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KEITH BEAUMONT 1

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Everything posted by KEITH BEAUMONT 1

  1. The engine was really far from zero running in. Every engine I have made is set up on the lathe,minus contra piston and turned over for an hour at 500 RPM, being flooded with plenty of oil at the same time, before finally reaching the test rig. When it is running, the NV is set to rich,with the occasional tweak to smooth running. That is when I took the photo of it running. All my engines have improved compression pressure after the running in regime I follow. Experimenting with different props is part of the fun. I have a static thrust rig and using a mixture of props with an engine, using that ,gives some suprising figures,somtimes. If I break something, I just make a new part, but that does not happen often. Thank you for your comments regarding engine, Keith.
  2. None of the engines I make ever get further than the test bench. My days of flying are many years ago. I see no problem in seeing if an engine will run on various props. To hear it start for the first time is always the exciting part. That ,surely is a useful purpose. Keith.
  3. Hi Rich, Thanks for comments. The tank was made from 20mm diameter x 2 mm wall, Acrylic tube, with an acrylic bottom ,with location stub and bonded with super glue. 26 tpi screwcut to locate with simlilar thead in Ali lid. If you are thinking of making it, I suggest you read my earlier post regarding it,on the Model Engineer Forum. I put a few more details on that. Keith.
  4. Interesting comment,Brokenenglish. What disaster are you predicting I avoided?
  5. During a recent perusal of the very informative site, run by Adrian Duncan,for those interested in model I/C , engines, www.adriansmodelaeroengines.com. I discovered information and drawings for this 1950s design in the alphabetical list of model engines in the "Engine Articles"section. As it was possible to make it from bar stock and I had sufficient material to hand, I decided it would be my next project. The article mentions it has been made by several of the "Motor Boys" from the late Ron Chernich's Model Engine News site and includes photos of finished engines. In partiular, it was the photo of Ken Croft's engine that attracted me, with its British Racing Green anodised parts, so it his engine that I have copied. Two sets of drawings are on the site.The original set, all on one page, are from an article published in the, now defunct, Model Maker magazine of June 1952. The other set of six drawings are CAD and produced by Ron Chernich. It is these drawings that I worked with. When trying to start this engine for the first time, I found the ignition point quite quicklywith a 6"x4" APC nylon prop fitted, but it would not go over TDC whatever I tried. It just bounced back and forward. Reducing compression did not cure it and there were no tight spots. The engine was originally designed for tether car use.The old drawings include a flywheel and I wondered if the timing is set for flywheel use. I therefore changed to a heavier 9"x4" APC nylon prop and it started second flick. The fuel tank holds fuel for a two minute run. In the attached photo of it running it is turning over at 5800 RPM, using Model Technics 1000 fuel. No gaskets have been fitted and there are no leaks, Clean oil is from the exhaust, so everything is where it should be. It is a not a very noisy engine, with a sound very reminiscent of the Mills 1,3 cc
  6. Thanks for reply ,Bob. The mail has totaly vanished from my PC, but I have now found it is still on my phone,so I will be now able to transfer it to myself. Keith
  7. A few days ago I received a free digital copy of the latest Mag from Mortons,in appreciation of being a Forum user. At the time I only quickly looked at it with the intention of reading it more fully later, but it has vanished. Has anyone any knowledge of whether it was a one off occasion,or I have somehow erased it? Keith
  8. Hi Jeff, Photo of the straight through pipe version. Keith.
  9. Hi Jeff, That is interesting information. I have only ever purchased this silencer from new and at the time cannot remember it being listed for size of engine. The centres of the mounting lug was what made me buy this one. I ended up making a multi pipe,straight through , but curved unit, more for directing where the exhaust castor went ,than trying to lower the sound. I have a photo somewhere and will post it later. Keith
  10. Seeing this mention of the Jones .61 made me reach for my note book for when I made one from the Hemmingway kit,6 years ago. A friend had made one a year before and warned me that it was very noisy, as no provision is made for fitting a silencer. To enable me to fit one I altered the size of the exhaust aperture to allow fitting an extention plate with mounting holes for an OS silencer. My notes show that I had a lot of problems with overheating. I was getting top speed of around 10,000 RPM and slow at around 2500RPM,I tried different fuels , changed spacers in the head to try various swish band sizes,etc,but still it would always show signs of overheating. At one run that had some odd results, I found after a check that the main PH bearing had twisted in the housing, having the obvious changes to the timing and fuel intake. I the decided to remove the silencer. My notes say, in capital letters, THIS IS A DIFFERENT ENGINE !. Further testing was therfore carried out without the silencer and the overheating problem stopped Keith.
