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Club Mills!

Old 07-09-2015, 12:40 PM
  #376  
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KE51, I get 7,900rpm using a Topflight 9 x 4 and 6,500rpm using a Topflight 10 x 4, fuel is Modeltechnics D1000 http://www.modeltechnics.com/diesel.htm Didn't notice excessive vibs on my 'curry' Mills 1.3. It neede some attention when I got it from the 'bay as BNIB. It had a pourous crankcase casting that was fixed by the application of metal filled epoxy. You could try the old trick of moving your prop 180deg. Assuming your prop is in line with the piston /conrod/bigend bearing at TDC, loosen prop and rotate 180 whilst maintaining position of engine components. One way any prop out of balance may be adding to the reciprecating out of balance, the othe way it will help to balance the reciprecating out of balance. In the past some would use a deliberatly out of balance prop and position it to get the least vibs. As to Indian Mills conrods, I believe they are made out of dried chewing gum and rice!
Old 07-09-2015, 12:43 PM
  #377  
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earl, all my Indian Mills(3) have intake slots in the liner and all my Irvine Mills(3) have two holes that are in line.
HTH
Old 07-09-2015, 01:48 PM
  #378  
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The sample Mills that Ivor supplied had the ports out of line.
He wanted the Doonside to be a replica.
We copied.
Peter
Old 07-10-2015, 01:18 PM
  #379  
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Yes I noted that my Indian Mills had the two intake holes not in line with each other. But I didn't know if there was a reason for it or not. So it is just sloppy careless work on the part of whoever drilled the holes then.

That is a good story Peter. LOL.
Old 07-11-2015, 03:28 AM
  #380  
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Two holes is easy to understand, leaves uninterrupted wall for the gudgeon pin to run down.

Perhaps the staggering of the holes is intentional resulting in a longer inlet port open timing despite the small hole diameter.
Old 07-16-2015, 05:32 PM
  #381  
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In reply to Chris M. (post no. 361 on this thread)

Here is a dark case Doonside Mills Mk II currently for sale on Aussie *bay. Seller is well known and it appears pristine.
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Old 07-16-2015, 05:52 PM
  #382  
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Well well well-that's the first I've ever seen-looks nice dunnit!

CJM
Old 07-16-2015, 11:59 PM
  #383  
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I agree. I like the look (which is closer to the English Mills di-chromate finish magnesium alloy) more than the 'shiny' case Doonside red head I have.

Last edited by fiery; 07-17-2015 at 03:34 AM.
Old 07-17-2015, 01:40 PM
  #384  
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Originally Posted by fiery
I agree. I like the look (which is closer to the English Mills di-chromate finish magnesium alloy) more than the 'shiny' case Doonside red head I have.
I wonder what the actual treatment was-it wouldn't be chromate as that was developed specifically for Mg-Al aircraft alloys-and the Doonside case was Al-Si alloy. Maris might know, being an expert on Taipans-or Peter B if he sees this.....

ChrisM
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Old 07-17-2015, 03:19 PM
  #385  
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I recall that these few 'cases were anodised.
The silicone alloy went a mottled dark grey rather than the normal pale grey of "natural" anodising on extrusions.
They were not dyed after anodising, just needed a residue brushed off to leave the finish you see.
Peter
Old 07-17-2015, 03:37 PM
  #386  
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That would make sense Peter-Si in the alloy does funny things during standard metal process chemical treatments-the fact that it anodised at all is a bonus. I found out the hard way about 25 years ago when using the nitric acid trick to remove a broken off tap from one of Des McAnelly's cast FF pans......got rid of the tap OK-but the pan went quite dark and speckled in the process-it too was Si-Al casting alloy-probably very similar to the Doonside cases. Nitric acid is a normal part of the 'desmut' process during anodising (I use 20% v/v HNO3 for this step) so could well have generated the color...

ChrisM
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Last edited by ffkiwi; 07-17-2015 at 03:39 PM.
Old 07-18-2015, 12:39 AM
  #387  
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I'm sorting through a deceased friend's aero-modelling effects and I found these Magnesium alloy castings for small Mills type engines. I believe that at least one is for a Mills 1.3.





The quality is quite good apart from a little corrosion. Much better than my crudely enhanced pic shows. He's also let a number of Magnesium Alloy speed pans which clean up very nicely even though they turn black again very quickly. One of these on a .60 sized c/l speed model pan is quite impressive. He replaced the original Aluminium alloy version with the Magnesium to save weight and to put the models weight under that allowed by a rule revision. Fifteen years later, it's aged very nicely with no sign of corrosion.




