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Member postings for Gordon Whitehead 1

Here is a list of all the postings Gordon Whitehead 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: Outrunner Magnets Decomposing to Dust
20/09/2018 21:21:45

The magnets are flaking and pitting Chris and David. The only hydrogen they'd have ever been near is that chemically bound in the water vapour in the damp flying conditions we often have to suffer in this country. I'm wondering if the magnets are made from powdered magnetic alloy bound with some kind of glue which is degrading with age. The epoxy fillets which you can see securing the magnets is araldite which I used many moons ago when re-installing detached magnets, and that has stayed whole. The motor wasn't particularly powerful but the current Aeronaut advert has it at a breathtaking 129 euro. I remember it did cost an arm and a leg when I bought it but nowhere near that. Perhaps the current limit was dictated by the magnets' composition.

The magnets in my equally old AXI 4130/16 of about the same age and stored in the same box are still whole, thank goodness, as are those in a couple of old Hacker A50s I regularly use.

Gordon

Edited By Gordon Whitehead 1 on 20/09/2018 21:22:26

20/09/2018 19:14:50

During the past week I've been working up the enthusiasm to design a nice 3S-powered Hawker Fury. Today I took the intended motor, an Actro C-6 1150kv outrunner, out of storage to check it out. I was a bit nonplussed to find that on fitting the prop this carefully stored motor felt really stiff when I turned it by hand. Rather than apply power, I took the motor apart and the photo show what the innards look like.

actro c-6 decomposing magnets.jpg

The motor is well over 10 years old and has sat in a warm drawer in my workshop for at least the past 10 years. I do remember having to re-araldite some of the magnets back in place when the motor was only a month or so old, but haven't seen anything like this before. Applying sellotape doesn't remove hardly any of the magnetic dust, btw.

Clearly I need a new motor. The Actro was only good for 30A so I'm planning to buy a replacement with rather more current handling capability.

Gordon

Thread: Home made exhaust for petrols....
04/09/2018 17:43:11

Checking the volumes of the various Krumscheid silencers for large petrol engines here they are all in the range 14 to 16 times the capacity of the engines to be silenced. This, then, is probably a decent guide as to how big to make a home-made silencer for a given 2-stroke single.

Gordon

Thread: Ashbourne Scale Day
04/09/2018 13:54:47

Me too, Chris!

Gordon

Thread: Servos that swing both ways!
20/08/2018 18:20:16

I had the Fleet version. I swapped the linear outputs for rotary, not realising that there were no end stops and the rotary output arms could go a full 360 degrees. So if (or in the case of my Fleet radio, when) you lost the signal, the servo would rotate right round until pulled up by the pushrod. This happened one day at height with my lovely HB 61 powered Mick Reeves Fournier, when the servos all went to one end, the elevator being stuck on down. Naturally the plane was a write-off.

If one does wish to use a rotary output on this type of servo, the safe thing to do is cut off the lugs from the linear output racks so that they don't interfere with the output arms, and re-install the racks to act as end-stops. Then if the Rx loses the signal briefly, at least the servos have a chance of returning to normal service when the signal is resumed.

Gordon

Thread: Cornwall Aviation Co Ltd Avro 504k Aerobatics and Wing Walking
05/08/2018 22:01:40

Hi Tom, simply copy and paste the url I quoted into your address bar and press enter. I hope this works for you. Or does that not work on a mobile or tablet?

Actually I've just found the link instructions. Hang on while I try !

Cornwall Av'n Co Frolics

I'll just check that it works

Yup!  it does!

Gordon

Edited By Gordon Whitehead 1 on 05/08/2018 22:02:21

05/08/2018 20:27:55

On this evening's Antiques Road Show the grandson of the founder of the Cornwall Aviation Co Ltd, Capt P Phillips, showed some memorabilia and described the background to the company. Intrigued, I googled the company and found this fabulous cine film which I though you all might like to view.

http://cornishmemory.com/item/CHA_05

Gordon

Thread: Laser 180 Petrol
04/08/2018 19:20:53
Posted by SR 71 on 03/08/2018 21:08:08:

Hi Jon can the needle valve be turned to the side, never owned a laser but very interested in the petrol one

If you mean can the carb assembly be rotated so that the needle points out sideways wrt the cylinder, as on the Saito 180 FS and ASP 180 FS, it's possible that the throttle arm/slow running screw assembly will interfere with the silencer to prevent a full 90deg rotation. If a flex tube exhaust is used, then in the absence of the silencer body I suspect that the carb assy will readily achieve the full 90deg rotation.

Anyone with a spare Laser laying around could check that for you. Mine is in a cowled installation so I can't help you with that.

Gordon

01/08/2018 22:56:28

Hi Jon

GA25? Isn't that the petrol version of the 155, and not the 180? If so, goody!!!

Cheers

Gordon

Thread: New Drone Laws from 30/5/2018
27/07/2018 12:30:48
Posted by ChrisB on 27/07/2018 08:49:41:

Collateral damage????? That’s ridiculous, there should be no impact from any electronic interference on innocent and law abiding parties! So far I’ve been quite relaxed about the regs, but this is an issue that must be fully addressed!

I was thinking more of the impact of a shot-down drone on striking something, be that a car driver's windscreen, baby in a pram, kids playing football, a prison inmate walking round the yard unaware of the drone smuggling going on at the time. There would be lots of scope for media hype in such a situation, hence the requirement for carefully devised procedures and systems.

