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Irvine Mills .75 replica - Page 2 Empty

Irvine Mills .75 replica

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Happy Re: Irvine Mills .75 replica

Post  Oldenginerod Sat Jul 31, 2021 5:14 pm

DingBatSplat wrote:May I also recommend Adrian's site   https://www.adriansmodelaeroengines.com/catalog/

Of course. Adrian was a close compatriot of Ron Chernich, David Owen and all the other worldwide model engine gurus. A group referred to as "The Motor Boys". Not many of them left sadly.
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Happy Re: Irvine Mills .75 replica

Post  KariFS Thu Aug 05, 2021 1:44 pm

Now I got one too!

Irvine Mills .75 replica - Page 2 E0e08610

A fellow in a (or should I say ’the’) Finnish model airplane forum had seen a picture of my 1.5cc Webra Rekord Diesel, and wanted to buy it. There’s a ”new old” competition C/L class called ”Weatherman Speed” that is getting more and more popular. Now there’s a new sub-class for Webra Rekord Diesels. Always reluctant to sell any of my engines, I asked if he’d have something to trade. Well, he had this, and since I am not going to do anything with the Webra, I thought, well, OK lol! At least that old Webra goes to good use. And this little Mills is a cool piece of machinery in my opinion. Looks like it has never been run, except maybe a test run at the factory. It’s an Aurora, and on the back of the instruction sheet it says C.P./1000/1/92. So, a 1992 model then maybe?
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Happy More mills adventures

Post  Grosvince Sun Feb 13, 2022 5:10 pm

Hi Guys

Following my Mills adventures, I've found another Irvine one :

Irvine Mills .75 replica - Page 2 20220213_223417

This one has a remarkably low serial number (0036) Shocked

The vendor selled me what seems to be a VA Mini Mills 0.4 (larger than a Pee Wee so I assume this is the 0.4 cc variant ; but could be a 0.25 cc assuming diesels are larger than glow engines for the same displacement - if anyone has some dimensions for comparison...)

Irvine Mills .75 replica - Page 2 20220213_224848

Unfortunately the engine is clogged, and furthermore the sleeve is not well aligned with the crankcase : one of the 2 intake ports is partially hidden... so I need to dismantle this little beast, but I don't now how to remove the "muff" in a clean way (without scratches). Any experience would be appreciated.

Vincent
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Happy Re: Irvine Mills .75 replica

Post  Oldenginerod Sun Feb 13, 2022 6:15 pm

The only way to safely remove the muff is to use a leather strap, or a plumber's type strap wrench.
I'm surprised that the liner is misaligned as I thought that Irvine fixed that issue. My original Mills has chunks taken out of the sides of the con-rod due to a rotated liner.
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Happy Re: Irvine Mills .75 replica

Post  getback Mon Feb 14, 2022 6:42 am

Read this about the cylinder liner repair, I got one and needs this done but i just have not had the nerve I guess? http://modelenginenews.org/cardfile/m75.html Old Bugger Getting old sucks use to bee i would get in there and DO IT .
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Happy Re: Irvine Mills .75 replica

Post  ffkiwi Mon Feb 14, 2022 3:11 pm

Your small Mills is the VA .4cc version-the best one to own-the 0.25cc has a number of issues associated with it, and few were as good as they could have been. Quite apart from the difference in size, the 0.25 is readily identifiable by having two holes at the exhaust opening rather than the oval 'racetrack' shape of the 0.4cc model. easily spotted and identified.--it looks like the numeral '8' lying sideways.

ChrisM
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Happy Re: Irvine Mills .75 replica

Post  Grosvince Mon Feb 14, 2022 3:44 pm

ffkiwi wrote:Your small Mills is the VA .4cc version-the best one to own-the 0.25cc has a number of issues associated with it, and few were as good as they could have been. Quite apart from the difference in size, the 0.25 is readily identifiable by having two holes at the exhaust opening rather than the oval 'racetrack' shape of the 0.4cc model. easily spotted and identified.--it looks like the numeral '8' lying sideways.

