

I did appreciate the subtlety of your observation, Pat. It's the idea of specifying a single distance rule that I was having a go at! Before someone points it out, I do understand that the present 500m distance is only a guideline...

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