How would you have dealt with the V1 and the Scud any differently than they were defended against at the time? The falling destroyed missile debris would always risk causing harm to someone or something, but the missiles' destruction would usually have been required to protect the intended target.

27/07/2018 08:08:24

I don't think it will be totally indiscriminate, in that a procedure will be designed, trained for and followed before pressing the tit.

There'll always to be a risk of collateral damage, and I'm sure that any risk will be evaluated before action is taken.

Gordon

PS  I've read it too.

Edited By Gordon Whitehead 1 on 27/07/2018 08:09:02

Thread: Spinner choice ?
26/07/2018 16:32:08

You might make a better job of keeping the spinner backplate hole central if you use a propeller reamer.

Gordon

Thread: New Drone Laws from 30/5/2018
26/07/2018 06:39:08

Somewhere within these 38 pages Geoff is a reference in the official documents defining ground level as just that, ignoring buildings, trees etc. I read and noted it because we have tall trees bordering our flying field so our club has a vested interest in knowing the situation ref ground level. But I'm not wading back through this lot to find it!

Gordon

25/07/2018 13:15:51
Posted by Andy Symons - BMFA on 25/07/2018 13:13:51:

It is however a choice you can make. Makes the £34 BMFA membership fee look even more of a bargain.

It's always been a bargain since I joined back in the 1960's

25/07/2018 12:59:26

The law is that the Air Navigation Order applies to every man woman and child in this country.

Edited By Gordon Whitehead 1 on 25/07/2018 12:59:42

25/07/2018 12:40:13

Congratulations to the BMFA and the allied associations for negotiating an excellent result.

There's just one area which I've been trying to clarify by reading the new permission document, the ANO Article 94, the relevant but now out-of date BMFA Handbook sections 8.1(4)(b) and 8.1(4)(c) and the BMFA update.

The old BMFA rules (2017 edition) page14, paras 8.1(4), 8.1(4)(b) and 8.1(4)(c) were perfectly clear that model flying within an aerodrome traffic zone was restricted to below 400ft for models weighing over 7kg and that those weighing less than 7kg weren't so restricted. Note that para 8.1(4) subsumes all subsequent sub-paras.

The new permission document isn't quite so clear. Para 3a of the permission does state that the mass of the SUA shall not exceed 7kg etc, but does not subsume para 3d, which states that the permission shall not apply to any flight within the flight restriction zone of a protected aerodrome ... etc.

This means to me that the old rule whereby you could fly a sub-7kg model above 400ft within an air traffic zone has gone, but I might be wrong.

The BMFA update states that any model aircraft flying within 1km of the boundary of a licensed airfield at any height will have to be with the permission of the airfield air traffic control or airfield operator. Clearly this applies to all models whether under or over 7kg. Is this 1km limit the same as the "flight restriction zone" mentioned earlier, which is a far smaller area than the ATZ? Or does "flight restriction zone" mean "ATZ"

What I'd like to have clarified, in the context of the majority of model flyers, is this: which of the following statements applies in regards to, say, Manchester Airport ATZ, Birmingham Airport ATZ, etc:

a. Nothing flies over 400ft

b. Models under 7kg can still fly over 400ft but those over 7kg are prohibited.

There are quite a lot of model flyers located near airports who will be affected by the answer.

Gordon

Thread: RAF's Finest Biplane? Hawker Fury MkI
24/07/2018 12:29:07

Hi Danny

It's not my photo sequence. The last time I had to trim a spinner was years ago, well before I found this photo sequence, and I can't really remember how I did it. Probably by chain-drilling a series of holes, joining the holes with a very thin rat-tail file, then finishing off using a dremel with coarse grit grindstone to get the overall shape, with a half-round rat-tail file for finishing.

Gordon

Thread: New Drone Laws from 30/5/2018
24/07/2018 12:14:42

WOW! That video was a real conversation stopper! Is everyone just too gobsmacked, or has everyone gone on holiday?

OK, let's attempt to cheer things up with another video which shows my miserable attempt at doing an unscripted uncoordinated aerobatic sequence within a 300ft height restriction back in 2011. Due to other defined "no fly" areas (this was on an airfield too !!) the entire box was about 300 yards long by 200 yards across, just a bit bigger than the sheep field I fly in these days. It's just possible that I did stray a bit out of the "box" on occasion, but not by much. My thanks to Harry Curzon on camera for staying on his feet when he should have been dizzy, and filming each of the two flights in its entirety so there was no need for stitching bits together.

It's not pretty! Here's hoping we get the required height exemption.

Gordon

Edited By Pete B - Moderator on 24/07/2018 16:12:34

Thread: RAF's Finest Biplane? Hawker Fury MkI
24/07/2018 11:36:17

Ref spinner cutting. I found this series of annotated photos on a forum some time ago. Apologies for not noting the name of the originator.

01 draw.jpg

02 fold.jpg

03 cross.jpg

04 centre-line.jpg

05 prop-exit.jpg

06 height.jpg

07 template-2.jpg

08 prop-fitted.jpg

Hope this helps

Gordon

Thread: New Drone Laws from 30/5/2018
22/07/2018 20:58:59
Posted by Piers Bowlan on 22/07/2018 07:49:23:

I hope you do complete your JP design Gordon as I have a Wren 44 and a JP would be just the ticket for it.

A clubmate is relying on me doing a plan, Piers, so I'll get on with it soon and probably do a build thread too. It'll be a JP5A which allows the choice of with/without tip tanks, and whether or not to decorate and equip as a Strikemaster. Apologies for delayed response.

Gordon

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