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Member postings for Nigel R

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

Thread: An Isolation Mass Build?
20/03/2020 11:46:02

Later this year, I am thinking the current project on the bench is going to get a Corona Beer colour scheme.

20/03/2020 11:43:51

martian, like it, I could really use a simple plan for a child friendly hovercraft or airboat type thing that I could make out of foamboard and a 50W - 100W power source and a couple of 9g servos (or similar)

if it can scoot about on a grassy field, brilliant

Thread: IC Engine Bearings...
20/03/2020 11:18:39
Posted by Jon - Laser Engines on 20/03/2020 09:23:53:

I just did a very crude test but i estimate i use up to 320kg of force to insert the bearings into our front housing as my press has a force multiplication of about 16 and i apply up to around 20kg of force to the handle.

 

Does that hold true when the operating temperature climbs?

I'd expect a slackening of the fit and reduced holding force.

When we swap bearings as amateurs, the first tool in the box is heating the whole motor, and often the bearing just drops out

Edited By Steve Hargreaves - Moderator on 20/03/2020 19:46:51

20/03/2020 11:16:54

crank (nearly) floats in the rear bearing gents, the crank is not pressing against the bearing's inner or outer races... remember how easy it is to get the crank free with a light tap when disassembling (assuming you don't gum your motor with castor, but that's a different argument)

front bearing is held tightly as jon says by prop driver against step in crankshaft

rear bearing takes all the pulsed rotary loads from conrod, I guess it needs the extra size due to magnitude of torque peaks

Edited By Nigel R on 20/03/2020 11:19:34

Edited By Steve Hargreaves - Moderator on 20/03/2020 19:46:29

Thread: great service
19/03/2020 16:32:13

Vortex Vacforms

Ordered by email/paypal, received within a few days. I think Steve probably had to pull the canopy before posting it. Very nice canopy too.

Thread: An Isolation Mass Build?
19/03/2020 16:07:42

"With lots of us self isolating do we need some project to keep us occupied usefully?"

I imagine my better half has a list of demands projects longer than I have ever seen before.

Thread: Engine Failures
19/03/2020 11:43:38

I recently revived an old mk1 Irvine 46 helicopter engine. The engine was completely locked, carb and all, and sold as spares only. I soaked in IPA for a couple of days and it all felt free again. As it only cost a few quid I gave it a bench run. It ran perfectly well, but, the plug that came with it blew on the first run, which I just put down to age / use. I could see nothing in particular wrong with the plug when I pulled it so replaced and ran again, no further plug problems.

I opened the motor up again following the bench run, I could now see damage to the piston crown, and the main bearing, which had felt ok, was now rough.

Wish I'd read your post a few weeks ago!

As fate would have it, prior to running it, I had bought an aero head from a fellow forum member who wanted to move on a spare piston/liner with the head. I've now swapped out both bearing, head and piston...

Thread: Insanity seems to be setting in
18/03/2020 09:18:33
Posted by Peter Miller on 18/03/2020 08:17:49:
Posted by PatMc on 17/03/2020 21:17:05:
Posted by Peter Miller on 17/03/2020 21:08:32:

I can't help wondering what would have happened if the population had a similar mindset in 1939.

Was there a pandemic in 1939, Peter ?

Yes. IT was called World War 2

Some numbers.

WW2, UK only, 451 thousand casualties.

Asian flu, 1957, UK, 9 million cases (est), 14 thousand casualties.

Hong Kong flu, 1968, UK 30 thousand casualties.

Coronavirus, UK death predictions vary, but yesterday's BBC article had this:

"The modelling projected that if the UK did nothing, 81% of people would be infected and 510,000 would die from coronavirus by August."

**LINK**

17/03/2020 17:48:44

Careful Pat, you'll be accused of politics soon, even though you are just reporting facts. Next thing you'll be suggesting we take a look his CV during the stints as Foreign Secretary or Mayor.

Thread: Fuels Paradise
17/03/2020 17:45:54

Informative as ever Jon, many thanks. yes

Thread: Insanity seems to be setting in
17/03/2020 17:43:03
Posted by john stones 1 on 17/03/2020 17:29:29:

Some shops here opening for our old folks only, during certain hours. Good move. yes

Concur.

17/03/2020 17:42:16

"My last thanks to God, is thank goodness it was some one who is competent, who won our last General Election, a born manager. Rather than one of the alternatives, who could not organise a drinking session in a brewery"

A drinking session in a brewery is one of the very few things I would trust Boris to organise.

Still, now's his dream chance to look like his childhood hero, that WW2 figure of authority... Capt Mainwaring.

