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August 19, 2017, 12:05:56 PM

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1
RC Model Flying Events / It's almost Nationals 2017 time.
« Last post by Big A on Today at 12:01:13 »
A return to RAF Barkston Heath after  year off.

So whos coming along??

Sent from my SM-G920F using Tapatalk

2
Introduce Yourself Here / Re: introduction
« Last post by itsme on Today at 10:16:44 »
Hi, every one my name is Tom and I'm a model builder.

Thanks for the time,  Tom
Sounds like a confession, Tom! Welcome to the mad house.

 
3
Fullsize Aviation / Re: BBMF merlins grounded
« Last post by itsme on Today at 10:15:08 »
I'm no expect in oils (or anything else for that matter although I do know a fair amount about the old Soppy Tripehound!)


HTH & ICN

Alan
I thought they used castor oil? Which is why they used silk scarves to try to prevent the 'runs'...lol?
4
Fullsize Aviation / Re: BBMF merlins grounded
« Last post by Bad Raven on Today at 09:57:36 »
Modern engines run much closer tolerances than older engines so need thinner oil.

Modern oils have more friction modifiers to increase fuel efficiency, which can lead to reduced oil film strength and damage parts. They are not designed to work at the thickness an older engine requires.

And most of all, older oils used Zinc in a complex phosphate to provide friction reduction. This has generally been removed from modern oils as it adversely affects catalytic converters (an expensive item!)

Till fairly recently I was responsible for over 20 pre-WW2 petrol engines, one nearly pre WW1.
5
Fullsize Aviation / Re: BBMF merlins grounded
« Last post by Plain ol' Puppers on Today at 09:37:19 »
I've heard this thing about old cars. That modern oils are 'too good'. As a none mechanic/engineer, can someone explain the physical problems and why it happens? Is it the sheer of the oil molecules? The metal too hard/soft?

I'm no expect in oils (or anything else for that matter although I do know a fair amount about the old Soppy Tripehound!) but my understanding is that is things like incompatabilities between the materials used in the engines/gearboxes and the constituents of the "oils" which have changed considerably over the years.   For example; the phosphour bronze plain bearings used in older engines do not take kindly to modern oils which cause the material properties to change and consequently break-down.  I understand that there are a number of such considerations and the evolution of oil sort of goes hand-in-hand with the evolution of the engine technologies.   That's why there are warnings on oils to make sure that it is the right oil for your engine and not like the old days when your choice was mainly down to "Brand Loyalty" (good old Duckhams Q  ;) ).

HTH & ICN

Alan
6
Introduce Yourself Here / Re: introduction
« Last post by Michael_Rolls on Today at 07:32:21 »
welcome aboard, Tom
Mike
7
Fullsize Aviation / Re: BBMF merlins grounded
« Last post by SteveBB on Today at 02:36:27 »
I've heard this thing about old cars. That modern oils are 'too good'. As a none mechanic/engineer, can someone explain the physical problems and why it happens? Is it the sheer of the oil molecules? The metal too hard/soft?

Thanks in advance.  :)
8
Fullsize Aviation / Re: BBMF merlins grounded
« Last post by Plain ol' Puppers on Yesterday at 21:50:13 »
If it is oil contamination of metal particles then it is the use of a "newer" rating oil. There is a notification that the USA "Packard Merlin" guys had last year that using this particular oil is not suitable for their engines and several of the P51 owners found they had contamination particles in the oil after only 10 - 50 hrs of running using this oil. As they have to do 10hrs running period before "show" flying it became apparent at this early stage and they had to go back to the old spec oil, and in some cases an expensive overhaul that was not anticipated! If this is the case that the BBMF guys have used this oil then it is engine refurbs and a return to the older spec oil.


This is what I use in my 65 year old machine, perhaps they should try it although they might need a bigger tin ....  ;D

http://www.halfords.com/motoring/engine-oils-fluids/engine-oil/halfords-classic-oil-20w50-5l

Alan
9
Introduce Yourself Here / introduction
« Last post by Rhino on Yesterday at 21:49:19 »
Hi, every one my name is Tom and I'm a model builder.  I'm always looking for 3D projects to enhance my R/C models.

Thanks for the time,  Tom
10
Fullsize Aviation / Re: BBMF merlins grounded
« Last post by itsme on Yesterday at 20:44:52 »
No worries, the Dak will be out there making inverted passes and victory rolls, though the opposing pair might be a bit traumatic...............
Aw dont mock it. I love that bird...
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