He did the projects at a local night course on metal casting at Newcastle Technical College. The Magnesium casting process was one of their specialities. They used discarded Volkswagon gearbox transaxle casting for metal, under the surface of some inert gas I believe.
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Old 07-26-2015, 01:56 PM
  #388  
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A good final price for the Doonside.
I'm not certain, but I recall we got $12.50 each and $13.50 for the anodised ones.
Dad's Gee Bee went for more!
Peter
Old 09-22-2015, 04:33 PM
  #389  
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The 'Pesky' .44 c.c from PAL model products. A modern take on a classic design.

It's anything but 'pesky' ...

https://www.youtube.com/watch?v=OEgM...ature=youtu.be

http://www.palmodelproducts.com/pesky.html
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Old 09-22-2015, 09:54 PM
  #390  
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Looks good Derek, is that a 7x4 on it.
Pretty little engine.
Old 09-22-2015, 10:33 PM
  #391  
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It is a 7 x 4 brusta; a Top -Flite nylon.

In the run after the video I 'tweaked' needle and compression settings and ran it in the low 7,000's. Spent an hour or so with it. It's RPM's are not far behind a newish CS Navo Mills .75 I ran a few months ago for a mate. Impressive.

I was slightly annoyed with myself. In the video it took 4~5 flicks to start due to slight over priming. Most starts were two flick affairs.
Old 11-10-2015, 05:41 PM
  #392  
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I just listed this Doonside Mills on ebay.com.au

Ad has been changed.
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Old 11-12-2015, 05:50 PM
  #393  
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GLbiggles, unfortunately what you have is not a Doonside Mills...it's a Russian one that was part of a batch made for Ivor. If it does not have the serial number 261 stamped on the case underneath the crank shaft casting or has the letter "Z" stamped on it then then it is Russian.

Ployd in OZ

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Old 11-12-2015, 06:31 PM
  #394  
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Peter I guess that's correct as it has a Z under one lug and the serial under the other one.
I do remember that at about the same time he also had some ABC .75's.
He did sell it to me as doonside and told me it was a good performer. I have read somewhere (maybe here) that he
Has russian made mills and had to pick through them to get ones that satisfied him.
Old 11-12-2015, 07:19 PM
  #395  
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Ivor was still selling these Russian ones as 'Doonside Mills' in the 90s-just not as 'original Doonside' ones. Any one that comes with the hand written note (in his trademark aqua green ink) is a 'genuine' Ivor F certified Doonside Mills. In other words it was one of the batch he contracted the Russians to make for him-AND which passed his stringent quality control checks-[most did not-but were still onsold by the Russian to whomever would take them (I understand the initial production batch was something of the order of 1000-of which Ivor checked each one and was happy with only a few hundred or so. [my own example bears the serial #690-but is otherwise as GL Biggles one above-complete with hand written note!]. I also understand that subsequently the Russians manufactured more-in ferrous P/L technology which were onsold through various channels. In any case the Russian made Mills 75s are readily distinguished from all the other versions by their thicker cylinder fins-with straight edges not rounded off-and most importantly-the splined on prop driver and 3mm replaceable prop shaft stud-the latter provides an obvious and unequivocal identification.

ChrisM
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Old 11-12-2015, 08:30 PM
  #396  
fiery
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The engine shown in post #1 is a late ferrous 'Russkie Mills'. It is a really nice example. It is the same as the Russian Doonside but is not a real "Doonside" as it was not sold by or with approval of Ivor F. I bought it direct from Ilya Leydman who at one time imported a range of Russian engines into Australia and sold them under the business name "Macheast Trading".

Last edited by fiery; 05-23-2017 at 12:42 AM.
Old 11-14-2015, 09:00 PM
  #397  
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Default K-Mills 500 5 c,c.

It's surprisingly nice. Tornado 12 x 4 prop. Max RPM (without pushing things) 7,100

https://www.youtube.com/watch?v=SQQ_uyGy0C4
Old 12-10-2015, 11:01 PM
  #398  
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Nice Poppet powered by an in-line twin side port 0,4 c.c.


https://www.youtube.com/watch?v=ik4Bk2hXK0A

Last edited by fiery; 12-16-2015 at 10:20 PM.
Old 06-22-2017, 12:40 AM
  #399  
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Default CS Boddo Twin 0.75 (1.5 c.c.)

CS Boddo Twin.
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