Back to the real subject

"Now my thoughts are, how, or when, will the restrictions be eased, without a spike in illnesses?"

China are lifting restrictions - watch this space. They are, if I understand things correctly (colleague with Chinese wife currently in China) red hot on contact tracing and looking for any cases in the provinces outside of the original epicentre.

Thread: Fuels Paradise
17/03/2020 13:47:43

"Nigel, bearing cage failures. They happen on all engines no matter fuel but its the proportions that caught my attention as well as things i saw while working in the model shop years ago which demonstrated it was not brand specific.

To be clear, castor causes bearing failures as well, usually after long storage. Corrosion does the same irrespective of the oil used but as i said before, it was the numbers of identical failures on a given fuel in engines that otherwise looked to be in good condition."

Thanks Jon - interesting that it is the cages being affected. I assume it is the particular type of stainless somehow interacting with either the oil itself, or its combustion residue.

I've seen neither foaming nor performance issues with it - YMMV, I guess.

16/03/2020 16:22:48

" certain type of failure"

Jon, feel free to keep it to yourself if it is in any way 'sensitive', but you've piqued my interest, what sort of failures have you seen?

16/03/2020 15:14:22

The only bearing failures I have experienced have been with castor, many moons ago.

Now, what does that prove?

Nothing, I think...

Anyway, I'm another one using that evil Weston stuff. Nothing has exploded or seized or rusted or peeled - so far.

Thread: Laser 180 Petrol
13/03/2020 09:22:49

Maybe, maybe not. Every successful project has a very well defined end goal. Maybe you just need to figure out exactly what you need to get the 180 & 155 to "complete". My thoughts are that if you don't see major mechanical changes being needed then the motor itself is there. Minor mechanical changes, maybe the first batch has to be covered by the disclaimer of a potential recall for a small mod. Getting the instructions debugged, well yes, you need that, for sure, but how many more beta testers (or indeed owners) do you need to go through them before they reach "maturity"? 1? 5? 20? 100? As the saying goes, a product only ever really completes its test programme when the last unit is sold to the last customer... Just thinking out loud.

As an aside, I'd love to help out but I don't have anything big enough to trial one on, or budget to buy one with.

Thread: English language ?
13/03/2020 09:14:47
Posted by Jason-I on 12/03/2020 21:23:01:
Posted by Nigel R on 12/03/2020 21:19:28:

You should try being part of an american owned large company.

Managers aren't managers, they are people leaders...

We all have to socialise our ideas (!) amongst other oxymorons.

I could go on.

So long as you give it 110% you'll be good.

These days I find 200% is a better target to aim at, 110% is a bit last century.

As I work an agile process, we are always sprinting.

I note few people ever seem to point out the impossibility of "always sprinting". Apparently, the more realistic "cruising at a sustainable pace" is not a sufficiently motivating expression.

Thread: Has Your Club Made Any Decisions Regarding The Coronavirus?
13/03/2020 09:07:53

Closing the flying site seems a bit bonkers.

OTOH if your monthly get together is inside a pub, that's the kind of thing we're being (fairly sensibly I think) advised to cut down on.

 

 

"One has to wonder whether glow fuel would be an effective disinfectant too?"

I believe methanol 70% water 30% is a pretty potent antiviral solution. The water is important apparently, it helps get the alcohol into the viral structure. Neat methanol obviously not so great for you as a whole though!

That hand sanitiser stuff is essentially the same mix with isopropranol instead of methanol. But, by the same token - have you seen the price of isopropanol lately!?

Edited By Nigel R on 13/03/2020 09:08:46

Thread: Laser 180 Petrol
13/03/2020 08:48:36

Ok Jon, fair enough.

Another question if I may, how much more beta testing would be sufficient to get you to production ready?

12/03/2020 21:31:51

You've sent 3 engines out to people who have run them and used them as intended and all 3 of those performed up to expectation. So far I'm not sure I see an impediment to getting the petrol 30cc available on a commercial basis.

As for the guys who bought - at a discount - and then vanished... I really would not take the lack of useful feedback from them (or indeed the one who messed up the ignition or the one who said he'd run it - and then vanished) as any indication of anything, other than an object lesson in how much you can rely on the general public (and there are all sorts of reasons why someone may seem to vanish, even with the best of intentions). It certainly does not indicate how easily you will or will not be able to sell the engines.

Honestly, if I was managing your project I'd now move to a small batch for proper commercial sale.

 

All the best on the other project, whatever you decide.

Edited By Nigel R on 12/03/2020 21:32:47

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