  11. Hi hillclimber, How is the build of the engine going?
  12. I am in the process of trying to mend an OS 10 with a broken lug, with the same 300c rods Trying out various test pieces before comitting to the actual crankcase, has not been very succesful without the use of a special flux for Ali Soldering. So I can sympathise with your efforts. I am not sure how high I can heat the crankcase safely too. Keith.
  13. That is sensible advice from Jeff2 wings. I would recomend the bar stock designs by Chris Boll. all available on Outerzone. I have made all 5 of them. It seems that the most populer of these is the 1,8 diesel. Keith
  14. Is it not possible to thread and plug the holes? When I have been confronted with trying to line up bad positioned lugs etc. I make a drill jig from ,say, 1/8th" perspecs with the same bore/plug as the casting and then you can eyball the positioning of the holes,rather than work to dimensions and then reverse for the mating part. Keith.
  15. That is a real pain,911 My experience of castings has been very similar, with poor matching of lugs,etc, hence I try to make from bar stock mostly. I think the cause is that these things start out mostly with amateur made patterns, usually with too much taper and not enough machining allowance. Keith.
  16. If you prop is damaged,as you say, do not use it for a running engine as bits might fly off and cause injury. Cut it down to about 2.1/2 inch diameter with square ends and put it on the engine for display purposes. What is the other diesel on the shelf? Does that one run? Keith
  17. Trying an electric motor means of starting it is not a good idear at this stage. You willl be bound to flood it and create an hydraulic lock, which will bend the con rod,at least. The answer is in name of the type, COMPRESSION ignition. If you do not have compression pressure, before TDC, you are wasting prescious fuel. Keith.
  18. You cannot give up after all the fun you have had so far! All you need to do is go back a few posts, hone the cylinder with a taper and make a new piston, honed to a tight fit just above the exhaust port. Wear it in by the process of backwards and forwards rotation, until it goes over TDC, You will then have the compression that is needed. Take a few days off and come back to it with a fresh outlook. Think of the pleasure you will get when it first fires!! Keith.
  19. I am new to posting on this Forum,as I am normaly on the ME Forum, but the recent changes made by Mortons to both, allow us to see both at one visit. Hence I am curious regarding you making several Sparey 5cc Diesels. Are you going into production of them?🙂 I have tended to stay away from castings, as when several are involved, they give problems trying to make them fit together neatly. I am more inclined to make those engines that can be made from bar stock. Keith
  20. Congratulations with the first run Jeff. Takes a lot to beat the sound on the first run of an engine you have made. Keith.
  21. For Brass pads on the gudgeon pin, use 1/16" brass rivets. Keith.
  22. In Ron Chernic's notes with the Hemmingway kit,he uses a 16" wood prop and that is what I use on this engine without problems,with a 4 inch pitch. It is worth noting also that he had backfire problems and found the contra piston was too deep and reduced it by 3/32". Keith.
  23. Thanks for the info on the Castings, You will always get a few thrown props at this stage in finding the starting point. Although I usually make a "pretty" spinner, usually anodised, I do not fit it untill engine has run successfully, due to the probability of it getting damaged when it hits the floor, Until I am happy with it running, I use 2 ordinary nuts,locked against each other. Ref not continuing to run, You have remembered to cut out of the gasket, the small piece over the fuel transfer duct. I hope? I did not and am still red faced over missing it! Keith
  24. Jeff, Are those Sparey castings availble to buy commercialy? Keith.
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