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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: Insurance costs
06/04/2020 20:10:56
Posted by kevin b on 06/04/2020 19:16:43:

Theft from home. Can be covered on household policy.

Theft from car. Need to check with car insurance on contents cover.

Theft from anywhere else. Not available.

According to my insurer, as a specified item away from home, under my home insurance my transmitter is covered for theft with the exception of from an unlocked car.

06/04/2020 19:04:53

Accidental damage? I doubt you'd get it but house insurance may cover theft - but you'd need to check with your insurer. My transmitter is covered as a specified item in and out of the house.

Thread: Benefits of the lockdown
06/04/2020 17:43:22

If you have a smartphone, Whatsapp is very good and I feel it has less potential to expose you to fraud from revealing too much information publicly. You can communicate individually or in groups - as well as being able to communicate with family and friends, my club has an active group of like-minded friends who continue the club banter on-line.

Posting pictures and videos is easy - for instance, we had a winter build programme where numerous Peter Miller Ohmens were built by both experienced and novice builders and it was a great way for the beginners to ask questions and get guidance with pictures of their problems and solutions readily exchanged.

Edited By Martin Harris on 06/04/2020 17:47:15

Thread: Liability of Open Source radios
06/04/2020 15:03:05

I can't claim any legal expertise but the guiding principle seems to be what a reasonable person could be expected to do. While flying with a known problem could be held to be negligent, an unintended consequence of mixing and matching or home built/programmed equipment which has been tested reasonably before flight shouldn't lead to any accusations of negligence or culpability as far as I can see.

Thread: Another newbie asking for help
06/04/2020 14:55:50

Hello Andy,

This is generally a pretty friendly forum but it's not particularly helicopter orientated although there are a few who take an interest. The usual advice would be to seek out a local club or enthusiast and get together with them to guide you through those initial stages - not something that's currently an option!

Spares seem to be available (e.g. here) but I think that you may get more meaningful help from those with relevant experience if you post some pictures of the damage.

Thread: Control Horns on larger models
05/04/2020 20:19:45


Edited By Martin Harris on 05/04/2020 20:21:01

Thread: Light Relief
05/04/2020 17:01:01
Posted by Chris Walby on 05/04/2020 14:36:47:

Well a bit of everything and even a twin allowed to join the flight!


23 minutes of something for everyone, superb.

Bit over-generous with the primer on the Mossie's port engine?

Great quality video - and what a collection!

Thread: Laser Engines - Technical questions
05/04/2020 12:39:50

If I might make a suggestion...

It sounds like the camshaft has seized into the outer bearing (the end float being until the cam gear hits the outer follower) so if you can get the cam followers to drop out then you should be able to remove the cover complete with the camshaft. If you haven't already done so, remove the cylinder head and pushrods and hopefully knocking the inverted crankcase on a block of wood will allow the followers to float free of the camshaft. A strong magnet might help to get them moving if they're sticking but it's the outer one that is important to move out of the way.  You will not actually need to completely remove them - if the heads are level with casing there's more than enough clearance.

If it's seized as I suspect then it may well be caused by rusting in the bottom end so a complete stripdown will make things easier and you'll probably need to do it anyway.

Edited By Martin Harris on 05/04/2020 12:56:06

Thread: Making Steel Fittings. Question.
03/04/2020 21:28:35


Thread: Focke Wolf Ta 154 Laser
01/04/2020 15:24:47

It was those "rare spacers" that I was wondering about - what's their function?

01/04/2020 13:01:12
Posted by Chris Walby on 31/03/2020 21:07:26:

20190526_205847.jpgPS Not engine or tank final position!

What's the story with the engine mounting bolts, Chris? Is there some sort of flexible mounting going on?

Thread: Flat Car Battery from non-use of car
01/04/2020 12:47:23

Assuming that like most people on this forum, you have a multiple battery technology charger for model use that runs on 12v, you could charge your car battery on a Lead-Acid program using those LiPos as the power source. Much kinder on the cells, terminations and cabling than using them to jump start although I have heard of people using them in this way for emergencies.

Thread: Does the size of spinner effect prop performance ?
31/03/2020 19:22:54

Little or no sign of performance issues during 1/12th scale combat bouts with this - however odd the prop looked. No the tips are not concealed by the grass!


7"x5" prop to comply with combat rules for the .15 engine and a 2 3/4" spinner to conform to the scale outline of the fairly little known Me309 which I "designed" when looking for something a little more individual than a Spitfire to use for competition...

Thread: Vibration absorbing engine mounting
30/03/2020 13:28:57

Full size propeller driven aircraft often have "avoid continuous operation" rpm ranges due to harmonic vibrations so it can't be an easy fix to eliminate them, although changes in propellers can shift them to different rpm bands - one often overlooked reason why a prop change can have a dramatic effect on noise testing.

Edited By Martin Harris on 30/03/2020 13:35:17

Thread: Low wingers,very twitchy,recommend expo.YES/NO
27/03/2020 14:47:32

An interesting snippet in a video I've just been watching on the design philosophy of the FW190 - there was mechanical expo built in to the control circuits of all three axes. Watch from about 19.30 if you're interested...

Somehow, I missed the last responses to this thread - to make it clear, I was referring to movements and responses within the "normal" range and how I felt that there might be a possibility of less linearity than on full size at our low Reynold's numbers.

Thread: Wanted parts for Enya 90 and 60 FS engines
26/03/2020 23:22:27

The smart answer is because they can...but I think you're lucky the handling charge was only £8 as I've heard of much higher handling charges. The justification is that they have to manually remove the package from the largely automated system for Customs and Revenue to do any necessary checks and administer the duty payments on their behalf but it does add a lot, especially where the value is relatively low.

Edited By Martin Harris on 26/03/2020 23:24:28

Thread: Can I or can I not fly?
24/03/2020 19:11:34

While I get an immense amount of pleasure flying my models, a large part of the experience is in interacting with other members, helping out where possible and exchanging banter. I'll certainly miss my flying but this crisis is so much more than just an inconvenience and I'm just hoping that by abiding by the Government requests, instructions and no doubt soon laws, all of my clubmates will still be around when we finally get on top of this.

Thread: SC 52 2t
24/03/2020 10:34:09

Just after 10.30

24/03/2020 10:29:19
Posted by john stones 1 on 24/03/2020 01:25:40:

My word Cymas, those are noisy, you considered going lecky ? devil yes

Try turning your volume down John! cheeky

Thread: Laser Engines - Technical questions
23/03/2020 19:13:00
Posted by Ron Gray on 23/03/2020 18:37:14:

Hi Tim, I use the HD one from Just Engines with an old 6s (well 5s as one cell is dead) to power it. No problem turning over any of my Lasers or my gassers.

Spooky...I use exactly the same set-up with a 6S that had a cell cooked by an incorrectly specified motor pre-installed in a Hobbyking Hawker Hunter. To their credit, after some initial discussion, HK admitted the error and replaced the burnt out EDF unit and battery. A bit of internal reconfiguration provided me with a 5S battery that was/is perfectly adequate for the task of powering my starter.

The larger starter works with any engine that has come its way - the only shortcoming is that on a pair of Lead Acid batteries - and to a lesser extent on the 20 odd volts supplied by the LiPo - the switch contacts have a tendency to weld together...a flick or five on the switch usually frees them!

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