Thank you for identifying the model! However, as the liner is misaligned, I will have to dismantle it before trying to run it.

Vincent
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Happy Re: Irvine Mills .75 replica

Post  ffkiwi Mon Feb 14, 2022 4:42 pm

Grosvince wrote:
ffkiwi wrote:Your small Mills is the VA .4cc version-the best one to own-the 0.25cc has a number of issues associated with it, and few were as good as they could have been. Quite apart from the difference in size, the 0.25 is readily identifiable by having two holes at the exhaust opening rather than the oval 'racetrack' shape of the 0.4cc model. easily spotted and identified.--it looks like the numeral '8' lying sideways.

Thank you for identifying the model! However, as the liner is misaligned, I will have to dismantle it before trying to run it.

Vincent


I wouldn't bother-looking at the exhaust opening it is fairly close-and if it has been previously run like that you will upset the fits to a degree by relocating the liner. From memory-both my examples are in models and not easily accessible as I write this-there is no positive location for the liner, unlike in some Mills 75 replicas-which use a pin engaging in the liner flange-(the original Doonside of 1973 was the first to do this) the VA is like the originals-just screw the head down and hope. In practice-the best you can do is use a piece of wood which is a snug fit in the exhaust ports and push it through both before tightening up the head. This at least allows you a reasonable chance of keeping the alignment as the head tightens down on the liner flange. Without some form of mechanical locking, the liner will rotate slightly as you do the head up tight.

I would though remove the backplate before doing anything and check the rod-the clearance slots in the liner (put there to allow for rod angularity clearance at 90 degrees of crankthrow) can foul the rod if the liner is too far out of alignment. Forget about aligning the intake port-it is the alignment of the exhaust ports that matters-as these are the ones that relate to the conrod cutouts below. Having just gone down to the garage and checked one of mine-the intake port is not fully aligned in the venturi opening whereas the exhaust ports are-and this is what matters. It makes no detectable difference to the way the engine runs.If it's any comfort the original ones use a pair of holes in a horizontal figure 8 as the intake and transfer ports-and it was rare to find these fully aligned either.

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Happy Re: Irvine Mills .75 replica

Post  sosam117 Mon Feb 14, 2022 5:19 pm

On my Currie Mills (Aurora) I have done exactly what Chris said about using a dowel in the exhaust ports to keep the liner close to being in alignment.
Never had really any problem doing it that way as I tightened the beehive head down onto the liner.
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Happy Re: Irvine Mills .75 replica

Post  ffkiwi Mon Feb 14, 2022 5:42 pm

sosam117 wrote:On my Currie Mills (Aurora) I have done exactly what Chris said about using a dowel in the exhaust ports to keep the liner close to being in alignment.
Never had really any problem doing it that way as I tightened the beehive head down onto the liner.

I usually use a short length of spruce, rounded off at the edges-the key is not to use anything hard, or reach for the nearest screwdriver or steel tommy bar to do the job, lest you burr the cylinder. If you have the skills and equipment-at the very least a Dremel and a pinvice for small diameter drills-there is merit in installing a pin in the case to engage with a matching slot in the liner flange. I've done this to some of my non Doonside Mills-I may have done it to some of the other engines such as the VA's as well....I'm fairly sure the MP Jets have it done during manufacture...

ChrisM
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Happy Re: Irvine Mills .75 replica

Post  sosam117 Mon Feb 14, 2022 5:53 pm

I have used my Dremel tool to drill small holes for a pin and 1/2 the time I break off the small drill while drilling the hole.
Now with the broken drill (if it is sticking out) becomes my location pin.


Last edited by sosam117 on Mon Feb 14, 2022 5:54 pm; edited 1 time in total (Reason for editing : spelling error)
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Happy Re: Irvine Mills .75 replica

Post  ffkiwi Mon Feb 14, 2022 6:01 pm

sosam117 wrote:I have used my Dremel tool to drill small holes for a pin and 1/2 the time I break off the small drill while drilling the hole.
Now with the broken drill (if it is sticking out) becomes my location pin.

Yep-you have to use a delicate touch-IIRC the original Doonside used a tiny length of .010 or .012 control line wire-so that's a damn small drill to drill the hole with...I use a pin vice or a small spiral jewellers push drill to do the drilling-I tend to use something metric mostly since I don't have much in the way of those 60-80 number drills-a 0.5 mm works for .020 wire-a few 10 thou undersize-and you have to tap the wire in-which helps it stay put. I just use the dremel with a thin cutoff disc to cut the small slot in the liner flange

CJM
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Happy Airborne Mills

Post  Grosvince Sun Feb 27, 2022 4:27 pm

Hi Guys,

Some sun eventually here in France. I've got a try on the Mills .75, on a Boddington design, the Mills Beam. This plane flies well under engine power, but glide like a cloth iron. But I love the sheets&sticks design (some sort of a 2CV of a plane - the 2CV is a post-WW2 minimal french car)

Irvine Mills .75 replica - Page 2 20220210

The engine seems wanting to run at constant speed, but you can greatly improve the duration of the tank by tweaking needle valve and contra-piston.

https://outerzone.co.uk/plan_details.asp?ID=7793

Indeed, some serious fun !

Vincent


Last edited by Grosvince on Mon Feb 28, 2022 1:44 am; edited 1 time in total
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Happy Re: Irvine Mills .75 replica

Post  Ken Cook Sun Feb 27, 2022 6:51 pm

Very neat indeed, I love the fact your using a diesel. I powered a few free flight planes with my converted diesels from Cox engines. I was getting runs that were too long. I still loved hearing it though.
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Happy Re: Irvine Mills .75 replica

Post  Grosvince Mon Feb 28, 2022 4:54 am

The tank is very tiny (maybe 2-3 ml) but the runtime equals a well tuned Babe Bee with a 5 ml tank.

I will make an external tank for RC flying.

Regards
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Happy Re: Irvine Mills .75 replica

Post  getback Mon Feb 28, 2022 7:19 am

It Looks Great Vincent I looked at the pic on Outerzone
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Happy Re: Irvine Mills .75 replica

Post  Grosvince Mon Feb 28, 2022 10:59 am

Thank you, I've just seen Outerzone used my pic as the main pic on the Mills Beam page !
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Happy Re: Irvine Mills .75 replica

Post  getback Mon Feb 28, 2022 1:37 pm

Surprise Surprise !! Thats cool i thought you put the address in there for that lol! I Love This Forum!
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Happy Re: Irvine Mills .75 replica

Post  ffkiwi Mon Feb 28, 2022 5:21 pm

Grosvince wrote:The tank is very tiny (maybe 2-3 ml) but the runtime equals a well tuned Babe Bee with a 5 ml tank.

I will make an external tank for RC flying.

Regards

I assume you are not aware that there is a larger tank made for the Irvine Mills specifically to give a longer run for R/C use?   whilst hard to find there may well be a few left with some UK stockists such as Steve Webb models-the 'long range tank' has about twice the capacity of the standard tank and is a direct screw in replacement onto the normal Irvine 75 intake assembly

ChrisM
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Irvine Mills .75 replica - Page 2 Irvine11

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Happy Re: Irvine Mills .75 replica

Post  Grosvince Tue Mar 15, 2022 12:27 pm

Hi guys,

A little video of the beast taken at our airfield :



I'm not very proud of my rear wind landing DAMMIT!

The tank is very tiny for RC usage !

Regards,
Vincent
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Happy Re: Irvine Mills .75 replica

Post  getback Wed Mar 16, 2022 8:51 am

She looks to fly very well , and it states it not a good glider but flys well under power , So you got it right ! Thanks for sharing and Yes a little longer would bee better . RC Plane
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